Eletrodo de pasta de carbono em minicavidade de contato sólido

Abstract

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 SiO 2(Eu 3+ 2%) and SiO 2(Eu 3+ 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. EPCminicavity is suitable for electroanalysis using modified carbon paste.