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首页> 外文期刊>Environmental Science & Technology >Hyporheic Exchange Controls Fate of Trace Organic Compounds in an Urban Stream
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Hyporheic Exchange Controls Fate of Trace Organic Compounds in an Urban Stream

机译：疏水交换控制城市河流中痕量有机化合物的命运

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摘要

First-order half-lives for 26 trace organic (TrOCs) were determined in the hyporheic zone (HZ) and along a 3 km reach of a first-order stream in m South Australia during both dry and wet seasons. Two salt in-stream tracer experiments were conducted and evaluated using a transient storage model to characterize seasonal differences in stream residence time and transient storage. Lagrangian and time-integrated surface water sampling were conducted to calculated half-lives in the surface water. Half-lives in the were calculated using porewater samples obtained from a modified mini-point sampler and hyporheic residence times measured via active heat-pulse sensing. Half of the investigated TrOCs (e.g., oxazepam, olmesartan, candesartan) were not significantly removed along both the investigated river stretch and the sampled hyporheic flow paths. The remaining TrOCs (e.g., metformin, guanylurea, valsartan) were found to be significantly removed in the HZ and along the river stretch with relative removals in the HZ correlating to reach-scale relative removals. Using the modeled transport parameters, it was estimated that wet season reach-scale removal of TrOCs was predominately caused by removal in the HZ when the intensity of hyporheic exchange was also higher. Factors that increase HZ exchange are thus likely to promote in-stream reactivity of TrOCs.
机译：在干流和湿润季节，在流变带（HZ）中以及沿着南澳大利亚m的一级流的3 km范围内，确定了26种微量有机物（TrOCs）的一级半衰期。进行了两个盐流示踪剂实验，并使用瞬态存储模型进行了评估，以表征流停留时间和瞬态存储的季节性差异。拉格朗日和时间积分的地表水采样用于计算地表水中的半衰期。使用从改进的微型点采样器获得的孔隙水样本计算半衰期，并通过主动热脉冲传感测量流变停留时间。被调查的TrOCs的一半（例如，奥沙西m，奥美沙坦，坎地沙坦）在被调查的河段和采样的流变路径上均未得到明显去除。发现剩余的TrOCs（例如二甲双胍，鸟嘌呤脲，缬沙坦）在HZ和沿河带被显着清除，HZ中的相对清除量与达到规模的相对清除量相关。使用模型化的运输参数，据估计，潮湿季节达到规模的TrOCs去除主要是由HZ中的去除引起的，同时低交换性的交换强度也更高。因此，增加HZ交换的因素可能会促进TrOC的流内反应性。

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  • 来源
    《Environmental Science & Technology》 |2018年第21期|12285-12294|共10页
  • 作者

    Schaper Jonas L.; Posselt Malte; MoCallum James L.; Banks Eddie W.; Hoehne Anja; Meinikmann Karin; Shanafield Margaret A.; Batelaan Okke; Lewandowski Joerg;

  • 作者单位

    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Ecohydrol, Muggelseedamm 310, D-12587 Berlin, Germany;

    Stockholm Univ, Dept Environm Sci & Analyt Chem ACES, S-11418 Stockholm, Sweden;

    Tech Univ Berlin, Chair Water Qual Engn, Str 17 Juni 135, D-10623 Berlin, Germany;

    Humboldt Univ, Dept Geog, Rudower Chaussee 16, D-12489 Berlin, Germany;

    Flinders Univ S Australia, Coll Sci & Engn, Natl Ctr Groundwater Res & Training, GPO Box 2100, Adelaide, SA 5001, Australia;

  • 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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