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

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).