> how can I calculate the partial pressure of co2 with hydrochemical data by phreeqc computer program? The log PCO2 is equal to the value printed for the saturation index of CO2(g) in the PHREEQC output. The value should be printed for all calculations, including initial distribution of species calculations (whenever SOLUTION data are defined). 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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