You asked for charge balance with sulfate, so the program adjusted the sulfate concentration to achieve charge balance. Thus, there is more sulfate than you calculate from the input data (~400/96). If you remove the "charge" from the line, you should get what you expect, although there is a small correction in going from mg/L to mol/kg water. 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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