高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (11): 1651.

• 论文 • 上一篇    下一篇

聚茜素红膜修饰电极控制电位扫描法分别测定多巴胺和抗坏血酸

万其进, 喻玖宏, 王刚, 杨年俊   

  1. 湖北师范学院化学系, 黄石 435002
  • 收稿日期:1999-11-17 出版日期:2000-11-24 发布日期:2000-11-24
  • 通讯作者: 万其进(1957年出生),男,教授,主要从事电分析化学和生化分析研究.
  • 基金资助:

    湖北省教育委员会科研基金(批准号:98A042)资助

Respective Determination of Ascorbic Acid and Dopamine by Controlling Potential Sweeping on the Polyalizarin Red Film Modified Electrode

WAN Qi-Jin, YU Jiu-Hong, WANG Gang, YANG Nian-Jun   

  1. Department of Chemistry, Hubei Normal University, Huangshi 435002, China
  • Received:1999-11-17 Online:2000-11-24 Published:2000-11-24

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被引次数

161

摘要： 研究了聚茜素红膜修饰电极(PARE)的制备及其对多巴胺(DA)和抗坏血酸(AA)的电催化性能,结果表明,在PARE上DA和AA具有不同的循环伏安行为,前者表现为一个准可逆过程,后者则为不可逆过程,并且二者的氧化峰电位分开近200mV.因此可通过控制不同的电位范围进行分步扫描,实现了对同一体系中DA和AA的分别测定,DA的还原峰电流和AA的氧化峰电流分别在8.0×10-6～4.0×10-3mol/L和4.0×10-5～2.0×10-2mol/L范围内与各自的浓度呈线性关系;检测限分别为8.0×10-7mol/L和1.0×10-5mol/L.同时与导数伏安法一步测定进行比较,结果令人满意.

关键词: 聚茜素红膜修饰电极, 控制电位扫描法, 分别测定, 抗坏血酸, 多巴胺

Abstract: The preparation of polyalizarin red film modified electrode(PARE) and its electrocatalytic properties to dopamine(DA) and ascorbic acid(AA) were investigated. DA and AA have different voltammetric behaviour on PARE. The electrode reaction of DA on PARE is a quasi reversible process, but the oxidation of AA on PARE is a completely irreversible reaction. The oxidation peak of DA can be separated from that of AA about 200 mV on PARE. Passing through sweep for two times in different potential ranges, DA and AA can be detected in the same system respectively. The reduction peak current of DA is proportional to its concentration in the range of 8×10-6 —4×10-3 mol/L and the detect limit can reach 8×10-7 mol/L. The oxidation peak current of AA is linear with its concentration from 4.0×10-5 mol/L to 2.0×10-2 mol/L. Detect limit of it reaches 1.0×10-5 mol/L. Compared to the direct derivative voltammetry, the analysis results are very satisfactory.

Key words: Polyalizarin red film modified electrode(PARE), Controlling potential sweeping, Respective determination, Ascorbic acid, Dopamine

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