This standard specifies the maximum permissible concentration of triethylamine in drinking water sources and the monitoring and testing methods. This standard applies to drinking water sources from rivers, lakes, reservoirs, ponds (wells). GB 18065-2000 Sanitary Standard for Triethylamine in Source Water GB18065-2000 Standard download decompression password: www.bzxz.net

GB18065-2000
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 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 on 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 Monitoring Station of the 061 Base of the Ministry of Aerospace. The main drafters of this standard are Xu Zhitong, Xia Yale, Zhou Ke, and Yu Lancui. This standard is entrusted by the Ministry of Health to the Environmental Health Monitoring Institute of the Chinese Academy of Defense Medical Sciences for interpretation. 1 Scope
National Standard of the People's Republic of China
Hygienic standard for triethylamine in water sources
Hygienic standard for triethylamine in water sources This standard specifies the maximum permissible concentration of triethylamine in drinking water sources and the monitoring and inspection methods. This standard is applicable to drinking water sources from rivers, lakes, reservoirs, ponds (wells). 2 Content of the standard
The maximum permissible concentration of triethylamine in drinking water sources is 3 mg/L. 3 Detection method
This standard adopts the bromophenol blue spectrophotometry to detect triethylamine in water, see Appendix A. Approved by the State Administration of Quality and Technical Supervision on April 10, 2000, GB18065-2000. Implemented on January 1, 2001. A1 Method Summary GB 18065 --2000 Appendix A (Standard Appendix) Determination of triethylamine in water Spectrophotometric method with bromophenol blue In alkaline medium, triethylamine is fixed by fluoromethane and reacts with acidic organic dye bromophenol blue to produce a yellow compound. The depth of yellow in the determination range is proportional to the content of triethylamine. It conforms to the Lambert-Beer law. The maximum absorption wavelength of the yellow compound is 410nm. Isomeric dimethylbenzene, nitrite nitrogen, nitrate nitrogen, phosphate, nitrogen and the like have no interference with this method. The determination range of diethylamine is 0.5～3.5mg/L. Triethylamine above 3.5mg/L can be diluted and determined by this method. The detection limit of this method is 0.05mg/l.
A2 Instruments and instruments
The glass instruments used should be soaked in 10% (V/V) nitric acid solution before use. Then rinse thoroughly with white water and deionized water.
A2.1 Spectrophotometer:
A2-2 Volumetric flask: 100 mL, 3 pcs
A2.3 Beaker: 50 ml. 10 pcs; wwW.bzxz.Net
A2.4 Stoppered colorimetric tube, 10 mL. 10 pcs; A2.5 Non-gradient pipette: 5 mL, 3 pcs:
A2.6 Graduation pipette: 5 mL, 2 pcs; 10 mL, 4 pcs, A2.7 Syringe: 1 ml..1 pc:
A2.8 Separating funnel: 60 ml., 10 pcs;
A2.9 Acid burette: 25 ml. or 5) mL, 1 pc. A3 Reagents and preparation methods
A3.1 Trichloroethane (CHcl.): analytical grade,
A3.2 Sodium carbonate (NazCO,): analytical grade. A3.3 Nitric acid (HNO,): 10% (V/V) solution. A3.4 Triethylamine: content is more than 99%.
A3.5 0.5 mol/L sodium carbonate: weigh 53.0 g sodium carbonate, dissolve in 500 mL water, transfer to a 1000 ImL volumetric flask, dilute to scale with water, shake well.
A3.6 0.1% bromophenol blue color developer: weigh 0.1 g bromophenol blue and dissolve in 100 ml chloroform, shake well. Remove insoluble matter with quantitative medium-speed filter paper. Place in a brown bottle. This solution is stable for at least 1 month at room temperature. A3.7 Triethylamine standard stock solution: Add 50mL of water to a 100mL volumetric flask, weigh 0.15g (0.2mL, accurately weighed to 0.0001g) of pure diethylamine with a syringe by reduction method, carefully inject into the volumetric flask, gently shake the bottle to fully dissolve the diethylamine, dilute to the scale with water and mix, calculate the concentration of the monoethylamine standard stock solution and store it in the refrigerator for future use. It can be stored for at least one month. During the weighing process, the needle must be sealed with a rubber block to prevent the leakage of monoethylamine. A3.8 (100μg/ml.) Triethylamine standard intermediate solution: The triethylamine standard stock solution is diluted with an appropriate amount of water. A3.9 (5μg/ml.) Triethylamine standard working solution: Take 5.00mL of the triethylamine standard intermediate solution and dilute to 100mL with water. Shake the hook.
A4 Analysis steps
A4.1 Drawing of standard curve
GB 18065—2000
Take 8 60 mL separatory funnels. Two of them are used as reagent blanks, and 10.00 mL of water is added to each. The remaining 6 are added with monoethylamine standard working solution 1.0), 2.00, 3.00, 4.10, 5.00.7.00 ml.. and diluted with water to 10.00 ml. Then add 1 mL of sodium carbonate solution to the reagent blank and standard separatory funnels, shake and accurately add 10.00 mL of trifluoromethane with a burette. Shake for 1 min (about 140~~160 times, pay attention to degassing), let it stand and separate, and wipe off the slight moisture that may be on the collar of the funnel with a clean absorbent cotton. Discard the initial filtrate, and then put the obtained solution into a clean beaker. Use a non-divided pipette to accurately draw 5.00ml, add 0.5mL bromophenol blue indicator to a 10ml stoppered colorimetric tube, and shake well. Place at room temperature for 15min, use chloroform as the reference solution, use 1cm colorimetric blood, and measure the absorbance of each tube at a wavelength of 410nm. Subtract the average absorbance of the reagent blank to get the net absorbance of each tube. Draw the absorbance curve of the maximum (μg) of monoethylamine contained in the sample solution on the label paper, and find the regression equation. A4.2 Water sample analysis
A4.2.1 Sampling
The sample is collected in a polyethylene bottle or a glass bottle and should be analyzed as soon as possible. When the sample is too large to be analyzed, use sulfuric acid to acidify the sample to a pH value of less than 2 to facilitate storage.
A4.2.2 Analysis of water samples
The water sample containing suspended matter is filtered with a 0.45μm filter membrane, and then the sample is drawn from it. Pipette the sample solution adjusted to neutrality (containing less than 30g of triethylamine and a volume of no more than 10mL), place it in a 60ml funnel, and add water to 10.00mL. Perform colorimetry according to the same steps as making the standard curve, measure the absorbance, deduct the average absorbance of the air day to obtain the net absorbance, and obtain the corresponding triethylamine content from the standard curve or by using the regression equation. A5 Calculation
Calculate the concentration of triethylamine in water according to formula (A1)
W-the mass of triethylamine in the sample obtained from the standard curve or calculated by the regression equation, gV-the volume of the water sample taken during analysis, ml. A6 Determination error
When the triethylamine concentration is lower than 3.5 mg/1., the relative standard deviation is less than 5%: tAl
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