N-doped reduced graphene oxide supported Pd-doped lanthanum vanadate constructs an electrochemical sensing platform for simultaneous detection of carbendazim and methyl parathion in food

Abstract

The abuse of pesticides is apt to cause residue issues. In this study, an electrochemical sensing platform was developed using N-doped reduced graphene oxide (N-rGO) loaded with the Pd-doped lanthanum vanadate (Pd-LaV) to simultaneously detect two pesticides: carbendazim (CBZ) and parathion methyl (MP). The results demonstrated that N-doping can not only enhance the electron transport and catalytic ability of rGO, but also avoid the aggregation of Pd-LaV. Moreover, Pd compensated for the insufficient conductivity of LaV, fulfilling the catalytic performance of LaV better played out. N-rGO/Pd-LaV possessed abundant active groups, reaction sites, and effective interaction, which served its charge transfer rate and electrocatalytic ability as superior. In individual detection, LODs of CBZ and MP were 2.42 nmol/L and 1.85 nmol/L, respectively. In simultaneous detection, LODs of CBZ and MP were 1.94 nmol/L and 1.71 nmol/L, respectively. Finally, the sensing platform was applied to water and vegetable juice samples.