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首页> 外文期刊>Environmental Science & Technology >Semivolatile Fluoridated Organic Compounds in Asian and Western U.S. Air Masses
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Semivolatile Fluoridated Organic Compounds in Asian and Western U.S. Air Masses

机译：亚洲和美国西部空气中的半挥发性氟化有机化合物

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Semivolatile fluorinated organic compounds (FOCs) were measured in archived air sample extracts collected from Hedo Station Observatory (HSO) on Okinawa, Japan and Mount Bachelor Observatory (MBO), Oregon U.S. during the springs of 2004 (MBO and HSO) and 2006 (MBO). Fluorotelomer alcohols (FTOHs) were measured in both Asian and western U.S. air masses, though western U.S. air masses had significantly higher concentrations. Concentrations of fluorotelomer olefins in Asian air masses and 8:2 fluorotelomer acrylate in U.S. air masses were reported for the first time. N-ethyl perfluorooctane sulfonamide, N-methyl perfluorooctane sulfonamido ethanol, and N-ethyl perfluorooctane sulfonamido ethanol were also measured in Asian and western U.S. air masses but less frequently than FTOHs. The atmospheric sources and fate of FTOHs were investigated by estimating their atmospheric residence times, calculating FTOH concentration ratios, investigating FTOH correlations with nonfluorinated semivolatile organic compound concentrations, and determining air mass back trajectories. Estimated atmospheric residence times for 6:2 FTOH, 8:2 FTOH, and 10:2 FOH were 50, 80, and 70 d, respectively, and the average concentration ratio of 6:2 FTOH to 8:2 FTOH to 10:2 FTOH at MBO in 2006 was 1.0 to 5.0 to 2.5. The relative order of these atmospheric residence times may explain the observed enhancement of 8:2 FTOH and 10:2 FTOH (relative to 6:2 FOH) at MBO compared to North American indoor air (FTOH average ratio of 1.0 to 2.0 to 1.0). FOH concentrations in western U.S. air masses were positively correlated (p < 0.05) with gas-phase polycyclic aromatic hydrocarbon and polychlorinated biphenyl concentrations and negatively correlated (p < 0.05) with agricultural pesticide concentrations. In comparison to western U.S. air masses, trans-Pacific air masses did not contain elevated concentrations of these compounds, whereas lower boundary layer air masses that passed over urban areas of the western U.S. did. This suggests that semivolatile FOCs are emitted from urban areas in the western U.S.
机译：在2004年春季（MBO和HSO）和2006年春季（MBO）中，从日本冲绳的Hedo站天文台（HSO）和美国俄勒冈州的Mount Bachelor天文台（MBO）收集的存档空气样品提取物中测量了半挥发性氟化有机化合物（FOC）。 ）。尽管在美国西部的空气质量浓度明显较高，但在亚洲和美国西部的空气质量中都测量了氟代端基醇（FTOH）。首次报道了亚洲空气质量中的氟调聚物烯烃的浓度和美国空气质量中的8：2氟调聚物丙烯酸酯的浓度。 N-乙基全氟辛烷磺酰胺基乙醇和N-乙基全氟辛烷磺酰胺基乙醇在美国和亚洲的西部空气质量中也进行了测量，但其频率低于FTOH。通过估算FTOH的大气停留时间，计算FTOH浓度比，调查FTOH与非氟化半挥发性有机化合物浓度之间的关系以及确定空气质量的反向轨迹，来研究FTOH的大气来源和结局。 6：2 FTOH，8：2 FTOH和10：2 FOH的估计大气停留时间分别为50、80和70 d，平均浓度比为6：2 FTOH与8：2 FTOH与10：2 2006年MBO的FTOH为1.0至5.0至2.5。这些大气停留时间的相对顺序可以解释与北美室内空气相比，在MBO处观察到的8：2 FTOH和10：2 FTOH（相对于6：2 FOH）的增强（FTOH平均比率为1.0到2.0到1.0） 。美国西部空气质量中的FOH浓度与气相多环芳烃和多氯联苯浓度呈正相关（p <0.05），与农业农药浓度呈负相关（p <0.05）。与美国西部的空气质量相比，跨太平洋的空气质量并未包含这些化合物的升高浓度，而越过美国西部的城市区域的较低边界层空气质量却包含了这些化合物。这表明半挥发性FOC是从美国西部的城市地区排放的。

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