The llnl.dat database released with PHREEQC and PhreeqcI contains the elements Cr, Mo, and V. This database is essentially the same as the databases used by EQ3/6 and Geochemist's Workbench. I have little experience in modeling these trace metals, so I do not have an understanding of the goodness of the thermodynamic data for these elements. However, the llnl.dat database could serve as a starting point for your investigations. The minteq.dat database has Cr and V, which you could check for consistency with llnl.dat. I suspect sorption (SURFACE definitions in PHREEQC) will be important for these trace metals, so you may have to develop a surface complexation model for the elements as well. 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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