Your input file ran with version 2.4.2 (Version 2015 of PhreeqcI). https://wwwbrr.cr.usgs.gov/projects/GWC_coupled/phreeqc. It runs a little easier if you include the following at the top of the file: KNOBS -diagonal I suspect the problem is very small concentrations of iron at the given oxygen concentrations. The -diag helps scale the equations a little better. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225
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