The fate of per- and polyfluoroalkyl substances within a melting snowpack of a boreal forest
The fate of per- and polyfluoroalkyl substances within a melting snowpack of a boreal forest
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DOI：
10.1016/j.envpol.2014.04.032
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发表时间：
2014-08-01
影响因子：
8.9
通讯作者：
Ebinghaus, Ralf
中科院分区：
文献类型：
--
作者：
Codling, Garry;Halsall, Crispin;Ebinghaus, Ralf
在瑞典北部的积雪中系统地测量了全氟和多氟环物质（PFAS），以确定季节性融化期间的化学行为。PFOA和PFOS的中位（范围）浓度分别为66.5 pg L-1 （ND-122）和20.5 pg L-1（2.60-253）。较短链的C4和C5全氟烷基羧酸盐（PFCAs）和全氟烷基磺酸盐（pfsa）的平均浓度相似，高出10倍。在表层雪和深层雪之间观察到PFAS浓度和剖面的差异，有证据表明，随着融化的推进，PFAS向更深的雪层迁移。C4-9 PFCAs的化学负荷（ng m(-2)）随着熔体的进行逐渐降低，而C-4、C6-8 PFCAs和长链C10-12 PFCAs的化学负荷（ng m(-2)）增加。这种在逐渐减少的积雪中的富集是一种不寻常的现象，它将影响PFAS随着融水的析出以及随后进入集水区的地表水。(C) 2014 Elsevier Ltd.版权所有。
Per- and polyfluoroallcyl substances (PFAS) were measured systematically in a snowpack in northern Sweden to determine chemical behaviour during seasonal melt. Average PFAS concentrations were generally low, but displayed a wide range with median (range) concentrations of PFOA and PFOS of 66.5 pg L-1 (ND-122) and 20.5 pg L-1 (2.60-253) respectively. Average concentrations of the shorter chain, C4 and C5 perfluoroalkyl carboxylates (PFCAs) and perfluoroalkyl sulfonates (PFSAs), were similar to 10-fold higher. Differences in the PFAS concentrations and profile were observed between surface snow and deeper layers, with evidence of PFAS migration to deeper snow layers as melt progressed. Chemical loads (ng m(-2)) for C4-9 PFCAs decreased gradually as melt progressed, but increased for C-4, C6-8 PFSAs and the longer chain C10-12 PFCAs. This enrichment in the diminishing snowpack is an unusual phenomenon that will affect PFAS elution with meltwater and subsequent entry to catchment surface waters. (C) 2014 Elsevier Ltd. All rights reserved.