The electrochemical behaviors of aminophenol (AP) isomers at amino-functionalized SBA15 modified carbon paste electrode (NH2-SBA15/CPE) was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in Britton-Robinson buffer solutions (pH 9.0). The results demonstrated that the NH2-SBA15/CPE exhibited a strong electrocatalytic performance toward aminophenol isomers, and the oxidation peak potential of each analyte in aminophenol isomers mixtures could be well separated. A selective method was developed for the determination of ortho-(o-), meta-(m-) and para-(p-) aminophenol simultaneously, without any chemical separations. Under the optimized conditions, the linear range was 0.3-18 mu mol L-1 for o-aminophenol, 0.3-16 mu mol L-1 for m-aminophenol and 0.1-12 mu mol L-1 for p-aminophenol, respectively, with detection limit of 0.05 mu mol L-1 for o- and m-aminophenol, 0.02 mu mol L-1 for p-aminophenol. The proposed method was applied to quantitatively determine aminophenol isomers in river sample with satisfactory recoveries. (C) 2012 Elsevier Ltd. All rights reserved.