Siberian Federal University

Sorbents based on zirconium oxide and titanium oxide sequentially modified polyhexamethylene guanidine and 4,7-diphenyl-1,10-phenantrolinedisulfonic acid were synthesized. The sorbents quantitatively extract the iron(II) from solutions of pH 4.0 – 7.0 (recovery ratio 98 – 99 %). Intensely colored iron(II) complexes are formed on the sorbents surface during the adsorption process. Diffuse reflectance spectra have maximum at 540 nm. The sorbent based on zirconium oxide has more intense color. These reactions were successfully applied for developing of sorption-photometric method of iron(II) determination. The detection limit was 0.05 μg per 0.1 g of the sorbent. The calibration function was linear up to 8 μg per 0.1 g of the sorbent. The method was used for the determination of iron in natural and mineral waters