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Three degrees of complexity are treated in the EQC, or EQuilibrium Criterion, Model. Levels I and II assume thermodynamic equilibrium is achieved; Level II includes advective and reaction processes. Level III is a non-equilibrium, steady-state assessment of chemical fate in the environment.
Three types of chemicals are treated: chemicals that partition into all media (Type 1), involatile chemicals (Type 2), and chemicals with zero or near-zero solubility (Type 3).
This model is useful for establishing the general features of a new or existing chemical's behaviour, ie. the media into which the chemical will tend to partition, the primary loss mechanisms, and its tendency for intermedia transport. The result of various emission scenarios can be explored.
Features of the EQC Model:
Provides a database of chemicals and chemical properties.
Permits temporary additions/changes of chemicals and their properties to a simulation.
Permits permanent additions, changes and deletions of chemicals and their properties to the database.
Provides standard environment for chemical comparison.
Does NOT permit changes to the standard environment.
Provides context-sensitive Help.
Displays and prints the model calculations, as performed by the program.
Allows the printing of simulation tables, the summary diagrams, and a small selection of charts.
Allows the program results to be saved as a comma separated value file, readable by many spreadsheet programs such as Excel.
A more detailed description of the model is given in the three paper set:
The required input data are:
Model output for each Level as appropriate includes:
This program is only available in compiled form. A "readme.txt" file with more detailed technical information is included in the zipped file.
Minimum system requirements:
Pentium-75MHz with 8 Mb of RAM running Windows 95. On some systems it may be necessary to adjust your screen resolution.
The EQC Model Version 1.01, released May 1997 and updated Nov 1997, continues to be available.
For non-Windows users the BASIC, evaluative, Level I, II and III fugacity models are available.
Please read the EQC SOFTWARE LICENSE before downloading the software. Use of the software constitutes your agreement to abide by the terms and conditions set out in the license agreement.
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Last updated June 10, 2013.