Abstract
A sensitive co-fluorescence enhancement system was developed for the fluorimetric determination of terbium. The fluorescence intensity of the chelates of Tb3+ with phenyl salicylate in a solution containing Triton X-100 and ethanol were greatly enhanced by the addition of excesses of La3+, Lu3+, Y3+ and Gd3+. The enhanced fluorescence intensity of the terbium chelates was 33, 20, 11 and 13 fold, respectively. At pH=9.0 the fluorescence intensity of the Tb3+ system with phenyl salicylate and La3+ is a linear function of concentration of Tb3+ in the range of 5.0 × 10−8 - 3.0 × 10−6 mol/L. The detection limit (signal-to-noise ratio = 3) is 3.0 × 10−9 mol/L.
Published Version
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