Eletrodo de pasta de carbono em minicavidade de contato sólido

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.