This standard specifies the maximum permissible concentration of hydrazine in drinking water sources and the monitoring and testing methods. This standard applies to drinking water sources from rivers, lakes, reservoirs, ponds (wells). GB 18061-2000 Hydrazine Hydrazine Hydration Standard for Source Water GB18061-2000 Standard download decompression password: www.bzxz.net

GB18061—2000
All technical contents of this standard are mandatory. Foreword
In order to implement the "Environmental Protection Law of the People's Republic of China" and the "Water Pollution Prevention and Control Law of the People's Republic of China", prevent and control the pollution of the water environment by aerospace industrial waste, and protect the health of the general public, this standard is formulated based on the principles of formulating water source water hygiene standards, with reference to foreign research results, and based on the actual situation in my country.
This standard will be implemented from January 1, 2001. This standard is proposed by the Ministry of Health of the People's Republic of China and the Ministry of Aerospace Industry. Appendix A of this standard is the appendix of the standard.
The responsible drafting unit of this standard is the Seventh Design Institute of the Ministry of Aerospace Industry; participating units: the Academy of Military Medical Sciences of the Chinese People's Liberation Army and the Monitoring Station of the Shanghai Aerospace Administration. bzxZ.net
The main drafters of this standard are Xu Zhitong, Zheng Zhiqiao, Zheng Jun, and Yu Lanshu. This standard is entrusted by the Ministry of Health to the Institute of Environmental Health Monitoring of the Chinese Academy of Preventive Medicine. Explanation 198
National Standard of the People's Republic of China
Hygienic standard for hydrazine in water sources
Hygienic standard for hydrazine in water sources This standard specifies the maximum allowable concentration of hydrazine in drinking water sources and the monitoring and inspection methods. This standard is applicable to water sources that use rivers, lakes, reservoirs, and ponds (and) as drinking water. 2 Standard content
The maximum allowable concentration of hydrazine in drinking water sources is 0.02mg/1.3 Detection method
This standard uses the p-dimethylaminobenzaldehyde spectrophotometric method to detect hydrazine in water, see Appendix A. Approved by the State Administration of Quality and Technical Supervision on April 10, 2000, GB18061-2000. Implemented on January 1, 2001. A1 Method Summary GB 18061—2000 Appendix A (Standard Appendix) Determination in Water Spectrophotometric Method for p-Dimethylaminobenzaldehyde Trace hydrazine in water reacts with p-dimethylaminobenzaldehyde-ethanol solution in sulfuric acid medium to form a yellow azine compound. The yellow depth is proportional to the hydrazine content within the determination range. In accordance with the Lambert-Beer law, the maximum absorption wavelength of the yellow complex is 4158nm. Unsymmetrical dimethylhydrazine, nitrate, nitrogen and fluorine in water have no interference with this method. The interference of monomethylhydrazine within 3 times of the hydrazine content can be ignored. Determination range: 0.002~0.30mg/L. Hydrazine above 0.30mg/L can be diluted and determined according to this method. A2 Instruments and apparatus
A2. 1 Spectrophotometer: equipped with 1cm optical path and 5cm colorimetric III. A2.2 Volumetric flask: 1000mL, 4 pcs; 500mL, 2 pcs; 50mL, 16!. A2.3 Brown volumetric flask: 500ml. 2 pcs.
A2.4 Graduated pipette: 10mL, 3 pcs; 5mL, 3 pcs; 1mL, 2 pcs. A2. 5 Acid burette: 50ml., 1 pc; 15mL, 1 pc. A3 Reagents
A3.1 p-Dimethylaminobenzaldehyde: analytical grade. A3.2 Sulfuric acid: analytical grade.
43.3 Ethanol: analytical grade, content 95%.
A3.4 Sulfuric acid: analytical grade.
A3.5 Sulfuric acid: c(1/2 H,S0,) = 0.5 mol/L. Add 500 mL of distilled water to a 1 000 mL volumetric flask, slowly inject 13.9 mL of concentrated sulfuric acid, dilute to the mark with distilled water and shake.
A3.6 Sulfuric acid: c(1/2H,SO,) = 1.0 mol/L. Add 500 mL of distilled water to a 1 000 mL volumetric flask, slowly inject 27.8 mL of concentrated sulfuric acid, dilute to the mark with distilled water and shake.
A3.7 Sulfuric acid: c(1/2H,SO,) = 9.0 mol/L. Add 500 mL of distilled water to a 1000 mL volumetric flask, slowly inject 250 mL of concentrated sulfuric acid, dilute to the mark with distilled water and shake well. A3.8 Color developer: p-dimethylamino violet formaldehyde-ethanol solution. Weigh 2.0g p-dimethylaminobenzaldehyde into a 250mL brown volumetric flask, add 100mL ethanol, slowly inject 10mL 9 mol/L sulfuric acid, and shake well.
