Abstract
A radioactive tracer method was used to study the concentration-dependence of the equilibrium distribution coefficient characteristic for the exchange of caesium and rubidium ions on potassium cobalt hexacyanoferrate. The number of active centres was determined with the application of the Langmuir-Hückel isotherm. It was found that the sorption sequence Cs+ > Rb+ holds only at relatively low concentrations, the sequence being reversed at higher concentrations: Rb+ > Cs+. The factor characterizing the energetic inhomogeneity of the sorbent surface was determined from the temperature-dependence of the number of active centres. Determination of this factor is essential as regards evaluation of the results of kinetic measurements.
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