Elimination voltammetry as a powerful electrochemical tool for improving voltammetric results
| Autoři | |
|---|---|
| Rok publikování | 2010 |
| Druh | Další prezentace na konferencích |
| Fakulta / Pracoviště MU | |
| Citace | |
| Popis | Cyclic Voltammetry (CV) and Linear Sweep Voltammetry (LSV) are useful electrochemical techniques that can be applied for analytical and electrokinetic measurements on both static drop and solid electrodes, since they are simple and low-cost measurements with fast scan rates and with the ability to show the reversibility of redox reactions. Elimination voltammetry with linear scan (EVLS) provides an improvement of the LSV or CV results through eliminating and conserving various particular currents of which the total recorded current is composed. The general idea of the method is based on the application of certain elimination functions formed by linear combination of total currents measured at different scan rates. Then, the elimination process supplies further information on electrochemical mechanisms. The theory of EVLS and its verification using scan rates based on multiples of two has been extensively discussed previously. This study deals with the extension of EVLS, as a novel and promising tool in LSV or CV for any ratios of scan rates (integer). The first idea is to calculate the elimination coefficients of EVLS functions for different scan rate combinations by Matlab program. The second idea is to show the verification of extended EVLS theory together with the relative error of elimination function (REEF). Using different scan rate combinations, the verification of six elimination functions conserving one current component and eliminating one or two simultaneous ones is discussed. Theoretical results are confirmed by CV measurements concerning the reduction and oxidation processes of Cd(II), Zn(II) and Cu(II) on a hanging mercury drop electrode (HMDE) and a paraffin impregnated graphite electrode (PIGE). It has been demonstrated that EVLS provides information about the type of the current involved in the considered process. |
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