Voltammetric Determination of Mercury (II) Ions in 5-Methoxy-2-({[4-(3-methyl-3-phenyl-cyclobutyl)-thiazol-2-yl]-Hydrazone}-Phenyl-Methyl)-Phenol Modified Glassy Carbon Electrode by Differential Pulse Voltammetry

The aim of this research is to design an electrochemical sensor for the determination of mercury (II) (Hg2+) ions. A new compound 5-methoxy-2-({[4-(3-methyl-phenyl-cyclobutyl)-thiazol-2-yl]-hydrazone}-phenyl-methylene) (MTP) phenol as a substituent on glassy carbon (GC) electrode is reported. The electrochemical behaviors of the new compound were examined by cyclic voltammetry (CV) before characterization of the modified electrode by CV, electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and scanning electron microscopy (SEM) techniques. Determination of trace amounts of Hg2+ ions using a modified electrode was carried out using differential pulse voltammetry (DPV). To obtain optimized results, the effect of medium acidity and incubation time were investigated. The best results are pH 10.0 and incubation time (90 min), using Britton-Robinson (BR) buffer solution as the supporting electrolyte in all measurements. Under these optimal conditions, the oxidation peak current of Hg2+ ions exhibited a linear increase corresponding to concentrations ranging from 5.0 to 20.0 µM and 50.0 to 200.0 mM. Limit of detection (LOD) and limit of quantification (LOQ) are equal to 1.12 and 3.39 µM, respectively.