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首页> 外文期刊>The Science of the Total Environment >Complications with remediation strategies involving the biodegradation and detoxification of recalcitrant contaminant aromatic hydrocarbons
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Complications with remediation strategies involving the biodegradation and detoxification of recalcitrant contaminant aromatic hydrocarbons

机译：涉及顽固性污染物芳香烃的生物降解和解毒的修复策略的并发症

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摘要

Environmentally persistent aromatic hydrocarbons known as unresolved complex mixtures (UCMs) derived from crude oil can be accumulated by, and elicit toxicological responses in, marine organisms (e.g. mussels, Mytilus edulis). Comprehensive two-dimensional gas chromatography time-of-flight mass-spectrometry (GCxGC-ToF-MS) previously revealed that these UCMs included highly branched alkylated aromatic hydrocarbons. Here, the effects of biodegradation on the toxicity and chemical composition of an aromatic UCM hydrocarbon fraction isolated from Tia Juana Pesado (TJP) crude oil were examined. 48 h exposure of mussels to the aromatic hydrocarbon fraction (F2) resulted in tissue concentrations of 900 μg g~(-1) (dry wt.) and ~45% decrease in clearance rate. Over 90% of the hydrocarbon burden corresponded to an UCM. Following a 5 day recovery period, GC×GC-ToF-MS analysis of the tissues indicated depuration of most accumulated hydrocarbons and clearance rates returned to those observed in controls. To assess the potential of biodegradation to reduce UCM toxicity, TJP F2 was exposed to bacteria isolated from Whitley Bay, UK, for 46 days. Mussels exposed to the undegraded TJP F2 from the abiotic control exhibited a reduction in clearance rate comparable with values for the pure crude oil TJP F2. Clearance rates of mussels exposed to biodegraded TJP F2 were statistically similar to seawater controls, suggesting biodegradation had reduced the TJP F2 toxicity. GC×GC-ToF-MS analysis revealed the same compound groups in the tissue of mussels exposed to pure TJP F2, undegraded TJP F2 and biodegraded TJP F2 samples; however >300 fewer compounds were observed in the biodegraded (954 compounds) compared to the undegraded TJP F2 (1261). The compound distributions were markedly different, possibly accounting for the decrease in toxicity. Extraction and analysis of pelleted bacterial cell material revealed that a significant proportion of the TJP F2 had adsorbed onto the cells. Thus extreme care must be taken in interpreting biodegradation data from recalcitrant UCM hydrocarbons.
机译：可以从海洋生物（例如贻贝，可食紫贻贝）中积累并引起其毒理学响应的环境持久性芳香烃，称为原油衍生的未分解的复杂混合物（UCM）。全面的二维气相色谱飞行时间质谱分析（GCxGC-ToF-MS）先前显示，这些UCM包含高度支化的烷基化芳烃。在此，研究了生物降解对从提亚胡安娜·佩萨多（TJP）原油中分离的芳香UCM烃馏分的毒性和化学组成的影响。贻贝暴露于芳烃馏分（F2）48小时导致组织浓度为900μgg〜（-1）（干重），清除率降低约45％。超过90％的碳氢化合物负荷对应于UCM。恢复期为5天后，对组织进行GC×GC-ToF-MS分析表明，大部分积累的碳氢化合物均已净化，清除率恢复到对照中观察到的水平。为了评估生物降解降低UCM毒性的潜力，将TJP F2暴露于从英国惠特利湾分离的细菌中46天。暴露于来自非生物对照的未降解TJP F2的贻贝的清除率降低与纯原油TJP F2的值相当。从统计学上讲，暴露于生物降解的TJP F2的贻贝的清除率与海水对照相似，表明生物降解降低了TJP F2的毒性。 GC×GC-ToF-MS分析显示，在暴露于纯TJP F2，未降解TJP F2和生物降解TJP F2样品的贻贝组织中，存在相同的化合物基团。然而，与未降解的TJP F2（1261）相比，在生物降解的化合物（954种化合物）中观察到的化合物少300多种。化合物的分布明显不同，可能是毒性降低的原因。沉淀的细菌细胞物质的提取和分析表明，很大比例的TJP F2已吸附到细胞上。因此，在解释顽固性UCM烃的生物降解数据时必须格外小心。

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  • 来源
    《The Science of the Total Environment》 |2010年第19期|P.4093-4101|共9页
  • 作者

    Max Frenzel; Alan Scarlett; Steven J. Rowland; Tamara S. Galloway; Sara K. Burton; Hilary M. Lappin-Scott; Andy M. Booth;

  • 作者单位

    Petroleum & Environmental Geochemistry Croup, SoGEES, University of Plymouth, Plymouth, PIA 8AA, UK School of Biosciences, University of Exeter, Exeter. EX4 4QD, UK;

    rnPetroleum & Environmental Geochemistry Croup, SoGEES, University of Plymouth, Plymouth, PIA 8AA, UK;

    rnPetroleum & Environmental Geochemistry Croup, SoGEES, University of Plymouth, Plymouth, PIA 8AA, UK;

    rnSchool of Biological Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK School of Biosciences, University of Exeter, Exeter, EX4 4QD, UK;

    rnSchool of Biosciences, University of Exeter, Exeter. EX4 4QD, UK;

    rnSchool of Biosciences, University of Exeter, Exeter. EX4 4QD, UK Bangor University, Bangor, Cwynedd 1157 2DC UK;

    rnSINTEF Materials and Chemistry, Department of Marine Environmental Technology, Trondheim, 7010, Norway;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    UCM; aromatic hydrocarbons; mytilus edulis; toxicity; biodegradation;

    机译：UCM;芳香烃紫癜毒性;生物降解;

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