Aplicação da técnica eletroanalítica de pulso diferencial usando o eletrodo de carbono vítreo modificado com cisteína para monitorar a degradação eletroquímica de ácido oxálico
In this paper, the technique of differential pulse voltammetry (DPV) has been studied for monitoring the concentration of oxalic acid (OA) during their electrochemical oxidation (EO) in acidic medium using platinum anode supported on titanium (Ti / Pt). The DPV was standardized and optimized using a...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/17732 |
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| Resumo: | In this paper, the technique of differential pulse voltammetry (DPV) has been
studied for monitoring the concentration of oxalic acid (OA) during their
electrochemical oxidation (EO) in acidic medium using platinum anode supported on
titanium (Ti / Pt). The DPV was standardized and optimized using a glassy carbon
electrode modified with cysteine. The modification with cysteine was developed
electrochemically, forming a polymeric film on the surface of the glassy carbon
electrode. The formation of the polymer film was confirmed by analysis of scanning
electron microscope and atomic force microscope, confirming the modification of the
electrode. The electrochemical degradation was developed using different current
densities 10, 20 30 and 40 mA cm -2 electrode with Ti / Pt observing the degradation
of oxalic acid, and monitored using the method of KMnO4 titration. However, the
analyzes with DPV showed the same behavior elimination of oxalic acid titration.
Compared with the titration method classical observed and DPV could be a good fit,
confidence limits of detection and confirming the applicability of the technique
electroanalytical for monitoring the degradation of oxalic acid |
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