Abstract
The extraction of strontium by dialkyl phosphoric acids, where alkyl is n-butyl, n-amyl, n-octyl and 2-ethylhexyl, has been studied. The highest distribution ratio ( qSr) that can be reached increases with increasing number of carbon atoms in the straight alkyl chain, but in the region of low q Sr the length of the n-alkyl group does not affect the extraction efficiency. Branching of the alkyl group reduces the ability of the diakyl phosphoric acid to extract strontium. The extraction efficiency decreases in the series of diluents: aliphatic hydrocarbons > cyclohexane > carbon tetrachloride > toluene. The composition of the strontium complexes with di-n-amyl phosphoric acid in cyclohexane and carbon tetrachloride is SrA 2.3HA. If −log[H +] > 3·5 for the aqueous phase, the complex SrA 2. xHA(5 − x)NaA is formed in cyclohexane, and SrA 4 4− int he aqoueous phase.
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