Abstract
We collected indoor air, surface wipes (floors, table tops, and window sills), and floor dust samples at multiple locations within 11 occupied and two unoccupied homes both before and after lawn application of the herbicide 2,4-D. We measured residues 1 week before and after application. We used collected samples to determine transport routes of 2,4-D from the lawn into the homes, its subsequent distribution between the indoor surfaces, and air concentration as a function of airborne particle size. We used residue measurements to estimate potential exposures within these homes. After lawn application, 2,4-D was detected in indoor air and on all surfaces throughout all homes. Track-in by an active dog and by the homeowner applicator were the most significant factors for intrusion. Resuspension of floor dust was the major source of 2,4-D in indoor air, with highest levels of 2,4-D found in the particle size range of 2.5-10 microm. Resuspended floor dust was also a major source of 2,4-D on tables and window sills. Estimated postapplication indoor exposure levels for young children from nondietary ingestion may be 1-10 microg/day from contact with floors, and 0.2-30 microg/day from contact with table tops. These are estimated to be about 10 times higher than the preapplication exposures. By comparison, dietary ingestion of 2,4-D is approximately 1.3 microg/day.
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Selected References
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- Cohen Hubal E. A., Sheldon L. S., Burke J. M., McCurdy T. R., Berry M. R., Rigas M. L., Zartarian V. G., Freeman N. C. Children's exposure assessment: a review of factors influencing Children's exposure, and the data available to characterize and assess that exposure. Environ Health Perspect. 2000 Jun;108(6):475–486. doi: 10.1289/ehp.108-1638158. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kissel J. C., Shirai J. H., Richter K. Y., Fenske R. A. Empirical investigation of hand-to-mouth transfer of soil. Bull Environ Contam Toxicol. 1998 Mar;60(3):379–386. doi: 10.1007/s001289900637. [DOI] [PubMed] [Google Scholar]
- Reed K. J., Jimenez M., Freeman N. C., Lioy P. J. Quantification of children's hand and mouthing activities through a videotaping methodology. J Expo Anal Environ Epidemiol. 1999 Sep-Oct;9(5):513–520. doi: 10.1038/sj.jea.7500047. [DOI] [PubMed] [Google Scholar]
- Simcox N. J., Fenske R. A., Wolz S. A., Lee I. C., Kalman D. A. Pesticides in household dust and soil: exposure pathways for children of agricultural families. Environ Health Perspect. 1995 Dec;103(12):1126–1134. doi: 10.1289/ehp.951031126. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Zartarian V. G., Ozkaynak H., Burke J. M., Zufall M. J., Rigas M. L., Furtaw E. J., Jr A modeling framework for estimating children's residential exposure and dose to chlorpyrifos via dermal residue contact and nondietary ingestion. Environ Health Perspect. 2000 Jun;108(6):505–514. doi: 10.1289/ehp.00108505. [DOI] [PMC free article] [PubMed] [Google Scholar]