GOST 6709-72
INTERSTATE STANDARD
WATER DISTILLED
TECHNICAL CONDITIONS
Official edition
Standartinform
INTERSTATE STANDARD
DISTILLED WATER Specifications
distilled water. Specifications
MKS 71.040.30 OKP 26 3842 0200 04
Date of introduction 01.01.74
This standard applies to distilled water obtained in distillation apparatus and used for the analysis of chemical reagents and the preparation of reagent solutions.
Distilled water is a clear, colorless, odorless liquid.
Formula: H 2 0.
Molecular weight (according to international atomic masses 1971) - 18.01.
(Revised edition, Rev. No. 1).
1. TECHNICAL REQUIREMENTS
1.1. According to physical and chemical indicators, distilled water must comply with the requirements and standards specified in the table.
Official Edition ★
Reprint prohibited
STANDARTINFORM, 2007 STANDARTINFORM, 2008
Continuation
2. ACCEPTANCE RULES
2.1. Acceptance rules - according to GOST 3885.
2.2. It is allowed for the manufacturer to determine indicators from the 1st to the 12th periodically. The frequency of control is set by the manufacturer.
(Introduced additionally, Amendment No. 2).
3. METHODS OF ANALYSIS
3.1a. General instructions for the analysis - according to GOST 27025.
Weighing using laboratory scales general purpose types VLR-200 g and VLKT-500 g-M or VLE-200 g.
It is allowed to use other measuring instruments with metrological characteristics and equipment with technical specifications not worse, as well as reagents in quality not lower than those specified in this standard.
(Revised edition, Rev. No. 2).
3.1. Samples are taken according to GOST 3885. The volume of the average sample must be at least 5 dm 3 .
(Changed edition, Rev. No. 1, 2).
3.2. (Deleted, Rev. No. 1).
3.3. Determination of the mass concentration of the residue after evaporation
The determination is carried out according to GOST 27026.
To do this, take 500 cm 3 of the analyzed water, measured with a cylinder 2-500 (GOST 1770).
Water is considered to comply with the requirements of this standard if the weight of the dry residue does not exceed 2.5 mg.
(Revised edition, Rev. No. 2).
3.4. (Deleted, Rev. No. 2).
3.5. Determination of mass concentration of ammonia and ammonium salts
(Revised edition, Rev. No. 2).
3.5.1. Reagents, solutions and equipment:
distilled water according to this standard; checked according to clause 3.3;
distilled water, free of ammonia and ammonium salts; prepared as follows: 500 cm 3 of distilled water are placed in a round-bottom flask of a distillation device, 0.5 cm 3 of concentrated sulfuric acid are added, heated to a boil and 400 cm 3 of liquid are distilled off, discarding the first 100 cm 3 of distillate. Water that does not contain ammonia and ammonium salts is stored in a flask closed with a stopper with a "goose" containing a solution of sulfuric acid;
sulfuric acid according to GOST 4204, concentrated and solution 1:3; sodium hydroxide (hydroxide), solution with mass fraction 20% ammonia-free; prepared according to GOST 4517;
Nessler reagent: prepared according to GOST 4517;
a distillation apparatus consisting of a 1000 cm 3 round-bottom flask, a condenser with a splash trap and a receiving flask;
a flat-bottomed tube made of colorless glass with a ground stopper, 20 mm in diameter and 120 cm 3 in capacity;
pipettes 1-1-2-1(2) and 1-2-5(10) according to GOST 29227; cylinder 1(3)-100 and 1-500 according to GOST 1770.
3.5.2. Conducting an analysis
100 cm 3 of the analyzed water is placed in a cylinder in a test tube, 2.5 cm 3 of sodium hydroxide solution are added and mixed. Then add 1 cm 3 of Nessler's reagent and mix again.
Water is considered to meet the requirements of this standard if the color of the analyzed solution observed after 20 minutes along the axis of the test tube is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 100 cm 3 of water that does not contain ammonia and ammonium salts, 0.002 mg NH 4 , 2.5 cm 3 sodium hydroxide solution and 1 cm 3 Nessler's reagent.
3.5.1, 3.5.2. (Changed edition, Rev. No. 1, 2).
3.6. Determination of the mass concentration of nitrates (Changed edition, Rev. No. 2).
3.6.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3; indigo carmine; the solution is prepared according to GOST 10671.2; sulfuric acid according to GOST 4204, chemically pure;
sodium hydroxide according to GOST 4328, chemically pure, concentration solution with (NaOH) = = 0.1 mol / dm 3 (0.1 N), prepared according to GOST 25794.1 without setting the correction factor;
sodium chloride according to GOST 4233, solution with a mass fraction of 0.25%; solution containing NO 3 ; prepared according to GOST 4212; appropriate dilution prepare a solution containing 0.01 mg/cm 3 N0 3 ;
flask Kn-1-50-14/23 THS or Kn-2-50-18 THS according to GOST 25336; pipettes 1-1-2-1 according to GOST 29227 and 6(7)-2-5(10, 25) according to GOST 29169; evaporation cup 2 according to GOST 9147 or bowl 50 according to GOST 19908; cylinder 1(3)-25(50) according to GOST 1770.
3.6.2. Conducting an analysis
25 cm 3 of the analyzed water is placed with a pipette in a cup, 0.05 cm 3 of sodium hydroxide solution is added, mixed and evaporated to dryness according to i.3.3. The cup is immediately removed from the bath, 1 cm 3 of sodium chloride solution, 0.5 cm 3 of indigo carmine solution are added to the dry residue, and 5 cm 3 of sulfuric acid are added carefully with stirring.
After 15 minutes, the contents of the cup are quantitatively transferred into a conical flask, the cup is rinsed in two steps with 25 cm 3 of distilled water, adding it to the main solution, and the contents of the flask are mixed.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution is not weaker than the color of the reference solution prepared as follows: 0.5 cm 3 of a solution containing 0.005 mg of NO 3, 0.05 cm 3 of sodium hydroxide solution is placed in an evaporating cup and evaporated to dryness in a water bath. The cup is immediately removed from the water bath; then the dry residue is treated in the same way simultaneously with the dry residue obtained after evaporation of the analyzed water, adding the same amounts of reagents in the same order.
3.6.1. 3.6.2. (Changed edition, Rev. No. 1, 2).
3.7. Determination of the mass concentration of sulfates (Changed edition, Rev. No. 2).
3.7.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3; barium chloride according to GOST 4108, solution with a mass fraction of 10%; hydrochloric acid according to GOST 3118, concentration solution c (HC1) = 1 mol / dm 3 (1 N), prepared according to GOST 25794.1 without setting the correction factor;
rectified technical ethyl alcohol in accordance with GOST 18300; pipettes 1-1-2-2 and 1-2-2-5(10) according to GOST 29227; glass V-1-50 TC according to GOST 25336; cylinder 1(3)-50 according to GOST 1770.
3.7.2. Conducting an analysis
40 cm 3 of the analyzed water is placed in a cylinder in a glass (with a mark of 10 cm 3) and evaporated on an electric stove to the mark. Then cool, add slowly with stirring 2 cm 3 ethyl alcohol, 1 cm 3 of hydrochloric acid solution and 3 cm 3 of barium chloride solution, previously filtered through an ash-free blue tape filter.
Water is considered to meet the requirements of this standard if the opalescence of the analyzed solution, observed on a dark background after 30 minutes, is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed and containing: 10 cm 3 of the analyzed water containing 0.015 mg SO 4, 2 cm 3 alcohol, 1 cm 3 hydrochloric acid solution and 3 cm 3 barium chloride solution.
3.7.1, 3.7.2. (Changed edition, Rev. No. 1, 2).
3.8. Determination of the mass concentration of chlorides (Changed edition, Rev. No. 2).
3.8.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
nitric acid according to GOST 4461, solutions with a mass fraction of 25 and 1%; prepared according to GOST 4517;
sodium carbonate according to GOST 83, solution with a mass fraction of 1%; silver nitrate according to GOST 1277; solution with a mass fraction of about 1.7%; solution containing C1; prepared according to GOST 4212; appropriate dilution prepare a solution containing 0.001 mg/cm 3 C1; test tube P4-15-14/23 XC according to GOST 25336; pipettes 1-1-2-1 and 1-2-2-5(10) according to GOST 29227; evaporation cup 3 according to GOST 9147 or bowl 100 according to GOST 19908; cylinder 1(3)-50 according to GOST 1770.
3.8.2. Conducting an analysis
50 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup, 0.1 cm 3 of sodium carbonate solution is added and evaporated to dryness according to i.3.3. The residue is dissolved in 3 cm 3 of water, if the solution is cloudy, it is filtered through an ash-free “blue tape” filter, washed with a hot solution of nitric acid with a mass fraction of 1%, and transferred into a test tube. The cup is washed off with 2 cm 3 of water, adding washing water to the solution, adding 0.5 cm 3 of a solution of nitric acid with a mass fraction of 25% and 0.5 cm 3 of a solution of silver nitrate with stirring.
Water is considered to meet the requirements of this standard if the opalescence of the analyzed solution observed after 20 minutes on a dark background is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed and containing in the same volume: 0.001 mg C1, 0.1 cm 3 sodium carbonate solution, 0 .5 cm 3 solution of nitric acid with a mass fraction of 25% and 0.5 cm 3 solution of silver nitrate.
3.8.1. 3.8.2. (Changed edition, Rev. No. 1, 2).
