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THE DISTRIBUTION OF CHLORPYRIFOS FOLLOWING A CRACK AND CREVICE TYPE APPLICATION IN THE U.S. EPA INDOOR AIR QUALITY RESEARCH HOUSE
Citation:
Stout II, D M. AND M A. Mason*. THE DISTRIBUTION OF CHLORPYRIFOS FOLLOWING A CRACK AND CREVICE TYPE APPLICATION IN THE U.S. EPA INDOOR AIR QUALITY RESEARCH HOUSE. ATMOSPHERIC ENVIRONMENT. Elsevier Science BV, Amsterdam, Netherlands, 37(39/40):5539-5549.
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:
The paper gives results of a study to determine the spatial and temporal distribution of chlorpyrifos following a professional crack-and-crevice application in the kitchen of the U.S. EPA's indoor air quality research house in North Carolina. Following the application, measurements were made in the kitchen, den, and master bed- room over 21 days. Airborne concentrations were collected using both polyurethane foam (PUF) and a XAD/PUF OSHA versatile sampler (OVS). Measured airborne concentrations were similar for the two samplers, were higher in the three rooms following the application, reached maximal levels 24 h post-application, and declined steadily over the 21-day study. Spatial and temporal distributions were measured using 10-sq cm cotton deposition coupons. Sections were cut from existing carpeting to determine the total extractable residues. Chlorpyrifos was measured from all matrixes in the kitchen, den, and master bedroom and shows the transport of airborne residues from the point of application to remote locations in the house.
