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Accurate sulfur determination of coal using double-pulse laser-induced breakdown spectroscopy

Abstract

Sulfur accurate determination plays a vital role in the evaluation of coal quality. In this work, double-pulse laser-induced breakdown (DP-LIBS) in helium atmosphere was presented and applied in the sulfur concentration quantification of coal. The ablation plasma generated from the sample surface by the first laser (Nd: YAG laser at 1064 nm, 50 mJ/pulse) was re-excited orthogonally by the second laser pulse (Nd: YAG laser at 1064 nm, 120 mJ/pulse). The intensity of sulfur spectral lines has been enhanced with DP-LIBS and the interference from O I 926.6 has been weakened in helium atmosphere. The calibration curves of S I 921.3 nm, S I 922.8 nm and S I 923.8 nm have been established for 10 coal samples with S concentrations range from 0.28 wt.% to 4.01 wt.%. The best result was achieved with R2 = 0.992, LoD = 0.038 wt.%, RMSECV = 0.143 wt.%. The overall results adequately demonstrate that the DP-LIBS combine with helium atmosphere has excellent analytical performance for sulfur determination in coal and enormous potential for on-line detection in coal industry.

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Article information


Submitted
30 Dec 2019
Accepted
15 May 2020
First published
16 May 2020

J. Anal. At. Spectrom., 2020, Accepted Manuscript
Article type
Paper

Accurate sulfur determination of coal using double-pulse laser-induced breakdown spectroscopy

Y. Ma, W. Zhang, X. Zhang, H. Cui, Q. Li, R. Zhou, Y. Zhang, X. Li, X. Zeng and Q. Li, J. Anal. At. Spectrom., 2020, Accepted Manuscript , DOI: 10.1039/C9JA00448C

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