GB 18554-2001 Occupational exposure limits for carbon monoxide in workshop air in plateau areas

This standard specifies the maximum permissible concentration and monitoring method of carbon monoxide in workshop air in plateau areas above 2000m above sea level. This standard is applicable to all types of industrial enterprises in plateau areas above 2000m above sea level. GB 18554-2001 Occupational exposure limit of carbon monoxide in workshop air in plateau areas GB18554-2001 Standard download decompression password: www.bzxz.net

GB18554·-2001
This standard is formulated for the first time based on toxicological experiments, on-site labor hygiene surveys, and occupational epidemiological survey data. It is a health standard for environmental monitoring and health supervision in plateau workplaces. This standard has been implemented since May 1, 2002. The appendix to this standard is the appendix to the standard. This standard is proposed by the Ministry of Health of the People's Republic of China. The drafting unit of this standard: Qinghai Provincial Institute of Occupational Disease Prevention and Control. The drafters of this standard: Zhang Shijie, Shu Changping. This standard is entrusted to the Institute of Labor Hygiene and Occupational Diseases, Chinese Academy of Preventive Medicine for interpretation. 706
National Standard of the People's Republic of China
Occupational exposure limit for carbon monoxidein the air of high altitude workplaceGB18554—2001
This standard specifies the maximum allowable concentration and monitoring method of carbon monoxide in the air of workshops in plateau areas above 2000m above sea level. This standard is applicable to all kinds of industrial enterprises in plateau areas above 2000m above sea level. 2 Hygiene requirements
The maximum allowable concentration of carbon monoxide in workshop air in plateau areas is: 20 mg/m2 in areas between 2000~3000m above sea level, and 15 mg/m2 in areas above 3000m above sea level
3 Monitoring and inspection method
The monitoring and inspection method recommended by this standard adopts the infrared analyzer determination method, 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-rrKAoNrKAca-www.bzxz.net
Implementation on May 1, 2002
A1 Principle
GB18554-2001
Appendix A
(Appendix to the standard)
Determination method of carbon monoxide in workshop air by infrared analyzer Carbon monoxide gas in the air selectively absorbs infrared rays, and the absorption is related to the concentration of carbon monoxide. When carbon monoxide enters the analyzer gas chamber, the infrared radiation at the center of the spectrum band is first absorbed in the air, resulting in the weakening of the pressure pulse in the absorption chamber. Therefore, the pressure semi-equilibrium is destroyed. The generated pressure pulse is applied to the differential film microphone through the capillary buttocks and is converted into a change in capacitance. These changes are converted into a measured value proportional to the gas concentration through the amplifier and finally displayed. A2 Instrument
A2.1 Aluminum foil composite film gas collection bag: volume 400 ml~~600 mLA2.2 Two-ball or instrument with the same function,
A2.3 Infrared analyzer.
A3 Reagents
A3.1 Zero calibration gas: Use high-purity nitrogen in a steel cylinderA3.2 Standard nitrogen gas: Use carbon dioxide standard gas in a lead alloy steel cylinderA4 Sampling
Use a two-ball or instrument with the same function to inject the on-site air into the gas sampling bag, correct the pressure and release it, repeat this operation 5 to 6 times; then fill the gas sampling bag, seal the gas escape port and bring it back to the laboratory for determination. A5 Analysis steps
A5. Zero point adjustment: The instrument must be zeroed before use. Use high-purity nitrogen or the zero point adjustment standby prepared by the manufacturer for zeroing calibration gas. Refer to the instrument instructions for zeroing methods. After injecting zeroing calibration gas, wait until the indicated value is constant before adjusting the sensitivity. A5.2 Sensitivity adjustment: Adjust the sensitivity according to the requirements of the instrument used. When adjusting the sensitivity, the carbon monoxide gas at the outlet of the instrument needs to be discharged outdoors to prevent poisoning.
A5.3 Sampling measurement: Sampling and measurement according to the requirements of the instrument used. During measurement, the gas outlet must be strictly distinguished to avoid errors. After each sample is completed, it must be returned to zero before the next sample can be made. A6 Note
In order to avoid the pressure difference between different altitudes affecting the measurement results, the sampling and measurement locations should be at the same altitude as much as possible, and the maximum altitude difference should not exceed 100m.
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