> When I try to equilibrate Hematite (Fe2O3) in pure water (pH=7, temp=25)
using EQUILIBRIUM_PHASES data block, I get the following messages:
If it does not say "ERROR" anywhere in the file, then it should be ok.
PHREEQC has a hard time with solutions that have no redox buffering (pure
water) and with small concentrations (<1e-13). Your problem has both. You
can get rid of the warnings if you include the following in your input
file:
SOLUTION_SPECIES
H2O + 0.01e- = H2O-0.01
log_k -9
Adding this species generates some redox buffering.
> I get input errors when I try to do multiple reactions in NaOH solutions,
but runs fine with HCl. What's going on?
I don't know. If you send the file with errors, I can probably tell you.
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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