报告题目：Long TermTemporal Trends of PFAS in Polar Regions: Influence of Continuing GlobalSources and Effects of Climate Change

报告人：Derek Muir，加拿大圭尔夫大学（University of Guelph）

报告时间：2025年11月26日15:00

报告地点：环境楼215会议室

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环境与能源学院

2025年11月21日

报告摘要：

Per- and polyfluoroalky substances (PFAS) werefirst detected in the Arctic in the early 2000s. The presence of elevatedconcentrations of PFOS and long chain (C9-C12 perfluorocarboxylates (PFCAs) inwildlife came as a surprise to environmental chemists because these substanceswere non-volatile and anionic. Since then monitoring programs in northernCanada, Greenland, Norway and Sweden have reported on the trends inconcentrations in both air and wildlife. In wildlife, especially polar bears,seals, and seabirds, C9-C12 PFCAs concentrations continue to climb, with somecompounds exceeding health-based thresholds and posing risks to ecosystems andIndigenous communities. While PFOS and PFCAs remain the major compounds beingdetected, an increasing array of PFAS have been reported in the Arctic. Amongthese is trifluoroacetic acid a breakdown of HFC refrigerants, which has beenshown to be increasing in Arctic glacier ice cores and in surface waters in thenorthern hemisphere. While primary emissions of volatile precursors to airappear to be the major sources of PFAS, releases from melting glaciers couldalso be important in some locations such as Arctic lakes and fjords. Thispresentation will review some of the recent findings and will also address thequestion of what other fluorinated substances in commerce may have Arcticaccumulation potential.

报告人简介：

Dr. Derek Muir is a ResearchScientist Emeritus with Environment & Climate Change Canada and holdsAdjunct Professor positions at the School of Environmental Sciences, Universityof Guelph, and in the Dept of Chemistry at University of Toronto as well as anHonorary Professor position with the Queensland Alliance of EnvironmentalHealth Sciences. In 2018-2019 he held the King Carl XVI Gustaf Professorship inEnvironmental Science at Stockholm University. His research has focused onpersistent and bioaccumulative contaminants with emphasis on identifying newchemicals of concern and assessing long-term trends in environmental media, aninterest that he shares with scientists at QAEHS. He was awarded the Society ofEnvironmental Toxicology and Chemistry (SETAC) Founder’s Award in 2000 for workon persistent organic pollutants. He is a SETAC Fellow and a Fellow of Canada’sNational Academy, the Royal Society of Canada. He is author or co-author ofover 700 peer reviewed papers, book chapters, and assessment reports.