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Evaluation of the Calibration-Free and Multivariate Method for Quantitative Analysis in Laser-Induced Breakdown Spectroscopy
Abstract
The calibration-free laser-induced breakdown spectroscopy (CF-LIBS) method is used to obtain the concentration of the constituents of samples because it overcomes the limitation of matrix-matched standards in the calibration curve method of quantification. However, there are often doubts that remain about the efficiency of the CF-LIBS method. Hence, in the present work, different certified reference materials (CRMs) of plants and soil were employed to check the capabilities of the CF-LIBS method. If the emission lines of an element are missing in the LIBS spectra, its contribution in the CF-LIBS result will be missing as well, which leads to incorrect quantification. Therefore, in order to overcome this problem in CF-LIBS, instead of only determining the elemental concentrations, an additional step to calculate the concentration ratio of all elements with respect to the concentration of a major element was added. The calculated concentration ratios for different elements are more accurate than the elemental concentration obtained by CF-LIBS. Along with the CF-LIBS method, the partial least square regression (PLSR) approach was also applied for the prediction of the concentration.
Keywords
calibration-free laser-induced breakdown spectroscopy,
certified reference materials,
analytical accuracy,
partial least square regression
Supporting agencies: UGC-BSR project No. F.30-461/2019(BSR) is acknowledged for the startup grant. The Board of Research in Fusion Science and Technology (BRFST), Institute for Plasma Research, Gandhinagar, Gujarat, India is also gratefully acknowledged for financial assistance under Project No. “NFPDIAG-F11-03”. GSM is thankful to the Indian Institute of Technology, Kanpur for providing financial assistance as an institute postdoctoral fellowship (PDF98).
About the Authors
R. Kumar
Department of Physics, Chaudhary Mahadeo Prasad College at University of Allahabad
India
India
Prayagraj, 211002.
G. S. Maurya
Ultrafast Spectroscopy Lab., Department of Chemistry, Indian Institute of Technology Kanpur
India
India
Kanpur, 208016.
A. Devanathan
Fuel Chemistry Division, Bhabha Atomic Research Center
India
India
Mumbai, 400085.
A. K. Rai
Laser Spectroscopy Research Laboratory, Department of Physics at University of Allahabad
India
India
Prayagraj, 211002.
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Review
For citations:
Kumar R., Maurya G.S., Devanathan A., Rai A.K. Evaluation of the Calibration-Free and Multivariate Method for Quantitative Analysis in Laser-Induced Breakdown Spectroscopy. Zhurnal Prikladnoii Spektroskopii. 2021;88(3):462-470.
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