Fluorescent probe for detecting Fe<3+> and detecting Ca<2+> by using Fe<3+> and preparation and use methods thereof

The invention provides a fluorescent probe for detecting Fe and detecting Ca by using Fe and preparation and use methods thereof, and relates to a fluorescent probe for detecting Fe and Ca and preparation and use methods thereof. The fluorescent probe aims at solving the technical problems that the material cost of the existing Fe fluorescent probe is high; the interferenceby other metal ions easily occurs; meanwhile, during the detection of the two metal ions, the fluorescence phenomenon differences are not obvious; the existing fluorescent probe cannot be used for continuous detection. The fluorescent probe has a structure formula shown in the description. The fluorescent probe is obtained from 2-(3-aminophenyl)benzimidazole and furfural through reaction. The fluorescent probe solution and a sample solution possibly containing Fe are tested by a fluorescence spectrometer; then, the fluorescence intensity is tested. If the intensity is reduced through being compared with that of t