NHEXAS PHASE I MARYLAND STUDY--PESTICIDES IN FOOD ANALYTICAL RESULTS

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Abstract

The Pesticides in Duplicate Diet Food data set contains analytical results for measurements of up to 10 pesticides in 682 food samples over 80 households. Each sample was collected as a duplicate of the food consumed by the primary respondent during a four-day period commencing with the beginning of Day #3, if convenient. Food samples were separated into solid food portions and beverages, which were analyzed separately. A single composite sample was analyzed for the four-day duplicate diet. Collections were made by the primary respondent in the household. The primary pesticides of interest included a-chlordane (CAS #5103-71-9 ), g-chlordane (CAS #12789-03-6), chlorpyrifos (CAS #2921-88-2), 4,4'-DDD (CAS #72-54-8), 4,4'-DDE (CAS #72-55-9), 4,4'-DDT (CAS #789-02-6), dieldrin (CAS #60-57-1), heptachlor (CAS #76-44-8), and malathion (CAS #121-75-5). Keywords: food; pesticides.

The National Human Exposure Assessment Survey (NHEXAS) is a federal interagency research effort coordinated by the Environmental Protection Agency (EPA), Office of Research and Development (ORD). Phase I consists of demonstration/scoping studies using probability-based sampling designs. The studies collected household environmental and personal samples for chemical analysis, and questionnaires were administered. The NHEXAS Phase I Questionnaires were organized into six modules for simplicity in administration (to minimize respondent burden and maximize participation rates at each step) and for collecting information that can be temporally related to the exposure, concentration, and/or biological measurements collected in NHEXAS: Descriptive, Baseline, Technician, Follow-up, Time and activity diary, and Dietary diary (and follow-up). The NHEXAS-Maryland study sampled residences determined by a proportion-based sample of Baltimore and four adjacent counties and measured metals, pesticides, and polynuclear aromatic hydrocarbons (PAHs). The study was conducted by Harvard University, Emory University, Johns Hopkins University, and Westat. Data collection occurred up to six times over one year for the participating households. Analytical results were obtained under strict QA/QC requirements during collection, processing, and final deposition into databases.

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