This standard specifies the maximum permissible concentration of diethylenetriamine in drinking water sources and the monitoring and testing methods. This standard applies to drinking water sources from rivers, lakes, reservoirs, ponds (wells). GB 18064-2000 Hygienic Standard for Diethylenetriamine in Source Water GB18064-2000 Standard download decompression password: www.bzxz.net

GB 18064—-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 industry waste, and protect the health of the general public, this standard is formulated in accordance with 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 shall 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, and the participating units are the Academy of Military Medical Sciences of the Chinese People's Liberation Army and the 165th Station of the Ministry of Aerospace.
The main drafters of this standard are Xu Zhitong, Xia Yadong, Chen Qingzi, Gong Lancui, and Li Bingqing. The Ministry of Health entrusted the Environmental Health Monitoring Institute of the Chinese Academy of Preventive Medicine to interpret this standard. 1 Scope
National Standard of the People's Republic of China
Hygienic standard for diethylenetriamine in water sourcesGB18064—2000
This standard specifies the maximum allowable concentration of diethylenetriamine in drinking water sources and the monitoring and inspection methods. This standard is applicable to drinking water sources from rivers, lakes, reservoirs, ponds (wells). Standard content
The maximum allowable concentration of diethylenetriamine in drinking water sources is 5mg/L. 3 Detection method
This standard uses the "salicylaldehyde-ethanol spectrophotometry" to detect diethylenediamine in water, see Appendix A (Appendix to the standard). Summary of the A1 method of GB 18064—2000 Appendix A (Standard Appendix) Determination of diethylenetriamine in water Salicylaldehyde-ethanol spectrophotometry The alkaline reaction product of diethylenediamine and salicylaldehyde can react with cobalt sulfate at a pH of about 3.5 to produce a yellow compound. The depth of yellow is proportional to the content of monoethylenetriamine, which conforms to the Lambert-Beer law. The maximum absorption wavelength of the yellow compound is 390nm.
There are interferences such as unsymmetrical dimethylhydrazine, nitromethane, NH in water. When their concentration is within 5 times the concentration of diethylenetriamine, the interference is very small. There are interferences such as aniline, triethylamine, NO:, NOz in water. When their concentration is within 10 times the concentration of ethylenetriamine, the interference is very small.
When there is tung in water, positive interference will be generated, which can be solved by the calibration curve method. Negative interference occurs when formaldehyde is present. The determination range of diethylenediamine: 0.4~~3.2mg/L. Diethylenetriamine greater than 3.2mg/L can be diluted and determined according to this method. 42 Instruments and apparatus
A2.1 Spectrophotometer: with 3cm colorimetric blood. A2.2 Colorimetric tube 25ml. Stoppered colorimetric tube 12 pieces. A2.3 Volumetric flask: 1000mL, 2 pieces; 500ml., 4 pieces; 10UmL. 10 pieces, A2.4 Pipettes: 10mL. 2 pieces; 5mL, 1 piece; 1mL. 10. A3 Reagents and preparation methods
A3.1 Sulfuric acid: analytical grade.
A3.2 Ethanol: more than 95%, analytical grade.
A3.31.0mol/L sulfuric acid solution: add 500mL of distilled water to a 1000ml equal volume bottle, slowly inject 55.55ml of concentrated sulfuric acid, dilute to the mark with distilled water, and shake.
A3.40.2% sodium hydroxide solution: weigh 0.2g of sodium hydroxide (NaOH) and dissolve it in 100mL of distilled water. A3.5 Salicylaldehyde-ethanol solution: absorb 0.4mL of salicylaldehyde (CH,OHCHO) and dissolve it in 100mL of ethanol. After preparation, this solution can be stored in the dark for three days.
A3.61% cobalt sulfate solution: weigh 1.0g of cobalt sulfate (CoS047H,0), dissolve it in 100mL of distilled water. A3.7 Acetic acid-sodium acetate buffer solution (pH~3.5): 1 part by volume of 1mol/L sodium acetate and 16 parts by volume of 1mol/L acetic acid are evenly mixed.
