Quantitative Determination of Iron Ions Based on a Resonance Raman (RR) Probe-Phenanthroline

Iii this paper, we demonstrate a new promising resonance Raman (RR)-based method for the determination of Fe 3+ concentrations in aqueous solutions. Iron ions were quantified at a low concentration range by employing hydroxylamine hydrochloride as the reductant, and phenanthroline as the complexing agent, (hereby reducing Fe 3+ to Fe 2+ . The addition of Fe 3+ to the detection reagent resulted in a rapid color change from colorless to orange-red. together with an obvious new RR band appearing at 1459 cm −1 . Herein, the RR intensity of the phenanthroline-Fe 2+ complex strengthened with increasing Fe 3+ concentration, which was identified from the variation of the Raman spectra. Therefore, we successfully detected Fe 3+ at lower concentrations using the proposed method, illustrating its great potential for the detection of Fe 3+ with abundant RR fingerprint information. More importantly, the proposed method exhibited a wide liner range from 0.05 to 10 μg/mL.