> Could you give more details about the differences that exist between MINTEQ, MINTEQA2 and PHREQC. MINTEQ has been replaced with MINTEQA2. There may be a more recent version of MINTEQ as well. I think there is a more recent database anyway. PHREEQC can perform most of the same calculations as MINTEQA2 (the converse is not true). There is a database for phreeqc, minteq.dat, that is taken from the MINTEQA2 database, and results of calculations should be very similar between the two programs when this database is used. The main capability of MINTEQA2 that is not present in PHREEQC is the triple layer surface complexation model and an easier implementation of Langmuir and Freundlich isotherms. PHREEQC has only the diffuse-layer model of Dzombak and Morel, but is capable of making Langmuir and Freundlich calculations with appropriate definitions. PHREEQC has a capability to calculate the explicit composition of the diffuse layer in surface complexation modeling that is not present in MINTEQ (although this capability is rarely used). PHREEQC has several capabilities not present in MINTEQA2 including kinetic reactions, ion-exchange, multicomponent gas phase, and solid-solution calculations. PHREEQC also has 1D transport capabilities and inverse modeling capabilities. The user interface PhreeqcI is more advanced than prodef for MINTEQA2, at least as of the last time I used prodef. The MINTEQ series may have improvements that I don't know about, so this is only from my knowledge, but I think PHREEQC has more capabilities and is easier to use (an author's opinion). There is a 3D reactive transport model, PHAST, that builds directly on PHREEQC chemical definitions. 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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