A3.8 Preparation of diethylenetriamine stock solution and standard solution: diethylenetriamine (C,HN.) (p-0.9586g/mL), purity above 98%
A3.8.1 Preparation of diethylenetriamine stock solution: Pipette 1.2mL of diethylenetriamine into a 25mL volumetric flask containing a small amount of distilled water and weighed to one ten-thousandth of a gram, weigh again (accurate to 0.0002&), dilute to the scale with distilled water, shake well: the concentration of this solution is about 46 g/mL, and it can be used for more than three months if stored at low temperature. A3.8.2 Preparation of diethylenetriamine standard solution: Pipette a certain amount of diethylenetriamine stock solution, dilute to 20μg/mL with distilled water. It can be used for about 15 days at room temperature.
A4 Analysis Steps
GB180642000
A4.1.1 Take 0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3., 4.0 ml of diethylenetriamine standard solution respectively, inject into a set of 25 ml colorimetric tubes, add distilled water (the volume of distilled water and diethylenetriamine standard solution is 10 ml). Add 0.2 ml of 0.2% sodium hydroxide solution, mix well, add 1.5 ml of salicylaldehyde-ethanol solution, shake well and place for 6 minutes, add 0.2 ml of 1% cobalt sulfate solution, shake well, place for 4 minutes, add 2.0 ml of acetic acid-sodium ethyl acetate buffer solution, shake well, and dilute to 25 ml mark with distilled water. A4.1.2 After standing for 10 minutes, measure the absorbance at 390 nm in a spectrophotometer using the reagent air as the reference solution and a 3 cm pathlength colorimetric instrument III.
A4.1.3 Based on the measured absorbance and the corresponding diethylenetriamine content, draw a standard curve and find the regression equation. A4.2 Water sample analysis
Collect water samples and clean them. Adjust the pH to about 7 with 1.0 mal/I sulfuric acid. Pipette 10.0 mL of the water sample into a 25 mL stoppered colorimetric tube and measure the absorbance according to methods A4.1.1 to A4.1.4. The corresponding diethylenetriamine content can be found from the standard curve or calculated according to the regression equation. A4.3 Determination method when hydrazine exists in water
A4.3.1 Take different contents of hydrazine solutions into a 25 mL stoppered colorimetric tube and use methods A4.1.1 to A4.1.4 to prepare a calibration curve for hydrazine (note that it is necessary to filter with a fixed filter paper before colorimetry). A4.3.2 According to the method of A4.1.1A4.1.4, measure the absorbance value of the water sample A13A4.3.3 According to the "Determination of Water Quality - Spectrophotometric Method for Dimethylaminobenzaldehyde" National Standard Analysis Method (GB/T15507-1995), measure the content of hydrazine in the water sample C
A4.3.4 On the calibration curve, find the absorbance value corresponding to the content A2A4.3.5 On the standard curve of diethylenetriamine, find the content corresponding to the absorbance value A4, which is the content of diethylenetriamine in the water sample, and calculate it according to formula (A1).
A, = A, - A.
Wherein: A: --- absorbance value corresponding to the content of diethylenediamine in the water sample; A1 --- absorbance value of the water sample:
A.-- absorbance value corresponding to the content of ethylenediamine in the water sample (C,). A5 Determination error
. (A1) wwW.bzxz.Net
When the concentration of diethylenediamine is 0.4 mg/L, the relative standard deviation is not more than 5.5%, and when the concentration of diethylenediamine is 3.2 g/mL, the relative standard deviation is not more than 1.25%.
A6 Precautions
A6.1 Temperature will affect the measurement results. When the temperature is high, the measured value is low. The determination of diethylenediamine content in water samples should be carried out in the same direction as the standard curve.
A6.2 This method is suitable for a temperature range of 5~30.
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