物理化学学报 >> 2015, Vol. 31 >> Issue (Suppl): 45-48.doi: 10.3866/PKU.WHXB2014Ac05

研究论文 上一篇    下一篇

西南某低放废物库场址地下水中铀的形态模拟

徐真1, 陆春海1,2, 陈敏3, 陈文凯4, 黄硕1, 张琪1   

  1. 1 成都理工大学地学核技术四川省重点实验室, 成都610059;
    2 东华理工大学放射性地质与勘探技术国防重点学科实验室, 南昌330013;
    3 西南科技大学国防科技学院, 四川绵阳621010;
    4 福州大学化学系, 福州350116
  • 发布日期:2015-05-20
  • 通讯作者: 陆春海 E-mail:luchhi@126.com
  • 基金资助:

    国家自然科学基金(41273031), 四川省教育厅重点科研项目(13ZA0067), 贵州省教育厅科技项目(2011010), 成都理工大学科研启动项目(KR1115), 核废物与环境安全国防重点学科实验室开放基金(10zxnk01)和放射性地质与勘探技术国防重点学科实验室开放基金(2011RGET022)资助

Simulation of Uranium Formed in Groundwater of a Low-Level Radioactive Waste Repository Site in Southwest China

XU Zhen1, LU Chun-Hai1,2, CHEN Min3, CHEN Wen-Kai4, HUANG Shuo1, ZHANG Qi1   

  1. 1 Sichuan Key Laboratory of Applied Nuclear Techniques in Geosciences, Chengdu University of Technology, Chengdu 610059, P. R. China;
    2 Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Nanchang 330013, P. R. China;
    3 School of National Defense Science and Technology, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, P. R. China;
    4 Department of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China
  • Published:2015-05-20
  • Contact: LU Chun-Hai E-mail:luchhi@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (41273031), Sichuan Provincial Department of Education Key Research, China (13ZA0067), Guizhou Province Department of Education Projects, China (2011010), Chengdu University of Technology Research Started Project, China (KR1115), NuclearWaste and Environmental Safety Defense Key Laboratory Open Fund, China (10zxnk01), and Radioactive Geology and Exploration Technology Defense Key Laboratory Open Foundation, China (2011RGET022).

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摘要：

根据西南某极低放废物场址地下水的化学组分, 运用PHREEQC软件研究了铀的化学形态, 并讨论了pH、温度和pE (平衡状态下的电子活度)等条件对铀的化学形态的影响及变化规律. 研究结果表明: 当pH=7.6,温度T=12.2 ℃, pE=4时, 该场址地下水中的铀主要呈现VI 价, 以[UO2(CO3)2]2-, [UO2(CO3)3]4-, UO2CO3形式存在; 温度和pH值对铀化学形态分布影响较大, 而pE对其化学形态分布影响较小. 因而, 废物填埋和场址选择需重点考虑场址地下水的温度和pH.

关键词: 铀, 化学形态, PHREEQC, 地下水, 模拟

Abstract:

PHREEQC software was used to study the chemical form of uranium based on the chemical composition of groundwater from a low-level radioactive waste repository located in southwest China. The effects of pH, temperature, and pE (the equilibrium state of electronic activity) on the distribution in uranium chemical form were studied. The results show that uranium presents in the VI chemical valence and [UO2(CO3)2]2-, [UO2(CO3)3]4-, and UO2CO3 forms when pH=7.6, T=12.2 ℃, and pE=4 in groundwater. Temperature and pH strongly impact the distribution of the uranium chemical form. However, pE has little effect on the chemical form distribution. Therefore, pH and groundwater temperature should be taken key considerations during the selection of waste landfill sites.

Key words: Uranium, Chemical form, PHREEQC, Groundwater, Simulation