铅-碘化钾-罗丹明6G共振瑞利散射法测定环境水样中微量铅  

Determination of micro lead content in environmental water with system of Pb-KI-rhodamine 6G by resonance Rayleigh scattering method

作　　者：罗道成[1] 刘俊峰[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《化学试剂》2007年第9期547-548,568,共3页Chemical Reagents

摘　　要：在0.60 mol/L H3PO4介质中,Pb（Ⅱ）与过量的I^-离子形成[PbI4]^2-配阴离子,并进一步与罗丹明6G（Rh6G）形成离子缔合物,该离子缔合物在315 nm处产生强烈的共振瑞利散射光谱。缔合物体系的散射光强度ΔI与Pb（Ⅱ）的质量浓度在0.04～0.20μg/mL范围内具有良好的线性关系,Pb（Ⅱ）的检出限为0.032μg/mL。方法用于测定环境水样中痕量铅,结果与分光光度法相符。In a medium containing 0.60 mol/L H3PO4,lead（Ⅱ） reacts with excessive I^-to form a complex anion,[PbI4]^2-,which can further react with rhodamine 6G（Rh6G） to form an ion-association complex.The ion-association complex can result in a significant enhancement of resonance Rayleigh scattering at 315 nm.The scattering intensity ΔI of the system is linearly related to the concentration of lead（Ⅱ） in the range of 0.04～0.20 μg/mL.The detection limit of this method for lead（Ⅱ） is 0.032 μg/mL.This method has been applied to the determination of trace lead in environmental water,and its results are in good agreement with those provided by spectrophotometry.

关 键 词：铅 碘化钾 罗丹明6G 共振瑞利散射 

分 类 号：O657.32[理学—分析化学]