PHREEQC has the capability to model multicomponent ideal and
binary nonideal solid solutions. For ideal solid solutions, the activity of
each end member solid is equal to its mole fraction. For nonideal solid
solutions, the activity of each end member is the product of the mole
fraction and an activity coefficient, which is determined from the mole
fraction and Guggenheim excess free-energy parameters. Example 10 considers
an aragonite (CaCO3)-strontianite (SrCO3) solid solution and demonstrates
how the composition of the solid solution and the aqueous phase change as
strontium carbonate is added to an initially pure calcium carbonate system.
The example can be run using the
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