SEPARATION OF LANTHANIDES AND SOME ASSOCIATED ELEMENTS BY LIQUID-LIQUID-EXTRACTION AND REVERSE PHASE THIN-LAYER CHROMATOGRAPHY USING HIGH-MOLECULAR-WEIGHT AMINE-CITRATE SYSTEM

Primene JM-T has been used to study the extraction of Ce(III), Gd(III) and Yb(III) and other associated elements such as Y(III), Ti(IV), V(IV), Zr(IV), Th(IV) and U(VI) from citric acid medium. Based on distribution data it has been possible to achieve separation of lanthanides from titanium, zirconium, thorium and uranium with high separation factors. The amine-citrate system has also been used to study the reverse-phase TLC behaviour of Ce(III), Gd(III) and Yb(III) and of Y, Ti, V, Zr, Th and U. Binary separations involving lanthanides have also been achieved on amine impregnated layers.