ENHANCED LUMINESCENCE OF EUROPIUM BY GADOLINIUM AND ITS APPLICATION

The fluorescence enhancement of the Eu-dibenzoylmethane(DBM)-cetylpyri dinium-chloride (CPC) system was studied. The fluorescence intensity o f the system can be greatly increased by Gd3+ in the presence of triet hanolamine(TEA). The optimum conditions for enhanced fluorescence of t he Eu-Gd-DBM-CPC system were examined. It was a linear function of the Eu3+ concentration in the range of 1.0x10(-10)similar to 1.0x10(-8) m ol dm(-3) under the optimized conditions. The detection limit was 2.6 x 10(-11) mol dm(-3) in an aqueous solution at pH=7.5 similar to 9.5. The Eu-Gd-DBM-CPC system was applied to the determination of europium in rare earth oxides with satisfactory results. The mechanism of enhan ced fluorescence was discussed.