3.9. Determination of the mass concentration of aluminum using stilbazo (Changed edition, Rev. No. 1, 2).
3.9.1. Reagents, solutions and equipment:
distilled water according to this standard, tested according to and. 3.3; ascorbic acid (vitamin C) solution with a mass fraction of 5%, freshly prepared;
acetate buffer pH 5.4; prepared according to GOST 4919.2; hydrochloric acid according to GOST 3118, solution of concentration c (HC1) = = 0.1 mol / dm 3 (0.1 n.); prepared according to GOST 25794.1 without setting the correction factor;
stilbazo, solution with a mass fraction of 0.02%; valid for two months; pipettes 1-1-2-1(2) and 1-2-2-5(10) according to GOST 29227; test tube P4-15-14/23 XC according to GOST 25336;
evaporation cup No. 2 according to GOST 9147 or bowl 40(50) according to GOST 19908; cylinder 1(3)-25(50) according to GOST 1770.
3.9.2. Conducting an analysis
20 cm 3 of the water to be analyzed is placed in a cylinder in an evaporating cup and evaporated to dryness according to i.3.3. 0.25 cm 3 of hydrochloric acid solution is added to the residue, 2.25 cm 3 of water are quantitatively transferred into a test tube, 0.15 cm 3 of ascorbic acid solution, 0.5 cm 3 of stilbazo solution and 5 cm 3 of acetate buffer solution are added with stirring.
Water is considered to meet the requirements of this standard if the color of the analyzed solution after 10 minutes is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg A1, 0.25 cm 3 hydrochloric acid solution, 0.15 cm 3 ascorbic acid solution, 0.5 cm 3 stilbazo solution and 5 cm 3 buffer solution.
3.9.1, 3.9.2. (Changed edition, Rev. No. 1, 2).
3.9a. Determination of the Mass Concentration of Aluminum Using Xylenol Orange
3.9a. 1. Reagents, solutions and equipment:
distilled water according to this standard, tested according to and. 3.3; acetate buffer solution pH 3.4; prepared according to GOST 4919.2; hydrochloric acid according to GOST 3118, chemically pure, concentration solution c (HC1) = = 0.1 mol / dm 3 (0.1 n.); prepared according to GOST 25794.1 without setting the correction factor;
xylenol orange, solution with a mass fraction of 0.1%; prepared according to GOST 4919.1;
flask Kn-1-50-14/23 THS or Kn-2-50-18 THS according to GOST 25336; pipettes 1-1-2-1 and 1-2-2-5(10) according to GOST 29227; evaporation cup No. 3 according to GOST 9147 or bowl 100 according to GOST 19908; cylinder 1(3)-100 according to GOST 1770.
3.9a.2. Conducting an analysis
60 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to i.3.3. The residue is dissolved in 0.25 cm 3 of hydrochloric acid solution, 2 cm 3 of water and quantitatively transferred to 8 cm 3 of water in a conical flask.
Then 10 cm 3 of an acetate buffer solution, 1 cm 3 of a xylenol orange solution are added to the solution, the flask is placed in a water bath (80 °C) for 5 min and cooled.
Water is considered to comply with the requirements of this standard if the pinkish-orange color observed in transmitted light against the background of milk glass in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing 0.003 mg A1, 0.25 cm 3 in the same volume of water hydrochloric acid solution, 10 cm 3 acetate buffer solution and 1 cm 3 xylenol orange solution. 3.9a.-3.9.a.2. (Changed edition, Rev. No. 1, 2).
3.10. Determination of the mass concentration of iron (Changed edition, Rev. No. 2).
3.10.1. Reagents, solutions and equipment:
distilled water according to this standard, tested according to and. 3.3; ammonium persulphate according to GOST 20478, solution with a mass fraction of 5%, freshly prepared;
ammonium thiocyanate according to GOST 27067, a solution with a mass fraction of 30%, purified from iron by extraction with isoamyl alcohol (extraction is carried out after acidifying the solution with a solution of sulfuric acid until the alcohol layer becomes discolored);
sulfuric acid according to GOST 4204, chemically pure, solution with a mass fraction of 20%;
a colorless glass test tube with a ground stopper, 100 cm 3 capacity and 20 mm in diameter;
cylinder 1(3)-50(100) according to GOST 1770.
3.10.2. Conducting an analysis
40 cm 3 of the analyzed water is placed in a cylinder in a test tube, 0.5 cm 3 of sulfuric acid solution, 1 cm 3 of ammonium persulphate solution, 3 cm 3 of ammonium thiocyanate solution are added, mixed, 3.7 cm 3 of isoamyl alcohol are added, mixed thoroughly and incubated until separation of the solution.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 20 cm 3 of analyzed water, 0.001 mg Fe, 0.25 cm 3 of sulfuric acid, 1 cm 3 ammonium persulphate solution, 1.5 cm 3 ammonium thiocyanate solution and 3 cm 3 isoamyl alcohol.
3.10.1. 3.10.2. (Changed edition, Rev. No. 1, 2).
3.11. Determination of the mass concentration of calcium (Changed edition, Rev. No. 2).
3.11.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3; hydrochloric acid according to GOST 3118, solution with a mass fraction of 10%; prepared according to GOST 4517;
murexide (ammonium salt of purple acid), solution with a mass fraction of 0.05%; valid for two days;
sodium hydroxide according to GOST 4328, concentration solution c (NaOH) = = 1 mol / dm 3 (1 N), prepared according to GOST 25794.1 without setting the correction factor;
3.11.2. Conducting an analysis
10 cm 2 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to clause 3.3. The dry residue is treated with 0.2 cm 3 hydrochloric acid solution and quantitatively transferred 5 cm 3 of water into a test tube. Then add 1 cm 3 sodium hydroxide solution, 0.5 cm 3 murexide solution and mix.
Water is considered to comply with the requirements of this standard if the pinkish-violet color of the analyzed solution observed after 5 minutes in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.008 mg of Ca, 0.2 cm 3 of hydrochloric solution acid, 1 cm 3 sodium hydroxide solution and 0.5 cm 3 murexide solution.
3.11.1, 3.11.2. (Changed edition, Rev. No. 1, 2).
3.12. Determination of the mass concentration of copper (Changed edition, Rev. No. 2).
3.12.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3; sodium N, N-diethyldithiocarbamate 3-aqueous according to GOST 8864, solution with a mass fraction of 0.1%; freshly prepared;
hydrochloric acid according to GOST 3118, solution with a mass fraction of 25%; prepared according to GOST 4517;
a test tube made of colorless glass with a ground stopper with a capacity of 100 cm 3 and a diameter of 20 mm or a cylinder 2 (4) -100 according to GOST 1770; pipettes 1-1-2-1(2) and 1-2-2-5(10) according to GOST 29227; cylinder 1(3)-50(100) according to GOST 1770.
3.12.2. Conducting an analysis
50 cm 3 of the analyzed water is placed in a cylinder in a test tube, 1 cm 3 of a hydrochloric acid solution is added, mixed, 3.8 cm 3 of isoamyl alcohol and twice 1 cm 3 of a solution of 3-aqueous N, N-diethyldithiocarbamate sodium are added, stirring immediately after adding each portion of a solution of 3-aqueous N,N-diethyldithiocarbamate sodium for 1 min, and incubated until separation.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 25 cm 3 of the analyzed water, 0.0005 mg Cu, 1 cm 3 acid, 3 cm 3 isoamyl alcohol and 2 cm 3 solution of 3-aqueous N, N-diethyldithiocarbamate sodium.
3.12.1. 3.12.2. (Changed edition, Rev. No. 1, 2).
3.13. Determination of the mass concentration of lead (Changed edition, Rev. No. 2).
3.13.1. Reagents, solutions and equipment:
distilled water according to this standard, tested according to and. 3.3; acetic acid according to GOST 61, chemically pure, solution with a mass fraction of 10%; potassium ferruginous-cyanogen 3-water according to GOST 4207, solution with a mass fraction of 1%, freshly prepared;
sodium tetraborate 10-water according to GOST 4199, concentration solution c (Na 2 B 4 0 7 10H 2 0) \u003d 0.05 mol / dm 3;
sulfarsazen (indicator), the solution is prepared according to GOST 4919.1; pipettes 1-1-2-1(2) and 1-2-2-5(10) according to GOST 29227; test tube P4-15-14/23 XC according to GOST 25336; evaporation cup 2 according to GOST 9147 or bowl 50 according to GOST 19908; cylinder 1(3)-25(50) according to GOST 1770.
3.13.2. Conducting an analysis
20 cm 3 of the water to be analyzed is placed in a cylinder in an evaporating cup
and evaporated to dryness according to clause 3.3. The dry residue is treated with 1 cm 3 solution acetic acid and again evaporated to dryness. Then the cup is cooled, the residue is moistened with 0.1 cm 3 of a solution of acetic acid, quantitatively transferred 3 cm 3 of water into a test tube, 0.2 cm 3 of a solution of potassium ferricyanide, 0.25 cm 3 of a solution of sulfarsazene are added, mixed, 2 cm 3 of a solution of tetraborate are added sodium and mix again.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the test tube in transmitted light on a white background, is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Pb, 0.1 cm 3 acetic acid solution, 0.2 cm 3 solution of potassium ferricyanide, 0.25 cm 3 sulfarsazene solution and 2 cm 3 sodium tetraborate solution.
3.13.1, 3.13.2. (Changed edition, Rev. No. 1, 2).
