Three corn. phosphonium ionic liqs. (trihexyl(tetradecyl)phosphonium chloride and bis(2,4,4-trimethylpentyl)phosphinate and tributyl(tetradecyl)phosphonium chloride) were used as Zn(II) carriers in o-NO2C6H4OC8H17-plastified poly(vinyl chloride) or cellulose triacetate-based inclusion membranes. Zn(II) transport depended on ionic liq./plasticizer ratio in the membrane, type of polymer, hydrophobicity of the membrane surface and presence of Fe ions in the feed phase.