Ultrasensitive Simultaneous Quantification of Nanomolar Level of Cd and Zn by Cathodic Adsorptive Stripping Voltammetry in Some Real Samples |
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Authors: | Shahryar Abbasi Abbas Farmany Seyede Shima Mortazavi |
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Affiliation: | 1. Department of Chemistry, Ilam University, Ilam, Iran;2. Islamic Azad University, Hamedan Branch, Young Researchers Club, Hamedan, Iran |
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Abstract: | A novel, simple and sensitive adsorptive stripping voltammetry method was developed for simultaneous determination of Cd and Zn using N‐Nitrozo‐N‐phenylhydroxylamine (Cupferron) as a selective complexing agent. Cadmium and zinc metals gave peaks that were distinctly separated by 450–1200 mV, allowing their determination over a wide range of concentrations. The influence of pH and the nature of supporting electrolytes, concentration of ligand, preconcentration time and applied potential were investigated. The detection limits were 0.058 ng/mL for Zn and 0.092 ng/mL for Cd, and the RSD at a concentration level of 50 ppb, were 1.8–2.1 % for both zinc and cadmium, respectively. The method was applied to the determination of cadmium and zinc in blood, drug, food and water samples with the satisfactory results. |
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Keywords: | Simultaneous determination Adsorptive stripping voltammetry N‐Nitrozo‐N‐phenylhydroxylamine Real sample analysis Nanomolar level |
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