Donnish Journal of Pure and Applied Chemistry

November 2018 Vol. 4(1), pp. 001-006

Copyright © 2018 Donnish Journals

Original Research Paper

Simultaneous Determination of Cadmium and Zinc in Environmental Samples by Anodic Stripping Voltammetry

Nikolay Zaitsev^a, Dencho Stanev^b, Krasimira Stancheva^b*, Viktoria Trifonova^b, Veska Shivacheva^b and Hristivelina Jecheva^b

^aDepartment of Chemistry, Moskow State University, Leninskie Gory, Moskow, 119899, Russia.
^bDepartment of Inorganic and Analytical Chemistry, "Prof. Dr. Assen Zlatarov" University, 8010, Bourgas, Bulgaria.

Corresponding Author E-mail: krasimiraangelova@abv.bg

Accepted 7th November, 2018.

Abstract

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The concentrations of Cd and Zn metal ions in various environmental samples were simultaneously determined with anodic stripping voltammetry technique at mercury-film electrode. The stripping peaks were obtained at -600 to -700 mV for cadmium(II) and at -900 to -1100 mV for zinc(II), supporting electrolyte 0.1 M HNO3. The concentrate was stripped by changing the potential from -1400 to +200 mV, at a potential sweep rate 25 mV/s. Under the optimum experimental conditions, the calibration curves for Cd and Zn ions were obtained in the linear range of 0.5-400 ppb and 0.5-500 ppb, respectively. The detection limits and quantitation limits are as follow: for Cd 0.67 µg/L and 2.23 µg/L, and for Zn 0.56 µg/L and 1.86 µg/L. The proposed method has a good reproducibility and was successfully applied to the determination of Cd(II) and Zn(II) in drinking, lake and sea waters, sea lye and sea salt. The concentrations of metals determined are lower than the international permissible limits and there is no health-threatening concern due to the consumption of water and sea salt in this region.

Keywords: Voltammetry, Cadmium and Zinc determination, Environmental waters, Sea lye and sea salt.

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Cite This Article:

Nikolay Zaitsev, Dencho Stanev, Krasimira Stancheva, Viktoria Trifonova, Veska Shivacheva and Hristivelina Jecheva. Simultaneous Determination of Cadmium and Zinc in Environmental Samples by Anodic Stripping Voltammetry. Donnish Journal of Pure and Applied Chemistry 4(1) 2018 pp. 001-006.