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. 2019 Nov 28;19(23):5244. doi: 10.3390/s19235244

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Mass fraction of Ca predicted by LIBS univariate calibration based on standard addition (w_Ca,LIBS) compared to reference values obtained by ICP-OES upon aqua regia extraction (w_Ca,ref) for the first field, R² = 0.91, (b) deviation of predicted from reference value sorted by sample number.