https://doi.org/10.15255/KUI.2021.046
Published: Kem. Ind. 71 (3-4) (2022) 171–176
Paper reference number: KUI-46/2021
Paper type: Original scientific paper
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Electrochemical Detection of Lead Ions by 2-Benzimidazolethiol-modified Carbon Paste Electrode Prepared by Inset Modification: A Voltammetric Study

S. Touzara, J. El Mastour, A. Amlil and A. Chtaini

Abstract

In this work, an electrochemical sensor was prepared by modifying a carbon paste with the organic molecule of 2-benzimidazolethiol (CPE/OM) by mixing methods (by combination of the organic molecules and the carbon electrode). The sensor was tested for detection of lead ions in an aqueous solution. All reactions studied took place on the modified electrode surface, the place of contact between the electrode and the electrolytic medium. For this reason, the electrochemical properties of the CPE/OM, including cyclic voltammetry and square wave voltammetry techniques, were used. Cyclic voltammetry studies have indicated the reaction involved. The determination of lead was carried out utilising the voltammetric technique at the surface of the modified electrode, and the correlation between the current of peak oxidation and the concentration of this ion showed a detection limit (DL) of 3.43 ∙ 10^–6 mol l^–1. The experimental results proved that the carbon paste electrode modified with 2-benzimidazolethiol had high sensitivity toward lead ions and a wide linearity range.

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Keywords

cyclic voltammetry, heavy metals, organic molecular, sensor, modified electrode