3.14. Determination of the mass concentration of zinc (Changed edition, Rev. No. 2).
3.14.1. Reagents, solutions and equipment:
distilled water according to this standard, tested according to and. 3.3; aqueous ammonia according to GOST 3760, solution with a mass fraction of 5%, freshly prepared;
tartaric acid according to GOST 5817, solution with a mass fraction of 10%; citric acid monohydrate and anhydrous according to GOST 3652, solution with a mass fraction of 10%;
sulfarsazen, solution with a mass fraction of 0.02%; prepared as follows: 0.02 g of sulfarsazene is dissolved in 100 cm 3 of water and 1-2 drops of ammonia solution are added;
pipettes 1-1-2-1(2) and 1-2-2-5(10) according to GOST 29227; test tube P4-15-14/23 XC according to GOST 25336; evaporating cup 1 according to GOST 9147 or bowl 20 according to GOST 19908; cylinder 1-10 according to GOST 1770 or pipette 1-2-2-5(10) according to GOST 29227; (Changed edition, Rev. No. 1, 2).
3.14.2. Conducting an analysis
5 cm 3 of the water to be analyzed is placed with a cylinder or pipette into an evaporating cup and evaporated to dryness according to clause 3.3. The cup is cooled, the dry residue is transferred quantitatively 3 cm 3 of water into a test tube, 0.8 cm 3 of tartaric acid solution, 0.2 cm 3 of citric acid solution, 0.8 cm 3 of ammonia solution and 0.5 cm 3 of sulfarsazene solution are added with stirring .
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the tube in transmitted light on a white background, is not more intense than the color of the standard solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Zn, 0.8 cm 3 tartaric acid solution, 0.2 cm 3 citric acid solution, 0.8 cm 3 ammonia solution and 0.5 cm 3 sulfarsazene solution.
3.15. Determination of the mass concentration of substances that reduce potassium permanganate
3.14.2, 3.15. (Revised edition, Rev. No. 2).
3.15.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
potassium permanganate according to GOST 20490, concentration solution c (Y 5 KMp0 4) \u003d 0.01 mol / dm 3 (0.01 N), freshly prepared, prepared according to GOST 25794.2;
sulfuric acid according to GOST 4204, a solution with a mass fraction of 20%, prepared according to GOST 4517;
flask Kn-1-500-24/29 THS or Kn-2-500-34 THS according to GOST 25336;
pipettes 1-1-2-1 and 1-2-2-5 according to GOST 29227;
cylinder 1(3)-250 according to GOST 1770.
3.15.2. Conducting an analysis
250 cm 3 of the analyzed water is placed in a cylinder in a flask, 2 cm 3 of a sulfuric acid solution and 0.25 cm 3 of a potassium permanganate solution are added and boiled for 3 minutes.
Water is considered to comply with the requirements of this standard if, when observed in transmitted light against a white background, a pink color is noticeable in the analyzed solution, when compared with an equal volume of the same water, to which the above reagents are not added.
1 cm 3 solution of potassium permanganate concentration exactly c (KMp0 4) = = 0.01 mol / dm 3 corresponds to 0.08 mg of oxygen.
3.15.1, 3.15.2. (Changed edition, Rev. No. 1, 2).
3.16. Determination of the pH of water is carried out on a universal ion meter EV-74 with a glass electrode at 20 °C.
(Revised edition, Rev. No. 2).
3.17. Specific electrical conductivity is determined on a conductometer of any type at 20 °C.
4. STORAGE
4.1. Water is stored in hermetically sealed polyethylene and fluoroplastic bottles or other containers that ensure stable water quality. (Revised edition, Rev. No. 2).
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Chemical Industry of the USSR
2. APPROVED AND INTRODUCED BY Decree of the State Committee for Standards of the Council of Ministers of the USSR dated June 29, 1972 No. 1334
3. REPLACE GOST 6709-53
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
Item number
Item number
GOST 61-75 GOST 83-79 GOST 1277-75 GOST 1770-74
GOST 3118-77
GOST 3652-69 GOST 3760-79 GOST 3885-73 GOST 4108-72 GOST 4199-76 GOST 4204-77
GOST 4207-75 GOST 4212-76
GOST 4233-77 GOST 4328-77 GOST 4461-77 GOST 4517-87
GOST 4919.1-77
3.3.3.5.1.3.6.1.37.1,
3.8.1, 3.9.1, 3.9a.1,
3.10.1.3.11.1.3.12.1,
3.13.1, 3.14.1, 3.15.1
3.7.1, 3.9.1, 3.9a.1,
3.5.1, 3.6.1, 3.10.1,
3.5.1, 3.6.1, 3.7.1,
3.8.1, 3.9.1, 3.9a.1,
3.10.1.3.11.1.3.12.1,
3.5.1, 3.8.1, 3.11.1,
3.12.1, 3.15.1 3.9a.1, 3.13.1
GOST 4919.2-77 GOST 5817-77 GOST 5830-79 GOST 8864-71 GOST 9147-80
Distilled water widely used in various industries (for the manufacture of cosmetics, antifreeze), in chemical laboratories, on chemical industries etc.
Distilled water in the Russian Federation is standardized on the basis of GOST 6709-72.
Physical and chemical indicators of distilled water
according to GOST 6709-72
(excerpts from document)
| Name of indicator | Norm |
| 1. Mass concentration of the residue after evaporation, mg / dm 3 | no more than 5 |
| 2. Mass concentration of ammonia and ammonium salts (NH 4), mg / dm 3 | no more than 0.02 |
| 3. Mass concentration of nitrates (KO 3), mg / dm 3 | no more than 0.2 |
| 4. Mass concentration of sulfates (SO 4), mg / dm 3 | no more than 0.5 |
| 5. Mass concentration of chlorides (Cl), mg / dm 3 | no more than 0.02 |
| 6. Mass concentration of aluminum (Al), mg / dm 3 | no more than 0.05 |
| 7. Mass concentration of iron (Fe), mg / dm 3 | no more than 0.05 |
| 8. Mass concentration of calcium (Ca), mg / dm 3 | no more than 0.8 |
| 9. Mass concentration of copper (Cu), mg / dm 3 | no more than 0.02 |
| 10. Mass concentration of lead (Рb), % | no more than 0.05 |
| 11. Mass concentration of zinc (Zn), mg / dm 3 | no more than 0.2 |
| 12. Mass concentration of substances that reduce KMnO 4 (O), mg / dm 3 | no more than 0.08 |
| 13. Water pH | 5,4 - 6,6 |
| 14. Electrical conductivity at 20°C, Sm/m | no more than 5 10 -4 |
The main indicator controlled when using distilled water is electrical conductivity, which should not exceed 5 µS/cm.
Osmos produces two-stage reverse osmosis systems, which are used in accordance with GOST 6709-72 Distilled water and, according to their purpose, are
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2.5 Requirements for water quality and water treatment
INTERSTATE STANDARD
WATER DISTILLED
TECHNICAL CONDITIONS
Date of introduction 01.01.74
This standard applies to distilled water obtained in distillation apparatus and used for the analysis of chemical reagents and the preparation of reagent solutions.
Distilled water is a clear, colorless, odorless liquid.
Formula: H 2 O.
Molecular weight (according to international atomic masses 1971) - 18.01.
(Revised edition, Rev. No. 1).
1. TECHNICAL REQUIREMENTS
1.1. According to physical and chemical indicators, distilled water must comply with the requirements and standards specified in the table.
|
Name of indicator |
|
|
1. Mass concentration of the residue after evaporation, mg/dm 3 , no more |
|
|
2. Mass concentration of ammonia and ammonium salts (NH 4) mg / dm 3, no more |
|
|
3. Mass concentration of nitrates (NO 3), mg / dm 3, no more |
|
|
4. Mass concentration of sulfates (SO 4), mg / dm 3, no more |
|
|
5. Mass concentration of chlorides (Cl), mg/dm 3 , no more |
|
|
6. Mass concentration of aluminum (Al), mg/dm 3 , no more |
|
|
7. Mass concentration of iron (Fe), mg/dm 3 , no more |
|
|
8. Mass concentration of calcium (Ca), mg/dm 3 , no more |
|
|
9. Mass concentration of copper (Cu), mg/dm 3 , no more |
|
|
10. Mass concentration of lead (Pb), mg/dm 3 , no more |
|
|
11. Mass concentration of zinc (Zn), mg/dm 3 , no more |
|
|
12. Mass concentration of substances that reduce KMnO 4 (O), mg / dm 3, no more |
|
|
14. Electrical conductivity at 20 °C, Sm/m, not more than |
(Revised edition, Rev. No. 2).
2. ACCEPTANCE RULES
2.2. It is allowed for the manufacturer to determine indicators from the 1st to the 12th periodically. The frequency of control is set by the manufacturer.
(Introduced additionally, Amendment No. 2).
3. METHODS OF ANALYSIS
3.1a. General instructions for the analysis - according to GOST 27025.
When weighing, general-purpose laboratory scales of the VLR-200 g and VLKT-500 g-M or VLE-200 g types are used.
It is allowed to use other measuring instruments with metrological characteristics and equipment with technical characteristics not worse, as well as reagents in quality not lower than those specified in this standard.
To do this, take 500 cm 3 of the analyzed water, measured with a cylinder 2-500 (GOST 1770).
Water is considered to comply with the requirements of this standard if the weight of the dry residue does not exceed 2.5 mg.
(Revised edition, Rev. No. 2).
3.4.(Deleted, Rev. No. 2).
3.5. Determination of mass concentration of ammonia and ammonium salts
(Revised edition, Rev. No. 2).
