Adsorptive Voltammetric Determination of o-aminophenol Using Nafion-modified Glassy Carbon Electrode

In this paper, a Nafion-modified glassy carbon electrode(GCE) for the determination of o-aminophenol(OAP) is described. In pH 2.0 0.1 mol/L H 3PO 4 buffer, OAP has very sensitive oxidation peak at the Nafion-modified GCE at 0.44 V(vs. SCE). Compared with the bare GCE, the Nafion-modified GCE can significantly improve the oxidation peak current. The parameters for the determination of o-aminophenol, such as supporting electrolyte, pH values, accumulation potential, open-circuit preconcentration time, and scan rate, are optimized. In pH 2.0 0.1 mol/L H 3PO 4 buffer, OAP can attract protons and have excess positive charges. Nafion contains -SO 3 - group and can attract cations. Via ion-exchange interaction, OAP can adsorb on the Nafion-modified glassy carbon electrode. Therefore, Nafion can enhance the sensitivity of determination of OAP. Using the Nafion-modified GCE, OAP in water samples has been determined. The average recovery is 101.74%.