Ion Exchange distribution coefficient K_d-values have been measured for the partition of some metal ions, between Tulsion T–42 NH₄ - form and a media which contain organic - aqueous - Sulfamate systems. A decreasing behavior of the distribution coefficients with the increase of sulfamate solution has been observed. The influence of change of the dielectric constant (DC) of the sorption medium has been also evaluated by using 10%, 20%, 30% and 40% (v/v) of the dioxan solution. Based on the calculated K_d - values obtained from the experimental data, several useful separations have been suggested and investigated for some binary systems under study.