Hi Tom,
We have a doubt about the saturation index calculation.
We are using this formula to calculate the saturation index:
IS=Log (IAP/Ks) where, IAP= [Ca][sO4]
Using the values obtained from the aqueous species after running the SpecE8 program, we calculated a saturation index of -0.0191. It means the solution is nearly equilibrium in gypsum. We are sending you the attached of the results and we copy in this message.
Aqueous species molality act. coef.
------------------------------------------------------------
SO4-- 0.01410 0.4205
Ca++ 0.008221 0.4613
But if we compare the saturation index calculated by us and the obtained from the program (-0.1443), there is a difference.
Our questions are, How does the program calculate the saturation index? or what other variables are taking account to saturation index?
This is very important for us, because we are trying to explain the formation of a gypsum deposit.
Thank you very much.
Water_Sandra_output.txt