Resumo

CANO, Manuel; PALENZUELA, Beatriz  e  RODRIGUEZ-AMARO, Rafael. Preparation and Characterization of a PVC/TTF-TCNQ Composite Electrode: Applications in a Flow Injection System . Port. Electrochim. Acta [online]. 2007, vol.25, n.1, pp.67-78. ISSN 0872-1904.

It was prepared a new polyvinyl chloride (PVC)/tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) composite electrode which showed good physical and electrochemical characteristics. Different PVC/TTF-TCNQ-graphite proportions were tested and the relation 1/10 (p/p) PVC/TTF-TCNQ provided the best results in terms of sensitivity, coefficients of variation and mechanical resistance. This electrode has interesting applications as a working electrode. So, employment is remarkable in a flow injection system and had been satisfactory checked to detect ascorbic acid. Also, the electrode exhibits selective voltammetric behaviour in aqueous solution that affords its use as an ion detector. The proposed electrode showed good kinetics property with a low background current and a relatively reproducible signal. Moreover, the electrode can be prepared in a simple way and its surface easily recovered.

Palavras-chave : TTF-TCNQ; composite electrode; PVC; ascorbic acid; flow injection.

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