Abstract
Uranium is quantitatively adsorbed by the non-ionic phosphorylated resin diethyl polystyrene-methylenephosphonate (EPMP) from 2 per cent solutions of dibutyl phosphoric acid (HDBP) in benzene. Iron (Fe 3+), lanthanum, zirconium, niobium, thorium and mixed fission products when present in the HDBP/benzene phase are not adsorbed. Adsorption of uranium from solutions containing the complex UO 2(DBP) 2·2HDBP results in the liberation of approximately two equivalents of HDBP and is considered to occur via the mechanism. 2EPMP + UO 2(DBP) 2·2HDBP ⇌ UO 2(DBP) 2·2EPMP + (HDBP) 2. The uranium is quantitatively eluted with a benzene solution of dimethyl formamide. Under low loading conditions HDBP is adsorbed in the absence of uranium as EPMP·HDBP. The selectivity for uranium is compared with the synergic enhancement of uranium extraction with combinations of non-ionic and acidic phosphorylated solvents.
Published Version
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