Print version ISSN 0100-4670
FERREIRA, Antonio Ap. Pupim et al. Carbon paste electrode in a solid-contact minicavity. Eclet. Quím. [online]. 2011, vol.36, n.2, pp.183-204. ISSN 0100-4670. http://dx.doi.org/10.1590/S0100-46702011000200010.
This work describes the preparation of carbon paste electrode (EPC) in a solid-contact minicavity and its evaluation when containing carbon paste without and with SiO2(Eu3+ 2%) and SiO2(Eu3+ 2%)-lysine sub-micrometrics particles. For this study cyclic voltammetry and electrochemical impedance measurements were performed at pH 7.4 in 0.1 mol L-1 PBS containing Fe(CN)6-3/-4 redox species. The impedance results were interpretated based on a charge-transfer reaction involving Fe(CN)6-3/-4 species and/or oxygen at higher frequencies and, diffusion of the electroactive species and carbon paste characteristics at lower frequencies. EPC-minicavity is suitable for electroanalysis using modified carbon paste.
Keywords : carbon paste electrode; minicavity electrode; electrochemical methods.