PRECONCENTRATION AND ELECTROANALYSIS OF COPPER SPECIES AT ELECTROCHEMICALLY ACTIVATED GLASSY-CARBON ELECTRODES ADSORBED WITH ALIZARIN-RED-S

Electrochemically activated glassy carbon electrodes adsorbed with ali zarin red S (ARS) were applied to the electroanalysis of metal species . Copper species were readily extracted onto the ARS modified electroy le and were determined electrochemically. Experimental results showed that the voltammetric peak current resulted from copper incorporation on ARS modified electrodes was significantly larger than that obtained on bare activated electrodes. Voltammetric peak currents showed linea r response for copper concentrations in the range between 0.001 and 0. 15 mM with a slope of 1.77 A M-1 (correlation coefficient: 0.998). The reproducibility of the voltammetric measurements was found to be with in 10 % RSD for five replicate measurements on copper concentration of 0.10 mM. The modified electrodes could be applied for repeated copper determinations without appreciable deterioration in electrode respons e.