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首页> 外文期刊>Environmental Science & Technology >Distinguishing Natural from Anthropogenic Sources of Acid Extractable Organics in Groundwater near Oil Sands Tailings Ponds
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Distinguishing Natural from Anthropogenic Sources of Acid Extractable Organics in Groundwater near Oil Sands Tailings Ponds

机译：油砂尾矿池附近地下水中人为来源的酸性可萃取有机物的自然识别

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摘要

Distinguishing between naphthenic acids (NAs) associated with oil sands process-affected water (OSPW) and those found naturally in groundwaters in contact with the bituminous McMurray Formation poses a considerable analytical challenge to environmental research in Canada's oil sands region. Previous work addressing this problem combined high-resolution Orbitrap mass spectrometry with carbon isotope values generated by online pyrolysis (δ~(13)C_(pyr)) to characterize and quantify the acid extractable organics (AEOs) fraction containing NAs in the subsurface near an oil sands tailings pond. Here, we build upon this work through further development and application of these techniques at two different study sites near two different tailings ponds, in conjunction with the use of an additional isotopic tool—sulfur isotope analysis (δ~(34)S) of AEOs. The combined use of both δ~(13)C_(pyr) and δ~(34)S allowed for discrimination of AEOs into the three end-members relevant to ascertaining the NA environmental footprint within the region: (1) OSPW; (2) McMurray Formation groundwater (i.e., naturally occurring bitumen), and; (3) naturally occurring non-bitumen. A Bayesian isotopic mixing model was used to determine the relative proportions of these three sources in groundwater at both study sites. Although background levels of OSPW-derived AEOs were generally low, one sample containing 49—99% (95% credibility interval) OSPW-derived AEOs was detected within an inferred preferential flow-path, highlighting the potential for this technique to track tailings pond seepage.
机译：区分与油砂过程影响水（OSPW）相关的环烷酸（NAs）和与沥青质McMurray地层接触的地下水中天然存在的环烷酸（NAs）对加拿大油砂地区的环境研究提出了相当大的分析挑战。解决此问题的先前工作将高分辨率Orbitrap质谱与在线热解（δ〜（13）C_（pyr））生成的碳同位素值结合在一起，以表征和量化在靠近反应堆的地下亚甲基中的含酸可萃取有机物（AEOs）馏分。油砂尾矿池。在此，我们通过在两个不同的尾矿池附近的两个不同的研究地点进一步开发和应用这些技术，并结合使用其他同位素工具-AEO的硫同位素分析（δ〜（34）S），在此工作的基础上。结合使用δ〜（13）C_（pyr）和δ〜（34）S，可以将AEO区分为三个与确定该区域内NA环境足迹有关的末端成员：（1）OSPW; （2）麦克默里地层的地下水（即天然沥青），以及; （3）自然发生的非沥青。贝叶斯同位素混合模型用于确定两个研究地点的地下水中这三种来源的相对比例。尽管OSPW衍生的AEO的背景水平通常较低，但在推断的优先流径内检测到了一个样品，其样品中OSPW衍生的AEO含量为49-99％（可信区间为95％），突显了该技术跟踪尾矿池渗漏的潜力。

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  • 来源
    《Environmental Science & Technology》 |2020年第5期|2790-2799|共10页
  • 作者

    Jason M. E. Ahad; Hooshang Pakdel; Paul R. Gammon; Bernhard Mayer; Martine M. Savard; Kerry M. Peru; John V. Headley;

  • 作者单位

    Geological Survey of Canada Natural Resources Canada Quebec City Quebec GIK 9A9 Canada;

    INRS Eau Terre Environnement Quebec City Quebec GIK 9A9 Canada;

    Geological Survey of Canada Natural Resources Canada Ottawa Ontario K1A 0E8 Canada;

    Department of Geoscience University of Calgary Calgary Alberta T2N 1N4 Canada;

    Water Science and Technology Directorate Environment and Climate Change Canada Saskatoon Saskatchewan S7N 3H5 Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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