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Relationships of Metals in Floor Dust and on the Hands of Toddlers

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Abstract:Toddlers are characterized by their frequent hand-to-mouth activity and exploratory behavior. This puts them at risk for exposure to environmental contaminants. Wipe samples are traditionally used to collect dust samples in homes. The assumption is that dust samples are indicative of what the child contacts and that loadings on children's hands should be similar to those found in the child's environment. As part of the Children's Dietary Lead Study hand wipes were obtrained from 45 toddlers; floor wipes were collected at the same time, with the same sampling medium. Analysis of wipe samples was conducted by ICP-MS for aluminum, arsenic, barium, cadmium, chromium, copper, lead, manganese, nickel, vanadium and zinc. No detectable chromium was found in any wipe sample. Aluminum and lead were found in all floor and hand wipe samples. Lead loadings (ng/cm2) on floor and hand wipes were correlated and were not significantly different in amount. In contrast, aluminum loadings on hands were not correlated with loadings from floor wipes and were significantly greater in amount. Median loadings were 413 and 71 ng/cm2 respectively. For many of the metals the propoRtion of samples with detectable levels was similar for hand wipes and floor wipes. However, arsenic and vanadium were found in more than 80% of hand wipe samples, yet less than 50% of floor wipe samples. For most of the metals, hand loadings were significantly greater than floor loadings. Two factors that may contribute to these differences are the multiple sources of exposure that the child experiences and differential particle size distributions that adhere to hands and are found on floors. The results suggest that for many metals hand loadings may exceed loadings found in environmental samples, and therefore are better indicators of exposure.
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Citation:Freeman, N. G., E. D. Pellizzari, L. J. Melnyk, and M. R. Berry Jr. Relationships of Metals in Floor Dust and on the Hands of Toddlers. Presented at ISEA Annual Conference, Monterey, CA, October 24-27, 2000.
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Contact: Mary P. O'Bryant - (919)-541-4871 or obriant.mary@epa.gov
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Division: Microbiological & Chemical Exposure Assessment Division
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Branch: Chemical Exposure Research Branch
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Product Type: Abstrct/Oral
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Presented: 10/27/2000
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Related Entries:
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Bullet Item Dietary Intake of Young Children
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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