Selective neutral ionophores play an important role for the development of selective and sensitive chemical sensors. In this payer, the facilitating effect of the cadmium selective ionophore N,N,N',N'-tetrabutyl-3,6-dioxaoctane-dithioamide (ETH1062) on the transfer of heavy metal ions across a water / nitrobenzene microinterface has been studied by steady-state cyclic voltammetry. Complexes of the general composition MLz+ were found for the ions Zn2+ , Ag+ and Tli The formation of ML2z+; complexes was deduced for Cd2+, Cu2+ and Pb2+. The standard potentials (in mV) of the facilitated ion transfer and, in parentheses, the estimated logarithms of the over-all stability constants (molar scale) for Cd2+, Pb2+, Cu2+, Zn2+, Tl+ and Ag+ in nitrobenzene are - 234 (19.6), - 207 (17.9), -157 (17.2), + 95 (8.7), - 170 (6.3) and - 797 (17.9), respectively. The ionophore ETH1062 appears suitable for the design of a voltammetric or amperometric screening sensor for heavy metal ions.