Fluorimetric Determination of Europium Based on the Co-Fluorescence System Eu-Y-Sparfloxacin-SDS

A new room temperature fluorescence enhancement system based on complex formation between europium and sparfloxacin in the presence of yttrium in sodium dodecyl sulfate micelle solution has been discovered. The characteristic fluorescence spectra and the effect factors of the fluorescence intensity of the system have been studied in detail. The study results show that the binary complex formed by europium with sparfloxacin in sodium dodecyl sulfate micelle solution can emit intrinsic fluorescence of the lanthanide ion. In the presence of yttrium, the fluorescence intensity of this system was enhanced about 5-fold compared with that of the system without Y³⁺. Under the optimum conditions selected, the fluorescence intensity is a linear function of the concentration of europium in the range of 5.0×10^–11–5.0×10^–7molL^–1, and the detection limit of europium is 1.0×10^–13molL^–1. The system was used for the determination of trace amounts of europium in rare earth samples with satisfactory results.