Abstract: The graphene-chitosan modified glassy carbon(CRG-CS/GC) electrode was prepared. Based on this, the electrochemical behavior of pentachlorophenol(PCP) was investigated by cyclic voltammetry and differential pulse voltammetry. It was found that the oxidation current at CRG-CS/GC electrode is obviously larger than at GC electrode, indicating that the CRG-CS/GC electrode has strong adsorption ability and can promote the electron transport. Then, the CRG-CS/GC electrode with the simple, sensitive, stable and reliable property was developed for the detection of PCP. Using this electrode, analytical performance with the linear range from 1.0×10-7 to 1.0×10-5 mol/L and a limit of detection to 2.3×10-8 mol/L were obtained. The electrochemical sensor with the CRG-CS/GC electrode was successfully employed to detect PCP in several water samples. The recovery can reach 97%~103%.

Key words: Graphene, modified electrode, electrochemical detection, pentachlorophenol