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Aluminon has been investigated for the separation of iron(III) by flotation technique. This reagent formed a 1:1 stable complex in aqueous solution. An intense violet layer is formed after flotation using oleic acid (HOL). A highly selective and sensitive spectrophotometric procedure is proposed for the determination of Fe(III) after overcoming all interferences. Preliminary studies show the possibility of forming a complex with Fe(II) to an extremely low extent. Trials have been carried out to separate Fe(II) and Fe(III) using NH 4 SCN or NaF. To prevent the oxidation of Fe(II), NaBH 4 is used.  The separation of Fe(III) and Fe(II) can be achieved using 0.6 mg L -1 NaBH 4 .  The flotation- determination method was carried out at pH 2-3. The formation constant is 1.3×10 7 L mol -1 with molar absorptivity of 0.2×10 5 L mol -1 cm -1 and detection limit of 5×10 -6 mol L -1 . The effect of foreign ions is avoided using excess aluminon and 0.5 mg L -1 NaBH 4 . The proposed procedure was applied to synthetic mixtures [Fe(III) + Fe(II)], Fe(III) and some cations, wastes of power stations, simulated samples and real ores.

Flotation, speciation and determination of iron(III) using aluminon in water, real samples and wastes of power stations