Hello Jia,
thanks for your answer. Actually I want to model the retardation of ions in a natural soil sample where I know the mineral composition: Quartz (76.0%), Albite (5,7%), Orthoclase (3,4%), Microcline (6,6%), Illite (2,6%), Kaolinite (2,6%), Montmorillonite (3,1%). With your help I managed to include them all into a calculation at the same time using kinetics. I also created an surface complexation modelling dataset using an bottom-up approach. But wand to include ion-exchange for several minerals - at least Montmorillonite, Illite and Kaolinite - because Ion-Exchange is a major contribution process on retadration. So my problem is to include mineral specific Ion-exchange data and I am looking for a way to simultaniously include Ion-exchange data for Montmorillonite, Illite and Kaolinite. Is this somehow possible?
I just wonder if this could be realized by having different exchange-sites (>X:Na, >Y:Na, >Z:Na)? But then the exchange capacity is not mineral-specific.
Many thanks and best regards,
Frank