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(P380) Conceptual Models for Aquatic Risk Assessment of Pesticide Runoff and Spray Drift.
Giddings, Jeffrey*,1, Hendley, Paul2, Hosmer, Alan2, Dobbs, Michael3, 1 The Cadmus Group, Marion, MA, USA2 Syngenta Crop Protection, Greensboro, NC3 Aventis Crop Protection, Research Triangle Park, NC
ABSTRACT- Generic conceptual models are presented for aquatic risk assessment of pesticide runoff and spray drift. The conceptual models describe the qualitative relationships between pesticide application, environmental transport pathways, patterns of exposure, and ecological effects. They identify factors that determine exposure and responses of populations and communities inhabiting aquatic ecosystems adjacent to treated fields, including physical and chemical properties of the pesticide, application practices, characteristics of the treated field, weather, characteristics of the receiving water, characteristics of the biological receptors, and ecological processes. Each of these groups of factors includes several specific components. During the problem formulation stage of the risk assessment, sources of uncertainty and variability associated with each component are identified, and decisions are made as to how these uncertainties and variabilities will be addressed. Examples illustrate how the conceptual models can be used to refine a risk assessment using uncertainty analysis and probabilistic methods.
Key words: probabilistic risk assessment, pesticides, conceptual model, aquatic
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