摘要
在pH 2.8～4.5的Britton-Robinson缓冲溶液中,1,10-邻菲哕啉（phen）与Zn（Ⅱ）形成二价螯合阳离子后,通过静电引力和疏水作用力与曙红Y（EY）阴离子反应形成Zn（Ⅱ）：phen：EY为1：2：2的离子缔合物,导致体系的荧光猝灭,二级散射（SOS）和倍频散射（FDS）增强,共振rayleigh散射（RRS）显著增强,且在一定范围内Zn（Ⅱ）浓度与荧光、散射强度均成线性关系,其中RRS法具有较高的灵敏度,检出限可达0.49 ng/mL.研究了该体系的光谱特征,考察了RRS法最佳的反应条件、灵敏度、选择性及分析应用,并初步探讨了该三元体系的反应机理和RRS增强的原因,据此发展了一种用RRS技术灵敏、简便、快速测定Zn（Ⅱ）的方法.
In pH 2.8 ~ 4.5 Britton-Robinson （BR） buffer solution, Zinc （ II ）reacted with 1,10-Phenan-throline monohydrate（1,10-phen） to form a cationic chelate [ ZnL2]^ 2＋, which further reacted with an anionic dye such as eosin Y （EY） to form ternary ion-association complex （ [ ZnL2 ] [ EY ] 2, leading to the fluorescence quenching, secondary scattering （SOS） and double frequency scattering （FDS） being enhanced, and resonance rayleigh scattering （RRS） being greatly enhanced. The fluorescence and scattering intensity were directly proportional to the concentration of Zinc （Ⅱ） in a certain range. Among these methods, the RRS method was most sensitive, and its detection limit was 0.49 ng/mL for Znic （Ⅱ）. The characteristics of the spectra were studied. The optimum reaction conditions, sensitivity, selectivity and analytical applications were investigated. Moreover, the reaction mechanism and the reasons for the enhancement of RRS were discussed. According to these, a sensitive, simple and rapid RRS method for the determination of Znic （Ⅱ） had been developed.
出处
《郑州大学学报（理学版）》
CAS
北大核心
2014年第3期69-75,84,共8页
Journal of Zhengzhou University:Natural Science Edition
基金
国家自然科学基金资助项目,编号31240089
