ION-EXCHANGE SELECTIVITY OF A RESORCINOL-FORMALDEHYDE POLYCONDENSATE RESIN FOR CESIUM IN RELATION TO OTHER ALKALI-METAL IONS

Ion exchange isotherms for the ion-pairs Li+-Cs+, Na+-Cs+ and K+-Cs+ h ave been measured for a cesium selective resorcinol-formaldehyde polyc ondensate resin synthesized in the laboratory, The equilibrium data ha ve been used to calculate the thermodynamic equilibrium constants as w ell as standard free energies of ion exchange and thus arrive at a sel ectivity series for the above ions. The high selectivity towards cesiu m as compared to other alkali metal ions has been discussed in the lig ht of existing theories and models of ion exchange phenomena.