稀土元素荧光增强效应的研究──RE对Eu-2-(2-二苯乙酰基)-1,3-茚二酮-十六烷基三甲基溴化铵体系的荧光增强

研究了稀土元素La3+、Gd3+、Yb3+、Lu3+、Y3+及Sc3+对Eu-2-(2-二苯乙酰基)-1,3-茚二酮-阳离子表面活性剂体系的荧光增强效应,结果表明,在上述增强离子存在下,体系的荧光强度分别增加10、130、30、50、52和20倍,利用标准加入法测定了混合稀土氧化物中的铕,铕浓度在1.0×10-10～6.0×10-7mol/L范围内与荧光强度呈线性关系,最低检出限为6.0×10-12mol/L.

Studies on Fluorescence Enhancement of Rare Earths──The Fluorescence Enhancement of Europium-2-(2-diphenylacetyl) indan-1,3-dione-cetyltrimethylammonium Bromide System by Ln3+

Afluorescence enhancenient phenomenon shown by adding La, Gd, Tb, Lu, Y, or Sc ion to Eu-2-(2-diphenylacetyl)indan-1, 3-dione (DPN)-cetyltrimethylammonium bromide(CTMAB) system was observed. In the presence of above enhancing ions, the fluorescence intensity of the system can be increased about 10, 130, 30, 50, 52 or 20-fold, respectively than that of the system containing no enhancing ion, and it was a linear function of theconcentration of europium in the range 1.0×10-10 6.0×10-7mol/L.The detection limitwas 6.0×10-12mol/L.The system was used for the spectrofluorimetric determination of europium in the rare earth oxides and gave satisfactory results.