The Co-luminescence Effect of Eu–Gd–Ofloxacin–SDBS System and its Analytical Application

Abstract

A fluorescence enhancement phenomenon in the europium (Eu)-Ofloxacin (OF)-Sodium Dodecyl Benzene Sulfonate (SDBS) fluorescence system was observed when Gd(3+) was added. The fluorescence intensity of the systems was measured (lambda (ex)/lambda (em) = 280/612 nm) at pH 7.8. Under optimum conditions, a linear relationship between the enhanced fluorescence intensity and the Eu(3+) concentration in the range of 5.0 x 10(-10) approximately 2.0 x 10(-7) mol x L(-1) was observed. The detection limit of Eu(3+) was 1.46 x 10(-10) mol x L(-1) (S/N = 3). This method was used for the determination of trace amounts of europium in synthetic rare earth samples with satisfactory results. In addition, the interaction mechanism is also studied.

The co-luminescence effect of a europium (III)–lanthanum (III)–gatifloxacin–sodium dodecylbenzene sulfonate system and its application for the determination of trace amount of europium (III)

“…Europium-sensitized luminescence 1.0 Â 10 -10 5.0 Â 10 À 9 $ 1.0 Â 10 -6 [6] Europium-sensitized luminescence 1.0 Â 10 À 10 5.0 Â 10 À 9 $ 2.5 Â 10 À 6 [7] Co-luminescence 2.0 Â 10 À 11 1.0 Â 10 À 9 $ 2.0 Â 10 À 7 [15] Co-luminescence 1.0 Â 10 À 13 5.0 Â 10 À 11 $ 5.0 Â 10 À 7 [16] Co-luminescence 2.0 Â 10 À 13 1.0 Â 10 À 10 $ 5.0 Â 10 À 7 [17] Co-luminescence 4.0 Â 10 À 13 2.0 Â 10 À 10 $ 2.0 Â 10 À 7 [19] Co-luminescence 1.46 Â 10 À 10 5.0 Â 10 À 10 $ 2.0 Â 10 À 7 [20] Time-resolved co-luminescence 4 Â 10 À 15 [31] Time-resolved co-luminescence 1.9 Â 10 À 14 [32] Time-resolved co-luminescence 3.5 Â 10 À 14 [33] Co-luminescence 7.0 Â 10 À 14 1.0 Â 10 À 10 $ 5.0 Â 10 À 8 Present method Sample 1: Y 3.49 Â 10 À 5 mol L À 1 , La 1.37 Â 10 À 5 mol L À 1 , Ce 3.14 Â 10 À 5 mol L À 1 , Pr 3.97 Â 10 À 6 mol L À 1 , Nd 1.66 Â 10 À 5 mol L À 1 , Sm 6.98 Â 10 À 6 mol L À 1 , Eu 7.24 Â 10 À 7 mol L À 1 , Gd 4.01 Â 10 À 6 mol L À 1 , Tb 6.29 Â 10 À 7 mol L À 1 , Dy 2.65 Â 10 À 6 mol L À 1 , Ho 7.28 Â 10 À 7 mol L À 1 , Er 1.43 Â 10 À 6 mol L À 1 , Tm 1.24 Â 10 À 6 mol L À 1 , Yb 1.50 Â 10 À 6 mol L À 1 , Lu 4.00 Â 10 À 7 mol L À 1 . The microviscosity (Z) of different luminescence systems can be calculated using the equation developed by Shinitzky and Barenholz [34]:…”

“…Another phenomenon of analytical interest is the co-luminescence effect [13][14][15][16][17][18][19][20], which was first found and studied by Yang and Zhu in 1986 [21]. According to this method, addition of certain lanthanide ions, such as La 3 + , Lu 3 + , Gd 3 + , Y 3 + , and Tb 3 + , could greatly enhance the luminescence intensity of the Eu 3 + , Tb 3 + , and Sm 3 + chelates in solution.…”