甲苯的同位素分馏：表征微生物原位降解的一个视角
Isotope fractionation of toluene: a perspective to characterise microbial in situ degradation.
作者信息
Richnow H H, Vieth A, Kastner M, Gehre M, Meckenstock R U
机构信息
UFZ Centre for Environmental Research Leipzig Halle Ltd., Permoserstr. 15, 04318 Leipzig, Germany.
出版信息
ScientificWorldJournal. 2002 May 8;2:1227-34. doi: 10.1100/tsw.2002.210.
A concept to assess in situ biodegradation of organic contaminants in aquifers is presented. The alteration of the carbon isotope composition of contaminants along the groundwater flow path indicates microbial degradation processes and can be used as an indicator for in situ biodegradation. The Rayleigh equation was applied to calculate the percentage of the in situ biodegradation (B[%]) using the change in the isotopic composition of contaminants (Rt/R0) along the ground water flow path and a kinetic carbon isotope fractionation factor (alphaC) derived from defined biodegradation experiments in the laboratory. When the groundwater hydrology is known and a representative source concentration (C0) for a groundwater flow path can be determined, the extent of in situ biodegradation can be quantified.
本文提出了一种评估含水层中有机污染物原位生物降解的概念。污染物碳同位素组成沿地下水流路径的变化表明了微生物降解过程，可作为原位生物降解的指标。应用瑞利方程，利用污染物同位素组成沿地下水流路径的变化（Rt/R0）和从实验室确定的生物降解实验中得出的动力学碳同位素分馏系数（alphaC）来计算原位生物降解的百分比（B[%]）。当地下水水文学已知且能确定地下水流路径的代表性源浓度（C0）时，就可以量化原位生物降解的程度。
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