| Combining hydropyrolysis and compound specific stable isotope measurements to identify sources of biodegrade PAHs in soils and sediments |
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| 作者姓名： | Chenggong SUN Gbolagade Olalere Wisdom Ivwurie Mick Cooper Christopher H. Vane Colin Snape |
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| 作者单位： | [1]University of Nottingham, University Park, Nottingham, NG7 2RD, UK [2]Christover H. Vane, British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NGI2 5GG UK |
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| 摘 要： | Compound-specific ^13C/^12C isotope ratio measurements have successfully been demonstrated as a valuable technique for polycyclic aromatic hydrocarbons （PAHs） source apportionment in a number of studies. However, under certain circumstances, where the PAils matrix has been subjected to heavy biodegradation/phytoremediation, and the isotopic signatures for PAHs are overlapping for some sources, further constraints are needed for unambiguous source apportionment. It has been shown that asphaltenes retain useful molecular and isotopic information of biogeochemical significance for oil-source rock correlation （1-3）, which can be accessed via hydropyrolysis. Given that stable isotopic ratios of PAHs are not significantly affected by biodegradation and that hydropyrolysis of asphaltenes can generate representative molecular profiles expected for non-biodegraded oils, this has enabled an analytical methodology combining hydropyrolysis and compound-specific stable isotope measurements to be developed for source apportioning hydrocarbons in biodegraded environmental samples. In this study, the PAHs released from hydropyrolysis of asphaltenes from a variety of primary sources （e.g. crude oils, low and high temperature coal tars, and river sediments） were characterized in regard to their molecular distributions and ^13C/^12C isotope ratios. Application to samples previously examined from an area close to a former carbonization plant is described where unambiguous source apportionment could not be achieved previously for the PAHs due to likely environmental alternation （3）. For both low and high temperature coal tar, the molecular profiles for bound aromatics are broadly similar to their free aromatic counterparts. The stable carbon isotope ratios for the major PAH components present in bound aromatics （-23‰） are significantly more enriched in ^13C than the free aromatics （-26‰）,
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| 关 键 词： | 生物降解作用 碳 同位素 烷基化物 土壤污染 沉积物 |
Combining hydropyrolysis and compound specific stable isotope measurements to identify sources of biodegrade PAHs in soils and sediments |
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| Chenggong SUN Gbolagade Olalere Wisdom Ivwurie Mick Cooper Christopher H. Vane Colin Snape.Combining hydropyrolysis and compound specific stable isotope measurements to identify sources of biodegrade PAHs in soils and sediments[J].Chinese Journal of Geochemistry,2006,25(B08):90-91. |
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