北极空气和雪中的中性多/全氟烷基物质。
Neutral poly-/perfluoroalkyl substances in air and snow from the Arctic.
作者信息
Xie Zhiyong, Wang Zhen, Mi Wenying, Möller Axel, Wolschke Hendrik, Ebinghaus Ralf
机构信息
Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Department for Environmental Chemistry, Geesthacht, 21502, Germany.
1] Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Department for Environmental Chemistry, Geesthacht, 21502, Germany [2] National Marine Environmental Monitoring Center, Dalian 116023, China.
出版信息
Sci Rep. 2015 Mar 9;5:8912. doi: 10.1038/srep08912.
Levels of neutral poly-/perfluoroalkyl substances (nPFASs) in air and snow collected from Ny-Ålesund were measured and their air-snow exchange was determined to investigate whether they could re-volatilize into the atmosphere driven by means of air-snow exchange. The total concentration of 12 neutral PFASs ranged from 6.7 to 39 pg m(-3) in air and from 330 to 690 pg L(-1) in snow. A significant log-linear relationship was observed between the gas/particle partition coefficient and vapor pressure of the neutral PFASs. For fluorotelomer alcohol (FTOHs) and fluorotelomer acrylates (FTAs), the air-snow exchange fluxes were positive, indicating net evaporative from snow into air, while net deposition into snow was observed for perfluorooctane sulfonamidoethanols (Me/EtFOSEs) in winter and spring of 2012. The air-snow exchange was snow-phase controlled for FTOHs and FTAs, and controlled by the air-phase for FOSEs. Air-snow exchange may significantly interfere with atmospheric concentrations of neutral PFASs in the Arctic.
对从新奥尔松采集的空气和雪中的中性多/全氟烷基物质（nPFASs）水平进行了测量，并确定了它们在空气与雪之间的交换情况，以研究这些物质是否会通过空气-雪交换作用重新挥发到大气中。12种中性PFASs的总浓度在空气中为6.7至39 pg m⁻³，在雪中为330至690 pg L⁻¹。观察到中性PFASs的气/粒分配系数与蒸气压之间存在显著的对数线性关系。对于氟调聚物醇（FTOHs）和氟调聚物丙烯酸酯（FTAs），空气-雪交换通量为正值，表明从雪到空气的净蒸发，而在2012年冬季和春季，全氟辛烷磺酰胺乙醇（Me/EtFOSEs）出现了向雪中的净沉降。FTOHs和FTAs的空气-雪交换受雪相控制，而FOSEs则受气相控制。空气-雪交换可能会显著影响北极地区中性PFASs的大气浓度。
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