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Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

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


PMID 28070070

Abstract

In 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, thereby 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.

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