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THE SPATIAL AND TEMPORAL DISTRIBUTION OF CHLORPYRIFOS IN THE U.S. EPA INDOOR AIR QUALITY (IAQ) TEST HOUSE FOLLOWING CRACK AND CREVICE TYPE APPLICATIONS
Citation:
Stout II, D M., M A. Mason, AND D A. Vallero. THE SPATIAL AND TEMPORAL DISTRIBUTION OF CHLORPYRIFOS IN THE U.S. EPA INDOOR AIR QUALITY (IAQ) TEST HOUSE FOLLOWING CRACK AND CREVICE TYPE APPLICATIONS. Presented at International Conference of Pesticide Exposure and Health Society for Occupational and Environmental Health, Bethesda, MA, December 17-21, 2001.
Impact/Purpose:
1. To identify those pesticides, pathways, and activities that represent the highest potential exposures to children;
2. To determine the factors that influence pesticide exposures to children;
3. To develop methods for measuring multimedia exposures to children, including methods that account for important activities that take place in home, school, and day care settings;
4. To generate data on multimedia pesticide concentrations, pesticide biomarkers, and exposure factors that can be used as inputs to aggregate exposure models for children.
Description:
Pesticides found in homes may result from indoor applications to control household pests or by translocation from outdoor sources. Pesticides disperse according to their physical properties and other factors such as human activity, air exchange, temperature and humidity. Insecticide treatments to the cracks and crevices within residential dwellings is the most common technique used to control insect pests. A study was conducted in the U.S. EPA IAQ test house to explore the spatial and temporal distribution of chlorpyrifos following a crack and crevice application. A 0.5% chlorpyrifos formulation was applied to the kitchen by a licenced pest control operator. Following the application, measurements were made in the kitchen, den and master bedroom over a 21-day period. Airborne concentrations were collected using both polyurethane foam (PUF) and a XAD/PUF media. Transferable residues were determined using a press sampler and EMPORE TM (C18) extraction discs. Spatial distributions, application surface loadings, and redeposition were measured using 10 cm2 deposition coupons. Square sections were cut from existing carpet to determine the total extractable residues. Surface wipes were collected from formica surfaces in the kitchen. Vacuum dislodgeable residues were collected from the den. Results will provide quantitative data to clarify the physical and chemical behavior of chlorpyrifos following indoor crack and crevice applications and the potential for human exposures.
This work has been funded wholly or in part by the United States Environmental Protection Agency. It has been subjected to Agency review and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.