A voltammetric sensor based on GO-MWNTs hybrid nanomaterial-modified electrode for determination of carbendazim in soil and water samples

A voltammetric sensor for the determination of carbendazim was developed at a glassy carbon electrode modified with a hybrid nanomaterial (graphene oxide-multi-walled nanotubes/glassy carbon (GO-MWNTs/GC)). Its surface electrochemical property was studied with UV-Vis spectroscopy, TEM analysis, and electrochemical impedance spectroscopy. The electrochemical behavior of carbendazim was investigated on the modified electrode with cyclic voltammetry and differential pulse voltammetry. The influence of modifier dosage, buffer solution, pH, accumulation time, and scan rates on the determination was discussed. The results indicated that the reaction of carbendazim on the electrode was controlled by diffusion and was an irreversible process with two electrons. The effective area of GO-MWNTs/GC, anodic transfer coefficient, and apparent diffusion coefficient were calculated. The anodic peak current of carbendazim was linear with the concentration of carbendazim from 10 nM to 4 mu M with a detection limit of 5 nM (S/N = 3). The proposed sensor was successfully applied to the determination of carbendazim in soil and tap water.