Cyclic Voltammetric Investigation of Dopamine at p-aminobenzoic Acid Modified Carbon Paste Electrode

In this investigation the modified carbon paste electrode was fabricated by adding p-amino benzoic acid into the mixture of dry graphite powder with silicon oil in the proportion of 60:40. The Cyclic voltammogram of p- aminobenzoic acid modified carbon paste electrode (PABA/CPE) was investigated with standard potassium ferrocyanide showed a reversible voltammogram. Electrocatalytic oxidation of dopamine is studied in acetate buffer solution at neutral pH-7.0 and the effect of concentration, scan rate, pH and effect of surfactant studies were made. The electrode process was found to be diffusion controlled. The PABA/CPE showed significant enhancement of oxidation peak for dopamine at 6.0 mg into the paste. Hence modifier is selected at 6 mg PABA into the CPE