GB 8773-1988 Hygienic standard for methyl acrylate in workshop air

This standard is applicable to all types of enterprises that produce and use methyl acrylate. GB 8773-1988 Hygienic standard for methyl acrylate in workshop air GB8773-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hygienic standard for methylacrylate in the air of workshops
This standard applies to all types of enterprises that produce and use methyl acrylate. 1 Hygienic requirements
The maximum allowable concentration of methyl acrylate in workshop air is 20 mg/m*2 Monitoring and inspection method
The monitoring and inspection method recommended by this standard adopts gas chromatography, see Appendix A. Approved by the Ministry of Health of the People's Republic of China on February 23, 1988, UDC661.92.013.8:628.512. GB 8773—88. Implemented on December 1, 1988. A.1 Principle GB 8773 --88 Appendix A Gas chromatography (supplementary) Methyl acrylate in the air is collected on silica gel and desorbed at high temperature. After separation on a GDX-102 column, it is detected by an ammonia fusion ionization detector. The retention time is used as the characteristic and the peak height is used for quantification. The detection limit of this method is 1.4×10*μg (1 ml of desorbed gas sample is injected). A.2 Instruments wwW.bzxz.Net
Silica gel sampling tube: 15 tm long, 3.5~1.0 mm inner diameter glass tube, filled with 200 m silica gel, fixed at both ends with corrugated glass wool. Atmospheric sampler or syringe: 100 ml.1 ml. Pyrolysis furnace: composed of preheating tube, desorption tube and pressure regulator. Gas chromatograph; hydrogen flame ionization detector. A.3 Reagents
A.3.1 GDX-102; 40~60 days,
A.3.2 Activated silica gel: 40~~6) mesh, A.3.3 Methyl acrylate.
A.4 Sampling
Remove the rubber caps at both ends of the silica gel sampling tube at the sampling site, and hang the cooking hood, collect 0.10.5L of on-site air at a rate of 100ml/min, put on the rubber cap, and analyze in the laboratory. A.5 Analysis steps
A, 5. 1 Chromatographic conditions
Xeno column: column length 2m, inner diameter 4mm, stainless steel column. GDX-102. Stem sampling 150℃ (or 160~170C). a.
Vaporization chamber temperature: 170℃.
Detection air temperature: 170℃
d. Carrier gas (nitrogen+), 110 ml/min.
A.5.2 Standard curve drawing
According to the conventional method, dilute the ester of two olefins to 0.1.0.2, 0.3, 0.1 and 0.5μg/ml. Take 1ml of sample for injection respectively, and measure the retention time and peak height. Repeat the concentration for 3 times, take the average value of the peak height, plot the methyl acrylate content against the peak height, and draw a standard curve. The retention time is a qualitative indicator.
A. 5.3 Sample analysis
Connect the sampling tube inlet to the syringe, and the other end to the pyrolysis furnace inlet. Desorb to 100ml at a rate of 100ml/min under 18U conditions. After exile to room temperature, take 1ml of desorbed gas for injection. Use retention time for qualitative analysis and peak height for quantitative analysis. A.6 Calculation
Where, x -.
Concentration of methyl acrylate in air.mg/m;
:com88
GB 8773
C—Concentration of methyl acrylate in the desorbed gas, V. - Convert to the sampling volume under standard conditions, L. Additional Notes:
This standard was proposed by the Labor Hygiene Standards Promotion Subcommittee of the National Health Standards Technical Committee. This standard was drafted by the Xilongjiang Provincial Labor Hygiene and Occupational Diseases Research Institute. The main drafter of this standard is Yang Yinsen.
This standard was interpreted by the Labor Hygiene and Occupational Diseases Research Institute of the Chinese Academy of Preventive Medicine, the technical unit entrusted by the Ministry of Health.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.