[en] The selective transport of yttrium (III) in the presence of iron (III) through a supported liquid membrane (SLM) has been performed by employing di(2-ethylhexyl)phosphoric acid (DEHPA) as a mobile carrier. Yttrium was preferentially transported across the SLM from the feed solution into the product solution of 1 M H₂SO₄. The transport of iron(III) was suppressed in the presence of complexing agents in the feed solution, and the separation of yttrium(III) from iron(III) was sufficiently enhanced by the addition of phosphoric acid or EDTA. (author)