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首页> 外文期刊>Environmental Science & Technology >Effect of Dissolved Organic Matter on the Transformation of Contaminants Induced by Excited Triplet States and the Hydroxyl Radical
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Effect of Dissolved Organic Matter on the Transformation of Contaminants Induced by Excited Triplet States and the Hydroxyl Radical

机译：溶解有机物对激发三重态和羟自由基诱导的污染物转化的影响

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摘要

ABSTRACT: Dissolved organic matter (DOM) has recently been shown to reduce the transformation rate of various aqueous organic contaminants submitted to oxidation by excited triplet states, apparently by inhibiting the transformation of oxidation intermediates. The main goals of the present study were to evaluate in more detail the effect of concentration and type of DOM on the triplet-induced transformation rate of four selected organic compounds and to check for an analogous inhibition effect in the case of oxidation induced by hydroxyl radical. A marked inhibition by DOM of triplet-induced oxidation was observed for N,N-dimethylaniline (DMA) and the two antibiotics sulfamethoxazole (SMX) and trimethoprim (TRI), with DOM of terrestrial origin being a more effective inhibitor than DOM of aquatic origin. The results are important to understand the role of DOM both as a photosensitizer and as an inhibitor for the triplet-induced transformation of aquatic contaminants. In contrast, no DOM-induced reduction in second-order rate constant could be observed in competition kinetics experiments for the reaction of hydroxyl radical with a series of 15 organic compounds, covering several classes of aromatic contaminants, indicating that Suwannee River fulvic acid (SRFA) used as reference DOM does not affect this reaction mechanism.
机译：摘要：最近显示，溶解的有机物（DOM）可以降低通过激发三重态发生氧化的各种水性有机污染物的转化率，这显然是通过抑制氧化中间体的转化来实现的。本研究的主要目的是更详细地评估DOM的浓度和类型对四种选择的有机化合物的三重态诱导的转化率的影响，并检查在羟基自由基引起的氧化反应中是否具有类似的抑制作用。 。对于N，N-二甲基苯胺（DMA）以及两种抗生素磺胺甲恶唑（SMX）和甲氧苄氨嘧啶（TRI），观察到DOM对三重态诱导的氧化的抑制作用明显，而陆生DOM比水生DOM更有效。 。这些结果对于理解DOM作为光敏剂和三重态诱导的水生污染物转化抑制剂的作用非常重要。相比之下，在竞争动力学实验中，没有观察到DOM引起的二阶速率常数的降低，该反应是羟基自由基与一系列15种有机化合物的反应，涵盖了几类芳香族污染物，这表明Suwannee河富叶酸（SRFA） ）用作参考DOM不会影响此反应机制。

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  • 来源
    《Environmental Science & Technology》 |2011年第4期|p.1334-1340|共7页
  • 作者

    Jannis Wenk; Urs von Gunten; Silvio Canonica;

  • 作者单位

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Diibendorf, Switzerland,Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, CH-8092, Zürich, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Diibendorf, Switzerland,Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, CH-8092, Zürich, Switzerland,School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

    Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600, Diibendorf, Switzerland;

  • 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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