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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