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Modeling Global-Scale Fate and Transport of Perfluorooctanoate Emitted from Direct Sources
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2006 In: Environmental Science & Technology, ISSN 0013-936X, Vol. 40, no 22, 6969 - 6975 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2006. Vol. 40, no 22, 6969 - 6975 p.
Identifiers
URN: urn:nbn:se:su:diva-25782OAI: oai:DiVA.org:su-25782DiVA: diva2:200510
Note
Part of urn:nbn:se:su:diva-8571Available from: 2009-03-05 Created: 2009-02-19Bibliographically approved
In thesis
1. Modeling the global fate and transport of perfluoroalkylated substances (PFAS)
Open this publication in new window or tab >>Modeling the global fate and transport of perfluoroalkylated substances (PFAS)
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Perfluoroalkylated substances (PFAS) are persistent contaminants that are widely distributed in the global environment. Despite the fact that these chemicals have been manufactured and used for over 50 years, there has been little scientific and regulatory interest until very recently. An important research priority over the past decade has been to gain a better understanding of the mechanisms and pathways explaining the presence of these compounds in remote regions. One explanation is related to the use and release of volatile precursor compounds which undergo atmospheric transport and are also susceptible to degradation to PFAS through gas phase reactions with radical species. The main purpose of this doctoral thesis was to investigate an alternative explanation, namely the long-range transport (LRT) of PFAS themselves, which have been released into the environment in substantial quantities during manufacturing and product use. Papers I – III explore the LRT potential of perfluorocarboxylic acids and perfluorocarboxylates and demonstrate that both oceanic and atmospheric transport are efficient pathways of dispersion from source to remote regions of the Northern Hemisphere. Oceanic transport of perfluorooctane sulfonate (PFOS) was shown to be an important process in Paper IV as well. The role of precursor transport and degradation to PFOS was also examined in this paper. The most interesting aspect of the fate and transport of PFOS precursors is the rapid response in ambient concentrations exhibited by these compounds in the model simulations following production phase-out. Since precursor compounds are known to degrade to PFOS in vivo, the modeling results demonstrate that this exposure pathway is a plausible explanation for the declining trends in PFOS concentrations reported for marine mammals in some remote environments.

Place, publisher, year, edition, pages
Stockholm: Institutionen för tillämpad miljövetenskap (ITM), 2009. 32 p.
Keyword
perfluoroalkylated substances, global-scale, fate and transport
National Category
Environmental Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-8571 (URN)978-91-7155-812-1 (ISBN)
Public defence
2009-03-27, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00
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Supervisors
Available from: 2009-03-05 Created: 2009-02-19Bibliographically approved

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