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. 2019 Apr 9;19(7):1685. doi: 10.3390/s19071685

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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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Linear sweep voltammetries (LSVs) at screen-printed carbon electrodes (SPCEs) using leaching Ag solution (LS(Ag)) (A) and standard Ag solution (SS(Ag)) (B) solutions at different silver concentrations, with scan potential from 0 to −1.0 V at 50 mV s⁻¹. Insets show the peak current densities of the first cathodic peak (∼−0.2 V) against silver nitrate concentration.