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首页> 外文期刊>Chromatographia >Effect of temperature and the mechanism of zone spreading during cation-exchange separation of rare earth elements by ion chromatography
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Effect of temperature and the mechanism of zone spreading during cation-exchange separation of rare earth elements by ion chromatography

机译：离子色谱法分离稀土元素阳离子交换过程中温度的影响和区域扩展的机理

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摘要

Separation of rare earth elements (REE) by ion chromatography on a Dionex Ion Pac CS3 column (sulfonic acid type) has been studied at different temperatures (10-70 degrees C) and with both isocratic and gradient elution with alpha-hydroxyisobutyric acid (alpha-HIBA). Changes of column efficiency as a function of distribution coefficient and temperature could not be explained on the basis of classical Van Deemter or Glueckauf-Hamilton equations and possible explanation indicating the contribution of longitudinal diffusion in the resin phase to total zone spreading was provided. It was shown that the plate height for yttrium was distinctly smaller that those for lanthanides of similar ionic radii. An improved combined isocratic-gradient elution procedure was devised for separation of Sc, Y, La, and the lanthanides in one run.
机译：在Dionex Ion Pac CS3色谱柱（磺酸型）上通过离子色谱法分离稀土元素（REE）的方法已在不同温度（10-70℃）下进行了研究，并使用α-羟基异丁酸（alpha -HIBA）。不能根据经典的Van Deemter或Glueckauf-Hamilton方程来解释柱效随分布系数和温度的变化，并提供了可能的解释来说明树脂相中的纵向扩散对总区扩展的贡献。结果表明，钇的极板高度明显小于类似离子半径的镧系元素。设计了一种改进的等度梯度洗脱组合方法，可一次分离Sc，Y，La和镧系元素。

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