Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (3): 030301 doi: 10.13538/j.1001-8042/nst.2013.03.010

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

Interaction between uranium and humic acid (II): complexation, precipitation and migration behavior of U(VI) in the presence of humic substances

LIAO Jiali1  WEN Wei1,2  LI Bing1  YANG Yuanyou1  ZHANG Dong2  KANG Houjun YANG Yong2  JIN Jiannan1  LIU Ning1   

  1. 1Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
    2Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900, China
  • Received:2010-09-17
  • Contact: LIU Ning E-mail: nliu720@scu.edu.cn
  • Supported by:

    Supported by China National Natural Science Foundation (Nos.21071102 and 91126013), Joint Funds of China National Natural Science Foundation and China Academy of Engineering Physics (No. 10476015) and National Fund of China for Fostering Talents in Basic Science (No.J1210004)

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LIAO Jiali, WEN Wei, LI Bing, YANG Yuanyou, ZHANG Dong, KANG Houjun, YANG Yong, JIN Jiannan, LIU Ning . Interaction between uranium and humic acid (II): complexation, precipitation and migration behavior of U(VI) in the presence of humic substances.Nuclear Science and Techniques, 2013, 24(3): 030301     doi: 10.13538/j.1001-8042/nst.2013.03.010

Abstract:

The complexation, precipitation, and migration behavior of uranium in the presence of humic acid (HA) or fulvic acid (FA) were investigated by cation exchange, ultrafiltration and dynamic experiment, respectively. The results showed that (i) complex equilibrium between the uranium and humic substances was achieved at approximately 72 h, (ii) the coordination number varied from 1:1 to 1:2 ( U(VI) : humic acid) as pH increased from 3 to 6; and (iii) , while the complex stability constant decreased when temperature increased, but increased with pH value. We found that the precipitation of uranyl could only be observed in presence of HA, and the precipitation was influenced by conditions, such as pH, uranium concentration, temperature, and the HA concentration. The maximum precipitation proportion up to 60% could be achieved in the condition of 40 mg/L HA solution at pH 6. We further observed that the migration behavior of uranium in soil in the presence of humic acid (HA) or fulvic acid (FA) was different from that in the presence of inorganic colloid, and the effect of humic substances (HS) was limited.

 

Key words: Interaction, Uranium, Humic acid, Complexation, Migration, Precipitation, Soil