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Geochemical Modeling-Computer Codes

Ground Water Hydrology

  1. Mário Abel Gonçalves

Published Online: 15 JUL 2005

DOI: 10.1002/047147844X.gw246

Water Encyclopedia

Water Encyclopedia

How to Cite

Gonçalves, M. A. 2005. Geochemical Modeling-Computer Codes. Water Encyclopedia. 5:140–142.

Author Information

  1. Faculdade de Ciências da Universidade de Lisoba, Lisoba, Portugal

Publication History

  1. Published Online: 15 JUL 2005


Geochemical modeling practices are increasingly using a wealth of available computer codes specifically designed for such purposes. Although obtaining the codes is fairly easy nowadays, the uncritical use of these codes should be avoided at all cost. Each of the computer codes presented has their own limitations. Users must also critically evaluate the thermodynamic databases available for each program. Among the codes described, one puts more emphasis on the hydrogeochemical codes developed by the United States Geological Survey (USGS) and US Environmental Protection Agency (USEPA) mostly because these institutions provide a wide range of codes, an important number of which are regularly updated. Besides, codes available from other institutions are also referred to, a few of them being commercial programs. A final note is given about a new class of object-oriented platform-independent programs, whose main objective is to provide a framework for building specialized geochemical models.


  • geochemical models;
  • thermodynamic databases;
  • reaction-path models;
  • inverse models;
  • coupled reactive-transport models;
  • solubility-speciation models;
  • open-source codes;
  • USGS;
  • EPA