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首页> 外文期刊>Environmental Science & Technology >Beyond the Rayleigh Equation: Reactive Transport Modeling of Isotope Fractionation Effects to Improve Quantification of Biodegradation
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Beyond the Rayleigh Equation: Reactive Transport Modeling of Isotope Fractionation Effects to Improve Quantification of Biodegradation

机译:超越瑞利方程:同位素分馏效应的反应输运模型,以改善生物降解的量化

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摘要

The Rayleigh equation is commonly applied to evaluate the extent of degradation at contaminated sites for which compound-specific isotope analysis (CSIA) data are available. However, it was shown recently that(ⅰ)the Rayleigh equation systematically underestimates the extent of biodegradation in physically heterogeneous systems, while (ⅱ) it overestimates biodegradation if sorption-based carbon isotope fractionation is relevant. This paper further explores these two isotope effects not captured by the Rayleigh equation by means of a numerical modeling approach. The reactive multicomponent transport simulations show that the systematic underestimation is considerably larger for fringe-controlled and Monod-type degradation reactions than for previously assumed redox-insensitive first-order degradation kinetics, while forthe nonsteady state front portion of plumes, the Rayleigh equation may falsely indicate the occurrence of and/or overestimate biodegradation. The latter anomaly results from carbon isotope fractionation during sorption. It occurs for both supply-controlled degradation at the plume fringe and slow, reaction-controlled degradation inside the plume core. The numerical model approach enables a more accurate interpretation of CSIA data and thereby improves the quantification of biodegradation processes.
机译:瑞利方程通常用于评估受污染地点的降解程度,对于这些地点可获得化合物特异性同位素分析(CSIA)数据。但是,最近发现(ⅰ)瑞利方程系统地低估了物理异质系统中生物降解的程度,而(ⅱ)如果基于吸附的碳同位素分馏是相关的,则高估了生物降解的程度。本文通过数值建模方法进一步探讨了瑞利方程未捕获的这两种同位素效应。反应性多组分迁移模拟表明,对于条纹控制和Monod型降解反应,系统的低估要比先前假定的对氧化还原不敏感的一阶降解动力学大得多,而对于羽流的非稳态前部,瑞利方程可能会错误地得出结论。表明发生和/或高估了生物降解。后者的异常是由吸附过程中碳同位素分级分离引起的。发生这种情况的原因是,烟羽边缘处的供应受控降解,而烟羽芯内部的反应控制缓慢降解。数值模型方法可以更准确地解释CSIA数据,从而改善生物降解过程的量化。

著录项

  • 来源
    《Environmental Science & Technology》 |2008年第7期|p.2457-2463|共7页
  • 作者单位

    Department of Hydrology and Geo-Environmental Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, NL-1081 HV Amsterdam, The Netherlands;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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