高放废物处置库野马泉预选地段地下水铀存在形式及迁移特征

甘肃北山野马泉地区是我国高放废物处置库预选场址之一。本文以该预选场址为例，在地下水铀、钍含量及其同位素比值测试、分析基础上，计算了铀存在形式。结果表明，地下水中的铀主要以U(OH)₄(aq)形式存在。探讨了铀的迁移特征，认为在当地的地质、水文地质等环境条件下，铀的迁移能力很低。

Uranium Occurrence Species and Its Migration Features of Groundwater in Yemaquan Preselected Section for China's HLW Disposal Repository

Yemaquan section in Beishan area, Gansu Province, is one of the preselected sections of disposal repository for high level radioactive waste (HLW) in our country. Taking this section as an example, based on the measurement and analysis of ground-water U, Th content and isotopic ratio, the uranium occurrence species was calculated. The results show that the uranium occurrence species in groundwater in the area is mainly U(OH)₄(aq). The uranium migration feature was explored in this paper. The evidences show that the migration ability of uranium is very limited in the geological, hydrogeological environmental conditions of the section.