Instrument coupled speciation measuring method of gaseous arsenic compound

Abstract

The invention relates to an instrument coupled speciation measuring method of a gaseous arsenic compound, solving the problems of sensitive, fast and accurate analysis and measurement of the gaseousarsenic compound. The method is carried out on a gaseous arsenic compound analyzing and measuring on-line coupled system comprising a standard generation or sample collection device, a low-temperaturetrapping device, a vacuum heat-insulation separating tank, a gas-carried pipeline, a hydrogen generation device, an atomic fluorescence spectrometer and a signal recording device and comprises the following steps: a, generating an arsenic compound or collecting samples; b, trapping and separating the gaseous arsenic compound; c, separating the gaseous arsenic compound; and d, detecting the gaseous arsenic compound. The invention has the advantages of ideal separating effect on the gaseous arsenic compound, good reproducibility, high sensitivity, good linear independence of the gaseous arseniccompounds with different concentrations, wide linear range, good stability, low cost, simple operation and low analysis cost.

Description

technical field [0001] The invention relates to a compound analysis and determination method, especially for the volatile gaseous arsenic compound AsH 3 , CH 3 H 2 , (CH 3 ) 2 AsH, (CH 3 ) 3 The analysis and determination of As belongs to the technical field of chemical detection and analysis. Background technique [0002] Arsenic is a highly toxic environmental pollutant. A large amount of arsenic is released into the environment during industrial production and geological movements, endangering human health. These inorganic arsenic or organic arsenic compounds released into the environment can generate different forms of inorganic and organic arsenic compounds through a series of physicochemical and biological processes. Among them, arsenic can be transformed into more toxic gaseous arsenic compounds in the process of biogeochemical cycle, which has attracted people's attention recently. Compared with soluble arsenic compounds, gaseous arsenic compounds are not onl...

AI Technical Summary

Problems solved by technology

Although the detection sensitivity of gas chromatography-inductively coupled plasma mass spectrometry has been greatly improved compared with gas chromatography-mass spectrometry, the instrument is expensive, the operation is complicated, and the operating conditions are high, which is not conducive to popularization and application.

In short, most of the existing arsenic speciation analysis methods cannot meet the separation and analysis of gaseous arsenic compounds. In the field of gaseous arsenic compound speciation analysis technology, there is still a lack of speciation separation and analysis technology and online analysis and detection combined system for gaseous arsenic compounds, and its sensitivity is difficult to meet Sample Analysis Requirements

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