Highly selective-cathodic stripping voltammetric determination of copper with alpha-benzylmonooxime

Copper(II) was selectively accumulated on hanging mercury drop electrode in corporating alpha-benzylmonooxime. The current measurements were carried ou t by differential pulse cathodic voltammetry, due to the reduction of coppe r(II)-alpha-benzylmonooxime complex adsorbed on to the hanging mercury drop electrode (HMDE). The possible interference by other trace metals, major c ation and organic complexing ligands are investigated. The influence of var iables is completing studied. The peak current is proportional to the conce ntration of copper(II) over the range 1-850 ng/ml with a limit of detection of 0.3 ng/ml with an accumulation time of 90 s. The relative standard devi ation for 10 replicate determination of 200.0 ng/ml Cu(II) is equal to 1.2% . The method was applied to the determination of copper in some commercial salts and river water. (C) 2000 Elsevier Science B.V. All rights reserved.