Simultaneous Electrochemical Detection of Pb and Cd by Carbon Paste Electrodes Modified by Activated Clay

Niraka Blaise; Hambate Gomdje Valéry; Raja Maallah; Mohamed Oubaouz; Bakary Tigana Djonse Justin; Edwin Andrew Ofudje; Abdelilah Chtaini

doi:10.1155/2022/6900839

Simultaneous Electrochemical Detection of Pb and Cd by Carbon Paste Electrodes Modified by Activated Clay

J Anal Methods Chem. 2022 Jan 19:2022:6900839. doi: 10.1155/2022/6900839. eCollection 2022.

Authors

Niraka Blaise¹, Hambate Gomdje Valéry¹, Raja Maallah², Mohamed Oubaouz², Bakary Tigana Djonse Justin¹, Edwin Andrew Ofudje³, Abdelilah Chtaini²

Affiliations

¹ National Advanced School of Engineering, University of Maroua, P.O. Box 46, Maroua, Cameroon.
² Team of Molecular Electrochemistry and Inorganic Materials, Faculty of Sciences and Technology, Sultan Moulay Slimane University of Beni Mellal, Beni Mellal, Morocco.
³ Department of Chemical Sciences, Mountain Top University, Prayer City, Ogun State, Nigeria.

Abstract

Calcinated and acidified clay modified carbon graphite electrode was deployed in the simultaneous evaluation of traces of Pb²⁺ and Cd²⁺ in solution. After 5 minutes of accumulation in the circuit, the sensitivity of the electrode was evaluated in a solution of Na₂SO₄ (0.1 M) by square wave voltammetry on the one hand with Pb (II) and on the other hand with Cd (II). Several experimental conditions such as the composition of the carbon clay paste, the effect of preconcentration time, the sweeping speed, concentration effect, media pH, and interference ionic response to the electrochemical response of the working electrode were examined. It was observed that, after 5 minutes of preconcentration, detection limits of 0.15513 μmol·L^-1 and 0.24227 μmol·L^-1 were obtained for Pb²⁺ and Cd²⁺ in the electrolyte solution and 0.08438 μmol·L^-1 and 0.46522 μmol·L^-1, respectively, when tap water was used. The detection was effective by square wave voltammetry with a more intense current density with respect to lead.