高级检索

Np在Np-水-膨润土平衡体系中的形态及价态分布

Speciation and Valence of Np in Balanced System of Np-groundwater-bentonite

    摘要
  • 摘要: 采用批式法和溶剂萃取法，研究了Np在Np-水-膨润土平衡体系中的形态及价态分布以及pH值对形态及价态分布的影响。结果表明：在Np-水-膨润土平衡体系中，水相中的Np全部为Np(Ⅴ)，固相中的Np为Np（Ⅳ）、Np(Ⅴ)；pH=8~9时，随着pH值的升高，固相中Np的比例升高，pH＞9时，固相中Np的比例降低；随着CO2-3浓度的升高，固相中Np的比例降低。PHREEQCI计算结果表明：pH＜9时，Np在水相中的主要形态为NpO+2，pH＞9时NpO2OH逐渐成为Np在水相中的主要形态；在高CO2-3浓度条件下，NpO2（CO3）3-2、NpO2（CO3）5-3是Np在水相中的主要形态；pH值对Np在水相和固相中的价态分布无影响。

     

    Abstract: The speciation and valence distributions and effect of pH on the speciation and valence distributions of Np in the balanced system of Np-groundwater-bentonite were studied by batch experiments and solvent extraction methods. The results indicate that the valence of Np in groundwater is penta-valent state, and tetra- and penta-valent states were obtained on bentonite. With the increase of pH, the percentage of Np(Ⅴ) in bentonite increases at first and then decreases at pH>9. With the increase of CO2-3, the percentage of Np(Ⅴ) in bentonite decreases. The calculation results of PHREEQCI show that NpO+2 is the main speciation of Np at pH<9, and NpO2OH at pH>9. NpO2(CO3)3-2 and NpO2(CO3)5-3 are the main speciations of Np at high concentration CO2-3 solution. The valence of Np is not affected by pH.

     

    • HTML全文
    • 参考文献(13)
    • 相关文章
    • 施引文献
  • 资源附件(0)

/

返回文章
返回