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首页> 外文期刊>Journal of Hazardous Materials >Effects of oil dispersants on photodegradation of pyrene in marine water
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Effects of oil dispersants on photodegradation of pyrene in marine water

机译：油分散剂对海水中pyr光降解的影响

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摘要

This work investigated effects of a popular oil dispersant (Corexit EC9500A) on UV- or sunlight-mediated photodegradation of pyrene (a model polycyclic aromatic hydrocarbon) in seawater. The presence of 18 and 180 mg/L of the dispersant increased the first-order photodegradation rate by 5.5% and 16.7%, respectively, and reduced or ceased pyrene volatilization. By combining individual first-order rate laws for volatilization and photodegradation, we proposed an integrated kinetic model that can adequately predict the overall dissipation of pyrene from seawater. Mechanistic studies indicated that superoxide radicals played a predominant role in pyrene photodegradation, and the dispersant enhanced formation of superoxide radicals. 1-Hydroxypyrene was the main intermediate regardless of the dispersant, suggesting that electrons were transferred from excited pyrene to oxygen. In the presence of 18 mg/L of the dispersant, the photodegradation rate increased with increasing ionic strength and temperature, but decreased with increasing HA concentration, and remained independent of solution pH. The results are important in understanding roles of oil dispersants on environmental fate of persistent oil components in natural and engineered systems. (C) 2015 Elsevier B.V. All rights reserved.
机译：这项工作研究了一种流行的油分散剂（Corexit EC9500A）对紫外线或阳光介导的（（一种模型多环芳烃）在海水中的光降解的影响。 18和180 mg / L的分散剂的存在分别使一级光降解率提高了5.5％和16.7％，并减少或停止了vol的挥发。通过结合各个一级速率定律进行挥发和光降解，我们提出了一个集成动力学模型，该模型可以充分预测海水中pyr的总体消散。机理研究表明，超氧自由基在pyr的光降解中起主要作用，而分散剂促进了超氧自由基的形成。 1-羟基py是主要的中间体，与分散剂无关，这表明电子从激发的transferred转移到氧气。在18 mg / L的分散剂存在下，光降解速率随离子强度和温度的升高而增加，但随HA浓度的升高而降低，并且与溶液的pH无关。该结果对于理解油分散剂在天然和工程系统中对持久性油组分的环境命运的作用至关重要。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Hazardous Materials》 |2015年第28期|142-150|共9页
  • 作者

    Gong Yanyan; Fu Jie; OReilly S. E.; Zhao Dongye;

  • 作者单位

    Auburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA|Nankai Univ, Coll Environm Sci & Engn, Tianjin 300071, Peoples R China;

    Auburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA;

    US Dept Interior, Gulf Mexico OCS, Off Environm, New Orleans, LA 70123 USA;

    Auburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oil dispersant; PAHs; Photodegradation; Oil weathering; Marine pollution;

    机译：石油分散剂;多环芳烃;光降解;石油老化;海洋污染;

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