The absorption spectra of various concentrations of some metal nitrate salts; Co(II), Ni(II), Cu(II) and Cr(III) nitrate, with different concentrations of Eriochrome Black T (E.B.T) dye solutions were studied in the presence and absence of Dowex – S.B.R. anion exchange resin ( nitrate form ) . The calculated values of distribution coefficient k_d illustrate the importance of the E.B.T dye solution as complexing agent for the removal of different metal ions on the Dowex – S.B.R. anion exchange resin. The same studies have been performed for samples in different molarities of nitric acid at constant concentration of E.B.T. and metal ion solution for only Co (II ) and Ni ( II ) ions since Cu ( II ) and Cr ( III ) ions precipitate in the presence of E.B.T. The nitric acid imported also a marked influence on Co and Ni ions complex formation and consequently on their k_d values. Ethanol and acetone were used in different proportions to evaluate the effect of changing the dielectric constant of the medium on the k_d values of the Co and Ni with E.B.T. in the studied solutions. The k_d values are markedly higher in acetone – dye – metal ion - water media as compared with those obtained in aqueous – ethanol – dye – metal ion mixture at the same concentrations. The effects of pH on the absorption and k_d behavior for Co (II) and Ni (II) ions in presence of E.B.T. dye on the Dowex – S.B.R. anion exchange resin were studied and discussed.