3.5.1. Reagents, solutions and equipment:
distilled water according to this standard; checked according to clause 3.3;
distilled water, free of ammonia and ammonium salts; prepared as follows: 500 cm 3 of distilled water are placed in a round-bottom flask of a distillation device, 0.5 cm 3 of concentrated sulfuric acid are added, heated to a boil and 400 cm 3 of liquid are distilled off, discarding the first 100 cm 3 of distillate. Water that does not contain ammonia and ammonium salts is stored in a flask closed with a stopper with a "goose" containing a solution of sulfuric acid;
Nessler's reagent: prepared according to GOST 4517;
a distillation apparatus consisting of a 1000 cm 3 round-bottom flask, a condenser with a splash trap and a receiving flask;
a flat-bottomed tube made of colorless glass with a ground stopper, 20 mm in diameter and 120 cm 3 in capacity;
3.5.2. Conducting an analysis
100 cm 3 of the analyzed water is placed in a cylinder in a test tube, 2.5 cm 3 of sodium hydroxide solution are added and mixed. Then add 1 cm 3 of Nessler's reagent and mix again.
Water is considered to meet the requirements of this standard if the color of the analyzed solution observed after 20 minutes along the axis of the test tube is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 100 cm 3 of water that does not contain ammonia and ammonium salts, 0.002 mg NH 4 , 2.5 cm 3 sodium hydroxide solution and 1 cm 3 Nessler's reagent.
3.5.1, 3.5.2.
3.6. Determination of mass concentration of nitrates
(Revised edition, Rev. No. 2).
3.6.1. Reagents, solutions and equipment:
indigo carmine; the solution is prepared according to GOST 10671.2;
3.6.2. Conducting an analysis
25 cm 3 of the analyzed water is placed with a pipette in a cup, 0.05 cm 3 of sodium hydroxide solution is added, mixed and evaporated to dryness according to clause 3.3. The cup is immediately removed from the bath, 1 cm 3 of sodium chloride solution, 0.5 cm 3 of indigo carmine solution are added to the dry residue, and 5 cm 3 of sulfuric acid are added carefully with stirring.
After 15 minutes, the contents of the cup are quantitatively transferred into a conical flask, the cup is rinsed in two steps with 25 cm 3 of distilled water, adding it to the main solution, and the contents of the flask are mixed.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution is not weaker than the color of the reference solution prepared as follows: 0.5 cm 3 of a solution containing 0.005 mg of NO 3, 0.05 cm 3 of sodium hydroxide solution is placed in an evaporating cup and evaporated to dryness in a water bath. The cup is immediately removed from the water bath; then the dry residue is treated in the same way simultaneously with the dry residue obtained after evaporation of the analyzed water, adding the same amounts of reagents in the same order.
3.6.1, 3.6.2. (Changed edition, Rev. No. 1, 2).
3.7. Determination of the mass concentration of sulfates
(Revised edition, Rev. No. 2).
3.7.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
3.7.2. Conducting an analysis
40 cm 3 of the analyzed water is placed in a cylinder in a glass (with a mark of 10 cm 3) and evaporated on an electric stove to the mark. Then they are cooled, 2 cm 3 of ethyl alcohol, 1 cm 3 of a hydrochloric acid solution and 3 cm 3 of a barium chloride solution, previously filtered through an ash-free blue tape filter, are added slowly with stirring.
Water is considered to meet the requirements of this standard if the opalescence of the analyzed solution, observed on a dark background after 30 minutes, is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed and containing: 10 cm 3 of the analyzed water containing 0.015 mg SO 4, 2 cm 3 ethyl alcohol, 1 cm 3 hydrochloric acid solution and 3 cm 3 barium chloride solution.
3.7.1, 3.7.2. (Changed edition, Rev. No. 1, 2).
3.8. Determination of the mass concentration of chlorides
(Revised edition, Rev. No. 2).
3.8.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
3.8.2. Conducting an analysis
50 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup, 0.1 cm 3 of sodium carbonate solution is added and evaporated to dryness according to clause 3.3. The residue is dissolved in 3 cm 3 of water, if the solution is cloudy, it is filtered through an ash-free “blue tape” filter, washed with a hot solution of nitric acid with a mass fraction of 1%, and transferred into a test tube. The cup is washed off with 2 cm 3 of water, adding washing water to the solution, adding 0.5 cm 3 of a solution of nitric acid with a mass fraction of 25% and 0.5 cm 3 of a solution of silver nitrate with stirring.
Water is considered to meet the requirements of this standard if the opalescence of the analyzed solution observed after 20 minutes on a dark background is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Cl, 0.1 cm 3 sodium carbonate solution, 0 .5 cm 3 solution of nitric acid with a mass fraction of 25% and 0.5 cm 3 solution of silver nitrate.
3.8.1, 3.8.2. (Changed edition, Rev. No. 1, 2).
3.9. Determination of the mass concentration of aluminum using stilbazo
3.9.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
ascorbic acid (vitamin C); solution with a mass fraction of 5%, freshly prepared;
acetate buffer solution pH 5.4; prepared according to GOST 4919.2;
3.9.2. Conducting an analysis
20 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to paragraph 3.3. 0.25 cm 3 of hydrochloric acid solution is added to the residue, 2.25 cm 3 of water are quantitatively transferred into a test tube, 0.15 cm 3 of ascorbic acid solution, 0.5 cm 3 of stilbazo solution and 5 cm 3 of acetate buffer solution are added with stirring.
Water is considered to meet the requirements of this standard if the color of the analyzed solution after 10 minutes is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Al, 0.25 cm 3 hydrochloric acid solution, 0.15 cm 3 ascorbic acid solution, 0.5 cm 3 stilbazo solution and 5 cm 3 buffer solution.
3.9.1, 3.9.2. (Changed edition, Rev. No. 1, 2).
3.9a. Determination of mass concentration of aluminum using xylenol orange
3.9a.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
acetate buffer solution pH 3.4; prepared according to GOST 4919.2;
flask Kn-1-50-14/23 THS or Kn-2-50-18 THS according to GOST 25336;
3.9a.2. Conducting an analysis
60 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to paragraph 3.3. The residue is dissolved in 0.25 cm 3 of hydrochloric acid solution, 2 cm 3 of water and quantitatively transferred to 8 cm 3 of water in a conical flask.
Then 10 cm 3 of an acetate buffer solution, 1 cm 3 of a xylenol orange solution are added to the solution, the flask is placed in a water bath (80 °C) for 5 min and cooled.
Water is considered to comply with the requirements of this standard if the pinkish-orange color observed in transmitted light against the background of milk glass in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing 0.003 mg Al, 0.25 cm 3 in the same volume of water. hydrochloric acid solution, 10 cm 3 acetate buffer solution and 1 cm 3 xylenol orange solution.
3.9a. - 3.9a.2. (Changed edition, Rev. No. 1, 2).
3.10. Determination of the mass concentration of iron
(Revised edition, Rev. No. 2).
3.10.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
a colorless glass test tube with a ground stopper, 100 cm 3 capacity and 20 mm in diameter;
3.10.2. Conducting an analysis
40 cm 3 of the analyzed water is placed in a cylinder in a test tube, 0.5 cm 3 of sulfuric acid solution, 1 cm 3 of ammonium persulphate solution, 3 cm 3 of ammonium thiocyanate solution are added, mixed, 3.7 cm 3 of isoamyl alcohol are added, mixed thoroughly and incubated until separation of the solution.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 20 cm 3 of analyzed water, 0.001 mg Fe, 0.25 cm 3 of sulfuric acid, 1 cm 3 ammonium persulphate solution, 1.5 cm 3 ammonium thiocyanate solution and 3 cm 3 isoamyl alcohol.
3.10.1, 3.10.2. (Changed edition, Rev. No. 1, 2).
3.11. Determination of the mass concentration of calcium
(Revised edition, Rev. No. 2).
3.11.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
murexide (ammonium salt of purple acid), solution with a mass fraction of 0.05%; valid for two days;
sodium hydroxide (hydroxide) according to GOST 4328, concentration solution With(NaOH) \u003d 1 mol / dm 3 (1 N), prepared according to GOST 25794.1 without setting the correction factor;
3.11.2. Conducting an analysis
10 cm 2 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to paragraph 3.3. The dry residue is treated with 0.2 cm 3 hydrochloric acid solution and quantitatively transferred 5 cm 3 of water into a test tube. Then add 1 cm 3 sodium hydroxide solution, 0.5 cm 3 murexide solution and mix.
Water is considered to meet the requirements of this standard if the pinkish-violet color of the analyzed solution observed after 5 minutes in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.008 mg Ca, 0.2 cm 3 hydrochloric solution acid, 1 cm 3 sodium hydroxide solution and 0.5 cm 3 murexide solution.
3.11.1, 3.11.2. (Changed edition, Rev. No. 1, 2).
3.12. Determination of the mass concentration of copper
(Revised edition, Rev. No. 2).
3.12.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
sodium N, N-diethyldithiocarbamate 3-aqueous according to GOST 8864, solution with a mass fraction of 0.1%; freshly prepared;
a test tube made of colorless glass with a ground stopper with a capacity of 100 cm 3 and a diameter of 20 mm or a cylinder 2 (4) -100 according to GOST 1770;
3.12.2. Conducting an analysis
50 cm 3 of the analyzed water is placed in a cylinder in a test tube, 1 cm 3 of a hydrochloric acid solution is added, mixed, 3.8 cm 3 of isoamyl alcohol and twice 1 cm 3 of a solution of 3-aqueous N, N-diethyldithiocarbamate sodium are added, stirring immediately after the addition of each portions of a solution of 3-aqueous N, N-sodium diethyldithiocarbamate for 1 min, and incubated until separation.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 25 cm 3 of analyzed water, 0.0005 mg Cu, 1 cm 3 of hydrochloric solution acid, 3 cm 3 isoamyl alcohol and 2 cm 3 solution of 3-aqueous N, N-diethyldithiocarbamate sodium.
