A Novel Chemosensor for Fe(III) Based on Phosphorescence Quenched 9-Bromophenanthrene Induced by β-Cyclodextrin Combined with Flow Injection Renewable Drop

Abstract

A novel phosphorescent chemosensor for Fe(III) based on room-temperature phosphorescence (RTP) using the method of flow injection renewable drop (FIRD) was developed. A RTP of 9-bromophenanthrene (BrP) can be induced by β-cyclodextrin (β-CD) in the presence of cyclohexane (CH); however, trace Fe(III) caused a decrease of the RTP emission. The optimal conditions were investigated. Under the optimal conditions, the analytical curve of Fe³⁺ gave a linear dynamic range of 4.0 × 10⁻⁷ mol(L⁻¹∼6.0 × 10⁻⁴ mol(L⁻¹, with a detection limit of 36 μg/L. When the established CD-RTP method was applied to determine the concentrations of Fe(III) in synthetic samples, the experiment results demonstrated that the range of recovery was 97.3%–102%, with a relative standard deviation less than 2.05% (n = 6).

Keywords:

• BrP
• Fe(III)
• FIRD
• RTP

Acknowledgments

This work was supported by the Natural Science Foundation of Shanxi Province (2009011015–1) and the Key Project of National Natural Science Foundation of China (50534100).

Notes

^a The river water obtained from DaTong YuHe River.

^b The tap water obtained from DaTong University.

^c Mean of six determination.

^d Standard deviation.

^e Recovery=C _found /C _added by Standard addition method using the method of RTP based on droplet.