石墨烯修饰玻碳电极测定邻苯二酚

摘要

A graphene modified glassy carbon electrode was fabricated for the determination of catechol. The electrochemical behaviors of the modified electrodes were investigated by cyclic voltammetry ( CV). The influence of the solution pH on the modified electrode was studied by differential pulse voltammetry ( DPV) . It was found that there was a good linear relationship between the response current and the concentration of catechol over the range from 5. 0 × 10-8 to 5.6 × 10-4 mol/L, with the correlation coefficient of 0. 9919 and the detection limit of 6. 68 × 10 -9 mol/L(S/N = 3). Compared with other modified electrode, the graphene modified glassy carbon electrode was convenient to prepare, and it exhibited a fast response time and long-term stability, and could be used in the determination of catechol.%制备了用于测定邻苯二酚(CAT)的石墨烯修饰电极,并应用循环伏安法研究了CAT在该修饰电极上的电化学行为;用差分脉冲伏安法研究了测试底液的pH值对该修饰电极性能的影响,结果表明,此修饰电极在含不同浓度CAT的PBS溶液(pH=7.0)中测定,响应电流与CAT浓度在5.0×10-8～5.6×10-4 mol/L范围内有良好的线性关系,相关系数r =0.9919,检出限为6.68 ×10-9 mol/L( S/N=3).与其它几种修饰电极相比,石墨烯修饰电极制备简单、响应时间快、操作简便,稳定性和重现性良好,有应用价值.