Characterizing the PAHs in surface waters and snow in the Athabasca region: Implications for identifying hydrological pathways of atmospheric deposition
Characterizing the PAHs in surface waters and snow in the Athabasca region: Implications for identifying hydrological pathways of atmospheric deposition
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DOI：
10.1016/j.scitotenv.2017.06.051
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发表时间：
2017-12-15
影响因子：
9.8
通讯作者：
Gibson, J. J.
中科院分区：
文献类型：
--
作者：
Birks, S. J.;Cho, S.;Gibson, J. J.
多环芳烃的组成，目前在雪和表面沃茨在阿萨巴斯卡油砂区（AOSR）的特点，以确定主要贡献者在该地区的河流和湖泊中检测到的有机物。2011年三个监测项目测量的多环芳烃浓度被用来比较整个AOSR的雪和地表沃茨的多环芳烃成分。2011年数据集包括105个雪、272个河流和3个湖泊样本中34种母体和烷基化PAH化合物的总浓度（溶解+颗粒）。河流中多环芳烃的浓度随季节变化，7月最高。在河流中的多环芳烃浓度增加的时间恰逢高流量的河流在春季洪峰，这表明，这一重大水文事件可能发挥重要作用，在提供多环芳烃的河流。然而，在此期间，在河流中存在的多环芳烃的组成不同的多环芳烃存在于雪中的组成，这表明，直接径流和释放的多环芳烃积累在雪中可能不是多环芳烃的主要来源阿萨巴斯卡河及其支流。相反，融雪可能会间接增加多环芳烃，由于水文过程，如侵蚀的河流通道，再动员的多环芳烃的沉积物，增加集水径流，和融雪引起的地下水输入在这个动态水文期间。更好地了解运输过程中的PAH配置文件的转换沿着表面和地下流动路径在湿地为主的北方流域将提高识别潜在的来源和途径在该地区。成分差异突出了在具有多种潜在自然和人为来源的区域中确定多环芳烃来源的挑战，特别是当潜在的传输途径包括空气，土壤和水时。(C)2017爱思唯尔B.V.保留所有权利。
The composition of polycyclic aromatic hydrocarbons present in snow and surface waters in the Athabasca Oil Sands Region (AOSR) was characterized in order to identify major contributors to the organics detected in rivers and lakes in the region. PAH concentrations, measured by three monitoring programs in 2011, were used to compare the PAH compositions of snow and surface waters across the AOSR. The 2011 dataset includes total (dissolved + particulate) concentrations of thirty-four parent and alkylated PAH compounds in 105 snow, 272 river, and 3 lake samples. The concentration of PAHs in rivers varies seasonally, with the highest values observed in July. The timing of increases in PAH concentrations in rivers coincides with the high river discharge during the spring freshet, indicating that this major hydrological event may play an important role in delivering PAHs to rivers. However, the composition of PAHs present in rivers during this period differs from the composition of PAHs present in snow, suggesting that direct runoff and release of PAHs accumulated on snow may not be the major source of PAHs to the Athabasca River and its tributaries. Instead, snowmelt may contribute indirectly to increases in PAHs due to hydrological processes such as erosion of stream channels, remobilization of PAH-containing sediments, increased catchment runoff, and snowmelt-induced groundwater inputs during this dynamic hydrologic period. Better understanding of transformations of PAH profiles during transport along surface and subsurface flow paths in wetland-dominated boreal catchments would improve identification of potential sources and pathways in the region. The compositional differences highlight the challenges in identifying the origins of PAHs in a region with multiple potential natural and anthropogenic sources particularly when the potential transport pathways include air, soil and water. (C) 2017 Elsevier B.V. All rights reserved.