Selenium-coated carbon electrode for anodic stripping voltammetric determination of copper(II)

Abstract

In this work, we describe a new and promising type of selenium film electrode for anodic stripping voltammetry. This method is based on formation of copper selenide onto an in-situ formed selenium-film carbon electrode, this followed by Osteryoung square-wave anodic stripping voltammetry. Copper(II) is also in-situ electroplated in a test solution containing 0.01 mol L-1 hydrochloric acid, 0.05 mol L-1 potassium chloride and 500 μg L-1 Se(IV) at a deposition potential of −300 mV. Well-defined anodic peak current observed at about 200 mV is directly proportional to the Cu(II) concentration over the range of 1.0─100 μg L-1 under the optimized conditions. The detection limit (3 sigma level) is 0.2 μg L-1 Cu(II) at 180 s deposition time. Relatively less interferences are shown from most of metal ions except for antimony(III). The proposed method can be applied to sample analyses of river water and oyster tissue with good accuracy