修饰碳纤维电极为工作电极-溶出伏安法测定银离子
Stripping Voltammetric Determination of Silver Ion with Modifed Carbon Fiber Electrode as Working Electrode
摘 要
文中详述了碳纤维电极(CFE)的制备及处理方法,用电化学聚合法将噻吩单体聚合并修饰在CFE上.应用此修饰电极于测定银时,将试液在0.1 mol·L-1 HNO3中在-0.5 V处预还原120 s,使Ag+离子与聚噻吩生成络合物,然后在0~0.6 V范围内扫描,使Ag+从上述络合物中从电极上溶出,实现了银离子的阴极溶出伏安测定,在0.24 V处可得银离子的氧化峰电位,其峰电流值与银离子浓度在5.0×10-7~1.0×10-3mol·L-1范围内呈线性关系,方法的检出限(3S/N)为5.0×10-8mol·L-1.
修饰的碳纤维电极
示差脉冲阳极溶出伏安法
银离子
Polythiophene
Modified carbon fiber electrode
Differential pulse anodic stripping voltammetry
Silver ion
Abstract
Method of preparation and pretreatment of carbon fiber electrode (CFE) was described,and the CFE obtained was modified by electrochemical polymerization of the monomer thiophene.In the determination of Ag+-ion,the test solution in 0.1 mol·L-1 HNO3 was pretreated by reduction for 120 s at -0.5 V,where the Ag+-ion was complexed with polythiophene.Silver ion in the complex was then stripped from the electrode by differential pulse anodic stripping voltammetry with scanning in the range from 0 to 0.6 V,and the oxidation peak potential of silver ion was observed at 0.24 V,where linear relationship between values of peak current of Ag+-ion and its concentration was obtained in the range of 5.0×10-7-1.0×10-3mol·L-1.Detection limit (3S/N) of the method found was 5.0×10-8mol·L-1.
中图分类号 O657.1
所属栏目 工作简报
基金项目
收稿日期 2008/4/29
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备注金根娣(1964-),女,江苏扬州人,副教授,主要研究方向为电化学分析,药物分析.
引用该论文: JIN Gen-di,YANG A-xi. Stripping Voltammetric Determination of Silver Ion with Modifed Carbon Fiber Electrode as Working Electrode[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2008, 44(12): 1155～1158
金根娣,杨阿喜. 修饰碳纤维电极为工作电极-溶出伏安法测定银离子[J]. 理化检验－化学分册, 2008, 44(12): 1155～1158
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