吖啶红-碘化钾体系共振光散射法测定水中痕量铅  

Resonance light scattering method for the determination of trace lead in aqueous solution with acridine red-potassium iodide

作　　者：尹纪成[1] 王小凤[1] 王永生[1] 

机构地区：[1]南华大学公共卫生学院,湖南衡阳421001

出　　处：《应用化工》2013年第1期173-175,共3页Applied Chemical Industry

基　　金：湖南省科技厅科技计划资助项目(2010SK3039)

摘　　要：在20 mmol/L的硫酸溶液中,铅(Ⅱ)与过量的碘化钾形成[PbI4]2-配阴离子,再与碱性阳离子染料吖啶红形成离子缔合物,产生稳定增强的共振光散射,其最大RLS波长位于420 nm处,在5.16×10-8～8.0×10-7mol/L范围内,Pb(Ⅱ)浓度与RLS强度ΔI成正比,检出限为1.55×10-8mol/L。该方法灵敏、反应条件温和、易操作,适用于环境水样中铅的测定。A sensitive resonance light scattering （RLS） veloped based on the interaction of lead with an excess method for the determination of lead has been de- potassium iodide to form [ PbI4 ] 2 - complex, and then the [ PbI4 ] 2- reacts with acridine red to form an ion-association complex in a 20 mmol/L HzSO4 so- lution. The RLS intensity at λmax 420 nm is proportional to the concentration of Pb （ Ⅱ ） in the range of 5.16×10-8 -8.0×10-7 mol/L,and the detection limit for Pb（ Ⅱ ） is 1.55×10-8 mol/L. The method has good sensitivity, mild reaction conditions and easy operation, and is suitable for the determination of lead in environmental water samples.

关 键 词：铅 吖啶红 共振光散射 

分 类 号：TQ016.1[化学工程] O657.39[理学—分析化学]