Absence of stable carbon isotope fractionation of saturated and polycyclic aromatic hydrocarbons during aerobic bacterial biodegradation

被引:124
作者
Mazeas, L
Budzinski, H
Raymond, N
机构
[1] Univ Bordeaux 1, Lab Physico & Toxicochim Syst Nat, UPRESA 5472, F-33405 Talence, France
[2] Univ Bordeaux 1, Lab Oceanog Biol, F-33120 Arcachon, France
关键词
D O I
10.1016/S0146-6380(02)00136-5
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Compound-specific stable carbon isotopic composition measurement is a promising discriminative tool for source identification of hydrocarbons in modern environments. Nevertheless, to be considered as a source tracer, the (13)C/(12)C ratio either has to be unmodified or at least modified in a predictable fashion by the different processes affecting hydrocarbons in the environment (photo-oxidation, evaporation, biodegradation, etc.). Possible isotopic fractionations introduced by microbial biodegradation have been investigated in this study. Stable carbon isotopic compositions of saturated hydrocarbons and phenanthrene compounds were stable during the course of a crude oil biodegradation experiment with a marine bacterial community. The (13)C/(12)C ratio of some standard 2-methylphenanthrene also remained constant during the course of a biodegradation experiment with a pure bacterial strain. These results indicate the absence of isotopic fractionation of hydrocarbons during aerobic bacterial biodegradation. Therefore, molecular stable carbon isotopic composition of n-alkanes and PAHs can be used for source identification of these compounds in environmental studies. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1259 / 1272
页数:14
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