3.12.1, 3.12.2. (Changed edition, Rev. No. 1, 2).
3.13. Determination of mass concentration of lead
(Revised edition, Rev. No. 2).
3.13.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
3.13.2. Conducting an analysis
20 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to paragraph 3.3. The dry residue is taken up in 1 cm 3 of an acetic acid solution and evaporated to dryness again. Then the cup is cooled, the residue is moistened with 0.1 cm 3 of a solution of acetic acid, quantitatively transferred 3 cm 3 of water into a test tube, 0.2 cm 3 of a solution of potassium ferricyanide, 0.25 cm 3 of a solution of sulfarsazene are added, mixed, 2 cm 3 of a solution of tetraborate are added sodium and mix again.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the test tube in transmitted light on a white background, is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Pb, 0.1 cm 3 acetic acid solution, 0.2 cm 3 solution of potassium ferricyanide, 0.25 cm 3 sulfarsazene solution and 2 cm 3 sodium tetraborate solution.
3.13.1, 3.13.2. (Changed edition, Rev. No. 1, 2).
3.14. Determination of the mass concentration of zinc
(Revised edition, Rev. No. 2).
3.14.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
(Changed edition, Rev. No. 1, 2).
3.14.2. Conducting an analysis
5 cm 3 of the water to be analyzed is placed with a cylinder or pipette into an evaporating cup and evaporated to dryness according to paragraph 3.3. The cup is cooled, the dry residue is transferred quantitatively 3 cm 3 of water into a test tube, 0.8 cm 3 of tartaric acid solution, 0.2 cm 3 of citric acid solution, 0.8 cm 3 of ammonia solution and 0.5 cm 3 of sulfarsazene solution are added with stirring .
STATE STANDARD OF THE UNION OF THE SSR
WATER DISTILLED
TECHNICAL CONDITIONS
GOST 6709-72
IPK STANDARDS PUBLISHING HOUSE
Moscow
STATE STANDARD OF THE UNION OF THE SSR
Introduction date 01.01.74
This standard applies to distilled water obtained in distillation apparatus and used for the analysis of chemical reagents and the preparation of reagent solutions.
Distilled water is a clear, colorless, odorless liquid.
Formula: H 2 O.
Molecular weight (according to international atomic masses 1971) - 18.01.
1.1. According to physical and chemical indicators, distilled water must comply with the requirements and standards specified in the table.
|
Name of indicator |
|
|
1. Mass concentration of the residue after evaporation, mg/dm 3 , no more |
|
|
2. Mass concentration of ammonia and ammonium salts (NH 4), mg / dm 3, no more |
|
|
3. Mass concentration of nitrates (KO 3), mg / dm 3, no more |
|
|
4. Mass concentration of sulfates (SO 4), mg / dm 3, no more |
|
|
5. Mass concentration of chlorides (Сl), mg/dm 3 , no more |
|
|
6. Mass concentration of aluminum (Al), mg / dm 3, no more |
|
|
7. Mass concentration of iron (Fe), mg/dm 3 , no more |
|
|
8. Mass concentration of calcium (Сa), mg/dm 3 , no more |
|
|
9. Mass concentration of copper (Сu), mg/dm 3 , no more |
|
|
10. Mass concentration of lead (Рb), %, no more |
|
|
11. Mass concentration of zinc (Zn), mg/dm 3 , no more |
|
|
12. Mass concentration of substances that reduce KMnO 4 (O), mg / dm 3, no more |
|
|
13. Water pH |
|
|
14. Electrical conductivity at 20 °C, Sm/m, not more than |
2.2. The manufacturer is allowed to determine indicators from 1 to 12 periodically. The frequency of control is set by the manufacturer.
(Introduced additionally, Amendment No. 2).
It is allowed to use other measuring instruments with metrological characteristics and equipment with technical characteristics not worse, as well as reagents in quality not lower than those specified in this standard.
3.1. Samples are taken according to GOST 3885. The volume of the average sample must be at least 5 dm3.
3.1a, 3.1. (Revised edition, Rev. No. 2).
The determination is carried out according to GOST 27026.
To do this, take 500 cm 3 of the analyzed water, measured with a cylinder 2-500 (GOST 1770).
Water is considered to comply with the requirements of this standard if the weight of the dry residue does not exceed 2.5 mg.
(Revised edition, Rev. No. 2).
3.4. (Deleted, Rev. No. 2).
3.5. Determination of the mass concentration of ammonia and ammonium salts
(Revised edition, Rev. No. 2).
distilled water according to this standard; checked according to clause 3.3;
distilled water, free of ammonia and ammonium salts; prepared as follows: 500 cm 3 of distilled water are placed in a round-bottom flask of a distillation device, 0.5 cm 3 of concentrated sulfuric acid are added, heated to a boil and 400 cm 3 of liquid are distilled off, discarding the first 100 cm 3 of distillate. Water that does not contain ammonia and ammonium salts is stored in a flask closed with a stopper with a "goose" containing a solution of sulfuric acid;
sulfuric acid according to GOST 4204, concentrated and solution 1:3;
sodium hydroxide, solution with a mass fraction of 20%, not containing ammonia; prepared according to GOST 4517;
Nessler reagent: prepared according to GOST 4517;
a distillation apparatus consisting of a 1000 cm 3 round-bottom flask, a condenser with a splash trap, and a receiving flask;
a flat-bottomed tube made of colorless glass with a ground stopper, 20 mm in diameter and 120 cm 3 in capacity;
pipette 4(5)-2-1(2) and 6(7)-2-5(10) according to GOST 29169;
cylinder 1(3)-100 and 1-500 according to GOST 1770.
3.5.2 Conducting analysis
100 cm 3 of the analyzed water is placed in a cylinder in a test tube, 2.5 cm 3 of sodium hydroxide solution are added and mixed. Then add 1 cm 3 of Nessler's reagent and mix again.
Water is considered to meet the requirements of this standard if the color of the analyzed solution observed after 20 minutes along the axis of the test tube is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 100 cm 3 of water that does not contain ammonia and ammonium salts, 0.002 mg NH 4 , 2.5 cm 3 sodium hydroxide solution and 1 cm 3 Nessler's reagent.
3.6 Determination of the mass concentration of nitrates
3.5.2,3.6. (Changed edition, Rev. No. 2).
3.3 ;
indigo carmine; the solution is prepared according to GOST 10671.2;
sulfuric acid according to GOST 4204, chemically pure;
sodium hydroxide according to GOST 4328, chemically pure, concentration solution c (NaOH) \u003d 0.l mol / dm 3 (0.1 N), prepared according to GOST 25794.1 without setting the correction factor;
water distilled according to this standard, tested according to clause 3.3;
barium chloride according to GOST 4108, solution with a mass fraction of 10%;
hydrochloric acid according to GOST 3118, concentration solution c (HC1) = 1 mol / dm 3 (1 N), prepared according to GOST 25794.1 without setting the correction factor;
rectified technical ethyl alcohol in accordance with GOST 18300;
pipettes 4(5)-2-2 and 6(7)-2-5(10) according to GOST 29169;
glass V-1-50 TC according to GOST 25336;
cylinder 1(3)-50 according to GOST 1770.
3.7.2 Conducting analysis
40 cm 3 of the analyzed water is placed in a cylinder in a glass (with a mark of 10 cm 3) and evaporated on an electric stove to the mark. Then they are cooled, 2 cm 3 of ethyl alcohol, 1 cm 3 of a hydrochloric acid solution and 3 cm 3 of a barium chloride solution, previously filtered through an ash-free blue tape filter, are added slowly with stirring.
Water is considered to meet the requirements of this standard if the opalescence of the analyzed solution, observed on a dark background after 30 minutes, is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed and containing: 10 cm 3 of the analyzed water containing 0.015 mg SO 4, 2 cm 3 ethyl alcohol, 1 cm 3 hydrochloric acid solution and 3 cm 3 barium chloride solution.
3.7.1, 3.7.2. (Changed edition, Rev. No. 1, 2).
3.8. Determination of the mass concentration of chlorides
water distilled according to this standard, tested according to clause 3.3;
nitric acid according to GOST 4461, solutions with a mass fraction of 25 and 1%; prepared according to GOST 4517;
sodium carbonate according to GOST 83, solution with a mass fraction of 1%;
silver nitrate according to GOST 1277; solution with a mass fraction of about 1.7%;
pipettes 4(5)-2-1 and 6(7)-2-5(10) according to GOST 29169;
evaporation cup 3 according to GOST 9147 or bowl 100 according to GOST 19908;
cylinder 1(3)-50 according to GOST 1770.
3.8.2 Conducting analysis
50 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup, 0.1 cm 3 of sodium carbonate solution is added and evaporated to dryness according to clause 3.3. The residue is dissolved in 3 cm 3 of water, if the solution is cloudy, it is filtered through an ash-free “blue tape” filter, washed with a hot solution of nitric acid with a mass fraction of 1%, and transferred into a test tube. The cup is washed off with 2 cm 3 of water, adding washing water to the solution, adding 0.5 cm 3 of a solution of nitric acid with a mass fraction of 25% and 0.5 cm 3 of a solution of silver nitrate with stirring.
Water is considered to meet the requirements of this standard if the opalescence of the analyzed solution observed after 20 minutes on a dark background is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed and containing in the same volume: 0.001 mg Cl, 0.1 cm 3 sodium carbonate solution, 0 .5 cm 3 solution of nitric acid with a mass fraction of 25% and 0.5 cm 3 solution of silver nitrate.
