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Solid solutions and PHREEQC


I wonder if you could please help.

I am trying to model a column expt using PHREEQC
The column is a mixture of sand and clay ( mixtures of illite, kaolinite, 
chlorite or montmorillonite) with known ionic exchange parameters.
I am adding to this a binary chloride salt mixture and want to model the 
breakthrough curves using exchange and transport keywords.
I have tried using the solid_solutions keyword to set the initial conditions in 
the column but am unable to do so.  My only other thought I guess is to set  
solution 1-x  using the formula for the clays.

Could you tell me if I am on the right track, sorry but I am new to this type of 
modelling and I am trying to learn as I work through so any help would be 
greatly received

Thankyou for your time

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