Volatilization of Parathion and Chlorothalonil from a Potato Crop Simulated by the PEARL Model

M. Leistra, F. van den Berg

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)2243-2248
JournalEnvironmental Science and Technology
Issue number7
Publication statusPublished - 2007


  • measuring pesticide evaporation
  • fungicide fenpropimorph
  • temporal dynamics
  • degradation
  • residues
  • greenhouses
  • foliage
  • soil

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