GB 16236-1996 Hygienic standard for trimethyltrinitramine (hexachlorobenzene) in workshop air

This standard specifies the maximum permissible concentration of trimethyl trinitramine (RDX) in the air of workshops and its monitoring and testing methods. This standard is applicable to all types of enterprises that produce and use trimethyl trinitramine (RDX). GB 16236-1996 Hygienic Standard for Trimethyl Trinitramine (RDX) in Workshop Air GB16236-1996 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Health standard for cyclonite (RDx) in the air of workplace1 Subject content and scope of application
GB 16236--1996
This standard specifies the maximum allowable concentration of trimethyl trinitramine (RDx) in the air of workplace and its monitoring and inspection methods. This standard is applicable to all types of enterprises that produce and use trimethyl trinitramine (RDx). 2 Hygiene requirements
The maximum allowable concentration of trimethyl trinitramine (RDx) in the air of workplace is 3mg/m3. The time-weighted average concentration is 1.5mg/m3. Www.bzxZ.net
3 Monitoring and inspection methods
The monitoring and inspection methods of this standard adopt the chromotropic acid colorimetric method, see Appendix A (Supplement). Approved by the State Bureau of Technical Supervision on April 3, 1996 546
Implementation on September 1, 1996
A1 Principle
GB16236—1996
Appendix A
Chromotropic acid colorimetric method
(Supplement)
The formaldehyde decomposed by trimethyltrinitroamine in sulfuric acid reacts with chromotropic acid to produce purple color, which is quantitatively determined by colorimetry. A2 Instruments
A2.1 Explosion-proof dust sampler, flow meter, 0～20L/minA2.2 Sampling clamp;
A2.3 Ultrafine glass fiber filter paper;
A2.4 Stoppered colorimetric tube 10mL, 25mL;
A2.5 Quantitative sampler 5mL, 10mL;
A2.6 Water bath;
Vortex mixer;
Spectrophotometer.
A3.1 Acetone (AR).
Sulfuric acid (AR), P2o=1. 84 g/mL. Sodium chromotropic acid (AR) solution: Weigh 1g sodium chromotropic acid and dissolve it in 100mL water. The solution should be colorless or light yellow. A3.3
Trimethyl trinitramine standard solution: weigh 0.1000 g of trimethyl trinitramine, dissolve it in an appropriate amount of acetone, transfer it into a 100 mL volumetric flask, dilute it to the mark with acetone, 1 mL of this solution contains 1.0 mg of trimethyl trinitramine, take 1 mL of this solution and put it into a 100 mL volumetric flask, dilute it to the mark with acetone, 1 mL of this solution contains 10 μg of trimethyl trinitramine. A4 Sampling
Put the ultrafine glass fiber filter paper in the sampling clip and extract 100L of air at a speed of 10L/min. A5 Analysis steps
A5.1 Control test: Treat the ultrafine glass fiber filter paper that has not been sampled in the same way as the sample as a blank control. A5.2 Sample processing: Loosen the sampling clamp, place the filter paper in the clamp on the mouth of a 25mL colorimetric tube, push the filter paper to the bottom of the tube with a glass rod, use 10mL of acetone to wash the trimethyltrinitramine on the glass rod into the colorimetric tube, cover and soak for 10 minutes, mix well, and take 1mL of the soaking solution into another colorimetric tube for analysis.
A5.3 See Table (A1) for the preparation of standard tubes:
Table A1 Trimethyltrinitramine Standard Colorimetric Tubes
Standard Solution (10 μg/mL), mL
Trimethyltrinitramine Content, μg
GB16236—1996
A5.4 Drawing of Standard Curve: Place the standard tube in a 80℃ water bath to evaporate the acetone, add 1mL of sulfuric acid after cooling, mix with a vortex mixer, place at room temperature for 20 minutes, add 5mL of water, add 1mL of chromotropic sodium solution, mix, add 3mL of sulfuric acid, mix, place in boiling water for 25 minutes, and colorimetric at 580nm, 1cm after cooling, and draw a standard curve with the trimethyltrinitramine content and absorbance value. A5.5 Determination: The sample tube operation is the same as the standard tube, and the standard curve is checked for quantification after colorimetric comparison. A6 Calculation
Calculate the concentration of trimethyl trinitramine in the air according to formula (A1): 10C
Where: X--trimethyl trinitramine concentration in the air, mg/m~;c
The content of trimethyl trinitramine in the sample found on the standard curve, g; V.
Convert to the sampling volume under standard conditions, L. A7 Description
A7.1 The detection limit of this method is 1μg/10mL, the precision is 1.4%~9.1%, and the recovery rate is 90.3%~95.7%. A7.2 There is no commercial standard for trimethyl trinitramine, and the production pure product can be used for analysis. A7.3 Sodium chromotropic acid must be prepared before use, otherwise it will affect the color development. A7.4 When using sulfuric acid for acid hydrolysis, all sample residues in the test tube must be moistened, otherwise the acid hydrolysis will be incomplete, affecting the analysis results. Additional instructions:
This standard is proposed by the Ministry of Health of the People's Republic of China. (A1)
This standard was drafted by the Institute of Labor Hygiene and Occupational Diseases, Chinese Academy of Preventive Medicine, the Institute of Environmental Protection and Labor Protection, Fifth Academy of Ordnance Industry, Liaoning Provincial Institute of Labor Hygiene, and Shaanxi Provincial Health and Epidemic Prevention Station. The main drafters of this standard are Dong Shuwei, Zhu Min, Liu Jishan, Xu Fangli, and Zhang Xiqi. The Institute of Labor Hygiene and Occupational Diseases, Chinese Academy of Preventive Medicine, the technical unit entrusted by the Ministry of Health, is responsible for the interpretation of this standard. 5418
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