Abstract
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 0.3–18μmolL−1 for o-aminophenol, 0.3–16μmolL−1 for m-aminophenol and 0.1–12μmolL−1 for p-aminophenol, respectively, with detection limit of 0.05μmolL−1 for o- and m-aminophenol, 0.02μmolL−1 for p-aminophenol. The proposed method was applied to quantitatively determine aminophenol isomers in river sample with satisfactory recoveries.
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