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The sorption behaviour of Ba 2+  in three different clay minerals from various regions of Turkey has been investigated by means of a tracer technique using  133 Ba in batch experiments. Sorption of Ba 2+  on montmorillonite, kaolinite and illite has been studied in mixed solutions of BaCl 2  and NaCl at ionic strengths ranging from 1×10 -3 M to 1×10 -1 M. The L-shape exchange isotherms for Ba 2+ -Na +  systems are well defined by a Langmuir type equation. The exchange capacity of Ba 2+  ions for all three clay minerals increased with decreasing ionic strength. The adsorption data were fitted to a Freundlich isotherm and empirical Freundlich parameters enabled to the generation of a site distribution function. The selectivity coefficients were nearly constant at low Ba loading and decreased as loading increased. This behavior was an indication of an ion exchange process between Ba 2+  and Na +  ions.

Adsorption of barium on kaolinite, illite and montmorillonite at various ionic strengths