Neutral Poly/Per-Fluoroalkyl Substances in Air from the Atlantic to the Southern Ocean and in Antarctic Snow

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• 作者：Zhen Wang ; Zhiyong Xie ; Wenying Mi ; Axel M枚ller ; Hendrik Wolschke ; Ralf Ebinghaus
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：July 7, 2015
• 年：2015
• 卷：49
• 期：13
• 页码：7770-7775
• 全文大小：309K
• ISSN：1520-5851

文摘

The oceanic scale occurrences of typical neutral poly/per-fluoroalkyl substances (PFASs) in the atmosphere across the Atlantic, as well as their air-snow exchange at the Antarctic Peninsula, were investigated. Total concentrations of the 12 PFASs (鈭慞FASs) in gas phase ranged from 2.8 to 68.8 pg m^鈥? (mean: 23.5 pg m^鈥?), and the levels in snow were from 125 to 303 pg L^鈥? (mean: 209 pg L^鈥?). Fluorotelomer alcohols (FTOHs) were dominant in both air and snow. The differences of specific compounds to 鈭慞FASs were not significant between air and snow. 鈭慞FASs were higher above the northern Atlantic compared to the southern Atlantic, and the levels above the southern Atlantic <30掳S was the lowest. High atmospheric PFAS levels around the Antarctic Peninsula were the results of a combination of air mass, weak elimination processes and air-snow exchange of PFASs. Higher ratios of 8:2 to 10:2 to 6:2 FTOH were observed in the southern hemisphere, especially around the Antarctic Peninsula, suggesting that PFASs in the region were mainly from the long-range atmospheric transport. No obvious decrease of PFASs was observed in the background marine atmosphere after 2005.