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. 2016 Jul 13;16(7):1082. doi: 10.3390/s16071082

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© 2016 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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The temporal change of retrieved SO₄²⁻concentrations detected by a Raman spectral system. (C-SO₄²⁻, retrieved SO₄²⁻ concentration; AVG, the average of SO₄²⁻ during the day). The data between 16:12–20:30 were missing due to power off.