This standard specifies the method for determining the concentration of sodium hydroxide in the air of a workshop by acid-base titration. This standard applies to the determination of the concentration of sodium hydroxide in the air of a workshop where sodium hydroxide is produced and used. GB/T 16106-1995 Method for determining the concentration of sodium hydroxide in the air of a workshop by acid-base titration GB/T16106-1995 Standard download decompression password: www.bzxz.net

IcS 13.040.30
National Standard of the People's Republic of China
GB/T 16106—1995
Workplace air-- Determination of sodium hydroxide Aeidimetric nethodPublished on January 23, 1996
State Administration of Technical Supervision
Ministry of Health of the People's Republic of China
Implementation on July 1, 1996
GR/T16106—1995
This standard is a monitoring method for labor hygiene standards, used to monitor the concentration of sodium hydroxide in the air of workplaces. This standard is based on foreign monitoring methods, and is proposed after laboratory research and field verification in accordance with my country's situation. This standard has been implemented since January 1, 1956. This standard was proposed by the Ministry of Industry and Health of the People's Republic of China. The drafting unit of this standard is the National Health and Epidemic Prevention Station of the People's Republic of China. The main drafters of this standard are Wu Zhuoxu and Zhao Guaili. This standard was selected by the Institute of Labor Hygiene and Occupational Diseases of the Chinese Academy of Preventive Medicine, which was entrusted by the Ministry of Health. 1 Scope
National Standard of the People's Republic of China
Determination of sodium hydroxide in workshop air by acid-base titration
Workplece slru-Deterrafnaton of spdum hydrndde-Acidimetrk methnd
This standard specifies the method for determining the concentration of sodium hydroxide in workshop air by acid-base titration. This standard is applicable to the determination of the concentration of sodium hydroxide in the air of workshops that produce and use oxidizing agents. 2. Method
CB/T 76106:1995
Sodium hydroxide is collected by single membrane sampling and then dropped into water. Excessive amount of sodium hydroxide is added. With methyl cyanide as indicator, sodium tetraborate standard solution is used to determine the concentration of sodium hydroxide. 3. Apparatus
3.1 Sampling center.
3.2 Filter material, ethylene peroxide filter membrane
3.3 Air pump.
3.4 ​​Flowmeter, 0~10L/tnira. www.bzxz.net
3.5 Standard reagent, 10ml,
3.6 Flask, 100mL.
4 Reagents
The reference reagents used in this method are required to be of high purity. 4.10.0 100mol/L standard solution,
4.2 Methyl red solution, 2g/L; 20mg methyl red is dissolved in 100% (V/V) ethanol. 4.3.0 100mDl/sodium tetraborate standard solution: weigh 953g sodium tetraboron (NaB,O,·10II,O7), transfer it into a 50mL standard bottle with water, dilute to 400mL, this solution 1ml is equivalent to 400mol of sodium hydroxide, 5 Sampling
Fix the filter membrane on the sampling device, and take 200L of gas at a speed of 5L/min. 6 Analysis steps
6.1 Control test Take the sample with the membrane to the sampling point. Except for the air sample, the other samples are used as the air control.
6.2 Sample processing Remove the pig membrane: put it in a 50mL cup, add 10ml water, stir continuously. Dissolve the oxide in water and dissolve it in the water. 061995
Roll the image into the mirror plate, wash it twice with water for 10 minutes, and pour the washed filter into the sugar bottle. 6.3 Take the sample that has been treated and roll it, add 19.20mL. 0.01CCnl/1. hydrochloric acid standard solution and 2 drops of methylparaben frozen solution, and incubate for 3~min (to make the water droplets disappear). When it cools to 60~70℃, titrate it with 0.0100mol/L sodium tetrachloride standard solution. Yellow. Record the amount used.
7 Calculation
7.1 Use formula (1) to convert the sample volume into the volume under standard conditions. Y-VX
In the test, V. Sample volume under standard conditions,. Sample volume,.
1 Blue Court: Heart
Atmospheric pressure, kPa.
7.2 Use formula (2) to calculate the concentration of sodium hydroxide, 273
(—) × 400
Wherein: c—Liquidity of sodium hydride in air, mg/ml; a—Amount of 0.0100raol/L sodium hydride standard solution used for sample titration, mL; FV.—Sample volume under standard conditions. 1..8 Explanation
8.1 The detection limit of this method is 20g/20ml. When the sample is 200L, the determination range of this method is 0. 1～2Umg/m8.2 The sampling efficiency of this method is 95.5~98.8%. The elution efficiency is 99.2%~10%. 3 When sampling, care must be taken to prevent the sample from being contaminated. After sampling, the sample must be treated and tested. ()
B.4 When using Greek thiamine to titrate tartrate, the interference of carbon dioxide in the air must be eliminated. Therefore, use benzoic acid as an indicator and titrate at a temperature close to the boiling point
B.5 This method can also be used to determine potassium hydroxide in the air.
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