The electrochemical behaviour of solid species of different oxidation states of copper, lead, and bismuth and their ternary mixtures is studied by scan voltammetry using a carbon paste electrode with electrolytic binder and electroactive compound incorporated (CPE-EB-ECI). The electrolytic binder was a 10 N KOH solution, the scan potential range was between +0.50 and -1.50 V (see), and the scan rate was O.5 mVs(-1). The obtained electrochemical voltammograms were employed to elucidate the corresponding ion electrochemical transformations. In this way, the obtained conclusions were utilized to characterize the different peaks of the electrochemical profile of the high transition temperature superconductor Bi-0.7. Pb-0.3. Sr . Ca . Cu-1.3. O-x.