Korkisch J, Orlandini K A
Chemistry Division, Argonne National Laboratory, Argonne, Illinois, U.S.A.
Talanta. 1969 Jan;16(1):45-9. doi: 10.1016/0039-9140(69)80239-0.
Hafnium and zirconium are not retained on the strongly acidic cation-exchange resin Dowex 50 from a mixture consisting of methanol and 12M nitric acid (19:1) which is 0.1M in trioctylphosphine oxide. On the other hand most other elements investigated are strongly adsorbed on the resin from this medium so that they are readily separated from hafnium and zirconium. These elements include titanium, rare earths, alkali metals, alkaline earth metals, iron, cobalt, manganese and zinc. This separation technique has been found to be suitable for the separation of tracer and milligram amounts of hafnium and zirconium from accompanying metal ions. If in place of methanol other organic solvents such as acetone, tetrahydrofuran and methyl glycol are used the selectivity of the separation of zirconium and hafnium from the other elements is decreased. The same effect is observed when hydrochloric acid is used in the mixtures instead of nitric acid.
在由甲醇和12M硝酸（19:1）组成且含有0.1M三辛基氧化膦的混合物中，铪和锆不会保留在强酸性阳离子交换树脂Dowex 50上。另一方面，所研究的大多数其他元素会被这种介质强烈吸附在树脂上，从而很容易与铪和锆分离。这些元素包括钛、稀土元素、碱金属、碱土金属、铁、钴、锰和锌。已发现这种分离技术适用于从伴生金属离子中分离痕量和毫克量的铪和锆。如果用其他有机溶剂如丙酮、四氢呋喃和甲基乙二醇代替甲醇，则锆和铪与其他元素的分离选择性会降低。当混合物中使用盐酸代替硝酸时，也会观察到同样的效果。
