β-环糊精与CTAB微乳液协同增敏荧光法测定微量铋研究

Effect of β-Cyclodextrin-Microemulsion on Determination of Trace Bi(Ⅲ) by Spectrofluorimetry

研究了β-环糊精（β-CO）-CTAB微乳液（CTAB—M）混合体系对Bi（Ⅲ）-8-羟基喹啉（HQ）荧光体系协同增敏作用及其机理。结果表明，β-CD对Bi（Ⅲ）-HQ水体系的荧光强度无增敏作用，但β-CD-CTAB-M对Bi（Ⅲ）-HQ系具有较好的协同荧光增敏作用。在优化条件下，铋含量在0．2—1．4mg／L内符合Lambert-Beer定律，检出限（3σ）为13．8μg/L。测定标样及实际样品中铋的含量，结果较满意。

The sensitizing effect of β-cyclodextrin（β-CD） and β-CD-CTAB on the determination of Bi （Ⅲ ） by spectrofluorimetry was studied. The results show that β-CD has no sensitizing effect on Bi （ Ⅲ ） -8-hydroxy quinoline（ HQ）, while β-CD-CTAB microemulsion shows the highest sensitizing effect on the determination of Bismuth（ Ⅲ）-HQ. The proposed method was applied to the determination of Bismuth（ Ⅲ ） in standard and real samples with satisfactory results. Under the optimized conditions, Lambert-Beer＇s law is obeyed in the range of 0.2 - 1.4 mg/L of Bi（ Ⅲ ） and the detection limit（3σ） is 13.8 μg/L.