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Issue 12, 2018
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Influence of baseline subtraction on laser-induced breakdown spectroscopic data

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Spectra acquired by laser-induced breakdown spectroscopy comprise both a valuable analyte signal and an undesired background signal originating from various sources. The latter is commonly suppressed, at least partially, by gating of the signal acquisition, or treated numerically during the data processing. The numerical treatment might lead to loss of information or introduction of spectral artefacts, depending on the applied methodology. Consequently, background subtraction might significantly influence both univariate and multivariate analysis of the LIBS data. While various baseline correction methods have recently been studied and compared for multivariate LIBS analysis, their influence on LIBS data remains unexplored. Therefore, the present work aims to elucidate the effects of numerical background estimation and subtraction on LIBS data in terms of limits of detection estimated by the signal-to-noise ratio method, considering several fundamentally different background estimation algorithms: polynomial fitting, heuristic estimation, wavelet smoothing, and non-parametric modelling. A threshold gate delay value was observed above which the numerical treatment of spectral background has to be done cautiously. In addition, it was found that the optimal measurement parameters and selection of the emission line yielding the best results depend on the planned spectral processing.

Graphical abstract: Influence of baseline subtraction on laser-induced breakdown spectroscopic data

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Publication details

The article was received on 19 Jun 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018

Article type: Paper
DOI: 10.1039/C8JA00209F
Citation: J. Anal. At. Spectrom., 2018,33, 2107-2115

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    Influence of baseline subtraction on laser-induced breakdown spectroscopic data

    E. Képeš, P. Pořízka, J. Klus, P. Modlitbová and J. Kaiser, J. Anal. At. Spectrom., 2018, 33, 2107
    DOI: 10.1039/C8JA00209F

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