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MINTEQA2: Metal Speciation Equilibrium Model for Surface and Ground Water

MINTEQA2 is a geochemical equilibrium speciation model for dilute aqueous systems.
The model is an update of MINTEQ, which was developed by combining the fundamental mathematical structure of MINEQL with the well-developed thermodynamic database of WATEQ3.

MINTEQA2 can be used to calculate the equilibrium composition of dilute solutions in laboratory or natural aquatic systems. It can be used to calculate the mass distribution between dissolved, adsorbed, and multiple solid phases under a variety of conditions.
MINTEQA2 is accompanied by an interactive program PRODEFA2, that is used to create MINTEQA2 input files. With PRODEFA2, user can access species available in MINTEQA2 thermodynamic data base and define other aqueous, solid, and/or adsorption species not present in the data base.
MINTEQA2 user should have a scientific or engineering background with one year of introductory chemistry. Additional experience with thermodynamics is helpful.

Becauseof MINTEQA2's public domain status, extensive feedback has been received from users on needed corrections and enhancements.
This model was last updated and released by EPA's Center for Exposure Assessment Modeling (SEAM) in 1991, and is in need of updating. The MINTEQA2 model system is available for microcomputer (i.e., DOS) and UNIX systems


area: ground water
objectives: simulation, analysis
description: aquatic biology, water quality, chemical pollution, metals


Center for Exposure Assessment Modeling (CEAM)
U.S. Environmental Protection Agency
Office of Research and Development
Environmental Research Laboratory
960 College Station Road
Athens, Georgia 30605-2720
Tel. 706/546-3549
email: ceam@athens.ath.epa.gov

The software ca be downloaded at the EPA CEAM MINTEQ page.


David S. Brown and Jerry D. Allison
Computer Science Corporation,
Environmental Research Laboratory,
Athens, GA 30613


  • "MINTEQA1, An Equilibrium Metal Speciation Model, User's Manual". (EPA 600/3-87-012) NTIS Accession Number: PB88 144 167



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