Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (Suppl): 45-48.doi: 10.3866/PKU.WHXB2014Ac05

• ARTICLE • Previous Articles     Next Articles

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).

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

MSC2000: 

  • O642