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ABSTRACT
The sensitized fluorescence of the terbium ion (Tb3+) can be observed when excited in the presence of fleroxacin (FLRX) in the aqueous solution because a Tb3+ -FLRX complex was formed. The sensitised fluorescence was greatly enhanced after the complex system was irradiated by 365nm ultraviolet light. The irradiation makes the complex system undergo photochemical reactions and a new terbium complex which is more favourable to the intramolecular energy transfer is formed. On this basis a new sensitive and selective photochemical fluorimetric method for the determination of FLRX was developed. Under the optimum experimental conditions, the linear range of the determination is 1.0—200×10−7 mol 1−1 for FLRX, and the detection limit is 1.2×10−8mol 1−1. Without any pre-treatment the recoveries of FLRX in human urine samples were determined with satisfaction.