3.8.1, 3.8.2. (Changed edition, Rev. No. 1, 2).
3.9. Determination of the mass concentration of aluminum using stilbazo
(Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
ascorbic acid (vitamin C) solution with a mass fraction of 5%, freshly prepared;
acetate buffer solution pH 5.4; prepared according to GOST 4919.2;
hydrochloric acid according to GOST 3118, concentration solution c (Hcl) = 0.1 mol / dm 3 (0.1 n.); prepared according to GOST 25794.1 without setting the correction factor;
stilbazo, solution with a mass fraction of 0.02%; valid for two months;
test tube P4-15-14/23 XC according to GOST 25336;
evaporation cup No. 2 according to GOST 9147 or bowl 40(50) according to GOST 19908;
cylinder 1(3)-25(50) according to GOST 1770.
3.9.2 Conducting analysis
3.3. 0.25 cm 3 of hydrochloric acid solution is added to the residue, 2.25 cm 3 of water are quantitatively transferred into a test tube, 0.15 cm 3 of ascorbic acid solution, 0.5 cm 3 of stilbazo solution and 5 cm 3 of acetate buffer solution are added with stirring.
Water is considered to meet the requirements of this standard if the color of the analyzed solution after 10 minutes is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Al, 0.25 cm 3 hydrochloric acid solution, 0.15 cm 3 ascorbic acid solution, 0.5 cm 3 stilbazo solution and 5 cm 3 buffer solution.
3.9.1, 3.9.2. (Changed edition, Rev. No. 1, 2).
3.9a. Determination of mass concentration of aluminum using xylenol orange
3.9a.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
acetate buffer solution pH 3.4; prepared according to GOST 4919.2;
hydrochloric acid according to GOST 3118, chemically pure, concentration solution c (Hcl) = 0.1 mol / dm 3 (0.1 n.); prepared according to GOST 25794.1 without setting the correction factor;
xylenol orange, solution with a mass fraction of 0.1%; prepared according to GOST 4919.1;
flask Kn-1-50-14/23 THS or Kn-2-50-18 THS according to GOST 25336;
evaporation cup No. 3 according to GOST 9147 or bowl 100 according to GOST 19908;
cylinder 1(3)-100 according to GOST 1770.
3.9a.2. Analysis
60 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to clause 3.3. The residue is dissolved in 0.25 cm 3 of hydrochloric acid solution, 2 cm 3 of water and quantitatively transferred to 8 cm 3 of water in a conical flask.
Then 10 cm 3 of an acetate buffer solution, 1 cm 3 of a xylenol orange solution are added to the solution, the flask is placed in a water bath (80 °C) for 5 min and cooled.
Water is considered to comply with the requirements of this standard if the pinkish-orange color observed in transmitted light against the background of milk glass in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing 0.003 mg Al, 0.25 cm 3 in the same volume of water hydrochloric acid solution, 10 cm 3 acetate buffer solution and 1 cm 3 xylenol orange solution.
3.9a.- 3.9a.2. (Changed edition, Rev. No. 1, 2).
3.10. Determination of the mass concentration of iron
(Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
ammonium persulphate according to GOST 20478, solution with a mass fraction of 5%, freshly prepared;
ammonium thiocyanate according to GOST 27067, a solution with a mass fraction of 30%, purified from iron by extraction with isoamyl alcohol (extraction is carried out after acidifying the solution with a solution of sulfuric acid until the alcohol layer becomes discolored);
sulfuric acid according to GOST 4204, chemically pure, solution with a mass fraction of 20%;
a colorless glass test tube with a ground stopper, 100 cm 3 capacity and 20 mm in diameter;
cylinder 1(3)-50(100) according to GOST 1770.
(Changed edition, Rev. No. 1, 2).
3.10.2 Conducting analysis
40 cm 3 of the analyzed water is placed in a cylinder in a test tube, 0.5 cm 3 of sulfuric acid solution, 1 cm 3 of ammonium persulphate solution, 3 cm 3 of ammonium thiocyanate solution are added, mixed, 3.7 cm 3 of isoamyl alcohol are added, mixed thoroughly and incubated until separation of the solution.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 20 cm 3 of analyzed water, 0.001 mg Fe, 0.25 cm 3 of sulfuric acid, 1 cm 3 solution of ammonium persulphate, 1.5 cm 3 - ammonium thiocyanate solution and 3 cm 3 isoamyl alcohol.
3.11. Determination of the mass concentration of calcium
3.10.2,3.11. (Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
hydrochloric acid according to GOST 3118, solution with a mass fraction of 10%; prepared according to GOST 4517;
murexide (ammonium salt of purple acid), solution with a mass fraction of 0.05%; valid for two days;
sodium hydroxide according to GOST 4328, concentration solution c (NaOH) = 1 mol / dm 3 (1 N), prepared according to GOST 25794.1 without setting the correction factor;
test tubes P4-15-14/23 XC according to GOST 25336;
pipettes 4(5)-2-1 and 6(7)-2-5(10) according to GOST 29169;
3.11.2 Conducting analysis
10 cm 2 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to paragraph 3.3. The dry residue is treated with 0.2 cm 3 hydrochloric acid solution and quantitatively transferred 5 cm 3 of water into a test tube. Then add 1 cm 3 sodium hydroxide solution, 0.5 cm 3 murexide solution and mix.
Water is considered to meet the requirements of this standard if the pinkish-violet color of the analyzed solution observed after 5 minutes in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.008 mg Ca, 0.2 cm 3 hydrochloric solution acid, 1 cm 3 sodium hydroxide solution and 0.5 cm 3 murexide solution.
3.11.1, 3.11.2. (Changed edition, Rev. No. 1, 2).
3.12 Determination of the mass concentration of copper
(Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
sodium N, N-diethyldithiocarbamate 3-aqueous according to GOST 8864, solution with a mass fraction of 0.1%; freshly prepared;
hydrochloric acid according to GOST 3118, solution with a mass fraction of 25%; prepared according to GOST 4517;
isoamyl alcohol according to GOST 5830;
a test tube made of colorless glass with a ground stopper with a capacity of 100 cm 3 and a diameter of 20 mm or a cylinder 2 (4) -100 according to GOST 1770;
pipette 4(5)-2-1(2) and 6(7)-2-5(10) according to GOST 29169;
cylinder 1(3)-50(100) according to GOST 1770.
(Changed edition, Rev. No. 1, 2).
3.12.2 Conducting analysis
50 cm 3 of the analyzed water is placed in a cylinder in a test tube, 1 cm 3 of a hydrochloric acid solution is added, mixed, 3.8 cm 3 of isoamyl alcohol and twice 1 cm 3 of a solution of 3-aqueous N, N-diethyldithiocarbamate sodium are added, stirring immediately after the addition of each portions of a solution of 3-aqueous N, N-sodium diethyldithiocarbamate for 1 min and incubated until separation.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 25 cm 3 of analyzed water, 0.0005 mg Cu, 1 cm 3 of hydrochloric solution acid, 3 cm 3 isoamyl alcohol and 2 cm 3 solution of 3-aqueous N, N-diethyldithiocarbamate sodium.
3.13. Determination of the mass concentration of lead
3.12.2,3.13. (Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
acetic acid according to GOST 61, chemically pure, solution with a mass fraction of 10%;
potassium ferruginous cyanide 3-water according to GOST 4207, solution with a mass fraction of 1%, freshly prepared;
sodium tetraborate 10-water according to GOST 4199, concentration solution c (Na 2 B 4 O 7 10H 2 O) = 0.05 mol / dm 3;
sulfarsazen (indicator), the solution is prepared according to GOST 4919.1;
pipettes 4(5)-2-1(2) and 6(7)-2-5(10) according to GOST 29169;
test tube P4-15-14/23 XC according to GOST 25336;
evaporation cup 2 according to GOST 9147 or bowl 50 according to GOST 19908;
cylinder 1(3)-25(50) according to GOST 1770.
3.13.2 Conducting analysis
20 cm 3 of the analyzed water is placed in a cylinder in an evaporating cup and evaporated to dryness according to paragraph 3.3. The dry residue is taken up in 1 cm 3 of an acetic acid solution and evaporated to dryness again. Then the cup is cooled, the residue is moistened with 0.1 cm 3 of a solution of acetic acid, quantitatively transferred 3 cm 3 of water into a test tube, 0.2 cm 3 of a solution of potassium ferricyanide, 0.25 cm 3 of a solution of sulfarsazene are added, mixed, 2 cm 3 of a solution of tetraborate are added sodium and mix again.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the test tube in transmitted light on a white background, is not more intense than the color of the reference solution prepared simultaneously with the analyzed and containing in the same volume: 0.001 mg Pb, 0.1 cm 3 solution acetic acid, 0.2 cm 3 of a solution of potassium ferricyanide, 0.25 cm 3 of a solution of sulfarsazene and 2 cm 3 of a solution of sodium tetraborate.
3.13.1, 3.13.2. (Changed edition, Rev. No. 1, 2).
3.14. Determination of the mass and concentration of zinc
(Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
aqueous ammonia according to GOST 3760, solution with a mass fraction of 5%, freshly prepared;
tartaric acid according to GOST 5817, solution with a mass fraction of 10%;
citric acid monohydrate and anhydrous according to GOST 3652, solution with a mass fraction of 10%;
sulfarsazen, solution with a mass fraction of 0.02%; prepared as follows: 0.02 g of sulfarsazene is dissolved in 100 cm 3 of water and 1-2 drops of ammonia solution are added;
pipettes 4(5)-2-1(2) and 6(7)-2-5(10) according to GOST 29169;
test tube P4-15-14/23 XC according to GOST 25336;
evaporating cup 1 according to GOST 9147 or bowl 20 according to GOST 19908;
cylinder 1-10 according to GOST 1770 or pipette 6(7)-2-5(10) according to GOST 29169.
