This standard specifies the maximum permissible concentration of hydroquinone (HQ) in the air of a workplace, the time-weighted average permissible concentration and its monitoring and testing methods. This standard is applicable to all types of industrial enterprises that produce, process and use hydroquinone. GB 18543-2001 Occupational exposure limits for hydroquinone in the air of a workplace GB18543-2001 Standard download decompression password: www.bzxz.net

GB 185432001
This standard is formulated based on toxicological experimental research, on-site labor hygiene survey, occupational population survey data, and reference to relevant foreign exposure limits.
This standard will be implemented from May 1, 2002. Appendix A of this standard is a recommended appendix.
This standard is proposed by the Ministry of Health of the People's Republic of China. The drafting unit of this standard: Shanghai Medical University. The main drafters of this standard: Gong Zichu, Wu Xiangdong, Huang Lei, Wu Xiaoqin, Chen Zhiming. This standard is entrusted to the Institute of Labor Health and Occupational Diseases, Chinese Academy of Preventive Medicine for interpretation. 669
National Standard of the People's Republic of China
Oceupational exposure limit for hydroquinonein the air of. warkplace
GB 18543—2001
This standard specifies the maximum permissible concentration, time-weighted average permissible concentration and monitoring and inspection methods of hydroquinone (HQ) in the air of the workshop. This standard is applicable to all types of industrial enterprises that produce, process and use hydroquinone. 2 Hygiene requirements
The maximum permissible concentration of hydroquinone in the air of the workshop is 2.0 mg/m3, and the time-weighted average permissible concentration is 1.1 ng/m23 Monitoring and inspection methods
The concentration of hydroquinone in the air of the workshop is determined by high performance phase chromatography, see Appendix A. Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on December 4, 2001670
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Implementation on May 1, 2002
A1 Principle
GE18543
Appendix A
(Appendix to the standard)
Test method for monitoring hydrogen aldehyde in workshop air
Hydrogen aldehyde (HQ) in the air is collected by microporous filter membrane and dissolved in 1% acetic acid solution. Then it is separated by high performance liquid chromatography and detected by ultraviolet detector. According to the retention time of the chromatographic peak, the peak height is used for qualitative analysis and quantitative analysis, and the content of the substance to be tested in the sample is calculated. A2 Instruments
GI.SON high performance liquid chromatograph, ultraviolet detector, 100μL micro syringe, 20mL capacity screw cap sealed light-proof bottle, GC-2 type individual sampler, 0. 8 um1 fiber resin filter membrane. A3 Reagents
A3.1 Hydrogen aldehyde standard stock solution (3.6mg/mL): Accurately weigh 90.0mg of hydrogen aldehyde and dissolve it in 25mL.1% acetic acid solution A3.2 Hydrogen aldehyde standard application solution: Take an appropriate amount of the above stock solution and use 1% acetic acid to prepare standard application solutions with concentrations of 0.432, 1.800, 3.600, 18.000, and 31.680mg/m1.
A3.336% acetic acid, redistilled water.
A4 Air multiplication sample
Before sampling, calibrate the flow of the sampler and install the filter membrane into the sampling clamp. Sampling was performed at the breathing zone of the human body at the hydrogen awakening operation point, with a gas flow rate of 31./min and a total gas volume of 3(0~180T. After sampling, the filter membrane was immediately transferred to a wide-mouth bottle containing 10mL 1% acetic acid with bamboo tweezers and sealed tightly.
A5 chromatograph operating conditions
U-BundapackC1825cm×4.6mmID, Partisil10-ODS separation column. Ultraviolet identifier (wavelength 290nm). 1% acetic acid aqueous solution was used as the mobile phase, with a flow rate of 1mL/nin. The injection volume was 100uL, the column temperature was the same as the air temperature, and the paper speed was 5mm/m in. A6 Standard curve drawing
Take 100uL of standard solution with concentration of 0.132, 1.803.600, 18.000.31.680Hg/mL respectively and analyze under the chromatographic strip. Draw the standard curve with the peak height of the standard sample as the ordinate and the concentration of the standard sample as the abscissa. A7 Sample analysiswwW.bzxz.Net
Take 100L of sample for injection, measure the peak height, and check the IIQ content on the standard curve. Use a blank filter membrane to perform the same treatment as the sample as a control.
A8 Calculation
Calculate the sample concentration according to formula (A1)
(W - B) × 10°
WHQ content in sample + μg:
（A1）
BHQ content in blank control, μg
Air sampling volume,.
DSample recovery rate.
GB.18543—2001
This method is used to quantitatively analyze the HQ concentration in the air. The hydrogen aldehyde sample can be stored for 1 to 3 weeks. Under chromatographic conditions, hydrogen aldehyde can be well separated. There is a good linear relationship between the chromatographic peak height and the hydrogen aldehyde concentration. The linear range is 0.432~31.680g/mL, and the detection limit is 9.38×10μg. The sensitivity, precision, recovery rate, etc. of the method can meet the requirements of air monitoring. 672
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