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.
出处
《应用化工》
CAS
CSCD
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)
关键词
铅
吖啶红
共振光散射
Pb（ Ⅱ ）
acridine red
resonance light scattering
