Integrated carbon and chlorine isotope modeling: applications to chlorinated aliphatic hydrocarbons dechlorination.

Integrated carbon and chlorine isotope modeling: applications to chlorinated aliphatic hydrocarbons dechlorination.
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集成碳和氯同位素建模:在氯化脂肪烃脱氯中的应用

DOI:
10.1021/es304053h
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发表时间:
2013
影响因子:
11.4
通讯作者:
M. Rolle
M. Rolle
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
S. B. Haderlein;M. Rolle

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我们提出了一个自洽的方法来预测氯代烃降解过程中的碳和氯同位素比值的演变。该方法处理明确的同位素不同的C-Cl键的裂解,从而认为,同时,结合碳-氯同位素。为了说明所提出的建模方法,我们专注于氯化乙烯的还原脱卤。我们比较我们的方法与目前可用的方法,其中碳和氯同位素分别处理。新的方法提供了一个准确的描述双同位素效应,无论同位素分馏的程度和实验系统的物理特性。我们成功地应用了新的方法发表的实验结果,在良好的混合系统中的氯化乙烯的脱卤和传质限制的情况下,控制生物降解的总体速率。我们的自洽双同位素建模方法的优势被证明是最明显的碳和氯的同位素分馏因子显着不同,并与传质限制的系统,其中物理和(生物)化学转化过程影响所观察到的同位素值。
We propose a self-consistent method to predict the evolution of carbon and chlorine isotope ratios during degradation of chlorinated hydrocarbons. The method treats explicitly the cleavage of isotopically different C–Cl bonds and thus considers, simultaneously, combined carbon–chlorine isotopologues. To illustrate the proposed modeling approach we focus on the reductive dehalogenation of chlorinated ethenes. We compare our method with the currently available approach, in which carbon and chlorine isotopologues are treated separately. The new approach provides an accurate description of dual-isotope effects regardless of the extent of the isotope fractionation and physical characteristics of the experimental system. We successfully applied the new approach to published experimental results on dehalogenation of chlorinated ethenes both in well-mixed systems and in situations where mass-transfer limitations control the overall rate of biodegradation. The advantages of our self-consistent dual isotope modeling approach proved to be most evident when isotope fractionation factors of carbon and chlorine differed significantly and for systems with mass-transfer limitations, where both physical and (bio)chemical transformation processes affect the observed isotopic values.
DOI: 10.1021/es301058z
发表时间: 2012-06
影响因子: 11.4
作者:
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通讯作者: B. V. van Breukelen;M. Rolle
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