GB 18539-2001 Occupational exposure limits for propylene oxide in workplace air

This standard specifies the maximum permissible concentration and time-weighted average permissible concentration of propylene oxide in workshop air and its monitoring and inspection methods. This standard is applicable to all types of industrial enterprises that produce and use propylene oxide. GB 18539-2001 Occupational exposure limits for propylene oxide in workshop air GB18539-2001 Standard download decompression password: www.bzxz.net

GB185392001
This standard is formulated for the first time based on toxicological experiments, on-site labor hygiene surveys, epidemiological survey data and reference to foreign occupational exposure limits. It is a health standard used for workplace environmental monitoring and health supervision. This standard shall be implemented from May 1, 2002. Appendix A of this standard is the appendix of the standard. This standard is proposed by the Ministry of Health of the People's Republic of China. The drafting units of this standard are the Institute of Labor Hygiene and Occupational Diseases, Chinese Academy of Preventive Medicine, Safety and Environmental Protection Department of Yueyang Petrochemical General Plant and Institute of Occupational Disease Prevention and Control of the General Plant.
The main drafters of this standard are: Lü Boqin, Zeng Zhaohui, Li Guohong, Chen Jijiao and Zhou Xiangfeng. This standard is entrusted to the Institute of Labor Hygiene and Occupational Diseases, Chinese Academy of Preventive Medicine for interpretation. 657
1 Scope
National Standard of the People's Republic of China
Occupational exposure limit for propylene oxide in the air of workpace
GB 18539 -2001bzxz.net
This standard specifies the maximum permissible concentration and time-weighted average concentration of propylene oxide in the air of workpace and its monitoring and inspection methods. This standard is applicable to all types of industrial enterprises that produce and use propylene oxide. 2
Hygiene requirements
The maximum permissible concentration of propylene oxide in the air of workpace is 20mg/m3. The time-weighted average concentration of propylene oxide in the air of workpace is 10mg/m3Monitoring and inspection methods
The monitoring and inspection methods of this standard adopt gas chromatography, see Appendix A (Appendix to the standard). Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on December 4, 2001 G58
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Implementation on May 1, 2002
A1 Principle
GB 18539--2001
Appendix A
(Appendix to the standard)
Direct injection gas chromatography method for propylene oxide in workshop air Propylene oxide in the air is collected by syringe, which is preferably connected to the injection. After separation on a Porapak-Q column, it is detected by a hydrogen flame ionization detector, and the retention time is used for qualitative analysis and the peak height is used for quantitative analysis. A2 Instruments
A2.1 Syringe: 100 mL, 1 μL
A2.2 Gas chromatograph, oxygen flame ionization detector Chromatographic column: Column length 0.6 m, inner diameter 2 mm, stainless steel column; Column content: Porapak-Q, 50~80 months: Column temperature: 150℃, carrier gas (nitrogen): 12mL/min Gasification temperature: 180℃, detection chamber temperature: 180℃. A3 Reagents
A3.1 Porapak-Q stationary phase.
A3.2 Propylene oxide standard gas: Use a 1 μL syringe to take a certain amount of propylene oxide (the mass of 1 μL propylene oxide at 20℃ is 0.8304mg), inject it into a 100ml syringe, and use clean air to make a standard push gas of a certain concentration. A4 Sampling
Use a 100mL syringe to draw and wash 3 times at the sampling site, then fill it with air, put on a rubber cap and place it vertically, and then analyze it. A5 Analysis steps
A5.1 Control test: Bring a 100mL syringe to the sampling point, except not collecting air, and do the same operation as the sample as the blank control of the sample.
A5.2 Sample treatment: Place the sample and control sample syringes vertically, and record the temperature and air pressure of the laboratory. A5.3 Drawing of standard curve: Take a certain amount of standard gas, dilute it with clean air to 0.02, 0.040.08 and 0.16/㎡l standard gas, take 1.0ml respectively. Inject, measure retention time and peak height. Repeat 3 times for each concentration, and draw a standard curve with the mean peak height against the cyclohexane content (g).
A5.4 Measurement: Determine the sample and blank control according to the conditions of the standard curve determination, and inject 1.0mL. Subtract the peak height of the blank sample from the peak height of the sample, and check the standard curve to get the maximum content of propylene oxide (g). Retention time is a qualitative indicator. A6 Calculation, see formula (A1)
c = m/V. × 1 000
Wu Zhong: —
-Propylene oxide concentration in air, mg/m, m——-Measured propylene oxide content·ugV.—Converted to injection volume under standard conditions, mL. (AI
A7 Explanation
GB185392001
A7.1 The detection limit of this method is 1.8×10-μg (direct injection of 1ml. air sample); the minimum detection concentration is 1.8mg/m. A7.2 When the content of epoxy alkane is 0.02, 0.04, 0.08.0.16, the relative standard deviation is 2.5%, 1.3%, 3.7% and 1.1%. 6
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