Voltammetric determination of gold with a Rhodamine B-modified carbon paste electrode |
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| Authors: | G. Kö lbl, K. Kalcher A. Voulgaropoulos |
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| Affiliation: | (1) Institut für Analytische Chemie, Karl-Franzens Universität, Universitätsplatz 1, A-8010 Graz, Austria;(2) Laboratory of Analytical Chemistry, Department of Chemistry, University of Thessaloniki, GR-64006 Thessaloniki, Greece |
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| Abstract: | Summary The voltammetric behaviour of gold on carbon paste electrodes chemically modified with Rhodamine B by means of electrostatical binding was studied. The dye was attached to the electrode material with hexane sulphonic acid. Gold was determined by differential pulse voltammetry after preconcentration under open circuit conditions and medium exchange. Thus, 5  g Au/l could be analyzed. Linearities between signal response and concentration were found for concentrations up to 10 mg/l when measuring in the differential pulse mode. Parameters like composition of the paste and of the analyte solution as well as interferences with other ions were investigated. |
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