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Re: PhreeqC version 2 bugs?

> 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

      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 Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225

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