Temporal Trends of Hexabromocyclododecane, Polybrominated Diphenyl Ethers and Polychlorinated Biphenyls in Ringed Seals from East Greenland

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Concentrations of hexabromocyclododecane (HBCD) were determined in a combination of archived and fresh
blubber samples of juvenile ringed seals from East Greenland collected between 1986 and 2008. R-HBCD was the only
diastereoisomer consistently above levels of quantification and showed a significant log-linear (exponential) increase from 2.0
to 8.7 ng/g lipid weight (median concentrations) with an annual rate of þ6.1%. The concentrations were up to several orders of
magnitude lower than those reported for marine mammals from industrialized areas. Previously presented time trends on
polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) have been extended with new data for 2006 and
2008. ΣPBDE in juvenile seals was the only parameter with a slight upward trend, however, dependent on the low 1986
concentration. Removing this data point resulted in a downward trend, which also was found for adult seals with a time trend starting
in 1994. ΣPCB decreased significantly in juvenile seals, again due to the 1986 value, while no trend was found for the adult animals.
This indicates stagnating PCB concentrations at a relatively high level, in some cases possibly exceeding tolerable daily intake rates
for seal blubber as traditional Arctic food items.
Original languageEnglish
JournalEnvironmental Science & Technology (Washington)
Pages (from-to)1243-1249
Publication statusPublished - 2011

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