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首页> 外文期刊>Environmental Science & Technology >Isoproturon Reappearance after Photosensitized Degradation in the Presence of Triplet Ketones or Fulvic Acids
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Isoproturon Reappearance after Photosensitized Degradation in the Presence of Triplet Ketones or Fulvic Acids

机译：在三重态酮或黄腐酸存在下光敏降解后异丙隆重新出现

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摘要

Isoproturon (IPU) is a phenylurea herbicide used to control broad-leaf grasses on grain fields. Photosensitized transformation induced by excited triplet states of dissolved organic matter (~3DOM~*) has been identified as an important degradation pathway for IPU in sunlit waters, but the reappearance of IPU in the absence of light is observed after the initial photolysis. In this study, we elucidate the kinetics of this photodegradation and dark-reappearance cycling of IPU in the presence of DOM proxies (aromatic ketones and reference fulvic acids). Using mass spectrometry and nuclear magnetic resonance spectroscopic techniques, a semi-stable intermediate (IPU_(int)) was found to be responsible for IPU reversion and was identified as a hydroperoxyl derivative of IPU. IPU_(int) is photogenerated from incorporation of diatomic oxygen to IPU and is subjected to thermolysis whose rate depends on temperature, pH, the presence of DOM, and inorganic ions. These results are important to understand the overall aquatic fate of IPU and structurally similar compounds under diurnal conditions.
机译：异丙隆（IPU）是一种苯脲除草剂，用于控制粮田上的阔叶草。溶解有机物（〜3DOM〜*）的激发三重态激发引起的光敏转化已被确定为阳光照射水中IPU的重要降解途径，但是在初始光解后，IPU在没有光照的情况下会重新出现。在这项研究中，我们阐明了在存在DOM代理（芳族酮和参考富里酸）的情况下IPU的这种光降解和黑暗再现循环的动力学。使用质谱和核磁共振波谱技术，发现半稳定的中间体（IPU_（int））导致IPU还原，并被确定为IPU的氢过氧衍生物。 IPU_（int）是通过将双原子氧掺入IPU中而产生的，并进行热解，其速率取决于温度，pH，DOM的存在和无机离子。这些结果对于了解IPU和日间条件下结构相似的化合物的总体水生生物很重要。

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  • 来源
    《Environmental Science & Technology》 |2016年第22期|12250-12257|共8页
  • 作者

    Chenyi Yuan; Mrinal Chakraborty; Silvio Canonica; Linda K. Weavers; Christopher M. Hadad; Yu-Ping Chin;

  • 作者单位

    Environmental Science Graduate Program, The Ohio State University, Columbus, Ohio 43210, United States;

    Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States,International Institute of Nano and Molecular Medicine, University of Missouri Columbia, Columbia, Missouri 65211;

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

    Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, United States;

    Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States;

    School of Earth Sciences, The Ohio State University, Columbus, Ohio 43210, United States;

  • 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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