Method used for detecting atmospheric heavy metal pollutants based on laser-induced-breakdown spectroscopy

Abstract

The invention discloses a method used for detecting atmospheric heavy metal pollutants based on laser-induced-breakdown spectroscopy. According to the method, a vacuum pump is used for sample collection of atmosphere containing suspended particulate matters; a filtration device provided with a solid filter membrane is used for absorbing the suspended particulate matters in the atmosphere so as to form a relatively stable aerosol deposition layer on the solid filter membrane; the aerosol deposition layer comprises a plurality of solid particles and liquid particles suspended in the atmosphere; breakdown of the aerosol deposition layer on the solid filter membrane is realized via laser beam induction, and distribution and content information of heavy metal elements in atmospheric particulate pollutants is obtained via analysis on aerosol plasma spectrum signals. The method is capable of changing gas detection to solid detection, increasing emission intensity of laser plasma spectrums, prolonging plasma spectrum emission time, and increasing detection limit of heavy metal elements in the atmospheric particulate pollutants, and is suitable for analysis and detection of a plurality of heavy metal elements in gaseous states in the samples.

Description

technical field [0001] The invention relates to the field of laser spectrum analysis, in particular to a method for detecting atmospheric heavy metal pollutants based on laser-induced breakdown spectrum technology. technical background [0002] With the rapid development of industry and economy and the rapid increase of population, heavy metal pollution in the atmosphere has become one of the main pollutions faced by the world today, mainly from industrial production, motor vehicle exhaust, mining, boiler coal burning and automobile tire wear A large amount of harmful gases and dusts containing heavy metals are produced. Heavy metal pollutants are mainly attached to PM2.5 and PM10 particles. PM2.5 and PM10 refer to inhalable particulate matter with an aerodynamic equivalent diameter of less than or equal to 2.5 microns and 10 microns. These inhalable particulate matter have strong adsorption capacity. It is the "carrier" and "catalyst" of various pollutants including heavy ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for detecting atmospheric heavy metal pollutants based on laser-induced breakdown spectroscopy to solve the problem that existing laser-induced breakdown spectroscopy is usually only for solid samples, but it is difficult to detect gas samples

[0007] In order to solve the problem of complex and time-consuming technical procedures for detecting the content of heavy metal elements in the existing air pollution particles, the technical solution adopted in the present invention is:

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