Uranium Dissolution and Geochemical Modeling in Anoxic and Oxic Solutions
Uranium Dissolution and Geochemical Modeling in Anoxic and Oxic Solutions
复制标题
缺氧和含氧溶液中的铀溶解和地球化学模拟
DOI：
10.1557/adv.2017.58
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发表时间：
2017
期刊：
影响因子：
0.8
通讯作者：
Cory L. Trivelpiece
中科院分区：
文献类型：
--
作者：
C. Jantzen;Cory L. Trivelpiece
高放废物（HLW）玻璃将被储存在世界各地的深层地质储存库中。一些潜在的处置库地质具有氧化性地下水，而另一些具有还原性或缺氧性地下水。地下水氧化电位的差异，表示为地下水Eh，这对玻璃中铁和铀等多价物质的释放有着深远的影响。在缺氧和好氧条件下，在Ar手套箱中于90°C下进行掺杂有铀的单片玻璃样品（ASTM C1220）的静态浸出测试。在去离子水和在低Eh下预平衡的模拟玄武岩地下水中进行测试。地球化学模拟的测量Eh-pH值条件下的好氧和缺氧实验，使用地球化学家的EHMS软件，表明不同的胶体物种控制释放的铀物种在好氧和缺氧条件下。
High Level Waste (HLW) glasses are to be stored in deep geologic repositories around the world. Some potential repository geologies have oxidizing groundwaters while some have reducing or anoxic groundwaters. The differences in the oxidizing potential of the groundwater, expressed as groundwater Eh, which has a profound impact on the release of multivalent species such as iron and uranium from the glass. Static leach testing of monolithic glass samples (ASTM C1220) doped with uranium were performed at 90°C in an Ar glovebox under anoxic and oxic conditions. Tests were performed in both deionized water and in simulated basaltic groundwater that was pre-equilibrated at low Eh. Geochemical modeling of the measured Eh-pH conditions from the oxic and anoxic experiments using Geochemist’s Workbench software, suggested that different colloidal species control the release of uranium species under oxic and anoxic conditions.