Preparation of nio-graphene oxide nanosensor for adsorptive stripping voltammetric determination of dinoterbon in food samples

Abstract

Graphene oxide (GO) modified NiO electrochemical nanosensor was developed for the determination of the dinoterbon in food samples using adsorptive stripping voltammetry. The modified nanosensor characterized by TEM, XRD, cyclic and adsorptive stripping voltammetry. Dinoterbon pesticide exhibited a single well-defined cathodic peak at pH 4.0 at Britton–Robinson buffer (-810.0 mV). The voltammetric characterization of the pesticide residues is evaluated and the parameter such as the effect of pH, scan rate, pulse amplitude, deposition potential and deposition time were optimized. The current–concen-tration plot obtained using this peak was straight-lined over the range from 0.05 to 50.00 µg mL-1 with limit of detection (LOD) 0.028 µg mL-1. The proposed method was efficiently applied to the determination of dinoterbon in food samples. The mean recoveries of the pesticide 97.40 to 99.88 % with a relative standard deviation of 0.114 % in food samples respectively.