Sedimentary records of contaminant inputs in Frobisher Bay, Nunavut.

Autor:	Bartley MC; Centre for Earth Observation Science, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.; Department of Environment and Geography, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada., Tremblay T; Canada-Nunavut Geoscience Office, Iqaluit, Nunavut, X0A 0H0, Canada., De Silva AO; Environment and Climate Change Canada, Burlington, Ontario, L7S 1A1, Canada., Michelle Kamula C; Centre for Earth Observation Science, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada., Ciastek S; Centre for Earth Observation Science, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada., Kuzyk ZZA; Centre for Earth Observation Science, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.; Department of Environment and Geography, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.; Department of Earth Sciences, Clayton H. Riddell Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada.
Jazyk:	angličtina
Zdroj:	Environmental science and ecotechnology [Environ Sci Ecotechnol] 2023 Sep 19; Vol. 18, pp. 100313. Date of Electronic Publication: 2023 Sep 19 (Print Publication: 2024).
DOI:	10.1016/j.ese.2023.100313
Abstrakt:	Contaminants, such as polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), heavy metals, and per and polyfluoroalkyl substances (PFASs), primarily reach the Arctic through long-range atmospheric and oceanic transport. However, local sources within the Arctic also contribute to the levels observed in the environment, including legacy sources and new sources that arise from activities associated with increasing commercial and industrial development. The City of Iqaluit in Frobisher Bay, Nunavut (Canada), has seen rapid population growth and associated development during recent decades yet remains a site of interest for ocean protection, where Inuit continue to harvest country food. In the present study, seven dated marine sediment cores collected in Koojesse Inlet near Iqaluit, and from sites in inner and outer Frobisher Bay, respectively, were analyzed for total mercury (THg), major and trace elements, PAHs, PCBs, and PFASs. The sedimentary record in Koojesse Inlet shows a period of Aroclor 1260-like PCB input concurrent with military site presence in the 1950-60s, followed by decades of input of pyrogenic PAHs, averaging about ten times background levels. Near-surface sediments in Koojesse Inlet also show evidence of transient local-source inputs of THg and PFASs, and recycling or continued slow release of PCBs from legacy land-based sources. Differences in PFAS congener composition clearly distinguish the local sources from long-range transport. Outside Koojesse Inlet but still in inner Frobisher Bay, 9.2 km from Iqaluit, sediments showed evidence of both local source (PCB) and long-range transport. In outer Frobisher Bay, an up-core increase in THg and PFASs in sediments may be explained by ongoing inputs of these contaminants from long-range transport. The context for ocean protection and country food harvesting in this region of the Arctic clearly involves both local sources and long-range transport, with past human activities leaving a long legacy insofar as levels of persistent organic pollutants are concerned. Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (© 2023 The Authors.)
Databáze:	MEDLINE
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