Elimination procedure in square-wave voltammetry
| Authors | |
|---|---|
| Year of publication | 2014 |
| Type | Article in Proceedings |
| Conference | 15th International Conference on Electroanalysis |
| MU Faculty or unit | |
| Citation | |
| Field | Physical chemistry and theoretical chemistry |
| Keywords | square-wave voltammetry; elimination procedure; oligonucleotides; square-wave frequency |
| Description | Square-wave voltammetry (SWV) is one of the four major voltammetric techniques provided by modern computer - controlled electroanalytical instruments. Applications of square-wave voltammetry include the study of electrode kinetics with regard to the preceding, following or catalytic homogenous chemical reactions and determination of some species at trace levels. In this communication we present the application of the elimination procedure to SWV results. Using the different dependence of a linear sweep voltammetric current component (diffusion, charging, kinetic..) on scan rate, EP is capable of conserving or eliminating some current components. The variable parameter for a desired elimination in SWV is square-wave frequency, and even though it is a pulse method which suppresses the influence of the charging current, the elimination procedure increases the sensitivity of SWV by one order. For a totally adsorbed electroactive particle, EP(eliminating simultaneously the kinetic and charging currents) also provides a specific signal in the form of peak-counterpeak and from the electroanalytical point of view this type of signal does not require a baseline correction. Our application approach was verified by means of reduction and oxidation signals of short synthetic oligonucleotides including the presence or absence of a homogeneous chemical reaction preceding the electron transfer. It is shown that SWV in connection with EP is a new powerful electrochemical technique that can be applied in both electrokinetic and quantitative determination of redox couples strongly immobilized on the electrode surface. Generally, treatment of voltammetric data by the elimination procedure gives a new dimension to voltammetric methods. |
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