Updated:
26.10.2007
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 Welcome to GEM-Selektor
(GEMS)
Research package for thermodynamic modelling of aquatic
(geo)chemical systems by Gibbs
Energy Minimization
The GEMS code package offers high chemical
plausibility of equilibrium thermodynamic models
- Stable and metastable minerals are selected using rigorous phase
stability criteria
- Aqueous - solid solution equilbria may involve many (non)ideal
solid or liquid solutions, gas mixture and/or non-ideal fluids
- Multi-site-surface complexation on
mineral-water interfaces can be computed in elemental stoichiometry,
without site balances
- (Ad)sorption models can be considered together with other
solution phases
- Redox state is calculated from the bulk chemical composition of
the
system
- Processes of irreversible chemical mass
transfer can be simulated using principles of local and partial
equilibrium
- Thermodynamic data are automatically corrected for temperature
and pressure
- Various inverse (geo)chemical problems can be solved
- and much more...
The complexity of chemical system setup is limited mainly by the
availability of
thermodynamic data for species and phases. A default thermodynamic database is the Nagra/PSI
chemical thermodynamic data base 01/01, enhanced with the
imported SUPCRT database. Third-party databases for specific
applications, for instance for cements, will be
available soon in GEMS format (see Latest
News).
To learn quickly how to work with the user-friendly GEMS code:
- download it; install; in your web browser, click on
the "Online Tutorial"
link to the left, and run the code in parallel with reading the
Screenshot Tutorial.
If you experience problems, please go to a "Support" link and
send us a bug report form.
GEMS software package is distributed "as is" by the
Laboratory for Waste Management (LES) of the Paul Scherrer Institute
(PSI) with two purposes:
- to promote the GEM method and software into a worldwide academic
research community;
- to gather the users feedback - vital for making the software
functional and reliable.
Permission to use the GEM-Selektor software is hereby granted free
of charge for educational
and academic research purposes, subject to Terms and Conditions of
Use.
GEMS Development and
Support Team
Disclaimer
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