焦性没食子酸在多壁碳纳米管修饰电极上的电化学行为及分析应用  

Study on the Electrochemical Behavior and Determination of Pyrogallol at the MWNT-modified Electrode

作　　者：吕少仿[1] 

机构地区：[1]孝感学院化学系,湖北孝感432000

出　　处：《孝感学院学报》2004年第3期40-43,共4页JOURNAL OF XIAOGAN UNIVERSITY

摘　　要：报道了一种直接测定焦性没食子酸的高灵敏度电化学分析方法。在多壁碳纳米管(MWNT)修饰玻碳电极上,焦性没食子酸分别在0.068V和0.018V出现一对灵敏的氧化还原峰。与裸玻碳电极相比,焦性没食子酸在MWNT修饰电极上的氧化峰电流显著增加。研究了焦性没食子酸在MWNT修饰电极上的伏安行为,优化了测定参数,在此基础上建立了一种直接测定焦性没食子酸的电化学分析方法。氧化峰电流与焦性没食子酸浓度在2.0×10-7～5.0×10-5mol/L之间有很好的线性关系。开路富集2min后的检出限为5.0×10-8mol/L。用此方法测定了焦性没食子酸的含量,结果满意。In this paper,a high sensitivity electrochemical method to determine pyrogallol directly was reported. A couple of sensitive redox peaks for pyrogallol at the multi-wall nanotubes(MWNT) modified glassy carbon electrode (GCE) were observed at the potential of 0.068 V and 0.018 V,respectively. The oxidation peak current for pyrogallol at the MWNT-modified GCE increased significantly compared with that at the bare GCE. The voltammetric behavior of pyrogallol at the MWNT modified GCE was investigated and the experiment parameters such as buffer pH,accumulation time,the amount of MWNT-DHP suspension and scan rate were optimized. The oxidation peak current is proportional to the concentration of pyrogallol over the range from 2.0×10^(-7) to 5.0×10^(-5) mol/L. The detection limit is 5.0×10^(-8) mol/L under the open circuit accumulation for 2 min. The developed method has been applied to determine pyrogallol in real samples with satisfactory results.

关 键 词：焦性没食子酸 碳纳米管 修饰电极 测定 

分 类 号：R917[医药卫生—药物分析学]