Abstract
Reversed phase partition chromatography with HDEHP retained on kieselguhr as the stationary phase was applied to the separation of rare earths. The influence of the amount of HDEHP on the height of the plate has been studied. Up to 10 % of HDEHP (with respect to the amount of kieselguhr) the height of the plate is about 0.33 mm which makes possible very clear separations of adjacent rare earths at room temperature. No gradient elution technique was found necessary for the separation. The height of the plate can be decreased to less than 0.2 mm by using a specially selected fraction of kieselguhr. Microamounts of Tb were separated from macroamounts of Er. The amount of Er retained on the column and separated from Tb was found to be proportional to the amount of HDEHP. It was found that the width of the elution peak of heavy rare earths is much greater with HCl than with HNO 3 as eluting agent.
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