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Elimination Voltammetry in Future

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Rok publikování 2014
Druh Konferenční abstrakty
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Popis Electrochemical techniques have undergone many important developments conditioned by a better understanding of electrode processes and improvements in instrumentation, which have allowed faster measurements to be made under better-controlled conditions. In spite of their fast and perspective development some drawbacks persist. the contribution presents an interesting solution for addressing the major shortcomings of linear sweep and sometimes also of square wave voltammetry (low sensitivity, high proportion of capacitive current component, and skewing of overlapping signals) in the form of our elimination voltammetry. Although this method was originally called elimination voltammetry with linear scan (EVLS), I suggest the term elimination procedure (EP) because the elimination principle can be used not only in linear sweep voltammetry but also in square wave voltammetry. Based on the different dependence of the particular currents of which the total voltammetric current is composed (i.e. diffusion, charging, kinetics, etc.) on scan rate, the EP is capable of eliminating or conserving some chosen current components. The voltammetric results are improved in both aspects, the sensitivity increase and the selectivity improvement. Successful applications of EP are presented on the electroanalysis of oligonucleotides and their components at unmodified carbon electrodes by metalic nanoparticles. EP is highly sensitive technique for the analysis of electroactive substances which are adsorbed on the electrode surface and for the analysis of electrode surfaces. the advantages of EP consist in the ability: (a) to detect the processes hidden in the predominant current, such as the discharge of supporting electrolyte, (b) to increase the current sensitivity by at least one order of magnitude, (c) to determine the charge transfer coefficient, and (d) to detect the chemical reaction preceding the elctron transfer. Thus, the EP offers a new tool contributing to a better understanding of basic electrochemical processes on the elctrode surface, and one which is capable of markedly improving the sensitivity of voltammetric assays.
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