GB 16233-1996 Hygienic standard for acetic acid in workplace air

This standard specifies the maximum permissible concentration and time-weighted average permissible concentration of acetic acid in workshop air and its monitoring and inspection methods. This standard is applicable to all types of enterprises that produce and use acetic acid. GB 16233-1996 Hygienic Standard for Acetic Acid in Workshop Air GB16233-1996 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Health standard for acetic acid in the air of workplace
Health standard for acetic acid in the air of workplaceSubject content and scope of application
GB 16233-1996
This standard specifies the maximum allowable concentration and time-weighted average allowable concentration of acetic acid in workplace air and its monitoring and inspection methods. This standard applies to all types of enterprises that produce and use acetic acid. 2 Hygiene requirements
The maximum allowable concentration of acetic acid in workplace air is 20mg/m. The time-weighted average allowable concentration is 10mg/m2.3 Monitoring and inspection methods
The monitoring and inspection methods of this standard adopt gas chromatography. See Appendix A (Supplement). Approved by the State Administration of Technical Supervision on April 3, 1996 536
Implemented on September 1, 1996
A1 Principle
GB16233—1996
Appendix A
Gas chromatography
(Supplement)
Use activated carbon tube for sampling, desorb with formic acid, separate with FFAP-H,PO.-ChromosorbWAW-DMCS column, and detect with hydrogen flame ionization detector. Qualitative analysis is based on retention time, and quantitative analysis is based on peak height. A2 Instruments
A2.1 Sampler, 0~～1L/min.
A2.2 Micro syringe, 5μL.
A2.3 Stoppered test tube, 5mL.
A2.4 Activated carbon tube: TG-1 type. Length 80mm, inner diameter 4mm, front section 100mg, back section 50mg, 20-40 mesh activated carbon tube. A2.5 Gas chromatograph, hydrogen flame ionization detector. Chromatographic column: column length 2m, inner diameter 3mm, glass column. FFAP:H,PO:Chromosorb WAW-DMCS=3:0.5:100; column temperature: 135℃
vaporization chamber temperature: 230℃;
detection chamber temperature: 215℃;
carrier gas (nitrogen): 19mL/min.
A3 Reagents
A3.1 Acetic acid, chromatographic grade.
A3.2 Formic acid, chemically pure, redistilled.
A3.3FFAP, chromatographic stationary liquid.
A3.4ChromosorbWAw-DMCS support, 6080 mesh. A3.5 Acetic acid standard solution: Add 10mL formic acid to a 25mL volumetric flask, weigh accurately, add 2 drops of acetic acid, weigh accurately again, the difference between the two weighings is the mass of acetic acid, add formic acid to the scale, mix well, calculate the acetic acid content in 1mL solution, this solution is the reserve solution, and store in the refrigerator. Take the reserve solution before use and dilute it with formic acid to 1mL standard solution containing 0, 0.1, 0.8, and 1.5mg acetic acid. A4 Sampling
Open the activated carbon tube at the sampling site, connect the 50mg end to the sampling pump, place it vertically, extract 3L of air at a speed of 0.2L/min, and then put plastic caps on both ends of the tube. Record the on-site temperature and air pressure at the same time. A5 Analysis stepsbzxZ.net
A5.1 Control test: Open the activated carbon tube at the site, but do not extract air, store it separately from the sample tube, and process and analyze it simultaneously. A5.2 Sample treatment: Pour the two sections of activated carbon in the sample tube and the control tube into stoppered test tubes respectively, add 2mL of formic acid, plug the tubes tightly, shake and soak for 30 minutes.
A5.3 Drawing of standard curve: Take 2uL of acetic acid standard solution of 0, 0.1, 0.8, and 1.5mg/mL for injection, measure each concentration 3 times, and draw a standard curve with the average peak height measured and the corresponding acetic acid content of 0, 0.2, 1.6, and 3.0ug. A5.4 Determination: Take 2μuL of sample solution for injection, subtract the peak height of the blank control from the average peak height of the sample, and then check the acetic acid content and retention time from the standard curve for qualitative analysis.
A6 Calculation
Where: X--Acetic acid concentration in air, mg/m2; GB16233--1996
x×2 000
is the acetic acid content of the samples taken from the desorption liquid of the front and rear activated carbon, ug; ((2-----
injection volume..;
sample volume under standard conditions, I.
A7 Description
（A1)
A7.1 The detection limit of this method is 7×10-2pg (injection of 2μL liquid sample). When the acetic acid concentration is 1.0, 2.0, and 4.0μg/2μL, the coefficient of variation is 6.4%, 2.5%, and 3.1%, respectively. A7.2 After the activated carbon tube collects acetic acid and desorbs it with formic acid, its desorption efficiency The penetration capacity is 79.6% to 97.0%. When the concentration in the air is 36.6 mg/m3, its penetration capacity is 2.4 mg/100 mg activated carbon. A7.3 Acetic acid is relatively stable on activated carbon, and its recovery rate is still 92.7% after being stored for 14 days. Additional notes:
This standard is proposed by the Ministry of Health of the People's Republic of China. This standard was drafted by the Anhui Provincial Institute of Occupational Disease Prevention and Control and the Liaoning Provincial Institute of Labor Hygiene. The main drafters of this standard are Wang Hongbo, Wang Xin, and Liu Jishan. This standard is interpreted by the Institute of Labor Hygiene and Occupational Diseases, Chinese Academy of Preventive Medicine, which is the technical management unit entrusted by the Ministry of Health. 538
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