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Brighton, England, May 2000 |
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D. W. Pennington Multimedia fate and exposure
models are used in a number of applications to estimate the
partitioning behavior of a chemical, its persistence, average
concentrations in each media of
a region and associated exposure levels. However, the number of
chemicals that can be modeled is often considered limited by the
availability of degradation half-life data, particularly for soils and
sediments. In this presentation, an approach is demonstrated that
facilitates the prediction of the multimedia partitioning behavior of a
chemical using only the atmospheric, and occasionally aquatic,
degradation rates. An extension of the same multimedia approach
is subsequently applied to predict the persistence, concentrations in
each media and human health exposure levels. The introduced error
is evaluated using data for 245 organic chemicals. The
predictions are generally conservative with error less than an order of
magnitude when compared to the full steady-state model estimates.
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