Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (7): 70301-070301.doi: 10.11889/j.0253-3219.2018.hjs.41.070301

• NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles     Next Articles

Computational simulation of the speciation distribution of uranium in Beishan groundwater and the sorption of uranium on two different materials

ZHOU Wanqiang1, JIANG Jingcheng1,2, HE Jiangang1, WANG Xiangyun1, DU Liang3, WANG Xiaoli3, TAN Zhaoyi3, LIU Chunli1   

  1. 1. Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
    2. Ministry of Environmental Protection Solid Waste and Chemicals Management Center, Beijing 100029, China;
    3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2017-03-01 Revised:2017-09-16 Online:2018-07-10 Published:2018-07-07
  • Supported by:
    Supported by National Natural Science Foundation of China (No.U1530112, No.11475008, No.11075006, No.91026010), the State Administration of Science Technology and Industry for National Defence (No.2007-840, No.2012-851)

Abstract: [Background] The disposal of high-level radioactive wastes is critical for sustainable development of nuclear energy. And the adsorption, diffusion and migration behaviors of radionuclides in the environment depend on the chemical species in the system. [Purpose] The paper aims to understand the speciation distribution of uranium and adsorption behavior on quartz and hydrous ferric oxide. [Methods] The speciation distribution and sorption of uranium are calculated by chemical speciation analysis software CHEMSPEC, which is developed by Peking University Nuclear Environmental Group. [Results and Conclusions] The calculation results indicate that uranium exists as UO2(CO3)4-3 and UO2(CO3)2-2 in the Beishan groundwater. And under acidic conditions, uranium mainly exists as U(OH)4(aq). While in neutral or weak alkaline conditions, the main species are UO2(CO3)2-2 and UO2(CO3)4-3. When the solution is in strong alkaline conditions, most of uranium exists as UO2(OH)-3. And U(IV) is stable in the redox condition, while U(VI) is stable in the oxide condition. The concentration of different ions also has influence on the speciation distribution of uranium, and in the order of HCO-3 > F- > SO2-4 > Cl-. With the increasing number of pH, the sorption extent of U(VI) on quartz is lager. And the maximum adsorption is at pH=4.3. When it comes to U(VI) sorption on hydrous iron oxide, the greatest sorption is at pH=5.7~8.2.

Key words: Uranium, CHEMSPEC, Speciation distribution, Sorption

CLC Number: 

  • TL942.1