Vieth A, Müller J, Strauch G, Kästner M, Gehre M, Meckenstock R U, Richnow H H
UFZ Centre for Environmental Research Leipzig-Halle, 04318 Leipzig, Germany.
Isotopes Environ Health Stud. 2003 Jun;39(2):113-24. doi: 10.1080/1025601031000108688.
Stable carbon isotope analysis of tetrachloroethene (PCE) and trichloroethene (TCE) was applied to evaluatenatural attenuation processes in the upper Quaternary and lower Tertiary aquifer in the area of a former dry-cleaning plant located in Leipzig, Germany. Groundwater samples were taken during one monitoring campaign in 2001. The 13C enrichment in contaminants along the water flow path suggested that both, PCE and TCE were degraded in the Quaternary aquifer. The enrichment of 13C in the residual PCE fraction and an isotope fractionation factor from laboratory experiments were used to calculate the extent of biodegradation in the Quatemary aquifer. These calculations indicated that a major portion of PCE was biodegraded in the course of the plume. In the Tertiary aquifer the carbon isotope ratios of PCE and TCE indicated that the decreasing concentrations of these contaminants were probably not caused by microbial processes.
运用四氯乙烯（PCE）和三氯乙烯（TCE）的稳定碳同位素分析方法，对德国莱比锡一家 former 干洗厂所在区域的上第四纪和下第三纪含水层中的自然衰减过程进行评估。2001年在一次监测活动期间采集了地下水样本。沿水流路径的污染物中 13C 的富集表明，PCE 和 TCE 在第四纪含水层中均发生了降解。利用残留 PCE 组分中 13C 的富集以及实验室实验得到的同位素分馏系数，计算了第四纪含水层中的生物降解程度。这些计算表明，大部分 PCE 在羽流过程中被生物降解。在第三纪含水层中，PCE 和 TCE 的碳同位素比值表明，这些污染物浓度的降低可能不是由微生物过程引起的。
