The Canadian

Centre for Environmental Modelling and Chemistry

Generic Fugacity Model

This BASIC program is a modified version of the evaluative Level I, II, and III fugacity models treating a 100,000 km2 area. Fewer user inputs are required for the Level III case; a generic set of intermedia transfer rates are assumed. This model treats organic chemicals and ions.

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.

A more detailed description is included in Volume IV of "The Illustrated Handbook of Physical Chemical Properties and Environmental Fate for Organic Chemicals" by D. Mackay, W.Y. Shiu, and K.C. Ma published by CRC Press, FL. 1994. This model was based on an earlier "Generic" model published in Chemosphere Vol. 24, p. 695, 1992.

The required input data are:

  • chemical name
  • molecular mass
  • data collection temperature
  • melting point
  • water solubility
  • vapour pressure
  • log Kow
  • dissociation constant
  • for ions only, pH of data and environment
  • reaction half-lives in each medium
  • emission rates for Level III

    • Model output includes for each Level as appropriate:

  • partition coefficients
  • Z and D values
  • fugacity of the system or of each compartment
  • reaction and advection loss rates
  • concentrations and amounts in each compartment
  • residence times

    • System requirements to run the compiled program are minimal.

    Please read the GENERIC 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 August 12, 2011.