Analysis of NHANES measured blood PCBs in the general US population and application of SHEDS model to identify key exposure factors

• Published in: Journal of exposure science & environmental epidemiology Vol. 24; no. 6; pp. 615 - 621
• Main Authors: Xue, Jianping, Liu, Shi V, Zartarian, Valerie G, Geller, Andrew M, Schultz, Bradley D
• Format: Journal Article
• Language: English
• Published: New York Nature Publishing Group US 01-11-2014; Nature Publishing Group
• Subjects: 692/700/2814; 692/700/478/174; 704/172/169/895; Adolescent; Adult; Age; Age Distribution; Age groups; Animal tissues; Biomarkers; Biomarkers - blood; Blood; Child; Contamination; Diet; Environmental health; Environmental Monitoring - methods; Environmental Pollutants - blood; Epidemiology; Ethnic Groups - statistics & numerical data; Ethnicity; Exposure; Female; Fish; Food Contamination - analysis; Gender; Humans; Identification and classification; Male; Medical research; Medicine; Medicine & Public Health; Medicine, Experimental; Middle Aged; Minority & ethnic groups; Models, Statistical; New York City; Nutrition; Nutrition Surveys; original-article; PCB; Polls & surveys; Polychlorinated biphenyls; Polychlorinated Biphenyls - blood; Seafood - adverse effects; Sex Distribution; Sheds; Stochasticity; United States; Young Adult; New York City; United States; United States > US; PCBs; exposure modeling; NHANES; biomonitoring; dietary exposure; SHEDS
• ISSN: 1559-0631; 1559-064X
• DOI: 10.1038/jes.2013.91

Studies have shown that the US population continues to be exposed to polychlorinated biphenyls (PCBs), despite their ban more than three decades ago, but the reasons are not fully understood. The objectives of this paper are to characterize patterns of PCBs in blood by age, gender, and ethnicity, and identify major exposure factors. EPA’s Stochastic Human Exposure and Dose Simulation (SHEDS)-dietary exposure model was applied, combining fish tissue PCB levels from a NYC Asian Market survey with National Health and Nutrition Examination Survey (NHANES) dietary consumption data, and then linked with blood biomarkers for the same NHANES study subjects. Results reveal that the mean concentration of total PCBs in blood was higher with increasing age; however, for the same age, gender, and ethnicity, the blood PCB concentrations measured in the later NHANES survey were significantly lower than those in the earlier one. The decrease within an age group between the two survey periods lessened with increasing age. Blood PCBs among different ethnicities ranked differently between the older and the younger age groups within each survey. Non-Hispanic Blacks had significantly higher blood PCBs for the >30 year age group. For the 12 to ≤30 year age group, the “Asian, Pacific Islander, Native American or multiracial” group had the highest values, with patterns fairly consistent with fish consumption and modeled PCB exposure patterns. We conclude that for younger people, patterns correspond to reduced environmental contamination over time, and are strongly associated with fish consumption and dietary exposures. Higher PCB concentrations in blood of the older population may partially reflect past exposures to higher environmental PCB concentrations, particularly before the ban.