Effect of crown ethers on the ion-exchange behavior of alkaline earth metals. Toward improved lon exchange methods for the separation and preconcentration of radium

被引：36

作者：

Dietz, ML ^{[1
]}

Chiarizia, R ^{[1
]}

Horwitz, EP ^{[1
]}

Bartsch, RA ^{[1
]}

Talanov, V ^{[1
]}

机构：

[1] TEXAS TECH UNIV,DEPT CHEM & BIOCHEM,LUBBOCK,TX 79409

来源：

ANALYTICAL CHEMISTRY | 1997年 / 69卷 / 15期

关键词：

D O I：

10.1021/ac9700437

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The effect of selected crown ethers on the uptake of alkaline earth cations by sulfonic acid and diphosphonic acid-based cation-exchange resins from hydrochloric acid media is examined. The effect observed is shown to vary with the hydrophobicity of the crown ether, Water-soluble crown ethers enhance the sorption of certain cations, thereby improving the selectivity of the resin for other alkaline earths over calcium ion, an apparent result of a synergistic interaction between crown ether present in the resin phase and the ionic functional groups of the resin. In the presence of more hydrophobic crown ethers, a decrease in cation sorption is often observed, a result of the exclusion of the crown ether from the resin phase and the formation of cation-crown complexes in the solution phase, The result can be a reversal of the selectivity sequence ordinarily exhibited by the resin.

引用

页码：3028 / 3037

页数：10

共 61 条

[21] SEPARATION AND PRECONCENTRATION OF ACTINIDES FROM ACIDIC MEDIA BY EXTRACTION CHROMATOGRAPHY [J].