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Vertical Profiles, Sources, and Transport of PFASs in the Arctic Ocean
Örebro University, School of Science and Technology. Department of Chemistry, University of Toronto, Toronto ON, Canada. (MTM Research Centre)ORCID iD: 0000-0001-6800-5658
Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge MA, United States.
Department of Chemistry, University of Toronto, Toronto, ON, Canada.
Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge MA, United States.
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2017 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 51, no 12, 6735-6744 p.Article in journal (Refereed) Published
Abstract [en]

The relative importance of atmospheric versus oceanic transport for poly- and perfluorinated alkyl substances (PFASs) reaching the Arctic Ocean is not well understood. Vertical profiles from the Central Arctic Ocean and shelf water, snow and meltwater samples were collected in 2012; 13 PFASs (C6-C12 PFCAs; C6, 8, 10 PFSAs; MeFOSAA and EtFOSAA; and FOSA) were routinely detected (range: <5-343 pg/L). PFASs were only detectable above 150 m depth in the polar mixed layer (PML) and halocline. Enhanced concentrations were observed in snow and meltpond samples, implying atmospheric deposition as an important source of PFASs. Model results suggested atmospheric inputs to account for 34-59% (∼11-19 pg/L) of measured PFOA concentrations in the PML (mean 32 ± 15 pg/L). Modeled surface and halocline measurements for PFOS based on North Atlantic inflow (11-36 pg/L) agreed with measurements (mean, 17, range <5-41 pg/L). Modeled deep water concentrations below 200 m (5-15 pg/L) were slightly higher than measurements (<5 pg/L), suggesting the lower bound of PFAS emissions estimates from wastewater and rivers may provide the best estimate of inputs to the Arctic. Despite low concentrations in deep water, this reservoir is expected to contain most of the PFOS mass in the Arctic (63-180 Mg) and is projected to continue increasing to 2038.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 51, no 12, 6735-6744 p.
National Category
Environmental Sciences
Research subject
Enviromental Science
Identifiers
URN: urn:nbn:se:oru:diva-59038DOI: 10.1021/acs.est.7b00788ISI: 000404087400013PubMedID: 28513149Scopus ID: 2-s2.0-85021689113OAI: oai:DiVA.org:oru-59038DiVA: diva2:1129332
Note

Funding Agencies:

NSF's Office of Polar Programs  ARC 1203486  1203496 

Canada Foundation for Innovation: Advanced Laboratory for Fluorinated and Other New Substances in the Environment (ALFONSE) 

Available from: 2017-08-02 Created: 2017-08-02 Last updated: 2017-08-02Bibliographically approved

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