GB 16199-1996 Hygienic standard for dibutyltin dilaurate in workshop air

This standard specifies the maximum allowable concentration of dibutyltin dilaurate in workshop air and its monitoring and inspection methods. This standard is applicable to all types of enterprises that produce and use dibutyltin dilaurate. GB 16199-1996 Hygienic standard for dibutyltin dilaurate in workshop air GB16199-1996 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Health standard for dibutyltin dilaurate in the air of workplace
1 Subject content and scope of application
GB16199—1996
This standard specifies the maximum allowable concentration of dibutyltin dilaurate in the air of workplace and its monitoring and inspection methods. This standard is applicable to all types of enterprises that produce and use dibutyltin dilaurate. 2 Hygiene requirements
The maximum allowable concentration of dibutyltin dilaurate in the air of workplace is 0.2mg/m (skin). 3 Monitoring and inspection methods
The monitoring and inspection methods of this standard adopt the disulfide colorimetric method (see Appendix A). 4 Supervision and implementation
Health administrative departments at all levels are responsible for supervising the implementation of this standard. Approved by the State Administration of Technical Supervision on April 3, 1996 and implemented on September 1, 1996
A1 Principle
GB161991996
Appendix A
Disulfide colorimetric method
(Supplement)
Dibutyltin dilaurate can directly react with disulfide in boric acid buffer at pH 8.4 to form a red complex, which has an absorption peak at 500nm and can be quantitatively measured by colorimetry. A2 Apparatus
A2.1 Multi-hole glass plate absorption tube.
A2.2 Stoppered colorimetric tube, 15mL.
A2.3 Individual sampler.
A2.4 Spectrophotometer. bZxz.net
A3 Reagents
A3.1 Disulfide chloroform solution with a transmittance of 60%. A3.2 pH 8.4 boric acid buffer: Dissolve 19g sodium tetraborate (NazB,O,·10H,O), 2.5g sodium ethylenediaminetetraacetate, and 12g boric acid in distilled water and dilute to 1000ml. A3.3 Chloroform.
A3.4 Dibutyltin dilaurate standard solution, 1mL contains 20ug of the compound. A4 Sampling
Take a porous glass plate absorption tube containing 2ml pH 8.4 boric acid buffer, connect it to the sampler and extract 20 air at a flow rate of 0.5I/min.
A5 Analysis steps
A5.1 Drawing of standard curve
Take 6 15mL colorimetric tubes, number them, and prepare standard tubes according to Table A1: Table A1
Contains. Monobutyltin laurate, μg
Borate buffer at pH 8.4, mL
Butyltin dilaurate standard solution, mL
Chloroform, ml.
60% transmittance dithiol solution, mL
Shake vigorously for 50 times and let stand for 20 minutes, remove the upper buffer, adjust the zero point of 1cm colorimetric cup at 500nm with chloroform, and perform colorimetric determination.
A5.2 Sample analysis
Move all the buffer in the absorption tube into a 15mlL colorimetric tube, rinse the absorption tube twice with 3mL of borate buffer at pH 8.4, combine the rinse solution in the colorimetric tube and make it up to 5mL, add 5mL of chloroform, and the rest of the steps are the same as the standard tube. A6 Calculation
Wherein X--
Concentration of dibutyltin dilaurate in the air, mg/m; C-content of dibutyltin dilaurate obtained from the standard curve, μg; V. ——Sampling volume under standard conditions, L. A7 Precautions
A7.1 Both the disulfide solution and the dibutyltin dilaurate standard solution use chloroform as solvent and should be stored at low temperature (4°C) and away from light. A7.260% transmittance disulfide solution should be temporarily prepared before use and its transmittance should be calibrated. A7.3 Each time the reagent is replaced, the standard curve should be redrawn. (A1)
A7.4 If the concentration of dibutyltin dilaurate in the air is too high or too low, the sampling time can be appropriately adjusted to make the measurement result within the linear range of the standard curve.
A7.5 When the sampling volume is 20L, the detection limit of this method is 0.05mg/m. Additional Notes:
This standard was proposed by the Ministry of Health of the People's Republic of China. This standard was drafted by the Department of Occupational Hygiene of Shanghai Medical University and the Beijing Institute of Occupational Hygiene and Occupational Disease Prevention and Control. The main drafters of this standard are Liang Youxin, Zhang Wencheng, Jiang Xuezhi, Dai Riying, and Zhang Xueshu. This standard is interpreted by the Institute of Occupational Hygiene and Occupational Diseases of the Chinese Academy of Preventive Medicine, the technical unit entrusted by the Ministry of Health.
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