Concentrations of pesticides in the environment are driven by a large number of processes related to the use-pattern and use-environment.  Measurement of residues of pesticides in environmental matrices is resource-and time-intensive and models offer an attractive alternative for estimating exposures to organisms via environmental matrices.  Measurements are often regarded as the gold-standard, but to properly characterize temporal variation, they need to be based on frequent sampling.  This presentation will examine modeling and measurement of residues of pesticides in relation to the comparison of these to toxicity data in risk assessment where matching of temporal information is required.  Changes in use-pattern modify amounts and frequency of input of pesticides into the receiving environment.  Validation of the effects of these changes and other mitigation measures are important feedback for tracking the appropriateness of regulations.  This paper will illustrate these and other related issues by examples from recent environmental risk assessments of pesticides.

Modelling concentrations of pesticides in the environment: How far to the gold standard?

248th National Meeting (2014)

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