Abstract The carrier-mediated transport of heavy metal ions through bulk liquid membranes has been examined: toxic Hg 2+, Cd 2+ and Pb 2+ ions were studied, along with Cu 2+ ions for comparative purposes. The ability of a new carrier, 2, 2′-bis (p-octyloxybenzyl) diethylenetriamine (bis-pODET), to complex and transport all the selected metal ions is reported. Differing affinities of the carrier for the different metal ions and the different ...