Journal de la métallurgie des poudres et des mines

Abstrait

Electrochemical Chelation of Heavy Metals by 2-Benzimidazole

Charaf L, Madiha E, Hind S, Amine SM, Jihane E and Chtaini A*

The performance of carbon paste electrodes modified with 2-Benzimidazole Thiol (BIT) was investigated as a modified electrode for the determination of lead. 2-Benzimidazole was developed and introduced as a new modifying agent for heavy metal chelation. The physical parameters that could influence the current densities were investigated and optimized. The prepared electrode showed a good linear response to lead ions in the different concentrations, the detection limit was 2,77.10^-9 mol/l. The behavior of Pb²⁺ is studied by Square Wave Voltammetry (SWV), Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). Three peaks of oxidation of Pb²⁺ are observed successively at -0.7 V, -0.5 V and -0.42 V, the peak of reduction occurs at +0.43 V. The interference effect was studied.