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Fugacity-Based Indoor Residential Pesticide Fate Model

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Abstract:Dermal and non-dietary pathways are possibly important for exposure to pesticides used in residences. Limited data have been collected on pesticide concentrations in residential air and surfaces following application. Models may be useful for interpreting these data and to make predictions about concentrations in the home for other pesticides based on chemical properties. We present a dynamic mass-balance compartment model based on fugacity principles. The model includes air (both gas phase and aerosols), carpet, smooth flooring, and walls as model compartments. Six size fractions of particulate matter with different fate and transport properties are included. We determine the compartmental fugacity capacity and mass-transfer rate coefficients between compartments. We compare model results to chlorpyrifos air and carpet measurements from an independent study. For a comparison, we run the same simulation for diazinon and permethrin. We quantify the effect of parameter uncertainty and model uncertainties related to the source release rate and conduct a sensitivity analysis to determine which parameters contribute most to output uncertainty. In the model comparison to chlorpyrifos measurements, the model results are of the same order of magnitude as measured values, but tend to overpredict the measured data, thus indicating the need for a better understanding of emissions from treated surfaces.

The United States Environmental Protection Agency through its Office of Research and Development partially funded and collaborated in the research descrived here under assistance agreement number DW-988-38190-01-0 to Lawrence Berkeley National Laboratory. It has been subjected to Agency review and approved for publication.
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Citation:Bennett, D. H., and E. J. Furtaw Jr. Fugacity-Based Indoor Residential Pesticide Fate Model. ENVIRONMENTAL SCIENCE AND TECHNOLOGY 38(7):2142-2152, (2004).
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Exposure & Dose Research Branch
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Product Type: Journal
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Published: 02/28/2004
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Bullet Item Fugacity-Based Indoor Residential Pesticide Fate Model
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Related Entries:
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Bullet Item Models and Modeling Methods for Assessing Human Exposure and Dose to Toxic Chemicals and Pollutants
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