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首页> 外文期刊>Environmental Science & Technology >Neptunium(Ⅴ) Partitioning to Uranium(Ⅵ) Oxide and Peroxide Solids
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Neptunium(Ⅴ) Partitioning to Uranium(Ⅵ) Oxide and Peroxide Solids

机译：Ⅴ（Ⅴ）分配为氧化铀（Ⅵ）和过氧化物固体

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Metaschoepite, [(UO_2)_8O_2(OH)_(12)]·10h_2O, and metastudtite, UO_4·H_2O, are alteration phases anticipated in a spent nuclear fuel repository Mowing the moist oxidation of UO_2 on a geologic time scale. Dissolved concentrations and hence potential mobility of other radionuclides in the fuel, such as the neptunyl cation (NpO_2~+), will likely be determined by the extent of their partitioning into these U(Ⅵ) solids. ~(237)Np is of particular interest due to its potential high mobility and long half-life (2.1 x 10~6 years.) In this study, metaschoepite has been precipitated and subsequently transformed to studtite in the presence of dissolved Np. The metaschoepite and studtite solids that formed initially contained <10 and 6500 ppm Np, respectively. Batch dissolution studies of these solids at pH 6 demonstrate release of Np that exceeds congruent dissolution of U from metastudtite; furthermore, the released Np cation remains in solution. Thus, although the Np partitions into the metastudtite solid initially, it is released to solution over time, indicating that metastudtite is not likely to serve as a host solid for Np incorporation or sorption of the neptunyl cation on long time scales.
机译：变硬辉石[（UO_2）_8O_2（OH）_（12）]·10h_2O和变辉石UO_4·H_2O是预期的乏核燃料库中的蚀变相。燃料中其他放射性核素（例如，庚基阳离子（NpO_2〜+））的溶解浓度及其潜在的迁移率很可能取决于它们分配到这些U（Ⅵ）固体中的程度。 〜（237）Np由于其潜在的高迁移率和长的半衰期（2.1 x 10〜6年）而特别受关注。在这项研究中，变钙镁铁矿已经析出，随后在溶解的Np的作用下转变为辉石。最初形成的变菱镁矿和辉云母固形物分别含有小于10和6500 ppm的Np。在pH 6下对这些固体进行的批溶解研究表明，Np的释放量超过了U的均匀分布。此外，释放的Np阳离子保留在溶液中。因此，尽管Np最初分配为偏硅酸盐固体，但是随着时间的流逝它释放到溶液中，这表明偏硅酸盐不太可能在长时间尺度上用作Np掺入或吸附海藻酸钠阳离子的主体固体。

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