PAn/Pt修饰电极的电色效应及其在滴定分析中的应用  

ELECTROCOLORATION EFFECT OF PAn/Pt MODIFIED ELECTRODE AND ITS APPLICATION IN TITRIMETRY

作　　者：钟平[1] 黄承玲[2] 王青豪[1] 

机构地区：[1]赣南师范学院化学系,赣州341000 [2]赣州市环境监测站

出　　处：《理化检验（化学分册）》2002年第12期595-596,599,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：采用恒电位电解聚合的方法制备了聚苯胺修饰电极 (PAn/Pt) ,循环伏安法分析表明 ,该电极在无机酸溶液中是电活性的 ,且随着颜色的变化呈现不同的电位响应 ,应用于滴定分析中具有灵敏度高、不污染溶液等特点 ,是一种有价值的显色指示电极。The method of potentiostatic electrolytic polymerization was used in the preparation of the PAn/Pt modified electrode. The results of cyclic voltammetric study showed that the modified electrode was electroactive in inorganic acid mediums and that different potential responses were observed accompanied by change in different colors. A more sensitive color change was observed by using this PAn/Pt modified electrode as an indicator electrode in the titration of Fe(Ⅱ) with Ce 4+ and a more sharp end point was obtained as compared with the use of o-phenanthroline-Fe(Ⅱ) complex as inside indicator, which was considered to be a pollution to the titration solution in some cases. It was considered that this PAn/Pt modified electrode with its electrocolor changing effect was more profitable and valuable to be used as an indicator electrode in redox titrimetry.

关 键 词：循环伏安法 PAn/Pt修饰电极 电色效应 滴定分析 聚苯胺修饰铂电极 恒电位电解聚合 

分 类 号：O657.1[理学—分析化学]