Abstract: Electrochemical behaviour of Eu(Ⅲ)-Oxine system at a Nafion polymer film electrode was studied by using single sweep voltammetry. The results showed that the electroreduction of Eu(Ⅲ)-Oxine complex in acetic buffer solution (pH5.6) at a Nafion film electrode appeared at about -0.93V(vs.SCE). Under an optimal condition, the peak current is proportional to the concentration of Eu(Ⅲ) in the range from 1.0×10^-7to 1.0×10^-5mol/L. Eu₂O₃ content inluminous material has been determined by this method. On the basis of the results of a series comparative experiments, the possible mechanism of electrochemical reaction of Eu(Ⅲ)Oxine complex has been proposed. Chronocoulometry was applied to determine the apparent diffusion coefficient of charge transportin polymer film and the mean of which is (2.0±0.4)×10^-11cm²/s.

Key words: seuropium, chemically modified electrode, Nafion film, chronocoulometry

摘要： 研究了铕(Ⅲ)－８－羟基喹啉体系在Nafion薄膜化学修饰电极上的电化学行为。确定了测定铕(Ⅲ)的最佳测试条件，并用该法测定了发光材料中Eu₂O₃的含量。用计时库仑法测定铕(Ⅲ)在Nafion/GC修饰电极上的有效电荷迁越扩散系数，其值为(2.0±0.4)×10^-11cm²/s。通过对照实验，提出了电极反应的可能机理。

关键词: 铕, 化学修饰电极, Nafion薄膜, 计时库仑法