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. 2015 Apr 29;5(2):241–275. doi: 10.3390/bios5020241

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Schematic illustration of the procedures for preparing the Bi/Nafion/OPPy-MES/GCE for ASV analysis of Cd²⁺ and Pb²⁺ ions (not to scale). Reprinted from [90] with permission from Elsevier.