应用化学

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多贝斯在石墨烯修饰玻碳电极上的电化学行为及其测定

张亚1*,杜芳艳1,郑建斌2   

  1. (1.榆林学院化学与化学工程学院榆林 719000;2.西北大学分析科学研究所 西安 710069)
  • 收稿日期:2013-09-24 修回日期:2013-11-12 出版日期:2014-07-10 发布日期:2014-07-10
  • 通讯作者: 张亚,教授; Tel:0912-3891144; Fax:0912-3687868; E-mail:zhangya1103@126.com; 研究方向:电分析化学
  • 基金资助:
    陕西省科技厅项目(2010JM2017);榆林学院项目(10GK02)

Electrochemical Behavior and Determination of Calcium Dobesilate at Graphene Modified Glassy Carbon Electrode

ZHANG Ya1*, DU Fangyan1, ZHENG Jianbin2   

  1. (1.Department of Chemistry and Chemical Engineering,Yulin College,Yulin  719000,China;
    2.Institute of Analytical Science,Northwest University,Xi′an 710069,China)
  • Received:2013-09-24 Revised:2013-11-12 Published:2014-07-10 Online:2014-07-10

摘要: 制备了石墨烯修饰玻碳电极(GN/GCE)。 在0.05 mol/L H2SO4溶液中,用循环伏安法研究了多贝斯在GN/GCE上的电化学行为。 结果表明,GN/GCE对多贝斯的氧化还原反应有明显的电催化作用。 建立了测定多贝斯的新方法,用微分脉冲伏安法测得多贝斯的氧化峰电流与其浓度在2.0×10-9~1.2×10-6 mol/L范围内呈线性关系,检出限为1.0×10-9 mol/L(S/N=3)。 该法可用于胶囊中多贝斯的测定,修饰电极有较好的稳定性和重新性。

关键词: 多贝斯, 石墨烯, 修饰电极, 电催化

Abstract: A graphene modified glassy carbon electrode(GN/GCE) was prepared. The electrochemical behavior of calcium dobesilate on the modified electrode was investigated in 0.05 mol/L H2SO4 by cyclic voltammetry. The GN/GCE shows an obvious electrocatalytic activity toward the redox reaction of calcium dobesilate and a new method for the determination of calcium dobesilate is established. On differential pulse voltammetry curves, a linear dependence of oxidation current versus calcium dobesilate concentration is obtained in the range of 2.0×10-9~1.2×10-6 mol/L, with a detection limit of 1.0×10-9 mol/L(S/N=3). The proposed method was applied to determine calcium dobesilate in capsule. The modified electrode shows excellent stability and reproducibility.

Key words: calcium dobesilate, graphene, modified electrode, electrocatalysis

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