Abstract
Equations have been derived which describe the extraction of Fe(III) from aqueous sulphate solutions by the secondary amine salt di(3,5,5-trimethylhexyl)ammonium sulphate in terms of the equilibria involved. The results give additional evidence for the extraction of partially hydrolysed species such as FeOHSO 4 and (FeOHSO 4) 2. The extraction of Fe(III) deviates from the expected pattern at concentrations of amine sulphate above 0·008 M due to the formation of micelles by the amine sulphate in benzene solution.
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