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首页> 外文期刊>Environmental Science & Technology >Varying Relative Degradation Rates of Oil in Different Forms and Environments Revealed by Ramped Pyrolysis
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Varying Relative Degradation Rates of Oil in Different Forms and Environments Revealed by Ramped Pyrolysis

机译：倾斜热解揭示了不同形式和环境下油的相对降解速率的变化

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摘要

Degradation of oil contamination yields stabilized products by removing and transforming reactive and volatile compounds. In contaminated coastal environments, the processes of degradation are influenced by shoreline energy, which increases the surface area of the oil as well as exchange between oil, water, sediments, microbes, oxygen, and nutrients. Here, a ramped pyrolysis carbon isotope technique is employed to investigate thermochemical and isotopic changes in organic material from coastal environments contaminated with oil from the 2010 BP Deepwater Horizon oil spill. Oiled beach sediment, tar ball, and marsh samples were collected from a barrier island and a brackish marsh in southeast Louisiana over a period of 881 days. Stable carbon (~(13)C) and radiocarbon (~(14)C) isotopic data demonstrate a predominance of oil-derived carbon in the organic material. Ramped pyrolysis profiles indicate that the organic material was transformed into more stable forms. Our data indicate relative rates of stabilization in the following order, from fastest to slowest: high energy beach sediments ＞ low energy beach sediments ＞ marsh ＞ tar balls. Oil was transformed most rapidly where shoreline energy and the rates of oil dispersion and exchange with water, sediments, microbes, oxygen, and nutrients were greatest Still, isotope data reveal persistence of oil.
机译：油污的降解通过去除和转化反应性和挥发性化合物而产生稳定的产品。在受污染的沿海环境中，降解过程受到海岸线能量的影响，海岸线能量增加了油的表面积以及油，水，沉积物，微生物，氧气和养分之间的交换。在这里，采用倾斜热解碳同位素技术研究了2010年BP Deepwater Horizo​​n溢油污染的沿海环境中有机物质的热化学和同位素变化。在881天的时间里，从路易斯安那州东南部的隔离岛和微咸沼泽中收集了含油的海滩沉积物，柏油球和沼泽样品。稳定的碳（〜（13）C）和放射性碳（〜（14）C）同位素数据表明，有机材料中石油衍生的碳占主导地位。倾斜的热解曲线表明有机材料已转变为更稳定的形式。我们的数据显示出从最快到最慢的相对稳定速率，从高到低依次为：高能滩沉积物＞低能滩沉积物＞沼泽＞焦油球。在海岸线能量以及与水，沉积物，微生物，氧气和养分的交换速率最高的地方，石油的转化速度最快，但同位素数据显示出石油的持久性。

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  • 来源
    《Environmental Science & Technology》 |2014年第18期|10966-10974|共9页
  • 作者

    Matthew A. Pendergraft; Brad E. Rosenheim;

  • 作者单位

    Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana 70118, United States ,University of California at San Diego, Scripps Institution of Oceanography, La Jolla, California 92093 United States;

    College of Marine Science, University of South Florida, Saint Petersburg, Florida 33701, 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);
  • 原文格式 PDF
  • 正文语种 eng
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