PHREEQC LINUX FREE DOWNLOAD

Journal of Hydrology, v. A colour monitor with a recommended resolution of at least by pixels. An additional algorithm is used to find all sets of minerals that are feasible solutions to the inverse problems. The option to change the tolerance used by the solver is an attempt to remedy this problem. The code may also serve well as a geochemical module for coupled reaction and transport models.

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These terms have been fitted for the major ions using chloride mean-salt activity-coefficient data Truesdell and Jones, It also has the capability to include any of these types of chemical calculations in a 1D advective transport system. No systematic attempt has been made to determine the aqueous model that was used to develop the log K's or whether the aqueous model defined by the current database file is consistent with the original experimental data.

All rights reserved Site map Contact us. At present, the numerical method has proved to be relatively robust. An additional algorithm is used to find all sets of minerals that are feasible solutions to the inverse problems.

A new database, minteq. The equations are solved by a modified Newton-Raphson calculation. This transport capability is simple and relatively fast, so it is appropriate for initial investigations of the chemistry of a dynamic system, before effort is expended on an expensive multidimensional, multicomponent transport model.

Careful selection of aqueous species and thermodynamic data is left to the users of the program. In many field studies, ion-exchange modeling requires experimental data on material from the study site for appropriate model application.

PHREEQC Version 3

Subversion has been introduced phreec version control system. METHODS For speciation, reactions, and transport calculations, the code solves a reduced set of simultaneous non-linear equations that define equilibrium for a water, solute, gas, mineral, ion-exchanger, and surface-complexer chemical system.

The code may also serve well as a geochemical module for coupled reaction and transport models. In addition, inequality constraints are included to ensure that any adjustments to the analytical phreesc are smaller than the uncertainties and to constrain the sign of mole transfers of mineral if specified. In inverse modeling, one aqueous solution is assumed to react with minerals and gases to produce the observed composition of a second aqueous solution.

Some modifications are needed to setup a C program on a Macintosh. The program has been compiled and run under DOS, Windows, and Linux, and on the following work stations: Data may be plotted against distance at a particular time, against time at a particular distance, against other data at a particular time or distance, or several data versus distance plots can be animated within a specified time interval.

Inclusion of uncertainties in the process of identifying inverse models phreeqf a major advance. Thus, in sodium chloride dominated systems, the model may be reliable to higher ionic strengths. It is suspected that the latter case is caused by loss of numerical precision in working with sparingly soluble minerals that is, small aqueous concentrations in systems with large total concentrations on the order of moles. Large inverse calculations may take several minutes to complete.

No restrictions are known for DOS and Unix operating systems. The option to change the tolerance used by the solver is an attempt to remedy this problem.

USCD1207 PHREEQC, PHREEQCI.

To submit a request, click below on the link of the version you wish to order. Most of the log K's and enthalpies of reaction have been taken from various literature sources. No attempt has been made to include other or more complicated exchange models. However, the program lacks linuz kinetics and the capability to model dispersion. Once a file is specified, several options allow the user to choose exactly how to extract the data of interest.

This package is the version 2. The user interface is improved through the use of a simplified approach to redox reactions, which includes explicit mole-balance equations for hydrogen and oxygen; the use of a revised input that is modular and completely free format; and the use of mineral names and standard chemical symbolism rather than index numbers.

Other uncertainties occur in determining the number of sites, the surface area, the composition of sorbed species, and the appropriate log K's. The database files provided with the program should be considered to be preliminary.

Rotterdam, Netherlands, and Brookfield, Vermont, A. Subsets of this set of equations are solved for a particular geochemical calculation. Inverse modeling is based strictly lonux a mole-balance approach and does not rely on the ion-association model except to determine the total number of moles of each element and redox state in each aqueous solution.