Abstract
Intermediate-silica sedimentary chabazite contained in two chabazite-rich tuffaceous rocks has been evaluated as potential cation exchanger for radioactive cation removal from nuclear waste streams. Exchange isotherms have been obtained for the cationic couples Na/Ba, Na/Co, Na/Cs and Na/Sr and the relevant thermodynamic parameters calculated with the help of a computer program. Sedimentary chabazite turns out very selective for Cs +, fairly selective for Ba 2+ and Sr 2+, especially at low equivalent fraction of these cations in solution, and unselective for Co 2+. An explanation of the observed selectivities is attempted on the basis of the structural features of chabazite.
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