共振散射法测定中草药中的微量铬  

Determination of trace chromium in traditional chinese medicines by resonance light scattering

作　　者：李娜[1] 刘玮炜[1] 周洪英[1] 周丽华[1] 赵跃强[1] 

机构地区：[1]淮海工学院化学工程系,连云港222005

出　　处：《分析试验室》2007年第6期85-87,共3页Chinese Journal of Analysis Laboratory

基　　金：淮海工学院化学工程系自然科学基金(HGX05014);淮海工学院自然科学基金(KK04062)项目资助

摘　　要：研究了在H2SO4介质中,Cr（Ⅵ）与碘化物和淀粉形成离子缔合物的共振光散射增强现象,拟定了一种新的测定Cr（Ⅵ）的共振光散射方法,通过实验确定了溶液中Cr（Ⅵ）浓度与散射光强度之间的关系,在λex＝λem＝290 nm处,共振光散射最强,且共振光散射强度与Cr（Ⅵ）浓度呈线性关系,该方法简便快速,线性范围为34～400 μg/L,检出限为6.7 μg/L,可用于中草药样品中铬的测定.A new resonance light scattering method for the determination of Cr（Ⅵ） has been studied, based on the enhanced effect of resonance light scattering （RLS） on the formation of Cr（Ⅵ）-I^- -starch ionic associate. The optimum reaction conditions and the quantitative relationship between the intensity of RIB （ IRLS ） and the concentration of Cr（Ⅵ） have been established. The leas is maximum at 290 nm and proportional to the concentration of Cr（Ⅵ）. The method is simple, rapid and has a detection limit of 6.7μg/L. The linear range is 34 - 400 μg/L for Cr（Ⅵ）. The proposed method has been used to determine Cr（Ⅵ） in the Traditional Chinese Medicine （TCM） samples with satisfactory results.

关 键 词：铬 中草药 共振散射 

分 类 号：O657.32[理学—分析化学]