Analytical Sciences

Voltammetric Determination of Lead and Copper in Wine by Modified Glassy Carbon Electrode

Vesna ANTUNOVIC,*1 Tatjana TRIPKOVIC,*2 Biljana TOMAŠEVIC,*3 Rada BAOŠIC,*3 Dijana JELIC,*4 and Aleksandar LOLIC*3

*1 Department of Pharmacy, Faculty of Medicine, University of Banja Luka, Save Mrkalja 14, 78000 Banja Luka, Bosnia and Herzegovina
*2 Republic Institute for the Protection of Cultural Monuments of Serbia, Radoslava Grujica 11, 11000 Belgrade, Serbia
*3 Department of Analytical Chemistry, University of Belgrade-Faculty of Chemistry, Studentski trg 12-16, 11000 Belgrade, Serbia
*4 Department of Chemistry, Faculty of Natural Sciences and Mathematics, University of Banja Luka, Mladena Stojanovica 2, 78000 Banja Luka, Bosnia and Herzegovina

This paper describes the determination of Pb and Cu with a Nafion-modified glassy carbon electrode and MnCo₂O₄ nanoparticles as working electrode for anodic stripping voltammetry. Pb and Cu were accumulated in HCl/KCl (0.1 mol dm⁻³) at a potential of –1.4 V (vs. Ag/AgCl electrode) for 480 s, followed by a linear sweep anodic stripping voltammetry (ASV) scan from –1.0 to +0.5 V. Under optimum conditions, the calibration curves were linear in the range of 0.01 – 8 and 0.01 – 5 mg dm⁻³ for Pb and Cu, respectively. Effect of sample dilution, accumulation time and potential were optimized. A study of interfering substances was performed. A significant increase in current was obtained at the modified electrode in comparison with the bare glassy carbon electrode. The modified electrode was successfully applied for determination of Pb and Cu in wine samples after a simple preparation procedure. Pb and Cu content in wine was used for estimation of the target hazard quotient (THQ) values for minimal and maximal levels of the metals.

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