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Evaluating the environmental fate of a variety of types of chemicals using the EQC model

Authors

  • Donald Mackay,

    Corresponding author
    1. Institute for Environmental Studies, University of Toronto, Toronto, Ontario M5S 3E8, Canada
    Current affiliation:
    1. Environmental & Resource Studies, Trent University, Peterborough, ON K9J 7B8, Canada
    • Institute for Environmental Studies, University of Toronto, Toronto, Ontario M5S 3E8, Canada
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  • Antonio Di Guardo,

    1. Institute for Environmental Studies, University of Toronto, Toronto, Ontario M5S 3E8, Canada
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  • Sally Paterson,

    1. Institute for Environmental Studies, University of Toronto, Toronto, Ontario M5S 3E8, Canada
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  • Christina E. Cowan

    1. Procter & Gamble Company, Environmental Safety Department, Ivorydale Technical Center, Cincinnati, Ohio 45217, USA
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Abstract

The multimedia equilibrium criterion model, which can be used to evaluate the environmental fate of a variety of chemicals, is described. The model treats chemicals that fall into three categories. In the first the chemicals may partition into all environmental media, in the second they are involatile, and in the third they are insoluble in water. The structure of the model, the process equations, and the required input data for each chemical type are described. By undertaking a sequence of level I, II, and III calculations, increasing information is obtained about the chemical's partitioning, its susceptibility to transformation and transport, and the environmental process and the chemical characteristics that most influence chemical fate. Output data, consisting of tables and charts, give a complete picture of the chemical's fate in an evaluative or generic environment. The model is illustrated by applying it to two chemicals, pyrene, which is a chemical of the first type, and lead, which is of a second type. The role of this model as a tool for assessing the fate of new and existing chemicals is discussed.

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