Simultaneous determination of trace amounts of nickel, cobalt, and zinc in the wastewater of a galvanic workshop by using adsorptive cathodic stripping voltammetry

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作者：
Rezaei, B. [1 ]
Rezaei, E. [1 ]
机构：
[1] College of Chemistry, Isfahan University of Technology, Isfahan, 84154, Iran
来源：
Journal of Analytical Chemistry | 2006年 / 61卷 / 03期
关键词：
Electroplating of Ni; Co; and Zn is widely used in the industry; because coating of tools with these materials can improve mechanical and chemical properties such as hardness; toughness; and corrosion resistively. Ni; and Zn are among toxic metals of significance for environmental surveillance. Therefore; determination of these elements in wastewater is very important. This paper reports the use of an adsorptive cathodic stripping voltammetric technique for the simultaneous determination of Ni(II); Co(II); and Zn(II) with dimethylglyoxime (DMG) as a chelating agent. Voltammograms of Ni(II); and Zn(II) initially contained three peaks corresponding to these metals. However; the peaks overlapped. Therefore; the effect of organic solvents was studied; and the results showed that the use of a suitable ratio of ethanol-water (1:5) solvent and pH provided peaks that were distinctly separated. The metals can be quantified at concentrations above 0.03 (Ni); 0.02; (Co); and 0.1 μg/mL (Zn). The RSD (%) at concentration levels of 0.10 μg/mL Ni(II); 0.10 μg/mL Co(II); and 0.30 μg/mL Zn(II) is 2.3; 2.0; and; 3.3%; respectively. The influence of pH; DMG concentration; scan rate; accumulations time; and potential was investigated. The method was satisfactorily used for determination of the metals under study in water and wastewater. © Pleiades Publishing; Inc; 2006;
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页码：262 / 265
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