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Evaluation of a Radioiodme Plume Increasing in Concentration at the Savannah River Site

机译：萨凡纳河站点放射性碘羽浓度增加的评估

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摘要

Field and laboratory studies were carried out to understand the cause for steady increases in ~(129)l concentrations emanating from radiological basins located on the Savannah River Site, South Carolina. The basins were closed in 1988 by adding limestone and slag and then capping with a low permeability engineered cover. Groundwater ~(129)I concentrations in a well near the basins in 1993 were 200 pCi L~(-1) and are presently between 400 and 1000 pCi L~(-1). Iodine speciation in the plume contained wide ranges of iodide, iodate, and organo-iodine concentrations. First-order calculations based on a basin sediment desorption study indicate that the modest increase of 0.7 pH units detected in the study site groundwater over the last 17 years since closure of the basins may be sufficient to produce the observed increased groundwater ~(129)l concentrations near the basins. Groundwater monitoring of the plume at the basins has shown that the migration of many of the high risk radionuclides originally present at this complex site has been attenuated. However, ~(129)l continues to leave the source at a rate that may have been exacerbated by the initial remediation efforts. This study underscores the importance of identifying the appropriate in situ stabilization technologies for all source contaminants, especially if their geochemical behaviors differ.
机译：进行了现场和实验室研究，以了解源于南卡罗来纳州萨凡纳河站点放射盆地的〜（129）l浓度稳定增加的原因。 1988年，通过添加石灰石和矿渣，然后用低渗透性工程覆盖层封盖来关闭这些盆地。 1993年流域附近一口井中的地下水〜（129）I浓度为200 pCi L〜（-1），目前在400至1000 pCi L〜（-1）之间。羽流中的碘形态包含广泛的碘化物，碘酸盐和有机碘浓度。基于盆地沉积物解吸研究的一阶计算表明，自从盆地关闭以来，在过去17年中，研究场地地下水中检出的pH值适度增加了0.7个pH单位，可能足以产生观测到的地下水增加量（〜129）l盆地附近的浓度。对盆地羽流的地下水监测表明，原本存在于该复杂地点的许多高风险放射性核素的迁移已被减弱。但是，〜（129）1继续以最初的补救工作可能加剧的速度离开污染源。这项研究强调了为所有源污染物确定合适的原位稳定技术的重要性，尤其是在其地球化学行为不同的情况下。

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  • 来源
    《Environmental Science & Technology》 |2011年第2期|p.489-495|共7页
  • 作者

    DANIEL I. KAPLAN; KIMBERLY A. ROBERTS; KATHY A. SCHWEHR; MICHAEL S. LILLEY; ROBIN BRINKMEYER; MILES E. DENHAM; DAVID DIPRETE; HSIU-PING LI; BRIAN A. POWELL; CHEN XU; CHRIS M. YEAGER; SAIJIN ZHANG; PETER H. SANTSCHI;

  • 作者单位

    Savannah River National Laboratory, Aiken, South Carolina 29808, United States;

    rnSavannah River National Laboratory, Aiken, South Carolina 29808, United States;

    rnLaboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas ASM University, Building 3029, Galveston, Texas 77551, United States;

    rnDepartment of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina 29625, United States;

    rnDepartment of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina 29625, United States;

    rnSavannah River National Laboratory, Aiken, South Carolina 29808, United States;

    rnSavannah River National Laboratory, Aiken, South Carolina 29808, United States;

    rnLaboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas ASM University, Building 3029, Galveston, Texas 77551, United States;

    rnDepartment of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina 29625, United States;

    rnLaboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas ASM University, Building 3029, Galveston, Texas 77551, United States;

    rnSavannah River National Laboratory, Aiken, South Carolina 29808, United States;

    rnLaboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas ASM University, Building 3029, Galveston, Texas 77551, United States;

    rnLaboratory for Environmental and Oceanographic Research, Department of Marine Sciences, Texas ASM University, Building 3029, Galveston, Texas 77551, United States;

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