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THE DISTRIBUTION OF CHLORPYRIFOS FOLLOWING A CRACK AND CREVICE TYPE APPLICAITON IN THE U.S. EPA INDOOR AIR QUALITY (IAQ) TEST HOUSE
Citation:
Stout II, D M. AND M A. Mason. THE DISTRIBUTION OF CHLORPYRIFOS FOLLOWING A CRACK AND CREVICE TYPE APPLICAITON IN THE U.S. EPA INDOOR AIR QUALITY (IAQ) TEST HOUSE. Presented at Indoor Air 2002 The 9th International Conference on Indoor Air Quality and Climate, Monterey, CA, June 30-July 5, 2002.
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, residential air exchange, temperature and humidity. A study was conducted in the U.S. EPA Indoor Air Quality test house to determine the spatial and temporal distribution of chlorpyrifos following a professional crack and crevice application in the kitchen. Following the application, measurements were made in the kitchen, den and master bedroom over 21-days. Airborne concentrations were collected using both polyurethane foam (PUF) and a XAD/PUF media. Transferable chlorpyrifos residues were determined using a press sampler and C18 extraction discs. Spatial distributions, application surface loadings, and redeposition were measured using 10 cm2 deposition coupons. Sections were cut from existing carpet to determine the total extractable residues. Surface wipes were and vacuum dislodgeable residues were collected in the kitchen and carpeted den, respectively. Measured airborne concentrations were similar for both samplers, detected in all rooms sampled, reached maximal concentrations 24-hours post-application and steadily declined by day 21. Concentrations measured from deposition coupons suggest that airborne residues sorbed to deposition coupons in all rooms sampled. However, carpet sections, due to high background concentrations of chlorpyrifos, poorly resolve the contribution of the application to carpet residues.
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.