Journal
JOURNAL OF EXPOSURE ANALYSIS AND ENVIRONMENTAL EPIDEMIOLOGY
Volume 12, Issue 1, Pages 44-53Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.jea.7500201
Keywords
agent orange; dioxin; pharmacokinetics; TCDD
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A combined analysis of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) elimination in Seveso adults and Ranch Hand veterans found a period of fast elimination within the first 0.27 years after exposure in Seveso, followed by a period of slower elimination between 3 and 16.35 years from exposure. The mean TCDD elimination rate within the first 0.27 years after exposure among six adult males in the Seveso cohort was 2.0646 year(-1) (half-life =0.34 years). The mean rate from 3 to 16.35 years was 0.1011 year(-1) (half-life =6.9 years). The mean Ranch Hand elimination rate, 00924 year-1 (half-life =6.9 years), measured between 9 and 33 years after exposure, was significantly less than the Seveso mean in the first 0.27 years after exposure, but not significantly different from the Seveso mean between 3 and 16.35 years after exposure. The fast elimination within the first 0.27 years followed by a slower rate after 3 years is consistent with the expected pattern in a two-compartment open model, with a distribution phase of rapid elimination followed by a slower elimination phase.
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