Wavelet-based interference correction for laser-induced breakdown spectroscopy

Y. M. Guo, L. M. Deng, X. Y. Yang, J. M. Li, K. H. Li, Z. H. Zhu, L. B. Guo, X. Y. Li, Y. F. Lu, X. Y. Zeng

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

To minimize the impact of spectral interference on laser-induced breakdown spectroscopy (LIBS) quantitative analyses, an algorithm based on wavelet transform was developed for simultaneous correction of spectral interference and continuum background. The root-mean-square error of calibration (RMSEC) of the univariate regression model for the element of interest was applied to determine the wavelet function, decomposition level, and scaling factor α. When the interference-free analytical lines of the elements of interest cannot be directly obtained from the measured spectra, they can be extracted from the spectra with the developed method for quantitative analysis. This method was applied for LIBS analyses of chromium (Cr), silicon (Si), titanium (Ti), and manganese (Mn) with continuum backgrounds and spectral interference in low alloy steel samples. The root-mean-square errors of cross-validation (RMSECV) of elements Cr, Si, Ti, and Mn were 0.0295, 0.0140, 0.0183, and 0.0558 wt%, respectively. The results demonstrated that the developed algorithm contributed to accuracy improvement for LIBS quantitative analyses with the presence of spectral interference.

Original languageEnglish (US)
Pages (from-to)2401-2406
Number of pages6
JournalJournal of Analytical Atomic Spectrometry
Volume32
Issue number12
DOIs
StatePublished - Dec 2017
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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