Abstract
The equilibrium and rate of solvent extraction of iron(III) in 4 M aqueous perchlorate media with trioctylphosphine oxide (TOPO) in hexane have been studied at 25°C. Although the distribution ratio of iron(III) was apparently dependent on the hydrogen-ion concentration, the extracted species was found to be Fe(ClO 4) 3(TOPO) 4 after correction for the decrease in the free TOPO concentration caused by extraction of perchloric acid. The rate was found to be first order with respect to TOPO and inverse first order with respect to hydrogen-ion, and the controlling reaction was assumed to be association of FeOH 2+ with TOPO in the aqueous phase. The extraction was accelerated by chloride, bromide, or nitrate ions (X −) and this was explained by another extraction mechanism controlled by association of FeX 2+ with TOPO in the aqueous phase. It was concluded that the rate of association with TOPO increases in the order of FeOH 2+FeNO 3 2+ > FeBr 2+ > FeCl 2+.
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