||Transport of lawn-applied 2,4-D from turf to home : assessing the relative importance of transport mechanisms and exposure pathways /
Nishioka, M. G. ;
Burkholder, H. M. ;
Brinkman, M. C. ;
||Battelle Memorial Inst., Columbus, OH.;Environmental Protection Agency, Research Triangle Park, NC. National Exposure Research Lab.
|| U.S. Environmental Protection Agency, National Exposure Research Laboratory,
Indoor air pollution--United States ;
2-4-dichlorophenoxyacetic acid ;
Pesticide residues ;
Environmental transport ;
Environmental exposure pathway ;
Indoor air pollution ;
Particle size ;
Pesticide drift ;
Foliar application ;
Polyurethane foam ;
||Some EPA libraries have a fiche copy filed under the call number shown.
||142 pages : illustrations, tables ; 28 cm
Methods have been developed to estimate children's residential exposures to pesticide residues and applied in a small field study of indoor exposures resulting from the intrusion of lawn-applied herbicide into the home. Transport of 2,4-D from the residential lawn into the home was measured following both homeowner and commercial application of this herbicide. Sampling methods included particle size-selective indoor air sampling; wipe sampling of floors, sills, tables; the polyurethane foam (PUF) roller for dislodgeable carpet surface residues; and the HVS3 vacuum sampler for floor dust. Personal exposure samples included hand wipes and morning void urine samples. Pesticide spray drift was found to result in only a relatively minor increase in indoor pesticide levels. Post-application air intrusion from closed house ventilation and the opening and closing of doors and windows increased indoor background levels 6-fold, while track-in by high activity children and pets, and wearing shoes indoors, increasing indoor levels by 37-fold. Indoor 2,4-D levels were found to increase continually over a one-week period, with the increase in indoor air levels corresponding to the increased floor dust levels, suggesting resuspension of house dust by human activity. Similar estimates of non-dietary exposure are obtained from models based on 100 mg dust by human activity. Similar estimates of non-dietary exposure are obtained from models based on 100 mg dust ingestion and surface contact simulated by the PUF roller.
Prepared by Marcia G. Nishioka, et al ... /Battelle. Prepared for U.S. EPA National Exposure Research Laboratory. "Cooperative Agreement CR-822082." "March 1999." Includes bibliographical references. Microfiche.