Square Wave Voltammetric Detection of Dimethylvinphos and Naftalofos in Food and Environmental Samples Using RGO/CS modified Glassy Carbon Electrode

A novel modified reduced graphene oxide (RGO)/chitosan (CS) on a glassy carbon electrode for the determination of dimethylvinphos (2-chloro-1-(2,4-dichlorophenyl)vinyl dimethyl phosphate) and naftalofos (O,O-Diethyl-N-hydroxynaphthalimide phosphate) has been developed. The modified RGO/CS/GCE film was studied by cyclic voltammetry, square wave voltammetry and transmission electron microscopy. The effects of deposition potential, deposition time, scan rate, square wave frequency and pulse amplitude were examined to optimize the conditions of square wave voltammetry. The RGO/CS/GCE was well accomplished and determined in the range of 0.05-30.0 mu g L-1 for dimethylvinphos and naftalofos. The detection of limit (3Sb/S) was calculated and found to be 0.036 mg L-1 for dimethylvinphos and 0.044 mg L-1 for naftalofos with RGO/CS/GCE. The proposed sensor was successfully applied to food and environmental samples.