Development and Application of Novel Thin-Film Spectroelectrochemical Sensors Possessing Three Modes of Selectivity* |
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| Authors: | Heineman W R Seliskar C J Richardson J N |
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| Institution: | (1) Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, USA;(2) Department of Chemistry, Shippensburg University, 1871 Old Main Drive, Shippensburg, PA 17257, USA |
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| Abstract: | A thin-film spectroelectrochemical sensor design employing three modes of selectivity is described. Selectivity is achieved through (1) partitioning of the analyte into a chemically selective film, (2) electrochemical cycling of the analyte over a given potential window, and (3) absorbance of one of the redox states of the analyte at the chosen analytical wavelength. Optimization of the sensor is described with respect to both improved selectivity and sensitivity, as well as its response to a number of different chemical species. Lastly, application of the sensor for determination of ferrocyanide, Fe(CN)4-
6, in both radioactive waste simulant and actual waste storage tank contents is given. |
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| Keywords: | thin-film spectroelectrochemical sensors selectivity chemically selective films |
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