石墨烯修饰碳棒电极测定3-硝基-4-氨基苯酚

Determination of 4-amino-3-nitrophenol with graphene modified carbon rod electrode

利用滴涂法制备了石墨烯修饰碳棒电极,采用循环伏安法和交流阻抗测量研究了3-硝基-4-氨基苯酚在该修饰电极的电化学行为。在优化条件下,利用差分脉冲伏安法对3-硝基-4-氨基苯酚进行定量分析,在5×10^-8~1×10^-5 mol/L范围内,3-硝基-4-氨基苯酚响应电流与浓度呈良好的线性关系,相关系数R^2=0.9961,检出限为1×10^-8 mol/L(S/N=3)。与液相和气相色谱方法比较,石墨烯修饰碳棒电极成本低、操作简单、灵敏度高、稳定性好。

A graphene modified carbon rod electrode for the determination of 3-nitro-4-aminophenol was prepared by drop coating method. The electrochemicalbehaviors of 3-nitro-4-aminophenol on the modified electrode was investigated by cyclic voltammetry and A.C.impedance. Under the optimized conditions,dif-ferential pulse voltammetry was utilized for the quantitative analysis of 3-nitro-4-aminophenol. It was found that there was a good linear relationship between the response current and the concentration of 3-nitro-4-aminophenol over the range from 5×10^-8 to 1×10^-5 mol/L,with the correlation coefficient of 0.9961 and the detection limit of 1×10^-8 mol/L(S/N=3). Compared with liquid phase and gas chromatography methods,the graphene modified carbon rod electrode was convenient to prepare with low cost,and it exhibited high sensitivety and long-time stability,and could be used in the determination of 3-nitro-4-amino-phenol.