%0 Journal Article
%T Eletrodo de pasta de carbono em minicavidade de contato s¨®lido
%A Ferreira
%A Antonio Ap. Pupim
%A Ribeiro
%A Sidney Jos¨¦ Lima
%A Fugivara
%A Cec¨ªlio Sadao
%A Caiut
%A Jos¨¦ Maur¨ªcio Almeida
%A Sargentelli
%A Vagner
%A Benedetti
%A Assis Vicente
%J Ecl¨¦tica Qu¨ªmica
%D 2011
%I Scientific Electronic Library Online
%R 10.1590/S0100-46702011000200010
%X 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.
%K carbon paste electrode
%K minicavity electrode
%K electrochemical methods.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0100-46702011000200010&lng=en&nrm=iso&tlng=en