Temporal trends of persistent organic pollutants in Arctic marine and freshwater biota

More than 1000 time-series of persistent organic pollutants (POPs) in Arctic biota from marine and freshwater ecosystems some extending back to the beginning of 1980s were analyzed using a robust statistical method. The Arctic area encompassed extended from Alaska, USA in the west to northern Scandi...

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Bibliographic Details
Published in:Science of The Total Environment
Main Authors: Riget, Frank, Bignert, Anders, Braune, Birgit, Dam, Maria, Dietz, Rune, Evans, Marlene, Green, Norman, Gunnlaugsdottir, Helga, Hoydal, Katrin S., Kucklick, John, Letcher, Robert, Muir, Derek, Schuur, Stacy, Sonne, Christian, Stern, Gary, Tomy, Gregg, Vorkamp, Katrin, Wilson, Simon
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Environmental monitoring
POPs
Temporal trends
Arctic
Biota
POLYBROMINATED DIPHENYL ETHERS
FLAME RETARDANTS
RINGED SEALS
ORGANOCHLORINE PESTICIDES
CHLORDANE COMPONENTS
TECHNICAL CHLORDANE
CLIMATE VARIABILITY
NORTHWATER POLYNYA
TRANS-NONACHLOR
POLAR BEARS
Alaska
Online Access:https://pure.au.dk/portal/da/publications/temporal-trends-of-persistent-organic-pollutants-in-arctic-marine-and-freshwater-biota(76a7693e-29e7-45ab-86e9-108f5066da0e).html
https://doi.org/10.1016/j.scitotenv.2018.08.268
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Summary:More than 1000 time-series of persistent organic pollutants (POPs) in Arctic biota from marine and freshwater ecosystems some extending back to the beginning of 1980s were analyzed using a robust statistical method. The Arctic area encompassed extended from Alaska, USA in the west to northern Scandinavian in the cast, with data gaps for Arctic Russia and Arctic Finland. The aim was to investigate whether temporal trends for different animal groups and matrices were consistent across a larger geographical area. In general, legacy POPs showed decreasing concentrations over the last two to three decades, which were most pronounced for aHCH and least pronounced for HCB and p-HCH. Few lime-series of legacy POPs showed increasing trends and only at sites suspected to be influenced by local source. The brominated flame retardant congener BDE-47 showed a typical trend of increasing concentration up to approximately the mid-2000s followed by a decreasing concentration. A similar trend was found for perfluorooctane sulfonic add (PFOS). These trends are likely related to the relatively recent introduction of national and international controls of hexa- and hepta-BDE congeners and the voluntary phase-out of PFOS production in the USA in 2000. Hexabromocyclododecane (HBCDD) was the only compound in this study showing a consistent increasing trend. Only 12% of the long-term time-series were able to detect a 5% annual change with a statistical power of 80% at alpha <0.05. The remaining 88% of time-series need additional years of data collection before fulfilling these statistical requirements. In the case of the organochlorine long-term time-series, 45% of these would require >20 years monitoring before this requirement would be fulfilled. (C) 2018 Elsevier B.V. All tights reserved.

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