Method for determining content of bromomethane in occupational health

Abstract

The invention discloses a method for determining the content of bromomethane in occupational health. The determination method comprises the following steps: 1, preparing a bromomethane standard curve; 2, collecting bromomethane in air to active carbon through a sampling device; 3, disposing the bromomethane-enriched active carbon under closed conditions overnight to balance bromomethane; 4, desorbing bromomethane adsorbed in the active carbon with 1ml of an organic solvent; and 5, quantitatively analyzing bromomethane in the organic solvent by using a gas chromatograph. The determination method has the following advantages: the desorption efficiency is high; an active carbon tube has a small size and is easy to carry and store, and the sampling volume changes as needed; the storage time is long, and reaches up to 5-7d; a desorbed solvent desorption bottle can be disposed on an automatic sampler, so large-scale automatic sample introduction analysis can be easily realized; and a detector is changed to an electron capture detector, so the sensitivity is improved by several orders of magnitudes, and the analysis reliability is improved.

Description

technical field [0001] The invention belongs to the field of testing and analysis, in particular to a method for measuring the content of methyl bromide in occupational hygiene. Background technique [0002] With the rapid development of industrial technology, more and more toxic and harmful substances are produced, which seriously threaten people's health and ecological environment. Some workers who have been exposed to certain toxic and harmful substances for a long time are prone to occupational diseases. For example, excessive exposure to silicon dioxide can easily lead to silicosis, excessive exposure to benzene can easily lead to leukemia, etc.; Earth ecological environment. The famous "Minamata disease" incident in Japan is a public nuisance disease caused by mercury pollution from industrial wastewater discharge. With the improvement of living standards and public health awareness, these problems have received more and more attention. How to establish a fast and ac...

AI Technical Summary

Problems solved by technology

[0007] (3) Manual injection is required for direct injection, increasing the workload of analysts;

[0008] (4) The hydrogen flame ionization detector is sampled in the national standard. The sensitivity of this kind of detector is relatively low, and it is difficult to detect the characteristic gas with a small content. However, the "Occupational Exposure Limits of Hazardous Factors in the Workplace-Chemical Hazardous Factors" (GBZ2. 1-2007), the time-weighted average allowable concentration of methyl bromide PC-TWA 2 mg / m 3 (percutaneous), and its short-term exposure tolerance PC-STEL needs to be multiplied by a factor of 2.5, which is 5mg / m 3 , the hydrogen flame ionization detector of general gas chromatography is difficult to meet this requirement