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Reactive Transport Modeling of Chromium Isotope Fractionation during Cr(VI) Reduction

机译：Cr（VI）还原过程中铬同位素分馏的反应性传输模型

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摘要

Chromium isotope fractionation is indicative of mass-transfer processes, such as reduction of Cr(Ⅵ) to Cr(Ⅲ) during groundwater remediation. Laboratory experiments comparing batch and column treatment of Cr(Ⅵ) using organic carbon suggest that the associated isotope fractionation may be influenced by solute-transport mechanisms. These batch and column experiments were simulated using the reactive transport model MIN3P to further evaluate the effects of Cr reduction and transport on isotope fractionation under saturated flow conditions. Simulation of the batch experiment provided a good fit to the experimental data, where a fractionation factor (α_(53)) of 0.9965 was attributed to a single, dominant Cr(Ⅵ) removal mechanism. Calibration of the column simulations to the experimental results suggested the presence of a second, more rapid Cr(Ⅵ) removal mechanism with α_(53) = 0.9992. Results from this study demonstrate that the interpretation of Cr isotope fractionation during reduction can be complex, particularly where multiple removal mechanisms are evident. Reactive transport modeling of Cr isotope fractionation can provide a quantitative assessment of the contaminant removal mechanisms, thus improving the application of Cr isotope measurements as a tool to track Cr(Ⅵ) migration and attenuation in groundwater.
机译：铬同位素分级表明了传质过程，例如在地下水修复过程中将Cr（Ⅵ）还原为Cr（Ⅲ）。比较有机碳分批处理和六氯联苯处理的室内实验表明，相关的同位素分馏可能受溶质传输机制的影响。使用反应迁移模型MIN3P模拟了这些批处理和柱实验，以进一步评估在饱和流动条件下Cr还原和迁移对同位素分馏的影响。批处理实验的仿真结果很好地拟合了实验数据，其中分离因子（α_（53））为0.9965，这归因于单一的主要Cr（Ⅵ）去除机理。根据实验结果对色谱柱模拟进行的校准表明，存在第二种更快的Cr（Ⅵ）去除机理，α_（53）= 0.9992。这项研究的结果表明，还原过程中Cr同位素分馏的解释可能很复杂，特别是在存在多种去除机理的情况下。 Cr同位素分馏的反应迁移模型可以提供污染物去除机理的定量评估，从而改善Cr同位素测量作为跟踪地下水中Cr（Ⅵ）迁移和衰减的工具的应用。

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  • 来源
    《Environmental Science & Technology》 |2012年第24期|13311-13316|共6页
  • 作者

    Julia H. Jamieson-Hanes; Richard T. Amos; David W. Blowes;

  • 作者单位

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, N2L 3G1, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, N2L 3G1, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, N2L 3G1, Canada;

  • 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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  • 正文语种 eng
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