US EPA

723765 

Journal Article 

An assessment of the exposure of Americans to perfluorooctane sulfonate: A comparison of estimated intake with values inferred from NHANES data 

Egeghy, PP; Lorber, M 

2011 

1 

Journal of Exposure Science & Environmental Epidemiology
ISSN: 1559-0631
EISSN: 1559-064X 

Nature Publishing Group 

21 

2 

150-168 

English 

20145679 

10.1038/jes.2009.73 

WOS:000288054700007 

https://www.proquest.com/docview/2640593283?accountid=171501&bdid=35852&_bd=VML%2F86JHhHYRL%2FT3GmqkEgN39is%3D
Exit
 

To better understand human exposure to perfluorinated compounds (PFCs), a model that assesses exposure to perfluorooctane sulfonate (PFOS) and its precursors from both an intake and a body burden perspective and combines the two with a simple pharmacokinetic (PK) model is demonstrated. Exposure pathways were modeled under "typical" and "contaminated" scenarios, for young children and adults. A range of intakes was also estimated from serum concentrations of PFOS reported in the National Health and Nutrition Examination Survey (NHANES) using a first-order 1-compartment PK model. Total PFOS intakes (medians summed over all pathways) were estimated as: 160 and 2200 ng/day for adults and 50 and 640 ng/day for children under typical and contaminated scenarios, respectively. Food ingestion appears to be the primary route of exposure in the general population. For children, the contribution from dust ingestion is nearly as great as from food ingestion. Pathway-specific contributions span several orders of magnitude and exhibit considerable overlap. PK modeling suggests central tendency PFOS intakes for adults range between 1.6 and 24.2 ng/kg-bw/day, and the forward-based intake estimates are within this range. The favorable comparison reported between the forward-modeled and the back-calculated range of intake predictions lends validity to the proposed framework. 

human exposure assessment; perfluorinated compounds; pharmacokinetic modeling