Electrochemical oxidation of 8-hydroxyquinoline and selective determination of tin(II) at solid electrodes |
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| Authors: | Z. P. Yang M. Alafandy K. Boutakhrit J.-M. Kauffmann J. Arcos |
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| Affiliation: | 1. University Libre de Bruxelles, Institut de Pharmacie, Campus Plaine CP 205/6, B1050 Bruxelles, Belgium;2. Department of Analytical Chemistry, University of Burgos, E47005 Burgos, Spain |
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| Abstract: | The electrochemical oxidation of 8-hydroxyquinoline and several structurally related molecules has been investigated by cyclic voltammetry at solid electrodes (GCE, CPE, Pt) as a function of pH in aqueous acetate media. Oxine showed one irreversible oxidation peak whose magnitude decreased in the presence of cations readily complexed by oxine and with concomitent formation of a new oxidation peak at more positive potentials. Tin(II ) was found to exhibit a distinct behavior as its oxidation was catalyzed by the presence of oxine in the analyzed solution. The tin(II )-oxine oxidation peak was found to be linearly related to inorganic tin(II ) concentration allowing its quantitative determination at micromolar levels. |
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