Separation of samarium and europium by solvent extraction with an undiluted quaternary ammonium ionic liquid: towards high-purity medical samarium-153.

7 Sm 3+ Aq + 3NO 3 − Aq + 2[A336][NO 3 ] org ⇌ [A336] 2 [Sm(NO 3 ) 5 ] org Larsson and Binnemans already pointed out that all trivalent lanthanides (Ln 3+ ) show a similar extraction behavior with quaternary ammonium ionic liquids, with a decreasing trend in extraction efficiency across the lanthanide series. 50 Thus, the slightly lower extraction efficiency of Eu 3+ compared to Sm 3+ is in full agreement with these findings ( Fig. 3b and 4b ).

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