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Dispersion, sorption and photodegradation of petroleum hydrocarbons in dispersant-seawater-sediment systems

机译:分散剂-海水-沉积物系统中石油烃的分散,吸附和光降解

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摘要

This work examined effects of model oil dispersants on dispersion, sorption and photodegradation of petroleum hydrocarbons in simulated marine systems. Three dispersants (Corexit 9500A, Corexit 9527A and SPC 1000) were used to prepare dispersed water accommodated oil (DWAO). While higher doses of dispersants dispersed more n-alkanes and PAHs, Corexit 9500A preferentially dispersed C11-C20 n-alkanes, whereas Corexit 9527A was more favorable for smaller alkanes (C10-C16), and SPC 1000 for C12-C28 n-alkanes. Sorption of petroleum hydrocarbons on sediment was proportional to TPH types/fractions in the DWAOs. Addition of 18 mg/L of Corexit 9500A increased sediment uptake of 2-3 ring PAHs, while higher dispersant doses reduced the uptake, due to micelle-enhanced solubilization effects. Both dispersed n-alkanes and PAHs were susceptible to photodegradation under simulated sunlight. For PAHs, both photodegradation and photo-facilitated alkylation were concurrently taking place. The information can facilitate sounder assessment of fate and distribution of dispersed oil hydrocarbons in marine systems. (C) 2016 Elsevier Ltd. All rights reserved.
机译:这项工作研究了模型油分散剂对模拟海洋系统中石油烃的分散,吸附和光降解的影响。使用三种分散剂(Corexit 9500A,Corexit 9527A和SPC 1000)来制备分散的含水油(DWAO)。虽然较高剂量的分散剂分散了更多的正构烷烃和PAH,但Corexit 9500A优先分散了C11-C20正构烷烃,而Corexit 9527A更适合较小的烷烃(C10-C16),而SPC 1000更适合C​​12-C28正构烷烃。 DWAO中石油碳氢化合物在沉积物上的吸附与TPH类型/馏分成正比。由于胶束增强的增溶作用,添加18 mg / L的Corexit 9500A可以增加2-3个环PAH的沉积物吸收量,而更高的分散剂剂量则可以降低吸收量。分散的正构烷烃和多环芳烃都容易在模拟阳光下发生光降解。对于PAH,同时发生了光降解和光促烷基化。该信息可以帮助更合理地评估海洋系统中分散的石油烃的命运和分布。 (C)2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Marine pollution bulletin》 |2016年第1期|526-538|共13页
  • 作者单位

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

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

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

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

    Auburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA|Bur Ocean Energy Management, GOM Reg, 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 spill; Dispersant; Petroleum hydrocarbon; Oil sorption; PAH; Photodegradation;

    机译:溢油;分散剂;石油烃;吸油;多环芳烃;光降解;
  • 入库时间 2022-08-17 13:34:22

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