Abstract
The extraction of Ca(II), Sr(II) and Ba(II) from aqueous mineral acid, in the presence and absence of the corresponding sodium salt, into xylene solutions of (GO) 2PO(OH), G = 2-ethyl hexyl and para (1,1,3,3 tetramethyl butyl) phenyl, and of (GO)G′PO(OH), G = n-octyl and G′ = phenyl and chloro methyl, has been investigated radiometrically. The distribution ratio, K, has been found to be inversely second-power dependent upon the hydrogen ion concentration in the equilibrated aqueous phase. The dependency of K upon the concentration of extractant in the equilibrated xylene phase was found to be 2·5-power for Ca and Sr and 3·0-power for Ba in systems involving bis [para (1,1,3,3 tetramethyl butyl) phenyl] phosphoric acid or n-octyl hydrogen chloromethyl phosphonate; 3·0-power for Ca, Sr and Ba in systems involving n-octyl hydrogen phenyl phosphonate; and 3·0-power for Ca (Sr and Ba not proved) in systems involving bis(2-ethyl hexyl) phosphoric acid. The effect of structural differences in the extractants is discussed, and the extraction of alkaline earths (II) is compared with that of Pm(III) and Cm(III).
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