石墨烯-壳聚糖修饰玻碳电极应用于环境水中五氯酚的测定

制备了石墨烯(CRG)-壳聚糖(CS)修饰玻碳(CRG-CS/GC)电极，用循环伏安法和示差脉冲伏安法研究了五氯酚(PCP)的电化学行为，发现其氧化电流信号与GC电极相比明显增强，表明修饰电极对PCP具有较强的吸附作用，并能够加速电子传递。 建立了一种灵敏简便、重现性好、稳定性好的测定PCP的新修饰电极方法，线性响应范围为1.00×10-7~1.00×10-5 mol/L（R=0.9975），检测限为2.3×10-8 mol/L(S/N=3)。 将该修饰电极应用于实际水样分析，回收率为97%~103%。

Application of Graphene-chitosan Modified Electrode for the Detection of Pentachlorophenol in Environmental Water

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%.