Investigation of excitation interference in laser-induced breakdown spectroscopy assisted with laser-induced fluorescence for chromium determination in low-alloy steels

Jiaming Li, Xiaochun Liu, Xiangyou Li, Qiongxiong Ma, Nan Zhao, Qingmao Zhang, Liang Guo, Yongfeng Lu

Research output: Contribution to journalArticle

Abstract

Chromium determination in steels suffered from excitation interference in laser-induced breakdown spectroscopy assisted with laser-induced fluorescence (LIBS-LIF). In this work, excitation interference between target chromium atoms and matrix iron atoms was investigated in detail. Relative absorption strength (RAS) of chromium and iron was mathematically deduced and utilized to estimate the excitation interference theoretically. Standard calibration curves of LIBS and LIBS-LIF for chromium determination in low-alloy steels were experimentally established. The chromium line 359.35 nm with less interference in the RAS map provided better analytical performance (slope of 1.99×105 counts/ wt%, detection limit of 8.64 μg g−1, R2 of 0.992, average RSD of 2.89%), in accordance with the theoretical estimation. This work realized sensitive and accurate determination of trace chromium in low-alloy steels, even influenced by excitation interference. An effective estimation method was provided for evaluating excitation interference to choose a suitable excitation line.

Original languageEnglish (US)
Article number105834
JournalOptics and Lasers in Engineering
Volume124
DOIs
Publication statusPublished - Jan 2020

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Keywords

  • Chromium
  • Excitation interference
  • Laser-induced breakdown spectroscopy
  • Laser-induced fluorescence
  • Steel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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