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. 2022 Jul 19;22(14):5367. doi: 10.3390/s22145367

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Examples of cyclic square wave voltammograms and the dose–response of heavy metal salts in seawater between 0 to 3 ppm. (A) CdCl₂ at oxygen modified multilayer EG. (B) CuSO₄ at unmodified multilayer EG. (C) HgCl₂ at unmodified hydrogen-intercalated QFS bilayer EG. (D) PdCl₂ at oxygen modified hydrogen-intercalated QFS bilayer EG.