> The problem is that in the input file I say that the F- concentration should be 5e-6, but when PHREEQEC is calculating the F- concentration becomes 5.232e-006. You are entering mol/L and PHREEQC is converting the concentrations to mol/kg water. You have concentrations of about 1 mol/L for some constituents and the conversion to mol/kg water involves density (assumed 1.0) and subtracting the mass of the solutes to find the mass of water. The concentrations in mol/kgw are calculated by dividing by the calculated mass of water. If you set the units to mol/kgw, no conversion will be necessary. 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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