罗丹明6G-高碘酸钾体系催化荧光光度法测定氟化物

Catalytic fluorescence spectrophotometry determination of fluorine through rhodamine 6 G-potassium periodate system

建立了测定水中微量氟化物的催化动力学光度方法。在硫酸介质中,微量氟化钠对高碘酸钾氧化罗丹明6G具有催化作用,使罗丹明6G的荧光强度减弱。结果表明：溶液的荧光激发波长和发射波长分别为535nm、556nm,氟化钠浓度在0.04~2.8μg·m L^-1时与荧光强度ΔF呈良好的线性关系。其线性回归方程与相关系数为△F=26.94C＋45.135,R2=0.9909,检出限为0.023μg·m L^-1。回收率为98.8%~101%,RSD为0.02~0.85,该方法简便,快速,灵敏度好,准确度高,可用于水中微量氟化物的测定。

A novel catalytic fluorescence method for the determination trace Na F was developed. In sulphuric acid media,trace Na F have the catalysis effect on the oxidation reaction of potassium periodate to rhodamine 6 G,which makes fluorescence decrease. The results showed that the fluorescence excitation wavelength and emission wavelength of the solution were respectively 535 nm and 556 nm,and when the concentration of sodium fluoride is in the range of 0. 04 ~ 0. 04 g·m L-1,the intensity of fluorescence have a good linear relationship with concentration of sodium fluoride,the linear regression equation and coefficient data were △F = 26. 94 C ＋45. 135 and R2= 0. 9909 with respectively. The limit of detection was 0. 023 μg·m L-1,the recoveries ranged from 98. 8%to 101%and RSDs were 0. 02% ~ 0. 85%. This method is simple,rapid,sensitivity and high accuracy,and it can be used in the determination of trace fluoride in water.