Add time:07/15/2019         Source:sciencedirect.com

In this paper, we found a new enhancement fluorescence system La-Tb-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid (or ciprofloxacin, CPFX)-sodium dodecylbenzenesulfonate (SDBS), and the characteristic fluorescence of the La-Tb-CPFX-SDBS system was studied in detail. The effect of the experimental conditions on the fluorescence intensity was defined. By adding a suitable amount of La3+ to the Tb-CPFX-SDBS system, the fluorescence can be enhanced approximately three-fold. The fluorescence intensity is a linear function of europium up to a limit of 5.0×10−10 mol/l. The system was used for determination of terbium in rare earth samples with satisfactory results. The mechanism of fluorescence enhancement is also discussed.

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