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GEM-Selektor

Interactive Package for Thermodynamic Modelling of Aquatic (Geo)Chemical Systems by Gibbs Energy Minimization. GEMS code package offers high chemical plausibility of (partial) equilibrium thermodynamic models.

  • Stable and metastable phases are checked using rigorous criteria based on phase stability index.
  • Aqueous equilibria may involve many (non)ideal solid or liquid solutions, gas mixture or non-ideal gaseous fluids.
  • Multi-site-surface complexation on mineral-water interfaces can be computed, also without site balances.
  • Redox state is calculated from the bulk chemical composition of the system via the GEM dual solution.
  • Processes of chemical mass transfer can be simulated using principles of local and partial equilibrium.
  • Simple cases of reactive transport (water-rock interaction, 1-D columns) can be simulated in GEM2MT module.
  • Built-in default chemical thermodynamic database is provided; third-party databases are also available.
  • Thermodynamic data is automatically corrected for temperature and pressure of interest.
  • Qt5- based Graphical User Interface with plotting of results and a context-sensitive run-time help system.
  • Installers available for all major PC platforms.

To use any GEMS codes, start by creating a modeling project (chemical system) in GEM-Selektor. The complexity of chemical system setup is limited mainly by the availability of thermodynamic data for species and phases.

  • Selektor Single System
  • Selektor Process
  • Selektor Database

Licensing

GEM-Selektor graphical user interface and database package: GNU General Public License (GPL) v3

The GEM-Seketor package is open-source, distributed under the GNU General Public License (GPL) v3. It is available free of charge for developers affiliated with non-profit educational and research institutions for educational and research purposes only, subject to the Terms and Conditions of Use of GEM Software.