罗丹明G-动力学共振荧光法测定水溶液中的痕量亚硝酸根

在盐酸介质中罗丹明G的分子共振荧光信号强,发射峰尖而对称,受干扰因素少。基于亚硝酸根能催化KBrO3氧化罗丹明G的反应,建立了催化动力学共振荧光分析法测定痕量NO2-。考察了体系荧光强度减弱值(ΔF)的影响因素,优化了反应条件。最大共振荧光峰位于540 nm波长处,NO2-的浓度在4.20~56.0μg/L范围内与ΔF呈良好的线性关系,方法检出限为1.65μg/L。本方法用于环境水样中NO2-的测定,RSD<5.0%,样品加标回收率为98.84%~104.33%。

Kinetic-resonance fluorescence spectra of Rhodamine G and its analytical application

The properties of resonance fluorescence of Rhodamine G(RhG) were studied.RhG itself has a strong resonance fluorescence signal that the resonance fluorescence peak is tine and symmetry in hydrochloric acid medium,with foreign substances do not interfere with it.Based on the catalytic effect of nitrite on the oxidation of RhG by potassium bromate,a catalytic resonance fluorescence method was proposed for the determination of trace nitrite.The affecting factors of intensity of ΔF and the optimum conditions of the reaction systems were investigated.The maximum resonance fluorescence peak was located at 540 nm.The detection limit and the linear range for NO-2 were 1.65 μg/L and 4.20~56.00 μg/L,respectively.Satisfactory results were achieved in comparing ripe method in employing this method into the determination of NO-2 in environmental water samples.The recovery of environmental water was 98.84%～104.33% and the RSD was less than 5.0%.