A Novel and Highly Sensitive Reduced Graphene Oxide Modified Electrochemical Sensor for the Determination of Chlorpyrifos in Real Sample

Abstract

In this study, the voltammetric behavior of chlorpyrifos(CPF) was investigated using reduced graphene oxidemodified glassy carbon electrode(RGO/GCE). FT-IR, XRD and TEM methods were employed in the characterization of graphene oxide and reduced graphene oxide prepared by Hummers' method. Electrochemical characterization of CPF was determined by cyclic voltammetry(CV) and differential pulse voltammetry(DPV). Determination of CPF was performed by differential pulse adsorptive stripping voltammetry (DPAdSV) on RGO/GCE. Two working ranges between 5.19x10 -7 -8.12x10 -6 M and 8.12x10 -6 -2.18x10 -3 M were obtained in the CPF calibration curve created by DPAdSV method on RGO/GCE and the limit of detection was found to be 1.56x10 -7 M. Recovery of CPF from tap water samples on RGO/GCE was 101.0%. In conclusion, a selective and sensitive sensor was developed for the determination of CPF, which can be used in real samples.

A Highly Sensitive Electrochemical Sensor Based on Electrocatalytic Reduction Effect of Cu2+ on Trace Determination of Malathion in Soil and Other Complex Matrices

“…Recently, a series of electrochemical techniques have been reported for trace determination of reducible pesticides on various modified electrodes, including mercury [3,20,[30][31][32][33]. Pulse polarography [32,33] and cathodic/anodic stripping voltammetric techniques at HMDE and other modified electrodes [34][35][36][37][38][39][40][41][42] for trace determination of malathion and other analogs have been reported. However, most of the published sensors-based modified electrodes still have many drawbacks, such as complications in the synthesis, fabrication, characterization, and interference by other thiols [18][19][20].…”