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首页> 外文期刊>Environmental Science & Technology >Iodine-129 and Iodine-127 Speciation in Groundwater at the Hanford Site, U.S.: lodate Incorporation into Calcite
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Iodine-129 and Iodine-127 Speciation in Groundwater at the Hanford Site, U.S.: lodate Incorporation into Calcite

机译：美国汉福德基地地下水中的Iodine-129和Iodine-127形态：将黄铁矿掺入方解石中

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摘要

The geochemical transport and fate of radioiodine depends largely on its chemical speciation that is greatly affected by environmental factors. This study reports, for the first time, the speciation of stable and radioactive iodine in the groundwater from the Hanford Site. Iodate was the dominant species and accounted for up to 84% of the total iodine present The alkaline pH (pH ～ 8) and predominantly oxidizing environment may have prevented reduction of the iodate. In addition, groundwater samples were found to have large amounts of calcite precipitate which were likely formed as a result of CO_2 degassing during removal from the deep subsurface (＞70m depth). Further analyses indicated that between 7 and 40% of the dissolved ~(127)I and ~(129)I that was originally in the groundwater had coprecipitated in the calcite. Iodate was the main species incorporated into calcite and this incorporation process could be impeded by elevating the pH and decreasing ionic strength in groundwater. This study provides critical information for predicting the long-term fate and transport of ~(129)I. Furthermore, the common sampling artifact resulting in the precipitation of calcite by degassing CO_2, had the unintended consequence of providing insight into a potential solution for the in situ remediation of groundwater ~(129)I.
机译：放射性碘的地球化学迁移和命运在很大程度上取决于受环境因素极大影响的化学形态。这项研究首次报告了汉福德遗址地下水中稳定和放射性碘的形态。碘酸盐是主要的物种，占碘总量的84％。碱性pH值（pH〜8）和主要的氧化环境可能阻止了碘酸盐的还原。另外，发现地下水样品中有大量方解石沉淀，这很可能是由于从深地下（> 70m深度）去除过程中CO_2脱气而形成的。进一步的分析表明，最初在地下水中溶解的〜（127）I和〜（129）I中有7％至40％在方解石中共沉淀。碘酸盐是方解石中的主要掺入物，该掺入过程可通过提高pH值和降低地下水中的离子强度来阻止。这项研究为预测​​〜（129）I的长期命运和运输提供了关键信息。此外，常见的采样伪像通过将CO_2脱气而导致方解石沉淀，从而产生了意想不到的结果，即可以为地下水〜（129）I的原位修复提供潜在的解决方案。

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  • 来源
    《Environmental Science & Technology》 |2013年第17期|9635-9642|共8页
  • 作者

    Saijin Zhang; Chen Xu; Danielle Creeley; Yi-Fang Ho; Hsiu-Ping Li; Russell Grandbois; Kathleen A. Schwehr; Daniel I. Kaplan; Chris M. Yeager; Dawn Wellman; Peter H. Santschi;

  • 作者单位

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, United States;

    Savannah River National Laboratory (SRNL), Aiken, South Carolina 29802 , United States;

    Los Alamos National Laboratory (LANL), Los Alamos, New Mexico 87544, United States;

    Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States;

    Department of Marine Science, Texas A&M University at Galveston, Texas 77554, 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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