期刊
FOOD CHEMISTRY
卷 128, 期 1, 页码 254-257出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2011.02.067
关键词
Lead; Cadmium; 2-Mercaptobenzothiazole; Adsorptive stripping voltammetry; Food samples
资金
- Ilam University Research Council
A selective and sensitive method for simultaneous determination of lead and cadmium by adsorptive differential pulse cathodic stripping voltammetry is presented. The method is based on adsorptive accumulation of the complexes of Pb (II) and Cd (II) ions with 2-mercaptobenzothiazole onto hanging mercury drop electrode (HMDE), followed by the reduction of the adsorbed species by differential pulse cathodic stripping voltammetry. Optimal conditions were obtained at pH 8.0, 2-mercaptobenzothiazole concentration of 1.0 x 10(-4) M, the accumulation potential of -0.4 V (vs. Ag/AgCl), the accumulation time of 160 s, and the scan rate of 100 mV/s. Under optimised conditions, linear calibration curves were established for the concentration of Pb (II) and Cd (II) in the range of 0.5-70 and 0.2-30 ng/ml, respectively, with detection limit of 0.017 ng/ml for Pb (II) and 0.01 ng/ml for Cd (II). The procedure was successfully applied to the simultaneous determination of both ions in food samples (rice, soya and sugar). Published by Elsevier Ltd.
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