Supports treated with a commercial mixture of substituted oximes (Lix-64) are shown to separate copper effectively from several selected cations, namely, iron(II), iron(III), cobalt, nickel, manganese(II), chromium(III), molybdenum, tungsten and vanadium(IV), the eluents being ammonium sulphate, ammonium chloride, sodium chloride or ammonium sulphate plus ammonium hydrogen difluoride solutions. The RF spectra of the various ions are presented, when eluted on paper treated with the extractant, as functions of the pH of the eluting ammonium sulphate or ammonium chloride solutions. Representative separations are reported, either on paper or on cellulose powder columns treated with the extractant.