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. 2021 Feb 9;11:3413. doi: 10.1038/s41598-021-82741-z

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) CV of CuO/GCE in 0.1 M PBS (pH 7.0) containing 0.4, 0.8, 1.2, 2.0, 3.0, 5.0, 7.0, 10.0 and 15.0 mM of SO₃²⁻; (b) corresponding calibration curve (n = 3). (c) Differential pulse voltammogram of CuO modified electrode in 0.1 M PBS pH 7 concentration ranges from 0.2, 0.3, 0.5, 0.75, 1.0, 2.0, 3.0, 5.0, 7.0, 10.0 and 15.0 mM of SO₃²⁻. Insert shows the low concentration region and (d) a plot of current density with respect to the concentration (n = 3). (DPV parameters: step potential = 0.0050 V; modulation amplitude = 0.0250 V; modulation time = 0.20 s and interval time-0.5 s).