Heavy metals in the atmosphere determination by double-pulse laser induced breakdown spectroscopy

D. L. Qi,D. Y. Cui,Y. L. Qin,G. P. Zhao,H. D. Li

doi:10.1063/5.0063820

D. L. Qi, D. Y. Cui + Show 3 more

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https://doi.org/10.1063/5.0063820

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Journal: AIP Advances	Publication Date: Feb 1, 2022
Citations: 2	License type: cc-by

Affiliation: Shenyang Ligong University

Abstract

In this paper, the double-pulse laser-induced breakdown spectroscopy (DP-LIBS) technique was used to analyze the heavy metal samples collected in the atmosphere using an air sampler. The enhancement characteristics of the plasma spectra were studied by using different laser wavelength combinations with 1064, 532, and 355 nm Nd:YAG lasers. The plasma spectrum of the sample was greatly enhanced when the combined laser wavelengths were 355 and 1064 nm. On this basis, the optimal inter-pulse delay time is obtained to get the maximum plasma spectrum. The relationship of the signal to background ratio, electron temperature, and electron density of the plasma spectrum with inter-pulse delay and acquisition delay is also discussed. Finally, the optimal pulse delay and acquisition time were obtained. DP-LIBS technology can effectively improve the detection effect of heavy metals in the atmosphere, which is a very promising tool in the field of environmental monitoring.

Highlights

In recent years, with the development of industry, urban air pollution has become an increasingly serious problem
The double-pulse laser-induced breakdown spectroscopy (DP-LIBS) technique was used to analyze the heavy metal samples collected in the atmosphere using an air sampler
Many studies have shown that atmospheric particulate pollution has become the main factor of air pollution

Summary

Introduction

With the development of industry, urban air pollution has become an increasingly serious problem. Many studies have shown that atmospheric particulate pollution has become the main factor of air pollution.. The composition of atmospheric particles is very complex, usually containing acidic organic matter, heavy metals, industrial dust, flue gas, bacteria, and so on.. The sources of atmospheric particulate matter can be divided into natural pollution and man-made pollution, and industrial pollution is the main part of man-made pollution.. The types and contents of heavy metal elements in atmospheric particulate matter are important factors affecting bioavailability. The heavy metal elements from manmade pollution sources are more likely to be enriched in PM2.5.8,9 Monitoring the source of major pollutants is the main means to control the emission of air pollution, so it is necessary to monitor the gas produced by combustion in factories.

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