ORGANOPHOSPHORUS REAGENTS AS EXTRACTANTS .6. SYNERGIC EFFECT OF TRIPHENYLPHOSPHINE OXIDE (OR 2,4-PENTANEDIONE) ON THE EXTRACTION OF COPPER(II) USING 8-HYDROXYQUINOLINE

Copper(II) is separated quantitatively from its binary mixtures with C r(III), Mn(II), Co(II), Ni(II), Zn(II), Cd(II), Hg(II), Ag(I), Pb(II) and Mg(II) using synergic combinations of triphenylphosphine oxide (or 2,4-pentanedione) with 8-hydroxyquinoline. The anions tested, viz., C l-, NO3, CH3COO- and SO4(2) do not interfere; Fe(III), however, interf eres in the extraction of Cu(II). The nature of species, their extract ion and stability constants are calculated from the metal distribution data using linear regression analysis. The nature of extracted specie s of Cu(II) with 2,4-pentanedione alone is also reinvestigated.