Studies on the voltammetric behaviour of a 2-mercaptoimidazole containing carbon paste electrode: determination of traces of silver |
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Authors: | Xiaohua Cai Kurt Kalcher Christian Neuhold Walter Goessler Irena Grabec and Boidar Ogorevc |
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Institution: | (1) College of Science and Technology, Hainan University, 570028 Haikou, China;(2) Institut für Analytische Chemie, Karl-Franzens Universität, Universitätsplatz 1, A-8010 Graz, Austria;(3) National Institute of Chemistry, Ljubljana, Slovenia |
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Abstract: | The voltammetric behaviour of a 2-mercaptoimidazole (2-MI) containing carbon paste electrode was studied. When mixed to carbon paste as an electrode modifier, 2-MI can be reduced at negative potentials (–1 V vs. SCE), but it does not give a response in the potential range where Ag(0) is oxidized to Ag(I). Silver could be accumulated from 0.1 mol l–1 acetate buffer onto a 2-MI modified carbon paste electrode without a potential applied; after medium exchange, it was reduced at –1 V vs. SCE in 0.1 mol l–1 acetate buffer solution and determined by differential pulse anodic stripping voltammetry. With suitable preconcentration times, the detection limit was 0.1 g l–1; a linear relation between current and concentration was found to exist within a range of 0.5 to 1000 g l–1. In the presence of EDTA, common metal ions have no or only little effect on the voltammetric determination of silver. |
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