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Natural attenuation of dissolved uranium within a small stream of central Japan

机译：日本中部一小溪中溶解铀的自然衰减

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摘要

In this study, we investigated the natural attenuation of the uranium (U) load in the surface water within a humid forest in Japan. Surface water and sediments that had accumulated behind dams in the area were investigated in terms of their mineralogy and chemistry. The chemistry of the surface water was analyzed by field measurements of pH, dissolved oxygen (DO) concentration, and electrical conductivity (EC), as well as laboratory analyses via inductively coupled plasma mass spectrometry and ion chromatography. We determined U levels in the surface water; the distribution of U in phases within the sediment was estimated using a sequential extraction procedure. The results of this investigation indicate that U, which within the study area is derived from pegmatites at a mine, is attenuated by uptake onto the surface of organic material and uptake by amorphous material that forms over time within the dammed sediments. The U concentration within the sediment was as great as 8 mg kg?1, whereas the downstream U concentrations and loads in surface water decreased from 1.69 μg l?1 and 11.0 mg min?1 to 0.115 μg l?1 and 2.31 mg min?1, respectively.
机译：在这项研究中，我们研究了日本潮湿森林中地表水中铀（U）负荷的自然衰减。用矿物学和化学方法研究了该地区大坝后面积累的地表水和沉积物。通过现场测量pH值，溶解氧（DO）浓度和电导率（EC）以及通过电感耦合等离子体质谱法和离子色谱法进行的实验室分析来分析地表水的化学性质。我们确定了地表水中的U含量；沉积物中各相中U的分布采用顺序萃取法估算。这项研究的结果表明，研究区内的铀是从矿山的伟晶岩中提取出来的，由于被有机物表面吸收以及被沉积在沉积物中的随时间推移形成的无定形物质所吸收，铀被衰减。沉积物中的铀浓度高达8 mg kg？1 ，而地表水中的下游U浓度和负荷从1.69μgl？1 和11.0 mg min？1 分别为0.115μgl？1 和2.31 mg min？1 。

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  • 来源
    《Limnology》 |2007年第2期|143-153|共11页
  • 作者

    Mitsuo Manaka; Yoji Seki; Koichi Okuzawa; Hikari Kamioka; Yoshio Watanabe;

  • 作者单位

    Geological Survey of Japan AIST Central 7 1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan;

    Geological Survey of Japan AIST Central 7 1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan;

    Geological Survey of Japan AIST Central 7 1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan;

    Geological Survey of Japan AIST Central 7 1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan;

    Geological Survey of Japan AIST Central 7 1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan;

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  • 正文语种 eng
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  • 关键词

    Natural attenuation; Uranium; Sediment; Stream water;

    机译：自然衰减铀沉积物流水;

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