A new and useful method has been developed for analytical evaluation of the distribution coefficient (Kd ) at an infinitesimal exchange. Kd values have an important role for the chromatographic separation of ions. This method is based on the extrapolation of the Kielland plot from an ion-exchange isotherm to zero loading. The usefulness of this method is exemplified by evaluation of Kd values for Cs+ on Al3+−substituted tobermorite which is known to exhibit high selectivity toward Cs+.
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Tsuji et al. (1991) studied this question.
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