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. 2020 Aug 18;10(8):1620. doi: 10.3390/nano10081620

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© 2020 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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(a) Square wave anodic stripping voltammograms of Cd²⁺ and Pb²⁺ 200 ppb obtained by GP_naf_ex_Bi, GP_Bi and GP_naf_Bi electrodes; (b) square wave anodic stripping voltammograms of Cd²⁺ and Pb²⁺ 12.5 and 5 ppb obtained by GP_Bi and GP_naf_ex_Bi at pH 4.5, pulse height 75 mV, step 2 mV and frequency 2 Hz.