title: Differential pulse adsorption stripping voltammetric determination of copper(II) with 2-mercaptobenzimidazol at a hanging mercury-drop electrode.
abstract: Copper(II) was selectively accumulated on a hanging mercury-drop electrode by using 2-mercaptobenzimidazole. Ensuing measurements were carried out by differential pulse adsorption stripping voltammetry. Factors affecting the accumulation, reduction, and stripping steps were investigated and a procedure was developed. The optimum conditions for the analysis of copper were pH 5.0, 5.33 x 10(-5) M 2-mercaptobenzimidazole and an accumulation potential of -0.10 V (vs. Av/AgCl). A linear range was obtained in the concentration range 0.2-100 ng/ml with a 90 s accumulation time and a scan rate of 16 mV/s. For ten successive determinations of 1.0, 20.0 and 70.0 ng/ml copper(II), relative standard deviations of 4.2, 3.5 and 2.8%, respectively, were obtained. The developed method was applied to the determination of copper in commercial salts and aluminium alloys.
authors.affiliation: College of Chemistry, Isfahan University of Technology, Isfahan, 84154, Iran. Ensafi@cc.iut.ac.ir
authors.forename: A A
authors.initials: AA
authors.lastname: Ensafi
authors.forename: S
authors.initials: S
authors.lastname: Abbasi
authors.forename: H
authors.initials: H
authors.lastname: Rahimi Mansour
authors.forename: I M
authors.initials: IM
authors.lastname: Baltork