Cumulative study on solvent extraction of elements by N,N,N′,N′-tetraoctyl-3-oxapentanediamide (TODGA) from nitric acid into n-dodecane
Cumulative study on solvent extraction of elements by N,N,N′,N′-tetraoctyl-3-oxapentanediamide (TODGA) from nitric acid into n-dodecane
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DOI：
10.1016/j.aca.2004.09.023
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发表时间：
2004-12
影响因子：
6.2
通讯作者：
Zhi-Xuan Zhu;Y. Sasaki;Hideya Suzuki;Shin'ichi Suzuki;T. Kimura
中科院分区：
文献类型：
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作者：
Zhi-Xuan Zhu;Y. Sasaki;Hideya Suzuki;Shin'ichi Suzuki;T. Kimura
研究了N，N，N′，N′-四辛基-3-氧代戊二酰胺（TODGA）从硝酸介质中萃取正十二烷中75种元素的行为，并从金属离子的分配比（D）和离子半径两个方面进行了讨论。元素的可萃取性强烈地取决于它们的氧化态。单价和五价离子不可浸提。在二价金属萃取中，Ca（II）（离子半径：100 μ m）显示出最高的D-值，并且D随着离子半径的增加或减小而减小。离子半径分别为87-113和83- 94 μ m的三价和四价离子显示D> 1000，并且确定提取的化学形式为M（TODGA）3（NO3）或M（TODGA）4（NO3）n（n=3或4）。氧化态高于四价的氧鎓离子与TODGA形成复杂的金属络合物，并且在这些萃取反应中缔合的TODGA的数目被证实为最多两个。
The extraction of 75 elements by N,N,N′,N′-tetraoctyl-3-oxapentanediamide (TODGA) from nitric acid to n-dodecane was investigated and discussed concerning distribution ratios (D) of metal ions and their ionic radii. The extractability for elements depends strongly on their oxidation state. Monovalent and pentavalent ions were not extractable. In divalent metal extraction, Ca(II) (ionic radius: 100pm) showed the highest D-value and the D decreased with increase or decrease of the ionic radius. Trivalent and tetravalent ions with ionic radii of 87–113 and 83–94pm, respectively, showed the D over 1000, and the extracted chemical forms were determined to be M(TODGA)3(NO3)nor M(TODGA)4(NO3)n(n=3 or 4). The oxonium ions with higher oxidation states than tetravalent one forms the complicated metal-complex with TODGA, and the number of TODGA associated in those extraction reactions was confirmed to be two at most.