The adsorption of lanthanum, dysprosium, holmium, and ytterbium on kaolinite, illite and smectite has been studied. The kaolinitic and illitic materials discriminate well between the rare earths, and indicate that there is a gradual increase in adsorption-strength from lanthanum to ytterbium. This corresponds to the variation of ionic potential for the naked ions, i.e. the distance of closest approach is determined by the crystallographic and not by the hydrated radius. A discussion oflanthanide adsorption on clay minerals in relation to geological processes is given in the end.
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Per Aagaard (1974) studied this question.
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