Ion Exchange Mechanism and Isotherms from Deep Bed Performance

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Abstract
The rate laws for diffusion controlled chromatographic ion-exchange are discussed in connection with their application to deep beds of exchanger. Results of experiments with a carboxylic acid resin indicate that solid diffusion is the rate-determining step under the conditions of the experiments. An estimate is found for the value of the diffusion constant. The information is applied to the computation, from a chromatographic elution, of a cesium-sodium isotherm for the exchanger. This result is compared with a direct determination of the isotherm.
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