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 Project web page: http://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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