Journal
RISK ANALYSIS
Volume 23, Issue 3, Pages 489-496Publisher
BLACKWELL PUBLISHERS
DOI: 10.1111/1539-6924.00329
Keywords
predicted environmental concentration; uncertainty; variability
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European directives require that all veterinary medicines be assessed to determine the harmful effects that their use may have on the environment. Fundamental to this assessment is the calculation of the predicted environmental concentration (PEC), which is dependent on the type of drug, its associated treatment characteristics, and the route by which residues enter the environment. Deterministic models for the calculation of the PEC have previously been presented. In this article, the inclusion of variability and uncertainty within such models is introduced. In particular, models for the calculation of the PEC for residues excreted directly onto pasture by grazing animals are considered and comparison of deterministic and stochastic results suggest that uncertainty and variability cannot be ignored.
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