Research on LIBS quantitative analysis of heavy metal concentration in polluted water-based on Fourier self-deconvolution method

Yuanhang Wang; Yang Bu; Fang Wu; Yi Cao; Yingjie Yu; Xiangzhao Wang

doi:10.1117/12.2544699

18 December 2019 Research on LIBS quantitative analysis of heavy metal concentration in polluted water-based on Fourier self-deconvolution method

Yuanhang Wang, Yang Bu, Fang Wu, Yi Cao, Yingjie Yu, Xiangzhao Wang

Author Affiliations +

Proceedings Volume 11337, AOPC 2019: Optical Spectroscopy and Imaging; 113370P (2019) https://doi.org/10.1117/12.2544699
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

Laser-induced breakdown spectroscopy (LIBS)is a real-time and rapid analysis method, which can realize quantitative analysis of element concentration in solid, liquid or gaseous samples. In this paper, a micro-LIBS system was designed for the quantitative analysis of heavy metals concentration in polluted water. The composition of the elements in the polluted water is abundant. Therefore, the characteristic spectral lines of heavy metal elements in polluted water are easy to be overlapped with adjacent characteristic spectral lines due to the spectral line broadening. This paper introduces the Fourier self-deconvolution (FSD) method to solve the problem of characteristic spectral overlap in LIBS quantitative analysis of heavy metals in polluted water. Fourier self-deconvolution (FSD) can decrease the spectral linewidth by taking deconvolution on the spectral using the shape information of the spectral itself. By combining the FSD with other methods such as baseline removal, wavelet domain denoising, spectral normalization and outlier discarding, the LIBS detection limit of Pb concentration in polluted water can reach 79.66 ppm.

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Yuanhang Wang, Yang Bu, Fang Wu, Yi Cao, Yingjie Yu, and Xiangzhao Wang "Research on LIBS quantitative analysis of heavy metal concentration in polluted water-based on Fourier self-deconvolution method", Proc. SPIE 11337, AOPC 2019: Optical Spectroscopy and Imaging, 113370P (18 December 2019); https://doi.org/10.1117/12.2544699

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KEYWORDS

Lead

Laser induced breakdown spectroscopy

Metals

Quantitative analysis

Chemical elements

Liquids

Plasma

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