Column leaching experiments with 0.001 N CsCl with 1 N KCl or CaCl 2 showed Cs sorption by a number of clays to be much larger from Ca than from K solutions. The sorption affinity of Cs relative to the complementary ion corresponded with that found by others for the Cs‐K ion pair, but in Cs‐Ca systems the Cs was sorbed to a larger extent than would have been expected from the results of experiments where Cs‐Ca ratios in the equilibrium solution were not so small. While all except a very small proportion of the sorbed Cs was displaced on leaching with 1 N KCl, some 36 times as much remained after leaching with equal volumes of 1 N CaCl 2 . Vermiculite sorbed very large amounts of Cs (about 1/3 of exchange capacity) from 0.001 N CsCl‐1 N CaCl 2 . The sorbed Cs was largely “fixed” against exchange with 1 N CaCl 2 . This suggests that Cs contained in interlayer spaces of vermiculite results in interplanar distances which will admit K but not Ca.
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Coleman et al. (1963) studied this question.