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首页> 外文期刊>Environmental Science & Technology >Long-Term Selective Retention of Natural Cs and Rb by Highly Weathered Coastal Plain Soils
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Long-Term Selective Retention of Natural Cs and Rb by Highly Weathered Coastal Plain Soils

机译：长期风化的沿海平原土壤对天然Cs和Rb的长期选择性保留

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摘要

Naturally occurring Cs and Rb are distinctly more abundant relative to K in the highly weathered upland soils of the Savannah River Site, South Carolina, than in average rock of Earth's upper continental crust (UCC), by factors of 10 and 4, respectively. Naturally occurring Cs has been selectively retained during soil evolution, and Rb to a lesser extent, while K has been leached away. In acid extracts of the soils, the Cs/K ratio is about 50 times and the Rb/K ratio about 15 times the corresponding ratios for the UCC, indicating that relatively large amounts of natural Cs and Rb have been sequestered in soil microenviron- ments that are highly selective for these elements relative to K. Cation exchange favoring Cs and Rb ions, and subsequent fixation of the ions, at sites in interlayer wedge zones within hydroxy-interlayered vermiculite particles may account for the observations. The amounts of stable Cs retained and the inferred duration of the soil evolution, many thousands of years, provide new insights regarding long-term stewardship of radiocesium in waste repositories and contaminated environments. Study of natural Cs in soil adds a long-term perspective on Cs transport in soils not available from studies of radiocesium.
机译：在南卡罗来纳州萨凡纳河站点的高度风化的旱地土壤中，天然存在的Cs和Rb相对于K的含量要比地球上地壳（UCC）的平均岩石中的含量分别高10倍和4倍。天然存在的Cs在土壤演化过程中被选择性保留，Rb的保留程度较小，而K被浸出。在土壤的酸性提取物中，Cs / K比约为UCC对应比的50倍，Rb / K比约为UCC对应比的15倍，表明土壤微环境中螯合了相对大量的天然Cs和Rb阳离子交换有利于Cs和Rb离子，以及随后将离子固定在羟基夹层ver石颗粒内层间楔形区中的位置，这可能解释了这些现象。保留的稳定Cs的数量和推断的土壤演变持续了数千年，这为废物处置库和受污染环境中放射性铯的长期管理提供了新的见识。对土壤中天然Cs的研究为放射性铯研究中无法获得的Cs在土壤中的迁移提供了长远的眼光。

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  • 来源
    《Environmental Science & Technology》 |2012年第7期|p.3837-3843|共7页
  • 作者

    J. M. Wampler; Eirik J. Krogstad; W. Crawford Elliott; Bernd Kahn; Daniel I. Kaplan;

  • 作者单位

    Department of Geosciences, Georgia State University, Atlanta, Georgia 30302-4105, United States;

    Department of Geosciences, Georgia State University, Atlanta, Georgia 30302-4105, United States;

    Department of Geosciences, Georgia State University, Atlanta, Georgia 30302-4105, United States;

    Environmental Radiation Center, Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, Georgia 30332-0841,United States;

    Savannah River National Laboratory, Aiken, South Carolina 29808, 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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