中华医学超声杂志

应用化学 ›› 2011, Vol. 28 ›› Issue (06): 695-698.DOI: 10.3724/SP.J.1095.2011.00388

• 研究论文 • 上一篇    下一篇

Pu(Ⅳ)、Pu(Ⅴ)在不同质地砂土中的分配

于静*,司高华,黄云贵,刘东旭   

  1. (西北核技术研究所 西安 710024)
  • 收稿日期:2010-06-30 修回日期:2010-09-14 出版日期:2011-06-10 发布日期:2011-06-10
  • 通讯作者: 于静，工程师; Tel:0996-2359052; Fax:0996-2359979; E-mail:yujing_19841107@163.com; 研究方向：环境影响评价

Sorption Distribution Coefficient of Pu(Ⅳ) and Pu(Ⅴ) in Sandy Soils

YU Jing*, SI Gaohua, HUANG Yungui, LIU Dongxu   

  1. (Northwest Institute of Nuclear Technique，Xi′an 710024)
  • Received:2010-06-30 Revised:2010-09-14 Published:2011-06-10 Online:2011-06-10

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摘要：

Pu(Ⅲ)、Pu(Ⅳ)、Pu(Ⅴ)和Pu(Ⅵ)在自然水的pH和Eh(氧化还原电势)值范围内能够共存。 在自然环境中主要以Pu(Ⅴ)的PuO2(H2O)+n和Pu(Ⅳ)的Pu(OH)4形式存在。 采用静态法测定了Pu(Ⅳ)和Pu(Ⅴ)在砂土介质中的分配系数Kd，Pu(Ⅳ)和Pu(Ⅴ)在砂土中的分配系数范围分别为5.5×103~4×104 mL/g 和3.2×103～1.1×104 mL/g。 表明在砂土介质中Pu(Ⅳ)的分配系数(Kd)大于Pu(Ⅴ)的，并且分配系数随砂土介质中粘土矿物含量的增加及介质颗粒粒径减小而增大。

关键词: Pu(Ⅳ), Pu(Ⅴ), 砂土, 分配系数

Abstract:

Pu exists in four different oxidation states(Ⅲ, Ⅳ, Ⅴ, Ⅵ) with in the Eh(redox potential) and pH ranges of natural environment. Pu(Ⅳ) in Pu(OH)4 form and Pu(Ⅴ) in PuO2(H2O)+n form are the dominant oxidation states under equilibrium conditions for groundwater compositions. The sorption distribution coefficients(Kd) of Pu(Ⅳ) and Pu(Ⅴ) in the sand soil were studied by batch experiments, Kd of Pu(Ⅳ) is about 5.5×103 mL/g to 4×104 mL/g, Kd of Pu(Ⅴ) is 3.2×103 mL/g to 1.1×104 mL/g. In conclusion, Kd values of Pu(Ⅳ) in the sand soil were larger than those of Pu(Ⅴ). Such distribution coefficients increase with the increase of amount of clay in sand soil and the decrease of particle size.

Key words: Pu(Ⅳ), Pu(Ⅴ), Sandy soil, Distribution coefficient

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