聚苯胺-石墨烯修饰玻碳电极同时测定邻苯二酚和对苯二酚

Simultaneous Determination of Catechol and Hydroquinone Based on Polyaniline-Graphene Modified Glassy Carbon Electrode

本文制备了聚苯胺-石墨烯修饰玻碳电极,并用循环伏安（CV）法和微分脉冲伏安（DPV）法研究了邻苯二酚（CC）和对苯二酚（HQ）在该修饰电极上的电化学行为。实验结果表明,相对于裸玻碳电极,HQ和CC在聚苯胺-石墨烯修饰电极上的氧化峰电流显著提高,氧化峰电位相差104.8mV,实现了CC和HQ的选择性测定。DPV法同时测定二酚时,HQ和CC分别在1.0×10^-6~8.0×10^-4 mol/L浓度范围内与其峰电流呈良好的线性关系,相关系数R分别为0.998、0.997,检出限（S/N=3）分别为1.0×10^-7、8.0×10^-8mol/L。将该方法用于模拟水样分析,回收率为95.3%~103.5%。

In this paper,polyaniline-graphene modified glassy carbon electrode was prepared and the electrochemical behaviors of catechol（CC）and hydroquinone（HQ）were studied by cyclic voltammetry and differential pulse voltammetry.The experimental results showed that,compared with the bare glassy carbon electrode,the anodic peak current increased significantly at the polyaniline graphene（oxide）modified electrode,and the oxidation peak potential of HQ and CC can be separated by 104.8 mV.Differential pulse voltammetry was used for the simultaneous determination of CC and HQ in their ternary mixture.The concentration of HQ and CC showed good linear relationships with the oxidation peak current in the range of 1.0×10^-6-8.0×10^-4 mol/L,with correlation coefficients of R=0.998and0.997,respectively.The limits of detection for HQ and CC were 1.0×10^-7and 8.0×10^-8 mol/L（S/N=3）.The developed method was used to determine of water samples with recoveries of 95.3%-103.5%.