(Changed edition, Rev. No. 1, 2).
3.14.2 Conducting analysis
5 cm 3 of the analyzed water is placed with a cylinder or pipette in an evaporating cup and evaporated to dryness according to paragraph 3.3. The cup is cooled, the dry residue is transferred quantitatively 3 cm 3 of water into a test tube, 0.8 cm 3 of tartaric acid solution, 0.2 cm 3 of citric acid solution, 0.8 cm 3 of ammonia solution and 0.5 cm 3 of sulfarsazene solution are added with stirring .
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the test tube, in transmitted light on a white background is not more intense than the color of the standard solution, prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Zn, 0.8 cm 3 tartaric acid solution, 0.2 cm 3 citric acid solution, 0.8 cm 3 ammonia solution and 0.5 cm 3 sulfarsazene solution.
3.15. Determination of the mass concentration of substances that reduce potassium permanganate
3.14.2,3.15. (Revised edition, Rev. No. 2).
water distilled according to this standard, tested according to clause 3.3;
potassium permanganate according to GOST 20490, concentration solution c (1/5 KMnO 4) = 0.01 mol / dm 3 (0.01 N), freshly prepared, prepared according to GOST 25794.2;
sulfuric acid according to GOST 4204, a solution with a mass fraction of 20%, prepared according to GOST 4517;
flask Kn-1-500-24/29 THS or Kn-2-500-34 THS according to GOST 25336;
pipettes 4(5)-2-1 and 6(7)-2-5 according to GOST 29169;
cylinder 1(3)-250 according to GOST 1770.
3.15.2. Conducting an analysis
250 cm 3 of the analyzed water is placed in a cylinder in a flask, 2 cm 3 of a sulfuric acid solution and 0.25 cm 3 of a potassium permanganate solution are added and boiled for 3 minutes.
Water is considered to comply with the requirements of this standard if, when observed in transmitted light against a white background, a pink color is noticeable in the analyzed solution, when compared with an equal volume of the same water, to which the above reagents are not added.
1 cm 3 solution of potassium permanganate, concentration exactly c (KMnO 4) \u003d 0.01 mol / dm 3 corresponds to 0.08 mg of oxygen.
3.15.1, 3.15.2. (Changed edition, Rev. No. 1, 2).
3.16. The determination of the pH of water is carried out on a universal ion meter EV-74 with a glass electrode at 20 °C.
(Revised edition, Rev. No. 2).
3.17. The specific electrical conductivity is determined on a conductometer of any type at 20 °C.
4.1. Water is stored in hermetically sealed polyethylene and fluoroplastic bottles or other containers that ensure stable water quality.
(Revised edition, Rev. No. 2).
INFORMATION DATA
1. DESIGNED AND INTRODUCED by the Ministry chemical industry USSR
DEVELOPERS
R.P. Lastovsky, V.G. Brudz, I.L. Rotenberg, E.N. Yakovleva, Z.M. Rivina, V.A. Rakovskaya, L.V. Kidiyarova, T.M. Sas
2. APPROVED AND INTRODUCED BY Decree State Committee standards of the Council of Ministers of the USSR dated 29.06.72 No. 1334
3. REPLACE GOST 6709-53
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
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Item number |
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GOST 4212-76 |
3.6.2. Conducting an analysis
25 cm3 of analyzed water is placed with a pipette in a cup, 0.05 cm3 of sodium hydroxide solution is added, mixed and evaporated to dryness according to clause 3.3. The cup is immediately removed from the bath, 1 ml of sodium chloride solution, 0.5 ml of indigo carmine solution are added to the dry residue, and 5 ml of sulfuric acid are added carefully with stirring.
After 15 minutes, the contents of the cup are quantitatively transferred to a conical flask, the cup is rinsed in two steps with 25 ml of distilled water, adding it to the stock solution, and the contents of the flask are stirred.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution is not weaker than the color of the reference solution prepared as follows: 0.5 ml of a solution containing 0.005 mg of NO, 0.05 ml of sodium hydroxide solution is placed in an evaporating dish and evaporated to dryness in a water bath . The cup is immediately removed from the water bath; then the dry residue is treated in the same way simultaneously with the dry residue obtained after evaporation of the analyzed water, adding the same amounts of reagents in the same order.
3.6.1, 3.6.2.
3.7. Determination of the mass concentration of sulfates
3.7.1. Reagents, solutions and equipment:
barium chloride according to GOST 4108, solution with a mass fraction of 10%;
hydrochloric acid according to GOST 3118, concentration solution (HCl) = 1 mol / dm (1 N), prepared according to GOST 25794.1
solution containing SO; prepared according to GOST 4212 on the analyzed water by appropriate dilution of the main solution with the same water, a solution with a SO concentration of 0.01 mg/cm is obtained;
rectified technical ethyl alcohol in accordance with GOST 18300;
pipettes 1-1-2-2 and 1-2-2-5(10) according to GOST 29227;
glass V-1-50 TC according to GOST 25336;
cylinder 1(3)-50 according to GOST 1770.
3.7.2. Conducting an analysis
40 cm3 of analyzed water is placed in a cylinder into a beaker (with a mark of 10 cm) and evaporated on an electric stove to the mark. Then cool, add slowly with stirring 2 cm3 of ethyl alcohol, 1 cm3 of hydrochloric acid solution and 3 cm3 of barium chloride solution, previously filtered through an ash-free "blue tape" filter.
Water is considered to comply with the requirements of this standard if the opalescence of the analyzed solution, observed on a dark background after 30 minutes, is not more intense than the opalescence of the reference solution, prepared simultaneously with the analyzed one and containing: cm solution of hydrochloric acid and 3 cm solution of barium chloride.
3.7.1, 3.7.2. (Changed edition, Rev. N 1, 2).
3.8. Determination of the mass concentration of chlorides
(Changed edition, Rev. N 2).
3.8.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
nitric acid according to GOST 4461, solutions with a mass fraction of 25 and 1%; prepared according to GOST 4517;
sodium carbonate according to GOST 83, solution with a mass fraction of 1%;
silver nitrate according to GOST 1277; solution with a mass fraction of about 1.7%;
solution containing Cl; prepared according to GOST 4212; appropriate dilution prepare a solution containing 0.001 mg/cm Cl;
test tube P4-15-14/23 XC according to GOST 25336;
GOST 29227;
evaporating cup 3 according to GOST 9147 or bowl 100 according to GOST 19908;
cylinder 1(3)-50 according to GOST 1770.
3.8.2. Conducting an analysis
50 cm3 of water to be analyzed is placed in a cylinder in an evaporating cup, 0.1 cm3 of sodium carbonate solution is added and evaporated to dryness according to clause 3.3. The residue is dissolved in 3 cm of water, if the solution is cloudy, it is filtered through an ash-free "blue tape" filter, washed with a hot solution of nitric acid with a mass fraction of 1%, and transferred into a test tube. The cup is washed off with 2 cm of water, adding washing water to the solution, 0.5 cm of nitric acid solution with a mass fraction of 25% and 0.5 cm of silver nitrate solution are added with stirring.
Water is considered to comply with the requirements of this standard if the opalescence of the analyzed solution observed after 20 minutes on a dark background is not more intense than the opalescence of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Cl, 0.1 cm3 of sodium carbonate solution, 0. 5 cm nitric acid solution with a mass fraction of 25% and 0.5 cm solution of silver nitrate.
3.8.1, 3.8.2. (Changed edition, Rev. N 1, 2).
3.9. Determination of the mass concentration of aluminum using stilbazo
(Changed edition, Rev. N 1, 2).
3.9.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
ascorbic acid (vitamin C); solution with a mass fraction of 5%, freshly prepared;
acetate buffer solution pH 5.4; prepared according to GOST 4919.2;
hydrochloric acid according to GOST 3118, concentration solution
GOST 25794.1 without setting the correction factor;
GOST 4212
stilbazo, solution with a mass fraction of 0.02%; valid for two months;
GOST 29227;
test tube P4-15-14/23 XC according to GOST 25336;
evaporating cup N 2 in accordance with GOST 9147 or bowl 40 (50) in accordance with GOST 19908;
cylinder 1(3)-25(50) according to GOST 1770.
3.9.2. Conducting an analysis
20 cm3 of water to be analyzed is placed in a cylinder in an evaporating cup and evaporated to dryness according to clause 3.3. 0.25 ml of hydrochloric acid solution is added to the residue, 2.25 ml of water is quantitatively transferred into a test tube, 0.15 ml of ascorbic acid solution, 0.5 ml of stilbazo solution and 5 ml of acetate buffer solution are added with stirring.
Water is considered to meet the requirements of this standard if the color of the analyzed solution after 10 minutes is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg of Al, 0.25 ml of hydrochloric acid solution, 0.15 ml of ascorbic acid solution acid, 0.5 ml of stilbazo solution and 5 ml of buffer solution.
3.9.1, 3.9.2. (Changed edition, Rev. N 1, 2).
