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RE: Using Phreeqc for modeling redox reactions




I'm not sure what you want. I think your model of the thermodynamics of
iron and chromium reactions is adequate. You could add equilibrium with
Cr_hydroxide and Fe(OH)3(a) to simulate the formation of the precipitates.

As far as the lower concentrations of Cr taking more Fe, I can't think of
any reason that should happen thermodynamically. Perhaps it is a kinetic
phenomenon at the electrode.

David



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

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