Electroanalysis of Trace Amount Hg2+ Ion in Water Samples Using Sensor Co3O4-CeO2-ZnO/CPE and Square Wave Anodic Stripping Voltammetry (SWASV) Method

This study describes the construction of a new electrochemical sensor and applies for determination of Hg2+ ion. This sensor was prepared using a new nanocomposite base on (Co3O4-CeO2-ZnO). Although the other methods (gas or liquid chromatographic, electrophoresis, flow injection) for measuring Hg2+ ion has advantages such as excellent accuracy and reproducibility, it has limitations such as long-time measure, high equipment cost. In this study, for determination Hg2+ ion we used a from sensor Co3O4-CeO2-ZnO/CPE and voltammetric method.  The calibration curve was linear in the range of (0.03 to 35.0 µgL−1). The standard deviation of less than (3%), and detection limits (3S/m) of the method (0.09 nM) for Hg2+ ion were obtained for the proposed electrochemical sensor by Co3O4-CeO2-ZnO/CPE with (95%) confidence evaluated. Finally, Co3O4-CeO2-ZnO/CPE has been successfully applied for the determination of Hg2+ ion in water samples. The method introduced to measure Hg2+ ion in water samples was used and can be used for other samples.