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首页> 外文期刊>Environmental Science & Technology >~(99)Tc(Ⅶ) Retardation, Reduction, and Redox Rate Scaling in Naturally Reduced Sediments
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~(99)Tc(Ⅶ) Retardation, Reduction, and Redox Rate Scaling in Naturally Reduced Sediments

机译：自然减少的沉积物中〜（99）Tc（Ⅶ）延迟，减少和氧化还原速率缩放

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摘要

An experimental and modeling study was conducted to investigate pertechnetate (Tc(Ⅶ)O_4~-) retardation, reduction, and rate scaling in three sediments from Ringold formation at U.S. Department of Energy's Hanford site, where ~(99)Tc is a major contaminant in groundwater. Tc(Ⅶ) was reduced in all the sediments in both batch reactors and diffusion columns, with a faster rate in a sediment containing a higher concentration of HCl-extractable Fe(Ⅱ). Tc(Ⅶ) migration in the diffusion columns was reductively retarded with retardation degrees correlated with Tc(Ⅶ) reduction rates. The reduction rates were faster in the diffusion columns than those in the batch reactors, apparently influenced by the spatial distribution of redox-reactive minerals along transport paths that supplied Tc(Ⅶ). X-ray computed tomography and autoradiography were performed to identify the spatial locations of Tc(Ⅶ) reduction and transport paths in the sediments, and results generally confirmed the newly found behavior of reaction rate changes from batch to column. The results from this study implied that Tc(Ⅶ) migration can be reductively retarded at Hanford site with a retardation degree dependent on reactive Fe(Ⅱ) content and its distribution in sediments. This study also demonstrated that an effective reaction rate may be faster in transport systems than that in well-mind reactors.
机译：进行了一项实验和模型研究，以研究美国能源部汉福德矿场的Ringold地层的三种沉积物中高tech酸盐（Tc（Ⅶ）O_4〜-）的阻滞，还原和速率变化，其中〜（99）Tc是主要污染物在地下水中。间歇反应器和扩散塔中所有沉积物中的Tc（Ⅶ）均降低，其中含有较高浓度的可通过HCl萃取的Fe（Ⅱ）的沉积物中Tc（Ⅶ）降低。 Tc（）在扩散塔中的迁移被还原性减速，其延迟程度与Tc（Ⅶ）的还原速率相关。扩散塔中的还原速率比间歇反应器中的还原速率快，这显然受到氧化还原反应性矿物沿供应Tc（Ⅶ）的传输路径的空间分布的影响。进行了X射线计算机断层扫描和放射自显影，以识别沉积物中Tc（Ⅶ）还原和传输路径的空间位置，结果通常证实了新发现的反应速率随批次变化的行为。这项研究的结果表明，Tc（migration）的迁移可以在汉福德站点被还原性地减速，其减速程度取决于反应性Fe（Ⅱ）的含量及其在沉积物中的分布。这项研究还表明，在运输系统中，有效反应速率可能比在谨慎的反应堆中更快。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13403-13412|共10页
  • 作者

    Yuanyuan Liu; Chongxuan Liu; Ravi K. Kukkadapu; James P. McKinley; John Zachara; Andrew E. Plymale; Micah D. Miller; Tamas Varga; Charles T. Resch;

  • 作者单位

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, 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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