In 2005, the Visual MINTEQ thermodynamic databases were formatted for use with Geochemist’s Workbench. The zip file below contains three files, one thermodynamic database for GWB 5 or later, one for GWB 4, and one additional database for surface complexation reactions onto HFO (Dzombak & Morel, 1990). Extract all three files before use with GWB. The model employs a pre-defined set of components that includes free ions such as Na+ and neutral and charged complexes (e.g., H4SiO4, Cr(OH)2+). Descarga fiable para Windows (PC) de Visual MINTEQ GRATIS. Descarga libre de virus y 100% limpia. Consigue Visual MINTEQ descargas alternativas.

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Alternatives

Some other chemical equilibrium calculators which may be better suited to your needs, especially for more advanced calculations...
ChemEQL- Another free, simple equilibrium calculator, ChemEQL is a JAVA program (runs on Mac, Linux and Windows) that contains a small database with >2000 reactions. It has a simple, text-oriented interface and lots of documentation (95 page manual, including a quick-start section).
Visual Minteq- Visual Minteq is an updated, GUI version of the US EPA's MinteqA2 program used to calculate equilibrium speciation in natural waters. It has a simple interface, a nicely-updated thermodynamic database, and interfaces with Excel for graphic display. Windows only.
PHREEQc- The US Geological Survey maintains this very powerful program as freeware. PHREEQc performs not only equilibrium calculations, but chemical kinetics, reactive transport and inverse (pathway) modeling. It has a text-driven interface and requires a longer learning period than the programs listed above.
Additional information on these programs is available in the downloadable pdf 'Equilibrium Resources' (see below).

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