GB 16183-1996 Hygienic standard for thallium in workshop air

This standard specifies the maximum permissible concentration of thallium and its compounds in the air of a workplace and the monitoring and testing methods. This standard is applicable to all types of enterprises that produce and use thallium and its compounds. GB 16183-1996 Health Standard for Thallium in Workshop Air GB16183-1996 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Health standard for thallium in the air of workplace
Health standard for thallium in the air of workplaceSubject content and scope of application
GB16183-1996
This standard specifies the maximum permissible concentration of thallium and its compounds in workplace air and the blue test method. This standard applies to all types of enterprises that produce and use thallium and its compounds. 2 Hygiene requirements
The maximum permissible concentration of thallium in workplace air (in thallium) is 0.01mg/m (skin). 3
Monitoring and testing methods
The monitoring and testing methods of this standard adopt the stone furnace atomic absorption method, see Appendix A. 4 Supervision and implementation
Labor health and occupational health prevention agencies at all levels and health and epidemic prevention agencies at all levels are responsible for supervising the implementation of this standard. Approved by the State Administration of Technical Supervision on April 3, 1996, and implemented on September 1, 1996
A1 Principle
GB16183-1996
Appendix A
Determination of thallium in air by atomic absorption method
(Supplement)
Use the single chromatographic line of the thallium hollow cathode lamp to be absorbed by atoms in the graphite furnace atomizer, and determine its spectral line intensity and compare it with the standard sample for quantitative determination.
The minimum detection concentration of this method is 10-2mg/m. A2 Instruments
A2.1 Atomic absorption instrument: Zeeman background correction graphite furnace atomic absorption instrument or chlorine lamp background correction graphite furnace atomic absorption instrument; hollow cathode lamp; non-pyrolytic graphite tube.
A2.2 Dust sampler.
A2.3 10mL centrifuge tube with stopper.
A2.449\Glass fiber filter paper.
A2.5 Adjustable micro-liquidator.
A3 Reagents
A3.1 Thallium carbonate or thallium sulfate, spectrally pure or analytically pure, use 5 mol/L nitric acid to make a stock solution of 1 mL 1 mg thallium, store in a refrigerator at 4C, and dilute with deionized water before analysis.
A3.2 Nitric acid, high-grade pure.
A4 Sampling
Install a single layer of glass fiber filter paper on the sampling head and collect air at a suction speed of 20 to 30 L/min for 20 to 30 minutes. Collect air samples at the pre-set sampling points, and record the temperature and air pressure conditions at the time and location. A5 Analysis steps
A5.1 Atomic absorption instrument parameters:
Wavelength 276.7 nm.
F-drying 80-120℃20s;120℃10s.
Ashing 120~300℃20s;300℃10s. Atomization 1800℃5s (gas off).
Heat removal 2400℃2s.
A5.2 Sample analysis
Fold the filter paper of the sample several times, put it into a 10mL centrifuge tube, dissolve it with 0.5mol/L nitric acid 5mL, shake it vigorously, shake the glass fiber filter paper thoroughly, let it stand for 3~5min, wait for the fiber to sink, take 25μL of the supernatant and inject it into the graphite tube. If the sample content is too high, it needs to be diluted before injection.
A5.3 Drawing of standard curve
Use 0.5mol/L nitric acid solution to dilute the thallium stock solution into a series of 0, 25, 50, 75, 100μg/L. Use a plastic adjustable micro-injector to draw 25 μl and inject it into the graphite tube. Repeat the same operation for seven days, merge the data, perform regression analysis on the concentration based on the absorbance value, and draw a standard curve for use when monitoring samples. 380
A6 Calculation
Where X-
-the concentration of thallium in the air, mg/m2;
GB16183-1996wwW.bzxz.Net
（————Concentration obtained from the standard curve, μg/I; K-sample dilution factor during injection;
V. —Volume of sample collected under standard conditions, L. A7 Precautions
A7.1 Carbide is a volatile element, so the temperature during ashing should not exceed 300°C, otherwise it will be lost. A7.2 Avoid using hydrochloric acid or perchloric acid during sample processing. Additional notes:
This standard was proposed by the Ministry of Health of the People's Republic of China. This standard was drafted by the Beijing Institute of Labor Hygiene and Occupational Disease Prevention and Control. The main drafters of this standard were Cui Mingzhen and Chen Zhenyang. (A1)
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. 381
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