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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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Mass fraction of (a) Ca and (b) Fe predicted by LIBS univariate calibration based on standard addition compared to reference values obtained by ICP-OES upon aqua regia extraction for the second field, R² (Ca) = 0.60.