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DEVELOPMENT OF NEW TECHNIQUE FOR MECHANISM CLARIFICATION OF INTERACTION BETWEEN URANIUM AND HYDROUS METAL OXIDES AS A ROCK WEATHERING COLLOID UNDER UNDERGROUND WATER CONDITION

地下水条件下岩石风化胶体铀与水合金属氧化物相互作用机理新技术开发

基本信息

批准号：
13680585
负责人：
YAMAZAKI Hiromichi
金额：
$ 2.24万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

In this research, particle induced Xray emission (FIXE) analysis was tested in quantification of the interaction between colloidal particles of hydrous metal oxides and uranium species without disarranging the experimental conditions. The particles and dissolved species of uranium in ng level and metals of sorption matrix were quantitatively determined by PIXE analysis. This means that PIXE can be applied to clarify the sorption mechanism of uranium on colloidal particle of hydrous metal oxides without introducing experimental disturbance. In addition, PIXE combined with the selective enrichment of uranium by chelation in target preparation and the pattern analysis of PIXE spectra were found effective to determine ultra low concentration of 5ppb in solutions containing large amount of elements interfering with X-ray spectrum analysis for uranium. Moreover, uraniumsorption on hydrous oxide colloids of Al and Fe as a rock weathering product was as selective as that of transition metal ions, and uranium and metal elements in colloidal matrix filtrated from aqueous phase can be simultaneously analyzed by PIXE.In the chemical state analysis by PIXE, we examined the energy dispersive measurement of Xray emitted from heavy metals like Cr, Mn and Fe which were bombarded by 70 MeV ^<12>C^<3+> ions and wavelength dispersive measurement of Xray emitted from light elements like AI and Si which were irradiated by 3 MeV pijolons. PIXE using 70 MeV ^<12>C^<3+> irradiation revealed the change in K_β/K_αratio of Xrays in terms of the structural symmetry of chemical compound of heavy metals having 3d orbital electrons. Therefore, this method was confirmed effective as the chemical state analysis technique for heavy metal elements. Though we aimed at the development of wavelength dispersive PIXE device that has the resolution of 2eV in Xray energy range of 0.504-2.16 keV (5 inch phthalic acid rubidium diffraction crystal), the device performance is still at the adjustment stage.

在这项研究中，粒子诱导X射线发射（FIXE）分析进行了测试，在定量的胶体颗粒的水合金属氧化物和铀物种之间的相互作用，而不打乱实验条件。用PIXE分析定量测定了ng级铀的颗粒和溶解态以及吸附基质中的金属。这表明PIXE可用于研究铀在水合金属氧化物胶体颗粒上的吸附机理，且不引入实验干扰。此外，PIXE结合靶制备螯合富集铀和谱图分析，可有效地测定含大量干扰元素的溶液中超低浓度（5 ppb）的铀。在PIXE化学状态分析中，我们考察了Cr、Mn、Fe等重金属在70 MeV ~<12>（3+）C ~（3+）离子轰击下的X射线能谱测量和Al、Si等轻元素在3 MeV π介子辐照下的X射线波长色散测量。用70 MeV^C^3<12>+的PIXE分析表明，X射线的K_β/K_α比值的变化与重金属化合物的3d轨道电子结构对称性有关。因此，确认该方法作为重金属元素的化学状态分析技术是有效的。虽然我们的目标是研制在0.504- 2.16keV X射线能量范围内分辨率为2 eV的波长色散PIXE装置（5英寸邻苯二甲酸铷衍射晶体），但装置性能仍处于调整阶段。