The behaviour of an electrochemical detector used in liquid chromatography and continuous flow voltammetry: Part III. Potential dependent current |
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| Authors: | Stephen G Weber William C Purdy |
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| Institution: | Department of Chemistry, McGill University, 801 Sherbrooke St., W., Montreal, Quebec H3A2K6 (Canada) |
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| Abstract: | The potential dependence of the steady-state current at a channel electrode has been calculated approximately. Six regions of behavior can be described from a consideration of the characteristic times of diffusion, fluid flow and electrochemical reaction. Wave shapes and half-wave potential shifts are as expected for amperometric cells under all values of the heterogeneous reaction rate constant, and for reversible electrochemical reactions in a coulometric cell. The wave adopts a peculiar shape for irreversible reactions at a coulometric electrode. This is caused by the inapplicability of the concept of mass transfer control in these systems. |
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| Keywords: | To whom correspondence should be addressed: Department of Chemistry University of Pittsburg Pittsburg PA 15260 U S A |
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