Abstract
A fluorescence enhancement phenomenon in the europium‐oxolinic acid (OA)‐CTMAB fluorescence system was observed when Gd3+ was added. The fluorescence intensity of the systems was measured (λex = 345 nm, λem = 612 nm) at pH 7.25. Under optimum conditions, a linear relationship between the enhanced fluorescence intensity and the Eu3+ concentration in the range of 2.0 × 10−10 − 1.0 × 10−7 mol/l was observed. The detection limit of Eu3+ was 5.2 × 10−12 mol/l (S/N = 3). This method was used for the determination of trace amounts of europium in rare earth samples with satisfactory results.
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Acknowledgements
This work was supported by the Natural Science Foundation of Shandong Province (No. Y2003B02).