邻菲啰啉冠醚胺类电极选择性与萃取特性的关系  

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

作　　者：张增荣[1] 俞汝勤[1] 

机构地区：[1]湖南大学化学化工系

出　　处：《高等学校化学学报》1994年第5期655-658,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

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Ｋ_ｄ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Ｋ_ｅ而不是Ｋ_ｄ或络合物稳定常数Ｋ_ａ．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.

关 键 词：邻菲LUO啉 冠醚 萃取 离子选择电极 

分 类 号：O646.54[理学—物理化学]