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Abstract A mixture of 2-hydroxy-2-methylpropanoic acid (HIBA) and glycolic acid, with 1-octanesulfonate (OS) as hydrophobic ion proved to be successful for the separation of rare-earth elements (REE). If the ratio of HIBA and glycolic acid is suitably adjusted, it is possible to separate Y from Dy. The resolution of Y and Dy was further improved by controlling the concentration of HIBA and glycolic...