Method for determining content of boron and compounds thereof in air of workplace

Abstract

The invention discloses a method for determining the content of boron and compounds thereof in air of a workplace. The method comprises the following steps: collecting an air sample in the workplace by adopting a porous glass plate absorption tube with a sodium hydroxide absorption liquid provided therein; pouring the sample collected absorption liquid sample into a beaker, adjusting the absorption liquid sample to neutrality by using diluted nitric acid, adding two droplets of hydrogen peroxide, transferring the obtained sample to a boron-free glass volumetric flask, and adding nitric acid to maintain the acidity of the absorption liquid; and analyzing and determining the boron content of the absorption liquid sample by using a plasma spectrum analyzer, and calculating the boron content of borane, diborane, pentaborane and boron trifluoride in the workplace according to the boron concentration in the absorption liquid and the collecting volume. The method has the advantages of simplicity, fastness, high efficiency, strong interference resistance, high sensitivity and precision, and avoiding of harms of boron and the compounds thereof in air of the workplace to the health of bodies of workers through realizing synchronous synthesis and determination of the content of various harmful compounds of boron in the workplace.

Description

technical field [0001] The invention relates to a method for determining the content of boron and its compounds in the air of a workplace. Background technique [0002] Boron is a chemical raw material mineral with a wide range of uses. It is mainly used to produce borax, boric acid and various compounds of boron as well as elemental boron. It is an important raw material in metallurgy, building materials, machinery, electrical appliances, chemicals, medicine and other industries. , ceramics, detergents and agricultural fertilizers, among which borax and boric acid are the most important products. At present, the absorption and metabolism characteristics of boron are not fully understood by the scientific community. In fact, boron is easily absorbed by the human body and slowly enriched. Now the boron compounds listed as occupational hazard factors mainly include borane, diborane, and pentaborane. And boron trifluoride, after the human body inhales these compounds, it often...

AI Technical Summary

Problems solved by technology

[0004] The spectrophotometric method used in this determination method has the limitations of large matrix interference and low detection limit, and only analyzes boron trifluoride in boron and its compounds, and cannot cover other forms of boron and its compounds, including Basically harmless borax, boric acid, and boron compounds such as borane, diborane, and pentaborane, which are listed as occupational hazard factors, cannot be analyzed and determined. It is very unfavorable and cannot meet the requirements of occupational health management

Images