Electrochemical analysis of carbaryl in fruit samples on graphene oxide-ionic liquid composite modified electrode

Graphene oxide-ionic liquid composite modified glassy carbon electrode was fabricated for the electrochemical oxidation and determination of carbaryl. The modified electrode exhibits an obvious electrocatalytic activity towards the oxidation of carbaryl. The electrochemical oxidation of carbaryl at modified electrode is a one-electron coupling with one-proton transfer process. The diffusion coefficient and standard heterogeneous rate constant are calculated to be 3.08 x 10(-5) cm(2) s(-1) and 5.71 x 10(-3) cm s(-1), respectively. For the determination of carbaryl, a linear scope of 0.10-12.0 mu M with a detection limit of 0.02 mu M was achieved. The proposed method was applied successfully for the determination of carbaryl in fruit samples, which provided a promising tool for food safety control. (C) 2015 Elsevier Inc. All rights reserved.