Dang Fangfang, Li Ying, Liu Weisheng
Department of Chemistry and State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Mar;66(3):676-80. doi: 10.1016/j.saa.2006.04.010. Epub 2006 Apr 28.
A sensitive fluorescence enhancement system was developed for the determination of terbium. The fluorescence intensity of the Tb-N-(2-pyridinyl) ketoacetamide (PKAA) system was greatly enhanced by the addition of triethylamine (Et(3)N) and zinc nitrate in the methanol solution. The excitation and emission wavelengths were 329 and 546 nm, respectively. Under optimal conditions, the fluorescence intensities varied linearly with the concentration of Tb(3+) in the range of 7.5 x 10(-8)-8.2 x 10(-6)M with a detection limit of 6.4 x 10(-8)M. The interferences of some rare earth ions were described. This method was applied to the determination of trace amounts of terbium (III) in a synthetic rare earth oxide and a high purity Y(2)O(3) matrix. The mechanism of fluorescence enhancement was also studied.
开发了一种用于测定铽的灵敏荧光增强系统。在甲醇溶液中加入三乙胺（Et(3)N）和硝酸锌后，Tb-N-(2-吡啶基)酮乙酰胺（PKAA）体系的荧光强度大大增强。激发波长和发射波长分别为329和546nm。在最佳条件下，荧光强度与Tb(3+)浓度在7.5×10(-8)-8.2×10(-6)M范围内呈线性关系，检测限为6.4×10(-8)M。描述了一些稀土离子的干扰情况。该方法应用于合成稀土氧化物和高纯Y(2)O(3)基体中痕量铽（III）的测定。还研究了荧光增强的机理。
