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An Indoor Pesticide Air and Surface Concentration Model

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Abstract: A thorough assessment of human exposure to environmental chemicals requires consideration of all processes in the sequence from source to dose. For assessment of exposure to pesticides following their use indoors, data and models are needed to estimate pesticide concentrations in air, and loadings (surface concentrations) on a variety of surfaces which humans contact. The objective of the current project is to develop such a model. This model will be used to assist in the assessment of inhalation, dermal, and non-dietary ingestion pathways, which are potentially significant for exposure to pesticides used in residences. A limited amount of data has been collected on pesticide concentrations in various residential compartments following an application. Models are needed to interpret these data and make predictions about other scenarios and other pesticides based on chemical properties. In this presentation, we describe a mass-balance compartmental model with several parameter values derived from fugacity principles. The model simulates pesticide air concentrations and surface loadings following the use of an indoor source, i.e. the application of a pesticide to partial surfaces, such as would occur in a crack-and-crevice application. We include air (both gas phase and aerosols), carpet, smooth flooring, and walls as model compartments. We estimate the compartmental fugacity capacities and mass-transfer rate coefficients for several types of materials commonly found in residences. We also describe the framework and equations for a multi-compartment dynamic mass-balance model, and show model outputs compared to measured pesticide air concentrations and surface loadings as functions of time following a pesticide application.

This is an abstract of a proposed presentation and does not necessarily reflect the United States Environmental Protection Agency (EPA) policy. The actual presentation has not been peer reviewed by EPA. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
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Citation:Furtaw Jr., E. J., D. H. Bennett, and T. E. Mckone. An Indoor Pesticide Air and Surface Concentration Model. Presented at 12th Conference of the International Society of Exposure Analysis, Vancouver, Canada, August 11-15, 2002.
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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: Human Expsoure Research Branch
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Product Type: Abstrct/Oral
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Presented: 08/11/2002
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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
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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