An electrochemical sensor for the determination of Cd(II) using a modified gold electrode with organic-inorganic hybrid polyoxotungstate

Currently, environmental pollution by heavy metals is a global problem. Therefore, it is crucial to develop effective detection techniques to determine the levels of heavy metal contamination in various mediums [1]. Voltammetry is a highly sensitive electrochemical method used for the detection of heavy metal ions [1-3]. In this study is developed an electrochemical sensor based on a gold electrode modified with a kind of inorganic– organic hybrid polyoxometalate (POM) and used for the determination ofCd2+ by square wave voltammetry (SWV). [(L-Cys)3PW12O40] has been prepared by solvent free reaction at room temperature and structurally characterized by an elemental analysis, FT-IR spectroscopy and UV-Vis absorption spectroscopy. The conditions for the prepared electrode were optimized. Under optimal conditions, the SWV peak currents showed good linear relationships with Cd2+ concentrations in the range of 1.0– 200.0 μM with detection limits of 800 nM (S/N = 3) (Fig.1).