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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/).
(a) Effect of varying the Cd2+ ion concentration. (b) Linear plot of current response against Cd2+ concentration. (c) Repeatability test. (d) Reproducibility test. (e) The effect of interferents on current response. (f) The recorded response time.