title: Simultaneous determination of ultra trace amounts of lead and cadmium in food samples by adsorptive stripping voltammetry.
abstract: 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 1.0×10(-4)M, the accumulation potential of -0.4V (vs. Ag/AgCl), the accumulation time of 160s, and the scan rate of 100mV/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 0.2-30ng/ml, respectively, with detection limit of 0.017ng/ml for Pb (II) and 0.01ng/ml for Cd (II). The procedure was successfully applied to the simultaneous determination of both ions in food samples (rice, soya and sugar).
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ilam University, Ilam, Iran. Electronic address: s.abbasi@mail.ilam.ac.ir.
authors.forename: Shahryar
authors.initials: S
authors.lastname: Abbasi
authors.affiliation: Department of Chemistry, Faculty of Sciences, Ilam University, Ilam, Iran.
authors.forename: Kobra
authors.initials: K
authors.lastname: Khodarahmiyan
authors.affiliation: Department of Chemistry, Islamic Azad University of Ilam, Ilam, Iran.
authors.forename: Freshteh
authors.initials: F
authors.lastname: Abbasi
keywords: 2-Mercaptobenzothiazole; Adsorptive stripping voltammetry; Cadmium; Food samples; Lead