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

1 - Department of Chemistry Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran

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

Keywords: Voltammetric method, Hg2+ ion, Modified electrode, Electrochemical Sensor,

Abstract :

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.

References:

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.