The Canadian

Centre for Environmental Modelling and Chemistry

Models of Interest


CEMN Models

Selected CEMC Models

For a complete list of CEMC models go to the main models page.

  • AirWater Model Calculates the air-water exchange characteristics of a chemical based on its physical chemical properties and total air and water concentrations.

  • ChemCAN A Level III model of 24 regions of Canada. It estimates average concentrations in air, fresh surface water, fish, sediments, soils, vegetation, and marine near-shore waters.

  • EQC The EQC, or EQuilibrium Criterion, model uses chemical-physical properties to quantify a chemical's behaviour in an evaluative environment. The environment is fixed to facilitate chemical-to-chemical comparison.

  • Fish Model A single organism bioaccumulation model treating the steady-state uptake and loss of an organic contaminant by a fish.

  • FoodWeb A mass balance model of contaminant flux through an aquatic foodweb.

  • Level I Calculates the equilibrium distribution of a fixed quantity of conserved (ie. non-reacting) chemical, in a closed environment at equilibrium, with no degrading reactions, no advective processes, and no intermedia transport processes.

  • Level II Describes a situation in which a chemical is continously discharged at a constant rate and achieves a steady-state and equilibrium condition at which the input and output rates are equal.

  • Level III Describes a the fate of a chemical continuously discharged at a constant rate and has achieved a steady state condition in which input and output rates are equal but equilibrium between media is not assumed.

  • Sediment Model Calculates the water-sediment exchange characteristics of a chemical based on its physical chemical properties and total water and sediment concentrations.

  • Soil Model Calculates chemical partitioning between the air, water, organic matter, and mineral matter phases in a single layer of soil as a function of physical chemical properties and provides a very simple assessment of the relative potential for reaction, degradation and leaching.

  • STP Estimates the fate of a chemical present in the influent to a conventional activated sludge plant as it becomes subject to evaporation, biodegradation, sorption to sludges and to loss in the final effluent.

  • TaPL3 An evaluative tool to be used in the detailed assessment of chemicals for persistence and potential for long-range transport in a mobile medium in a steady-state environment.

  • QWASI Describes the steady state behaviour of an organic chemical in a lake subject to chemical inputs by direct discharge, inflow in rivers, and deposition from the atmosphere.


    Gobas Models, ToxLab at Simon Fraser University

  • AQUAWEB
    Provides site-specific estimates of chemical concentrations in organisms of aquatic food webs from chemical concentrations in the water and the sediment.

  • BAF-QSAR Provides estimates of the bioaccumulation factor (BAF) for “generic” fish species in lower, middle and upper trophic levels of aquatic food webs.

  • EcoFate
    Steady-state and time-dependent calculations of the mass transport and food-web bioaccumulation of organic chemicals in aquatic ecosystems.

  • Gobas
    A steady-state mass-balance model to assess the degree of bioaccumulation of hydrophobic organic chemicals in aquatic ecosystems.

  • San Francisco Bay Food-Web Bioaccumulation Model for PCBs
    Estimates the concentrations of PCBs in a set of key species that reside in the Bay as a result of PCB concentrations in sediments and water in the Bay.


    Wania Models, Wania Research Group, U. of Toronto at Scarborough

  • CoZMo-POP
    A dynamic multimedia fate and transport model designed to describe the long term fate of persistent organic pollutants in a coastal environment or the drainage basin of a large lake.

  • Globo-POP
    A zonally averaged multimedia model describing the global fate of persistent organic chemicals on the time scale of decades.

  • POPCYCLING-Baltic
    Describes persistent organic pollutant fate in the Baltic Sea environment.

  • ppLFER-based Level III
    A Level III fugacity model using poly-parametric linear free energy relationships (PP-LFERs) to quantify equilibrium phase partitioning in the environment.


    Non-CEMN Models

  • CalTox
    Relates the risk of adverse health effects to soil contamination levels. Department of Toxic Substances Control, California

  • EPI Suite (Estimation Program Interface)
    A suite of physical/chemical property and environmental fate estimation models developed by the EPA’s Office of Pollution Prevention Toxics and Syracuse Research Corporation (SRC). Includes the following estimation models: KOWWINTM, AOPWINTM, HENRYWINTM, MPBPWINTM, BIOWINTM, PCKOCWINTM, WSKOWWINTM, BCFWINTM, HYDROWINTM, and STPWINTM, WVOLWINTM, and LEV3EPITM. EPI SuiteTM was previously called EPIWIN.

  • EUSES (European Union System for the Evaluation of Substances)
    A decision-support instrument for rapid and efficient assessments of the general risks posed by substances to man and the environment. European Chemicals Bureau

  • PBT Profiler
    An assement tool that estimates environmental persistence (P), bioconcentration potential (B), and aquatic toxicity (T) of discrete chemicals based on their moleccular structure. U.S. Environmental Protection Agency

  • PA5
    PA5 (PRZM-AGRO version 5) is a modification of the EPA’s PE5 shell. It includes the CEMC SFU AGRO model and all the functionality of PE5.

  • SoilFug Model
    An agrichemical fate model. A.Di Guardo



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    Last updated August 12, 2011.