2024-01-10 ロードアイランド大学(URI)
◆PFASは、ポップコーン袋やカーペット、空港や軍事基地の消防設備などに使用される化学物質で、「永遠の化学物質」と呼ばれます。アークティックオーシャンがこれらの化合物を北大西洋オーシャンに輸送することが示唆され、その循環量は年間で約123トンがアークティックに流入し、約110トンが大西洋に流入していることが報告されました。
＜関連情報＞
- https://www.uri.edu/news/2024/01/forever-chemicals-are-flowing-between-the-arctic-and-atlantic-oceans-study-finds/
- https://pubs.acs.org/doi/10.1021/acs.estlett.3c00835
パッシブ・サンプラーによる北大西洋フラム海峡を横断するパーフルオロアルキル物質（PFASs）のプロファイルと質量流量の導出 Passive Sampler Derived Profiles and Mass Flows of Perfluorinated Alkyl Substances (PFASs) across the Fram Strait in the North Atlantic
Matthew Dunn, Simon Vojta, Thomas Soltwedel, Wilken-Jon von Appen, and Rainer Lohmann
Environmental Science & Technology Letters Published:January 10, 2024
DOI:https://doi.org/10.1021/acs.estlett.3c00835
Abstract
Per- and polyfluorinated alkyl substances (PFAS) are a family of pollutants of high concern due to their ubiquity and negative human health impacts. The long-range marine transport of PFAS was observed during year-long deployments of passive tube samplers in the Fram Strait across three depth transects. Time weighted average concentrations ranged from 2.4 to 360 pg L–1, and 10 different PFAS were regularly observed. PFAS profiles and concentrations were generally similar to those previously characterized for polycyclic aromatic hydrocarbons (PAHs) at these sites. The detection of several anionic PFAS in “old” water demonstrated that they are not perfect water mass tracers but are also transported to depth via settling particles. Mass flows of PFAS through the Fram Strait in and out of the Arctic Ocean were basically similar (112 ± 82 Mg year–1 northward flow, 100 ± 54 Mg year–1 southward flow). For perfluorooctane sulfonamide (FOSA), export from the Arctic Ocean via the Fram Strait exceeded import by Atlantic Water, likely due to preferential transport and deposition in the Arctic Ocean. These observations suggest that PFAS in the Arctic are governed by the feedback loop previously described for polycyclic aromatic hydrocarbons (PAHs) in the region─with additional atmospheric transport delivering volatile PFAS to the Arctic, which then get exported via Arctic water masses.
