高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (5): 655.

• 论文 • 上一篇    下一篇

邻菲啰啉冠醚胺类电极选择性与萃取特性的关系

张增荣, 俞汝勤   

  1. 湖南大学化学化工系, 长沙, 410082
  • 收稿日期:1993-06-28 修回日期:1994-02-21 出版日期:1994-05-24 发布日期:1994-05-24
  • 通讯作者: 张增荣,男,28岁,博士.
  • 作者简介:张增荣,男,28岁,博士.
  • 基金资助:

    国家自然科学基金

The Relationship Between the Selectivity of Electrodes Based on Polyether Derivatives of o-Phenanthroline and Extraction Constants of Amine Species

ZHANG Zeng-Rong, YU Ru-Qin   

  1. Department of Chemistry and Chemical engineering, Hunan University, Changsha, 410082
  • Received:1993-06-28 Revised:1994-02-21 Online:1994-05-24 Published:1994-05-24

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摘要： 研究了邻菲啰啉冠醚电极的响性特性,测定了邻菲啰啉冠醚络合物的相关萃取平衡常数,并研究了其与电极性能的关系。实验表明,当PVC膜中无邻菲啰啉冠醚载体时,其与盐的脂溶性相关的平衡常数Kd反映了电极的选择性:季铵>伯胺>叔胺>仲胺>铵。PVC膜中邻菲啰啉冠醚载体化合物的引入,改变了电极的选择性次序:伯胺>季铵>叔胺>仲胺>铵,此时较能反映电极选择性次序的是萃取平衡常数Ke而不是Kd或络合物稳定常数Ka.

关键词: 离子选择性电极, 邻菲啰啉冠醚衍生物, 胺, 萃取常数

Abstract: Electrodes based on polyether derivatives of o-phenanthroline were prepared. The potentiometric response characteristics of the electrodes prepared were investigated.The extraction constants Ke of amine species were determined in the presence and absence of polyether derivatives of o-phenanthroline in the organic phase. The relationship between the electrode selectivity and Ke was examined. The benzylamine selective electrode based on polyether derivative of o-phenanthroline showed the following selectivity order: benzylamine >ethylamine>tetraethylammonium>triethylamine>diethylamine>ammonium. This was exactly the extraction constant sequence of the amine species. The PHEN19C7-based electrode was used to determine the Mexiletine content in pharmaceutical preparations with satisfactory results.

Key words: Ion-selective electrode, Polyether derivative of o-phenanthroline, Amine, Ex-traction constant

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