Speciation of iron (II) and (III) by using solvent extraction and flame atomic absorption spectrometry

A method for speciation, preconcentration and separation of Fe2+ and Fe3+ in different matrices was developed using solvent extraction and flame atomic absorption spectrometry. PAN as complexing reagent for Fe2+ and chloroform as organic solvent were used. The complex of Fe2+-PAN was extracted into chloroform phase in the pH range of 0.75-4.0 and Fe3+ remains in water phase in the pH range 0.75-1.25. The optimum conditions for maximum recovery of Fe2+ and minimum recovery of Fe3+ were determined as pH = 1, the stirring time of 20 min, the PAN amount of 0.5 mg and chloroform volume of 8 mL. The developed method was applied to the determination of Fe2+ and Fe3+ in tea infusion, fruit juice, cola and pekmez. It is seen that there is high bioavailable iron (Fe2+) in pekmez. The developed method is sensitive, simple and need the shorter time in comparison with other similar studies.