ELECTROANALYSIS OF COPPER SPECIES AT POLYPYRROLE-MODIFIED ELECTRODES BEARING ALIZARIN RED S-LIGANDS

Conducting polymer modified electrodes based on the incorporation of t he anionic complexing ligand alizarin red S into polypyrrole (Ppy) fil m during electropolymerization were applied to the electroanalysis of metal species including Cu+ and Cu2+. The copper species were readily extracted into the Ppy film electrode containing the complexing ligand s and were determined electrochemically. The sensitivity for determina tion of Cu2+ species was significantly better than that for Cu+ specie s at much lower concentrations despite a smaller complex stability, bu t suffered from a very limited linear region. The results also showed that the ligand-to-metal ratios for complex formation at the Ppy film were concentration dependent.