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

Subject Areas : Journal of Physical & Theoretical Chemistry

Shahnaz  Davoudi ¹ (Department of Chemistry Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran)

Received: 2023-01-03 Accepted : 2023-02-03 Published : 2022-02-01

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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.