>Could PHREEQC be used for modeling petroleum brines (20,000 to 150,000 ppm)? My main interest would be in speciation, SI, mixing, forward modeling and inverse modeling. PHREEQC has an ion-association model, which is limited to the lowest concentrations that you mention. The program will make calculations at higher concentrations, but I think the aqueous model would be suspect. You really need a Pitzer (specific ion interaction) model for the high ionic strengths. Geochemist's Workbench, EQ3/6, TEQUIL, SOLMINEQ, and PHRQPITZ implement Pitzer models. I maintain PHRQPITZ, but I don't advocate its use. It is old and difficult to run, although I am confident that it does the calculations correctly. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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