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首页> 外文期刊>Environmental Science & Technology >Reactivity of Uranium and Ferrous Iron with Natural Iron Oxyhydroxides
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Reactivity of Uranium and Ferrous Iron with Natural Iron Oxyhydroxides

机译：铀和亚铁与天然氢氧化铁的反应活性

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摘要

Determining key reaction pathways involving uranium and iron oxyhydroxides under oxic and anoxic conditions is essential for understanding uranium mobility as well as other iron oxyhydroxide mediated processes, particularly near redox boundaries where redox conditions change rapidly in time and space. Here we examine the reactivity of a ferrihydrite-rich sediment from a surface seep adjacent to a redox boundary at the Rifle, Colorado field site. Iron(Ⅱ)-sediment incubation experiments indicate that the natural ferrihydrite fraction of the sediment is not susceptible to reductive transformation under conditions that trigger significant mineralogical transformations of synthetic ferrihydrite. No measurable Fe(Ⅱ)- promoted transformation was observed when the Rifle sediment was exposed to 30 mM Fe(Ⅱ) for up to 2 weeks. Incubation of the Rifle sediment with 3 mM Fe(Ⅱ) and 0.2 mM U(Ⅵ) for 15 days shows no measurable Incorporation of U(Ⅵ) into the mineral structure or reduction of U(Ⅵ) to U(Ⅳ). Results indicate a significantly decreased reactivity of naturally occurring Fe oxyhydroxides as compared to synthetic minerals, likely due to the association of impurities (e.g., Si, organic matter), with implications for the mobility and bioavailability of uranium and other associated species in field environments.
机译：确定在有氧和无氧条件下涉及铀和羟基氧化铁的关键反应途径对于理解铀迁移率以及其他羟基氧化铁介导的过程（尤其是在氧化还原边界随时间和空间快速变化的氧化还原边界附近）至关重要。在这里，我们检查了科罗拉多州步枪场现场与氧化还原边界相邻的地表渗漏中富含铁水合物的沉积物的反应性。铁（Ⅱ）沉积物的温育实验表明，沉积物的天然铁水合物级分在引发合成铁水合物的显着矿物学转变的条件下不易发生还原转化。当步枪沉淀物暴露于30 mM Fe（Ⅱ）达2周时，未观察到可测量的Fe（Ⅱ）促进的转变。将步枪沉积物与3 mM Fe（Ⅱ）和0.2 mM U（Ⅵ）一起温育15天，无法测量到将U（Ⅵ）掺入矿物结构中或将U（Ⅵ）还原为U（Ⅳ）。结果表明，与合成矿物相比，天然存在的羟基氧化铁的反应活性显着降低，这可能是由于杂质（例如，硅，有机物）的结合，这对铀和其他相关物种在田间环境中的迁移率和生物利用度有影响。

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  • 来源
    《Environmental Science & Technology》 |2015年第17期|10357-10365|共9页
  • 作者

    Brandy D. Stewart; A. Cristina Cismasu; Kenneth H. Williams; Brent M. Peyton; Peter S. Nico;

  • 作者单位

    Chemical and Biological Engineering, Montana State University, Bozeman, Montana 59717, United States;

    Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, California 94720, United States;

    Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, California 94720, United States;

    Chemical and Biological Engineering, Montana State University, Bozeman, Montana 59717, United States;

    Lawrence Berkeley National Laboratory, Earth Sciences Division, Berkeley, California 94720, 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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  • 正文语种 eng
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