Dietz Mark L, Stepinski Dominique C
Chemical Sciences & Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA.
Talanta. 2008 Apr 15;75(2):598-603. doi: 10.1016/j.talanta.2007.11.051. Epub 2007 Nov 28.
The mode of partitioning of uranyl ion between nitrate-containing aqueous phases and various N,N'-dialkylimidazolium-based room-temperature ionic liquids (RTILs) in the presence of tri-n-butyl phosphate (TBP) is shown to change from an ion-exchange process to one involving extraction of a neutral uranyl-TBP-nitrato complex as the aqueous nitrate concentration is increased. Increasing the hydrophobicity of the RTIL cation eventually leads to nitrato complex extraction as the predominant mode of partitioning, regardless of nitrate concentration.
结果表明，在磷酸三丁酯（TBP）存在的情况下，硝酸根离子在含硝酸盐的水相和各种N，N'-二烷基咪唑基室温离子液体（RTILs）之间的分配模式会随着水相硝酸盐浓度的增加而从离子交换过程转变为涉及中性铀酰-TBP-硝酸根络合物萃取的过程。无论硝酸盐浓度如何，增加RTIL阳离子的疏水性最终都会导致硝酸根络合物萃取成为主要的分配模式。
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