title: Selective determination of trace copper(II) by cathodic adsorptive stripping voltammetry with a naphthol-derivative Schiff's base.
abstract: A selective and sensitive stripping voltammetric method for the determination of trace amounts of copper(II) with a recently synthesized naphthol-derivative Schiff's base (2,2'-[1,2-ethanediylbis(nitriloethylidyne)]bis(1-naphthalene)) is presented. The method is based on adsorptive accumulation of the resulting copper-Schiff's base complex on a hanging mercury drop electrode, followed by the stripping voltammetric measurement at the reduction current of adsorbed complex at -0.15 V (vs. Ag/AgCl). The optimal conditions for the stripping analysis of copper include pH 5.5 to 6.5, 8 microM Schiff's base and an accumulation potential of -0.05 V (vs. Ag/AgCI). The peak current is linearly proportional to the copper concentration over a range 2.3-50.8 ng ml(-1) with a limit of detection of 1.9 ng ml(-1). The accumulation time and RSD are 90 s and (3.2-3.5)%, respectively. The method was applied to the determination of copper in some analytical grade salts, tap water, human serum and sheep's liver.
authors.affiliation: Department of Chemistry, Razi University, Kermanshah, Iran. mshamsipur@yahoo.com
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Shamsipur
authors.forename: Mahboubeh
authors.initials: M
authors.lastname: Saeidi
authors.forename: Hashem
authors.initials: H
authors.lastname: Sharghi
authors.forename: Hossein
authors.initials: H
authors.lastname: Naeimi
mesh_terms: D003300:Copper / Q000737:chemistry*; D004566:Electrodes; D006801:Humans; D007477:Ions; D011199:Potentiometry / Q000379:methods; D012545:Schiff Bases / Q000737:chemistry*
chemical_list: D007477:Ions; D012545:Schiff Bases; D003300:Copper