3.9a. Determination of mass concentration of aluminum using xylenol orange
3.9a.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
acetate buffer solution pH 3.4; prepared according to GOST 4919.2;
hydrochloric acid according to GOST 3118, chemically pure, concentration solution
(HCl)=0.1 mol/dm (0.1 N); prepared according to GOST 25794.1 without setting the correction factor;
xylenol orange, solution with a mass fraction of 0.1%; prepared according to GOST 4919.1;
solution containing Al; prepared according to GOST 4212; appropriate dilution prepare a solution containing 0.001 mg/cm Al;
flask Kn-1-50-14/23 THS or Kn-2-50-18 THS according to GOST 25336;
pipettes 1-1-2-1 and 1-2-2-5(10) according to GOST 29227;
evaporating cup N 3 in accordance with GOST 9147 or bowl 100 in accordance with GOST 19908;
cylinder 1(3)-100 according to GOST 1770.
3.9a.2. Conducting an analysis
60 cm3 of water to be analyzed is placed in a cylinder in an evaporating cup and evaporated to dryness according to clause 3.3. The residue is dissolved in 0.25 ml of hydrochloric acid solution, 2 ml of water and quantitatively transferred to 8 ml of water in a conical flask.
Then 10 ml of acetate buffer solution, 1 ml of xylenol orange solution are added to the solution, the flask is placed in a water bath (80 °C) for 5 min and cooled.
Water is considered to comply with the requirements of this standard if the pinkish-orange color observed in transmitted light against the background of milk glass in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing 0.003 mg Al, 0.25 cm3 of solution in the same volume of water. hydrochloric acid, 10 ml of acetate buffer solution and 1 ml of xylenol orange solution.
3.9a.-3.9a.2. (Changed edition, Rev. N 1, 2).
3.10. Determination of the mass concentration of iron
(Changed edition, Rev. N 2).
3.10.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
ammonium persulphate according to GOST 20478, solution with a mass fraction of 5%, freshly prepared;
ammonium thiocyanate according to GOST 27067, a solution with a mass fraction of 30%, purified from iron by extraction with isoamyl alcohol (extraction is carried out after acidifying the solution with a solution of sulfuric acid until the alcohol layer becomes discolored);
sulfuric acid according to GOST 4204, chemically pure, solution with a mass fraction of 20%;
a solution containing Fe; prepared according to GOST 4212; an appropriate dilution prepares a solution containing 0.001 mg/cm Fe;
isoamyl alcohol according to GOST 5830;
pipettes 1-1-2-1(2) and 1-2-2-5(10) according to GOST 29227;
a colorless glass test tube with a ground stopper, 100 cm3 in capacity and 20 mm in diameter;
cylinder 1(3)-50(100) according to GOST 1770.
3.10.2. Conducting an analysis
40 ml of analyzed water is placed in a cylinder in a test tube, 0.5 ml of sulfuric acid solution, 1 ml of ammonium persulphate solution, 3 ml of ammonium thiocyanate solution are added, mixed, 3.7 ml of isoamyl alcohol is added, mixed thoroughly and kept until the solution separates.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution, prepared simultaneously with the analyzed one in the same way and containing: 20 cm3 of water to be analyzed, 0.001 mg Fe, 0.25 cm 1 ml of ammonium persulphate solution, 1.5 ml of ammonium thiocyanate solution and 3 ml of isoamyl alcohol.
3.10.1, 3.10.2. (Changed edition, Rev. N 1, 2).
3.11. Determination of the mass concentration of calcium
(Changed edition, Rev. N 2).
3.11.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
hydrochloric acid according to GOST 3118, solution with a mass fraction of 10%; prepared according to GOST 4517;
murexide (ammonium salt of purple acid), solution with a mass fraction of 0.05%; valid for two days;
sodium hydroxide according to GOST 4328, concentration solution
(NaOH)=1 mol/dm (1 N), prepared according to GOST 25794.1 without setting the correction factor;
a solution containing Ca; prepared according to GOST 4212; an appropriate dilution prepares a solution containing 0.01 mg/cm Ca;
test tubes P4-15-14/23 XC according to GOST 25336;
pipettes 1-1-2-1 and 1-2-2-5(10) according to GOST 29169, GOST 29227;
evaporating cup 1 according to GOST 9147 or bowl 20 according to GOST 19908;
cylinder 1(3)-25(50) according to GOST 1770.
3.11.2. Conducting an analysis
10 cm3 of water to be analyzed is placed in a cylinder in an evaporating cup and evaporated to dryness according to clause 3.3. The dry residue is treated with 0.2 ml of hydrochloric acid solution and quantitatively transferred to 5 ml of water in a test tube. Then add 1 ml of sodium hydroxide solution, 0.5 ml of murexide solution and mix.
________________
* The text of the document corresponds to the original. - Database manufacturer's note.
Water is considered to comply with the requirements of this standard if the pinkish-violet color of the analyzed solution observed after 5 minutes in pink is not more intense than the color of the reference solution prepared simultaneously with the analyzed one and containing in the same volume: 0.008 mg of Ca, 0.2 cm 3 of hydrochloric acid solution , 1 ml of sodium hydroxide solution and 0.5 ml of murexide solution.
3.11.1, 3.11.2. (Changed edition, Rev. N 1, 2).
3.12. Determination of the mass concentration of copper
(Changed edition, Rev. N 2).
3.12.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
sodium N, N-diethyldithiocarbamate 3-aqueous and 20 mm in diameter or a cylinder 2(4)-100 by isoamyl alcohol and twice 1 cm solution of 3-aqueous N, N-diethyldithiocarbamate sodium, stirring immediately after adding each portion of the solution of 3- aqueous N,N-diethyldithiocarbamate sodium for 1 min, and incubated until separation.
Water is considered to comply with the requirements of this standard if the observed color of the alcohol layer of the analyzed solution is not more intense than the color of the alcohol layer of the reference solution prepared simultaneously with the analyzed one in the same way and containing: 3 ml of isoamyl alcohol and 2 ml of a solution of 3-aqueous N,N-diethyldithiocarbamate sodium.
3.12.1, 3.12.2. (Changed edition, Rev. N 1, 2).
3.13. Determination of mass concentration of lead
(Changed edition, Rev. N 2).
3.13.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
acetic acid according to GOST 61, chemically pure, solution with a mass fraction of 10%;
potassium ferric-cyanogen 3-aqueous according to O) \u003d 0.05 mol / dmGOST 9147 or bowl 50 according to GOST 19908;
cylinder 1(3)-25(50) according to GOST 1770.
3.13.2. Conducting an analysis
20 cm3 of water to be analyzed is placed in a cylinder in an evaporating cup and evaporated to dryness according to clause 3.3. The dry residue is treated with 1 ml of acetic acid solution and again evaporated to dryness. Then the cup is cooled, the residue is moistened with 0.1 ml of acetic acid solution, quantitatively transferred 3 ml of water into a test tube, 0.2 ml of potassium ferricyanide solution, 0.25 ml of sulfarsazene solution are added, mixed, 2 ml of sodium tetraborate solution are added and mixed again.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the tube in transmitted light on a white background, is not more intense than the color of the reference solution prepared simultaneously with the analyzed and containing in the same volume: 0.001 mg Pb, 0.1 cm solution acetic acid, 0.2 ml of potassium ferricyanide solution, 0.25 ml of sulfarsazene solution and 2 ml of sodium tetraborate solution.
3.13.1, 3.13.2. (Changed edition, Rev. N 1, 2).
3.14. Determination of the mass concentration of zinc
(Changed edition, Rev. N 2).
3.14.1. Reagents, solutions and apparatus: GOST 1770 or pipette 1-2-2-5(10) according to GOST 29227.
(Changed edition, Rev. N 1, 2).
3.14.2. Conducting an analysis
5 cm3 of water to be analyzed is placed with a cylinder or pipette into an evaporating cup and evaporated to dryness according to clause 3.3. The cup is cooled, the dry residue is quantitatively transferred to 3 ml of water in a test tube, 0.8 ml of tartaric acid solution, 0.2 ml of citric acid solution, 0.8 ml of ammonia solution and 0.5 ml of sulfarsazene solution are added with stirring.
Water is considered to comply with the requirements of this standard if the color of the analyzed solution, observed along the axis of the tube in transmitted light on a white background, is not more intense than the color of the standard solution prepared simultaneously with the analyzed one and containing in the same volume: 0.001 mg Zn, 0.8 cm3 of solution tartaric acid, 0.2 ml of citric acid solution, 0.8 ml of ammonia solution and 0.5 ml of sulfarsazene solution.
3.15. Determination of the mass concentration of substances that reduce potassium permanganate
3.14.2, 3.15. (Changed edition, Rev. N 2).
3.15.1. Reagents, solutions and equipment:
water distilled according to this standard, tested according to clause 3.3;
potassium permanganate according to GOST 20490, concentration solution, solution with a mass fraction of 20%, prepared according to a solution of potassium permanganate and boiled for 3 minutes.
Water is considered to comply with the requirements of this standard if, when observed in transmitted light against a white background, a pink color is noticeable in the analyzed solution, when compared with an equal volume of the same water, to which the above reagents are not added.
1 cm solution of potassium permanganate concentration exactly (KMnO) = 0.01 mol / dm corresponds to 0.08 mg of oxygen.
3.15.1, 3.15.2. (Changed edition, Rev. N 1, 2).
3.16. The determination of the pH of water is carried out on a universal ion meter EV-74 with a glass electrode at 20 °C.
(Changed edition, Rev. N 2).
3.17. Specific electrical conductivity is determined on a conductometer of any type at 20 °C.
4. STORAGE
4.1. Water is stored in hermetically sealed polyethylene and fluoroplastic bottles or other containers that ensure stable water quality.
(Changed edition, Rev. N 2).
Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
Water quality control:
Sat. GOSTs. - M.: FSUE
"STANDARTINFORM", 2010
