ION-EXCHANGE IN CHABAZITE

Several near homoionic forms of a purified natural chabazite from Bowi e, Arizona have been prepared. Ion-exchange isotherms have been measur ed for the uptake of caesium and strontium onto each of the forms of c habazite using radiochemical methods. Selectivity series were construc ted based on free energies of exchange (Delta G degrees) calculated fr om Kielland plots derived from the isotherms. Values of Delta H degree s and Delta S degrees were also derived. Comparisons are made to other literature values of these thermodynamic functions. Comments are made on the potential use of the natural chabazite in the treatment of aqu eous nuclear waste. (C) 1998 Elsevier Science B.V. All rights reserved .