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首页> 外文会议>Safety of radioactive waste management >STAGNANT WATER VERSUS FLOWING WATER: THE INFLUENCE IN U, Th, AND RARE EARTH ELEMENTS (REE) CONCENTRATIONS
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STAGNANT WATER VERSUS FLOWING WATER: THE INFLUENCE IN U, Th, AND RARE EARTH ELEMENTS (REE) CONCENTRATIONS

机译：呆滞水与流动水：U，Th和稀土元素（REE）浓度的影响

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摘要

The mobility of REE, U, and Th in aqueous solutions is relevant environmentally, and especially, is an important issue in the performance assessment of radionuclide behaviour in the near-field of spent fuel repository. Uranium, thorium and REE analyses of two water samples were performed in order to estimate the influence of stagnant water versus flowing water in the leachability of these elements. The first sample (FGW) is groundwater from a water-carrying fracture in granite pegmatite at a depth of 70 m. The surface of this fracture was covered by smectite (main mineral component of bentonite). The second sample (SGW) is the same groundwater, which has been in contact with the smectite during 10 days. Of the REE in flowing groundwater, only La is further sorbed in the smectite. Surprisingly thorium, which is thought to be a very immobile element, is further released into groundwater.
机译：REE，U和Th在水溶液中的迁移率与环境有关，尤其是在乏燃料库附近场中放射性核素行为性能评估中的重要问题。进行了两个水样的铀，和稀土元素分析，以评估停滞水与流动水对这些元素浸出率的影响。第一个样品（FGW）是来自花岗岩伟晶岩中水浸裂缝的地下水，深度为70 m。裂缝的表面被蒙脱石（膨润土的主要矿物成分）覆盖。第二个样本（SGW）是相同的地下水，在10天内与绿土接触。在流动的地下水中的稀土元素中，只有La进一步吸附在蒙脱石中。令人惊讶的是，,被认为是非常不可移动的元素，它会进一步释放到地下水中。

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