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首页> 外文期刊>Environmental Science & Technology >Speciation of Uranium in Fernald Soils by Molecular Spectroscopic Methods: Characterization of Untreated Soils
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Speciation of Uranium in Fernald Soils by Molecular Spectroscopic Methods: Characterization of Untreated Soils

机译：蕨类土壤中铀的分子光谱分析：未处理土壤的表征

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摘要

A combination of X-ray absorption, optical luminescence, and Raman vibrational spectroscopies along with ancillary techniques such as energy dispersive scanning electron microscopy and powder X-ray diffraction have been used to determine the chemical form of uranium in contaminated soils from the United States Department of Energy's (DOE) former uranium production facility located at Fernald, OH (30 km NW of Cincinnati). The analyses described here have been carried out on soil samples prior to the application of various decontamination technologies under development within the DOE's Uranium in Soils Integrated Demonstration Project. X-ray absorption studies have shown that ～75-95% of the uranium in bulk samples from the site are in the hexavalent oxidation state. Because of the variety of source terms having several initial oxidation states, this consistency in oxidation state indicates that weathering has had an important role in determining the chemical form of the uranium in the soil. The application of complementary spectroscopic techniques has enabled us to identify specific chemical forms of much of this uranium, namely, autunite-like and schoepite-like phases. Additional uranium minerals were also noted, and their photodecomposition and spatial correlation with source term suggest that they may be uranium species complexed by photochemically degradable organic ligands.
机译：X射线吸收，光学发光和拉曼振动光谱法与诸如能量色散扫描电子显微镜和粉末X射线衍射等辅助技术的结合已被用于确定美国部污染土壤中铀的化学形式能源公司（DOE）的前铀生产设施位于俄亥俄州的Fernald（辛辛那提市西北30公里）。在DOE的“土壤中铀综合示范项目”中正在开发的各种去污技术应用之前，已对土壤样品进行了本文所述的分析。 X射线吸收研究表明，从现场采集的大批样品中约有75-95％的铀处于六价氧化态。由于具有多个初始氧化态的各种来源术语的存在，氧化态的这种一致性表明，风化对确定土壤中铀的化学形式具有重要作用。互补光谱技术的应用使我们能够鉴定出许多这种铀的特定化学形式，即类似金铁矿和类似闪锌矿的相。还指出了其他铀矿物质，它们的光分解和与来源术语的空间相关性表明，它们可能是被光化学降解的有机配体络合的铀物种。

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