Modeling of radionuclides in natural fluids:: synthesis and characterization of the Na4(UO2)2(OH)4(C2O4)2 complex

被引：9
|
作者：
Curini, R
Tentolini, U
Materazzi, S
Vasca, E
Caruso, T
Fontanella, C
Palladino, G
机构：
[1] Univ Roma La Sapienza, Dept Chem, I-00185 Rome, Italy
[2] Univ Salerno, Dept Chem, I-84081 Baronissi, Salerno, Italy
来源：
THERMOCHIMICA ACTA | 2002年 / 387卷 / 01期
关键词：
uranyl; oxalate; complexes; coupled TG-FTIR; EGA; potentiometry;
D O I：
10.1016/S0040-6031(01)00823-1
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The coordination chemistry of dioxouranium(VI) with organic ligands may represent an useful model to describe the migration of radionuclides in natural fluids. A new dioxouranium(VI) ternary complex of formula Na-4(UO2)(2)(OH)(4)(C2O4)(2) was precipitated at pH congruent to 8. It was characterized by elemental analysis, ICP and IR spectroscopy, thermogravimetry (TG) and coupled TG-IR evolved gas analysis. Potentiometric measurements in the solution suggest that the equilibrium shifts from the prevalence of the (UO2)(2)(OH)(2)(C2O4)(4)(6-) complex to the [(UO2)(2)(OH)(4)(C2O4)(2)](4-) complex before the formation of a solid phase. (C) 2002 Elsevier Science B.V. All rights reserved.
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页码：17 / 21
页数：5
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