Experimental condition optimization of laser-induced breakdown spectroscopy based on sequential test

The trace mercury in aqueous solution is determined by laser-induced breakdown spectroscopy (LIBS) under the assistance of solution cathode glow discharge (SCGD) system. The aqueous solution is converted to gas phase using high voltage DC discharge, and then the generated mercury vapor is cooled by gas-liquid separator to improve the concentration of mercury. Finally, a 1064 nm wavelength Nd: YAG laser is used to produce plasma. In the present experiment, the characteristic spectral line of Hg I 253.65 nm is selected for analysis, under the optimal conditions of LIBS, the influences of the acid anion, discharge current, sample flow rate and carrier gas flow rate are investigated. The temporal behavior of the electron temperature and electron number density are also investigated, the results show that the electron temperature decreases from about 10900 K to 8800 K with delay time from 200 ns to 6 μs, and the electron number density is on the orders of 10 17 and 10 18 cm -3 , and it decreases with delay time. The analytical performances of this method are evaluated under optimized conditions, the calibration curve of Hg is plotted based on the different concentrations measurement results, and the detection limit (LOD) of Hg is calculated to be 0.36 mgL -1 . By using this experimental configuration, the detection limit and sensitivity of Hg are improved to some extent. This method provides an alternative analytical method for measurement of trace mercury in water.

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Online mercury determination by laser-induced breakdown spectroscopy with the assistance of solution cathode glow discharge

Zheng

Liu

Wang

et al. 2015

J. Anal. At. Spectrom.

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Experimental condition optimization of laser-induced breakdown spectroscopy based on sequential test

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Online mercury determination by laser-induced breakdown spectroscopy with the assistance of solution cathode glow discharge

Online mercury determination by laser-induced breakdown spectroscopy with the assistance of solution cathode glow discharge

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