Study of Environmental Chemical Species and Underground Migration Behavior of TRU

TRU的环境化学形态及地下迁移行为研究

• 批准号: 09480100
• 负责人: MORIYAMA Hirotake
• 金额: $ 7.49万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09480100/
• 关键词: high level radioactive waste; geologic disposal; transuranium elements; solubility; hydrolysis; adsorption; 炭酸錯体

In order to know underground migration of transuranium elements (TRU) which is important for the safety assessment of geologic disposal of high level radioactive wastes, their adsorption behavior onto rocks and hydrolysis reactions were investigated in the present study.(1) For the adsorption behavior of radionuclides onto rocks, experiments were performed with some adsorbates(CsィイD1+ィエD1, SrィイD12+ィエD1, BaィイD12+ィエD1, EnィイD13+ィエD1, AmィイD13+ィエD1, etc. )and typical adsorbents (quartz, rganite, etc. )to study the applicability of the electric double layer model to adsorption reactions of TRU. The measured data were well analyzed by the model and the obtained thermodynamic equilibrium constants were discussed from a systematic point of view for predicting the unknown values.(2)For the improvement of thermodynamic data on hydrolysis and complexation of actinide ions, the solubility measurement and the time-resolved laser induced fluorescence measurement were performed of U(VI) in alkaline solutions, and the hydrolysis constant for UoィイD22ィエD2(OH)ィイD32-(/) 4ィエD3was newly determined, and the coordination properties of U(VI) hydrolysis species were discussed.(3)Furthermore, the hydrolysis constants of actinide ions were analyzed by using an improved hard sphere model in which the effective charges of actinide ions were considered. In addition to ordinary electrostatic interactions, non-electrostatic interactions were found to contribute to the stability of the hydrolysis species of these ions.

为了了解超铀元素在地下的迁移对高放废物地质处置的安全性评价具有重要意义，本研究对超铀元素在岩石上的吸附行为和水解反应进行了研究。(1)对于放射性核素在岩石上的吸附行为，用几种吸附剂(CsィイD_1+ィエD_1、锶ィイD_(12)+ィエD_1、BaィイD_(12)+ィエD_1、ENィイD_(13)+ィエD_1、AmィイD_(13)+ィエD_1等)和典型的吸附剂(石英、硅锰矿、Am_ィイD_(13)+ィエD_1等)进行了实验。研究双电层模型对TRU吸附反应的适用性。(2)为了更好地利用热力学数据预测未知值，进行了U(VI)在碱性溶液中的溶解度测定和时间分辨激光诱导荧光测定，重新确定了UOィイD22ィエD2(OH)ィイD32-(/)4ィエD3的水解常数，并讨论了U(VI)水解物的配位性质。在改进的硬球模型中，考虑了鳗离子的有效电荷，分析了鳗离子的水解常数。除了普通的静电相互作用外，还发现非静电相互作用有助于这些离子的水解物的稳定性。

项目成果

A.Kitamura: "Selective Adsorption Behavior of Cesium Ions onto Granite"J. Nuclear Fuel Cycle and Environment. 4. 39-45 (1997)

A.Kitamura：“铯离子在花岗岩上的选择性吸附行为”J。

A.Kitamura: "Sorption Behavior of Am(III) onto Granite" J.Radioanal.Nucl.Chem.(発売予定).

A.Kitamura：“Am(III) 在花岗岩上的吸附行为”J.Radioanal.Nucl.Chem.（计划发布）。

A. Kitamura: "Selective Adsorption Behavior of Cesium Ions onto Granite"J. Nuclear Fuel Cycle and Environment. 4. 39-45 (1997)

A. Kitamura：“铯离子在花岗岩上的选择性吸附行为”J。

A. Kitamura: "Sorption Behavior of Am (III) onto Granite"J. Radioanal. Nucl. Chem. 239. 449-453 (1999)

A. Kitamura：“Am (III) 在花岗岩上的吸附行为”J。

A. Kitamura: "Measurement of Hydrolysis Species of U(VI) by Time-resolved Laser Induced Fluorescence Spectroscopy"Radiochim. Acta. 82. 147-152 (1998)

A. Kitamura：“通过时间分辨激光诱导荧光光谱法测量 U(VI) 的水解物质”Radiochim。