1. Volatilization of Parathion and Chiorothalonil from a Potato Crop Simulated by the PEARL Model.
- Author
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Leistra, Minze and Van Den Berg, Frederik
- Subjects
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PESTICIDE pollution , *AGRICULTURAL chemicals , *ENVIRONMENTAL quality , *ENVIRONMENTAL policy , *ENVIRONMENTAL law , *ENVIRONMENTAL protection , *POLLUTION , *AIR pollution , *AIR quality , *POISONS - Abstract
The volatilization of pesticides from crop canopies in the field should be modeled within the context of evaluating environmental exposure. A model concept based on diffusion through a laminar air-boundary layer was incorporated into the PEARL model (pesticide emission assessment at regional and local scales) and used to simulate volatilization of the pesticides parathion and chlorothalonil from a potato crop in a field experiment. Rate coefficients for the competing processes of plant penetration, wash off, and phototransformation in the canopy had to be derived from a diversity of literature data. Cumulative volatilization of the moderately volatile parathion (31% of the dosage in 7.6 days) could be simulated after calibrating two input data derived for the related compound parathion-methyl. The less volatile and more slowly transformed chlorothalonil showed 5% volatilization in 7.6 days, which could be explained by the simulation. Simulated behavior of the pesticides in the crop canopy roughly corresponded to published data. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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