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Evaluating Excess Dietary Exposure of Young Children Eating in Contaminated Environments

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Abstract: The United States' Food Quality Protection Act of 1996 requires more accurate assessment of children's aggregate exposures to environmental contaminants. Since children have unstructured eating behaviors, their excess exposures, caused by eating activities, becomes an important factor in determining dietary exposures of the most highly exposed children. A deterministic model was developed to more accurately estimate dietary intakes of a chemical contaminant by young children. The sum of three terms determine total intake: the original contaminant residue on food, surface-to-food contamination, and surface-to-hand-to-food contamination. Transfer of the contaminant from surfaces (including hands) to food and activity level of the child are the dominant factors for food consumed in highly-contaminated environments. Pesticide transfer from surfaces to foods has been measured to establish relationships between different pesticide classes, surface types, and contact duration. Transfer efficiencies from hardwood flooring surfaces were 30 to 57% of applied pesticide concentrations. The corresponding transfer efficiencies from carpet were much less. Transfer to foods was greater with both increased contact force and duration. Limited data are available for assessing factors associated with children's dietary activities. Videotaping allows frequencies and durations of hand and food contacts to be recorded and translated by a computerized software program. However, video analysis is labor intensive and new approaches to define children's activity patterns are being evaluated including accelerometers, handling of a standard food, and questionnaires. Research directed at developing measurement approaches to evaluate children's dietary exposures, including factors associated with additional contamination caused by surface contacts and eating activities, will be presented.
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Citation:Melnyk, L. J., C. E. Bernard, and M. R. Berry Jr. Evaluating Excess Dietary Exposure of Young Children Eating in Contaminated Environments. Presented at 5th European Pesticide Residue Workshop, Stockholm, Sweden, June 13-16, 2004.
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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: 06/13/2004
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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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