A3.9 Joint standard stock solution.
Accurately weigh 4.066g sulfuric acid, dissolve it in 0.5 mol/L sulfuric acid solution, transfer it into a 1000mL volumetric flask, dilute it to the scale with 0.5 mol/L sulfuric acid, and shake well. This solution contains 1000μg hydrazine in 1ml: A3.10 Hydrazine standard working solution
GB 18061—2000
Pipette 1mL of standard stock solution into a 1000mL volumetric flask, dilute it to the scale with 0.5ma1/L sulfuric acid, and shake well. This solution contains 1ml! .
A4 Analysis steps
A4.1 Drawing of standard curve
A4.1.1 Drawing of hydrazine standard curve when methyl hydrazine and unsymmetrical dimethylhydrazine are not present in the water sample Take 8 50ml volumetric flasks and add 0.0.0.100.20.0.40, 0.50, 1.00, 1.50, 2.00mL of hydrazine standard working solution in turn, then add 10mL of mol/L sulfuric acid to each volumetric flask, add distilled water to make the total volume about 43ml, add 5mL of color developer, and then dilute to the scale with distilled water, shake well, and let it stand for 15~30min. Use a 5cm optical path cuvette with distilled water as a reference, measure the absorbance at a wavelength of 458nm, subtract the absorbance of the blank solution to get the net absorbance of each solution, draw the absorbance curve of the mass (g) of hydrazine contained in the solution on the coordinate paper, and find the regression equation.
A4.1.2 Plotting the standard curve when mono-III hydrazine and unsymmetrical dimethylhydrazine are present in the water sample Take 8 50mL volumetric flasks and add 0.00, 0.20, 0.40, 0.50, 1.00, 1.50.2.00mL of the standard working solution, add 30mL of 1mol/L sulfuric acid, add distilled water to a volume of about 43mL. Then add 5mL of the color developer, and then dilute to the scale with distilled water. Mix well, let stand for 15~30 minutes, and plot the curve according to the method of A4.1.1. A4.2 Sample analysis
A4.2.1 Sampling
Water samples are collected in glass bottles. After collection, add acid or alkali to adjust pH to neutral and measure as soon as possible. A4.2.2 Sample pretreatment
A4.2.2.1 When monomethyl and dimethyl are not present in the water sample, take about 400mL of the neutral water sample of A4.2.1 and place it in a clean, dry 500mL volumetric flask, slowly add 2.8mL of concentrated sulfuric acid, then add the neutral water sample to the scale, stir evenly, and cool to obtain the sample solution. A4.2.2.2 When monomethyl and dimethyl are present in the water sample, take about 400mL of the neutral water sample of A4.2.1 and place it in a clean, dry 500mL volumetric flask, slowly add 8.3mL of concentrated sulfuric acid, then add the water sample to the scale. , shake well, and cool to obtain sample solution 1. A4.2.3 Colorimetric determination
Take three 50mL clean and dry volumetric flasks, add 5mL of color developer to each, then add sample solution 1 or sample solution T to the scale, shake well, and let stand for 15-30 minutes. At a wavelength of 458nm, use a 5cm optical path for colorimetric measurement 1 and distilled water as a reference solution to measure the absorbance. After subtracting the absorbance measured by the blank test, find the mass (pg) contained in the sample solution from the standard curve of A4.1.1 or A4.1.2, or calculate the mass (ug) contained in the sample solution according to the regression equation. A5 Calculation
See formula (A1)
W——the concentration of hydrazine in the water sample, /I.;W--the mass of the water sample obtained from the standard curve 1 or calculated according to the regression equation, gV-the volume of the sample solution, mI. When
measured the sample solution 1, the volume of the sample solution was 44.75 mL. When measuring sample solution 1, the volume of the sample solution is 44.24 mL. A6 Determination error
(AI)
When measured under the condition of 10 mL of 1 mol/L sulfuric acid solution, the relative standard deviation is 0.8%. When measured under the condition of 30 mL of 1 mol/L sulfuric acid, the relative standard deviation is 1.5%. 201
A7 Notes
GB180612000
A7.1 The sensitivity of this analytical method and the time required for color development are affected by the ambient temperature. Therefore, the determination of the hydrazine content in the water sample should be carried out simultaneously with the drawing of the working curve.
A7.2 When the oxygen content in the sample solution to be measured is high, 1 ml of 1 mol/L hydrochloric acid can be added to each standard working solution for drawing the hydrazine standard curve, and then operate according to A4.1.1 or A4.1.2. 202
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.