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首页> 外文期刊>Environmental Science & Technology >Assessing the Source-to-Stream Transport of Benzotriazoles during Rainfall and Snowmelt in Urban and Agricultural Watersheds
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Assessing the Source-to-Stream Transport of Benzotriazoles during Rainfall and Snowmelt in Urban and Agricultural Watersheds

机译：评估城市和农业流域降雨和融雪期间苯并三唑的源流运输

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摘要

While benzotriazoles (BTs) are ubiquitous in urban waters, their sources and transport remain poorly characterized. We aimed to elucidate the origin and hydrological pathways of BTs in Toronto, Canada, by quantifying three BTs, electrical conductivity, and δ~(18)O in high-frequency streamwater samples taken during two rainfall and one snowmelt event in two watersheds with contrasting levels of urbanization. Average concentrations of total BTs (∑BT) were 1.3 to 110 times higher in the more urbanized Mimico Creek watershed relative to the primarily agricultural and suburban Little Rouge Creek. Strong correlations between upstream density of major roads and total BT concentrations or BT composition within all events implicate vehicle fluids as the key source of BTs in both watersheds. Sustained historical releases of BTs within the Mimico Creek watershed have likely led to elevated ∑BT in groundwater, with elevated concentrations observed during baseflow that are diluted by rainfall and surface runoff. In contrast, relatively constant concentrations, caused by mixing of equally contaminated baseflow and rainfall/surface runoff, are observed in the Little Rouge Creek throughout storm hydrographs, with an occasional first flush occurring at a subsite draining suburban land. During snowmelt, buildup of BTs in roadside snowpiles and preferential partitioning of BTs to the liquid phase of a melting snowpack leads to early peaks in ∑BT in both streams, except the sites in the Little Rouge Creek with low levels of vehicle traffic. Overall, a history of BT release and land use associated with urbanization have led to higher levels of BTs in urban areas and provide a glimpse into future BT dynamics in mixed use, (sub)urbanizing areas.
机译：虽然苯并三唑（BTs）在城市水域中无处不在，但其来源和运输仍不明确。我们旨在通过量化两个流域两次降雨和一次融雪事件中采集的高频溪水样品中的三个BT，电导率和δ〜（18）O，来阐明加拿大多伦多的BT的起源和水文路径。城市化水平。城市化的Mimico Creek流域的总BTs（∑BT）的平均浓度比主要是农业和郊区的Little Rouge Creek高1.3到110倍。在所有事件中，主要道路的上游密度与总BT浓度或BT组成之间的强相关性暗示着车辆液体是这两个流域中BT的主要来源。 Mimico Creek流域内BT的持续历史释放可能导致地下水中∑BT升高，在基流期间观察到浓度升高，但降雨和地表径流稀释了这些浓度。相反，在整个暴雨水位图中，在小胭脂河中观察到了受相同污染的底流和降雨/地表径流混合引起的相对恒定的浓度，偶尔在郊区排水的次地点发生第一次冲刷。在融雪期间，路边积雪中的BT积累以及将BT优先分配到融化的积雪的液相中，导致这两个溪流中ΣBT的早期峰值，除了小鲁克溪的车辆流量较低。总体而言，BT释放和与城市化相关的土地使用的历史导致城市地区的BT较高，并提供了混合用途（亚化）地区未来BT动态的一瞥。

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  • 来源
    《Environmental Science & Technology》 |2017年第8期|4191-4198|共8页
  • 作者

    Abha Parajulee; Ying Duan Lei; Amila O. De Silva; Xiaoshu Cao; Carl P. J. Mitchell; Frank Wania;

  • 作者单位

    Department of Physical and Environmental Sdences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario MIC 1A4, Canada;

    Department of Physical and Environmental Sdences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario MIC 1A4, Canada;

    Water Science and Technology Directorate, Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada;

    Department of Physical and Environmental Sdences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario MIC 1A4, Canada;

    Department of Physical and Environmental Sdences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario MIC 1A4, Canada;

    Department of Physical and Environmental Sdences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario MIC 1A4, 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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