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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 (https://creativecommons.org/licenses/by/4.0/).
XRS spectra of the samples of river water (collected at point “A”), brackish water (collected at point “F”), and seawater (collected at point “f”). (a) The whole spectra; (b) an enlarged view.