同多钨酸根共振瑞利散射光谱法测定硫酸奎宁  

Isopoly-Tungstic Acid Resonance Rayleigh Scattering Method for the Determination of Quinine Sulfate

作　　者：孔玲[1] 刘忠芳[1] 刘绍璞[1] 

机构地区：[1]西南大学化学化工学院,重庆400715

出　　处：《西南大学学报（自然科学版）》2010年第7期62-65,共4页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20875078);西南大学校青年基金资助项目(20710403)

摘　　要：在pH=2.2~3.4的HCl-NaAc弱酸性介质中,硫酸奎宁和同多钨酸根相结合生成离子缔合物,能引起共振瑞利散射的显著增强,且散射强度与硫酸奎宁的浓度在一定范围内成正比,检出限为7.7 ng/mL.考察了共存物质的影响,表明该方法具有较好的选择性.用于汤尼水（Tonic Water）中奎宁的测定,结果满意.并对离子缔合物的形成和RRS增强的原因进行了讨论.In an HCl-NaAc medium with a pH of 2.2-3.4,quinine sulfate reacted with isopoly-tungstic acid to form an ion-association complex,which resulted in a significant enhancement of resonance Rayleigh scattering（RRS）.The scattering intensity was linearly related to the concentration of quinine sulfate and the detection limit for quinine sulfate was 7.7 ng/mL.An investigation of the effects of coexisting substances showed that this method had a relatively good selectivity.The method was applied to the determination of quinine in tonic water with satisfactory results.The mechanisms for the formation of the ion-association complex and the enhancement of RRS are discussed in this paper.

关 键 词：共振瑞利散射 同多钨酸根 硫酸奎宁 

分 类 号：O657.3[理学—分析化学]