吖啶红-碘化钾体系共振光散射法测定水中痕量铅
Applied Chemical Industry(2013)
Abstract
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。
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Key words
Pb(Ⅱ),resonance light scattering,acridine red
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