Electrochemical Investigation of 4-Aminophenol at CTAB Modified Carbon Paste Electrode: A Cyclic Voltammetric Technique

4-aminophenol is the main impurity present in preparations of paracetamol. Using the cyclic voltammetry, the electrode behaviour of 4-aminophenol has been studied in 0.1 M phosphate buffer solutions at carbon paste electrode and surfactant modified carbon paste electrode. The optimal potential window of wide range from -0.4 V to 0.7 V was selected. The electron transfer kinetics of the CTAB/CPE in the detection of analyte was determined by the scan rate effect and concentration variation studies. The scan rate effect showed the electrode process is adsorption controlled. The oxidation peak currents represented a linear dependence on 4-aminophenol concentration from 1 mM to 4 mM with correlation coefficient r2=0.9942. The effect of cationic surfactant shows good high sensitivity and stability for the redox process of the 4-amino phenol. The detection limit was found to be 1×10-7 M.