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Fast Separation of Lanthanides by High Pressure Liquid Chromatography

The application of high pressure liquid chromatography to the fast separation of lanthanides was investigated. Two cation exchangers were used as the stationary phase along with α-hydroxyiso butyric acid as mobile phase, as well as di(2-ethylhexyl)orthophosphoric acid adsorbed on silica gel as the stationary and nitric acid as mobile phase. Column performance was studied as a function of temperature and mobile phase velocity by measuring the height equivalent to a theoretical plate for the elution of Sm(III) and Eu(III). Fast separations of seven trivalent lanthanides and yttrium were achieved in 20 min using high efficiency columns and gradient elution.