It is possible to use the model for the calculations you describe. As the model is distributed, the minteq.dat database has some EDTA species. You can either use this database, or I would prefer adding the species to one of the other databases (phreeqc.dat, wateq4f.dat, or llnl.dat). I am not very confident of this version of the minteq database. You should probably check the EDTA constants in any event. Given EDTA thermo data, you can use PHREEQC for local equilibrium modeling. If you want kinetics, it is still possible, but more work to define the reactions and the rate expressions. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Thabo Kumaran <TKumaran@xxxxxxxx To: dlpark@xxxxxxxx arch.co.nz> cc: In-Reply-To: <3A6E0564.386D9D4F@xxxxxxxxxxx> Subject: usage of PHReeqc 01/24/01 03:27 AM Dear sir, I am interested in your model. I am just wondering whether PHREEqc could be used to model the Metal-EDTA transport process in soil. It should be able to simulate the metal-EDTA complexation during EDTA leaching through a contaminated soil and also do calculations for transfomations reactions like metal-EDTA to Fe-EDTA inlater times. Could you comment on this pls. Regds Thabo
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