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首页> 外文期刊>Environmental Science & Technology >Stable Carbon Isotope Enrichment Factors for c/s-1,2-Dichloroethene and Vinyl Chloride Reductive Dechlorination by Dehalococcoides
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Stable Carbon Isotope Enrichment Factors for c/s-1,2-Dichloroethene and Vinyl Chloride Reductive Dechlorination by Dehalococcoides

机译：c / s-1,2-二氯乙烯和氯乙烯经脱卤代球菌还原脱氯的稳定碳同位素富集因子

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Compound-specific stable isotope analysis (CSIA) is a promising tool for monitoring in situ microbial activity, and enrichment factors (e values) determined using CSIA can be employed to estimate compound transformation. Although £ values for some dechlorination reactions catalyzed by Dehalococcoides (Dhc) have been reported, reproducibility between independent experiments, variability between different Dhc strains, and congruency between pure and mixed cultures are unknown. In experiments conducted with pure cultures of Dhc sp. strain BAV1, £ values for 1,1-DCE, cis-DCE, rrans-DCE, and VC were -5.1, -14.9, -20.8, and -23.2%o, respectively. The £ value for 1,1-DCE dechlorination was 48.9% higher than the value reported in a previous study, but £ values for other chlorinated ethenes were equal between independent experiments. For the dechlorination of cis-DCE and VC by Dhc strains BAV1, FL2, GT, and VS, average £ values were -18.4 and -23.2%o, respectively. cis-DCE and VC £ values determined in pure Dhc cultures with different reductive dehalogenase genes (e.g., vcrA vs bvcA) varied by less than 36.8 and 8.3%, respectively. In the BDI consortium, £ values for cis-DCE and VC dechlorination were - 25.3%o and -19.9%o, 31.6% higher and 15.3% lower, respectively, compared to the average £ value for Dhc pure cultures. As cis-DCE and VC £ values are all within the same order-of-magnitude and fractionation is always measured during Dhc dechlorination, CSIA may be a valuable approach for monitoring in situ cis-DCE and VC reductive dechlorination.
机译：化合物特异性稳定同位素分析（CSIA）是监测原位微生物活性的有前途的工具，使用CSIA确定的富集因子（e值）可用于估算化合物转化。尽管已报道了由脱卤代球菌（Dhc）催化的某些脱氯反应的£值，但未知独立实验之间的可重复性，不同Dhc菌株之间的变异性以及纯培养物和混合培养物之间的一致性。在纯Dhc菌种的实验中。 BAV1菌株的1,1-DCE，cis-DCE，rrans-DCE和VC的£分别为-5.1，-14.9，-20.8和-23.2％o。 1,1-DCE脱氯的£值比以前的研究报告的值高48.9％，但其他氯化乙烯的£值在独立实验之间相同。对于Dhc菌株BAV1，FL2，GT和VS对顺-DCE和VC的脱氯作用，平均£值分别为-18.4和-23.2％o。在具有不同还原性脱卤素酶基因（例如vcrA与bvcA）的纯Dhc培养物中测定的cis-DCE和VC£值分别变化小于36.8和8.3％。在BDI联盟中，与Dhc纯培养物的平均£值相比，顺式DCE和VC脱氯的£值分别为-25.3％o和-19.9％o，分别高出31.6％和低15.3％。由于cis-DCE和VC£值都在同一数量级内，并且在Dhc脱氯过程中始终测量分馏，因此CSIA可能是监测原位cis-DCE和VC还原性脱氯的一种有价值的方法。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2951-2957|共7页
  • 作者

    Kelly E. Fletcher; Ivonne Nijenhuis; Hans-Hermann Richnow; Frank E. Loftier;

  • 作者单位

    School of Civil and Environmental Engineering Atlanta, Georgia 30332, United States;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstrasse 15,D-04318 Leipzig, Germany;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstrasse 15,D-04318 Leipzig, Germany;

    School of Civil and Environmental Engineering Atlanta, Georgia 30332, United States,School of Biology, Georgia Institute of Technology, 311 Ferst Drive,Atlanta, Georgia 30332, United States,Department of Microbiology and Department of Civil and Environmental Engineering, University of Tennessee, Knoxville,Tennessee 37996, United States,Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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