锌(Ⅱ)-硫氰酸盐-中性红体系共振瑞利散射法测定痕量锌  

Resonance rayleigh scattering method for the determination of trace amount of zinc( Ⅱ) with potassium thiocyanate and neutral red dye system

作　　者：盛丽[1] 米莹[1] 陶彩虹[1] 

机构地区：[1]兰州交通大学化工学院,兰州730070

出　　处：《分析试验室》2014年第6期684-686,共3页Chinese Journal of Analysis Laboratory

基　　金：甘肃省财政厅高校基本科研业务费项目(2013059)基金资助

摘　　要：在pH 5.1的HAc-NaAc缓冲溶液中,聚乙烯醇存在下,Zn（Ⅱ）和硫氰酸盐形成的配阴离子[Zn（SCN）4]2-与中性红阳离子结合形成的离子缔合物具有共振瑞利散射光谱,其最强共振瑞利散射峰位于594.5 nm处。基于共振瑞利散射峰的增强,建立了测定痕量Zn（Ⅱ）的共振瑞利散射方法。Zn2＋质量浓度在0~0.5μg/mL范围内呈良好的线性关系,检出限为1.9×10-5μg/mL。方法已用于水样中Zn2＋的测定。In the pH 5.1 HAc-NaAc Buffer solution and polyving akohol medium, zinc （Ⅱ） reacts with excessive SCN^- to form a complex anion, [ Zn（SCN）4]^ 2-, which can further react with neutral red dye to form an anionassociation complex. The ion-association complex can result in a significant enhancement of resonance Rayleigh scattering at 594. 5 nm. The scattering intensity △I of the system is linearly related to the concentration ofzinc（Ⅱ） in the range of 0 -0. 5μg/mL. The detection limit of this method for zinc （II）is 1.9×10^-5μg/mL. This method has been applied to the determination of trace zinc （II） in water with satisfactory results.

关 键 词：共振瑞利散射 锌离子(Ⅱ) 中性红 

分 类 号：O657.3[理学—分析化学]