Simultaneous electrochemical determination of nanomolar concentrations of aminophenol isomers using nanocrystalline zirconosilicate modified carbon paste electrode

Metallosilicates (Metal = Zr, Ti, and Al) modified carbon paste electrodes were fabricated for the simultaneous electrochemical determination of aminophenol isomers. Among the various nanocrystalline metallosilicates investigated in this study, nanocrystalline zirconosilicate modified carbon paste electrode exhibited the highest electro-catalytic activity with excellent stability, sensitivity, and selectivity. The electrochemical behavior of the aminophenol isomers at nanocrystalline zirconosilicate modified carbon paste electrode was investigated in detail. Under the optimum conditions, a wide linear range was obtained from 60 nM to 500 mu,M for p-aminophenol, 120 nM to 500 mu,M for o-aminophenol and m-aminophenol. The detection limit was found to be 26 nM, 30 nM, and 30 nM for p-aminophenol, o-aminophenol, and m-aminophenol, respectively. The analytical performance of the sensor was demonstrated in the determination of aminophenol pollutants present in the different environmental water samples. (C) 2014 Elsevier Ltd. All rights reserved.