Analytical Sciences

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

Liang WANG,* Yi ZHANG,* Yeonju PARK,** Lei CHEN,*,** and Young Mee JUNG**

*Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Jilin Normal University, Ministry of Education, Changchun 130103, P. R. China
**Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 24341, Korea

In this paper, we demonstrate a new promising resonance Raman (RR)-based method for the determination of Fe³⁺ 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, thereby reducing Fe³⁺ to Fe²⁺. The addition of Fe³⁺ 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-Fe²⁺ complex strengthened with increasing Fe³⁺ concentration, which was identified from the variation of the Raman spectra. Therefore, we successfully detected Fe³⁺ at lower concentrations using the proposed method, illustrating its great potential for the detection of Fe³⁺ with abundant RR fingerprint information. More importantly, the proposed method exhibited a wide liner range from 0.05 to 10 μg/mL.

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