Analysis of the heavy metals in atmospheric particulate matter using dual-pulsed laser-induced breakdown spectroscopy

Li Yeqiu; Sun Chenglin; Li Qian; Dai Qin; Wu Rina; Zhang Shanchun; Yang Fan; Qiao Hongchao

doi:10.3788/IRLA201948.1005006

In order to study the spectral characteristics of heavy metal plasma in the atmosphere near an industrial zone in Shenyang, double pulse laser-induced breakdown spectroscopy (DP-LIBS) was used to measure and analyze the characteristics of main heavy metal laser-induced breakdown spectra in the atmosphere. By comparing the plasma spectrum of samples excited by single pulse (SP) and double pulse (DP). It was found that DP-LIBS can enhance the intensity of plasma spectrum. The DP-LIBS spectral intensity with the interval time of two pulsed lasers was studied, and the maximum enhancement of the heavy metal plasma spectrum was obtained when the pulse interval was 15 s. At the same time, the DP-LIBSs technology will also improve the stability of the sample plasma spectrum, and the relative standard deviation of the spectrum line will be reduced from 6% to about 3%. Finally, the changes of electron temperature and electron density with the time interval of double pulse were studied.

Analysis of the heavy metals in atmospheric particulate matter using dual-pulsed laser-induced breakdown spectroscopy

1. College of Science,Shenyang Ligong University,Shenyang 110159,China;

2. Coherent Light and Atomic and Molecular Spectroscopy Laboratory,Jilin University,Changchun 130012,China;

3. Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China

Received Date: 2019-06-11

Rev Recd Date: 2019-07-21

Publish Date: 2019-10-25

Key words:

Abstract: In order to study the spectral characteristics of heavy metal plasma in the atmosphere near an industrial zone in Shenyang, double pulse laser-induced breakdown spectroscopy (DP-LIBS) was used to measure and analyze the characteristics of main heavy metal laser-induced breakdown spectra in the atmosphere. By comparing the plasma spectrum of samples excited by single pulse (SP) and double pulse (DP). It was found that DP-LIBS can enhance the intensity of plasma spectrum. The DP-LIBS spectral intensity with the interval time of two pulsed lasers was studied, and the maximum enhancement of the heavy metal plasma spectrum was obtained when the pulse interval was 15 s. At the same time, the DP-LIBSs technology will also improve the stability of the sample plasma spectrum, and the relative standard deviation of the spectrum line will be reduced from 6% to about 3%. Finally, the changes of electron temperature and electron density with the time interval of double pulse were studied.

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Reference (11)

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Analysis of the heavy metals in atmospheric particulate matter using dual-pulsed laser-induced breakdown spectroscopy

doi: 10.3788/IRLA201948.1005006

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