DETERMINATION OF TRACE EUROPIUM BASED ON NEW TERNARY FLUOROMETRIC ENHANCEMENT SYSTEM OF EUROPIUM(III) WITH THENOYLTRIFLUOROACETONE AND TRISALICYLICAMIDO TRIETHYLAMINE

In this work, a newly synthesized ligand, trisalicylicamido triethylam ine, acts as a specific reagent for enhancing the fluorescence intensi ty of Eu-III complex with thenoyltrifluoroacetone. The spectrofluorime tric determination of trace amounts of Eu-III based on the above syste m was carried out and its luminescence mechanism was studied. The exci tation and emission wavelengths are 348.9 nm and 613.4 nm, respectivel y. The fluorescence intensities vary linearly with the concentration o f Eu-III in the range 7.598 x 10(-7) g l(-1)3.799 x 10(-4) g l(-1) wit h a detection limit of 1.520 X 10(-8) g l(-1) and a standard deviation of 1.80 x 10(-6) g l(-1) for 10 measurements. The interferences of so me rare-earth metals and inorganic ions are described. This method is a direct, rapid, selective and sensitive analytical procedure for the determination of trivalent europium in high purity yttrium oxide.