A library with over 1600 thermodynamic stability constants allows quick access, comfortable creation of input matrices and hence easy use of the program. Two dimensional logarithmic diagrams, such as pe-pH, can be calculated. One rate determining process in a system of otherwise fast thermodynamic chemical equilibrium can be simulated. Corrections for ionic strength can be made and activities calculated.
Adsorption on up to five different particulate surfaces can be modeled with the choice of the Constant Capacitance, Diffuse Layer (Generalized Two Layer), Basic Stern Layer, or Triple Layer model to consider surface charges. It handles homogeneous solutions, dissolution, precipitation, titrations with acids, bases, or other components. Visual MINTEQ is a powerful and easy-to-use chemical equilibrium modeling system to determine the activities and speciation of many soil consituents using a database of equilibrium constants.Ī program for calculating speciation of major, trace, and redox elements in natural waters.ĬhemEQL calculates and draws thermodynamic equilibrium concentrations of species in complex chemical systems.
to determine the activities and speciation of many soil consituents using a database of equilibrium constants. MINTEQA2 is a geochimical program designed by the U.S.E.P.A. PHREEQC is based on an ion-association aqueous model and has capabilities for (1) speciation and saturation-index calculations (2) batch-reaction and one-dimensional (1D) transport calculations involving reversible reactions, which include aqueous, mineral, gas, solid-solution, surface-complexation, and ion-exchange equilibria, and irreversible reactions, which include specified mole transfers of reactants, kinetically controlled reactions, mixing of solutions, and temperature changes and (3) inverse modeling, which finds sets of mineral and gas mole transfers that account for differences in composition between waters, within specified compositional uncertainty limits. PHREEQC version 2 is a computer program written in the C programming language that is designed to perform a wide variety of low-temperature aqueous geochemical calculations.