介孔Al2O3分离富集-火焰原子吸收法测定麻黄和马钱子中的铅  

Determination of lead in ephedra herb and semen strychni by flame atomatic absorption spectrometry after separation/preconcentration with mesoporous Al_2O_3

作　　者：刘琳[1] 周方钦[1] 屈东方[1] 李文山[1] 李春艳[1] 

机构地区：[1]湘潭大学化学学院,环境友好化学与应用省部共建教育部重点实验室,湘潭411105

出　　处：《分析试验室》2011年第11期1-4,共4页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(21005068)资助

摘　　要：研究了介孔Al203分离富集-火焰原子吸收法测定麻黄和马钱子中的铅的新方法。探讨了溶液pH、吸附温度、洗脱条件及共存离子对铅分离富集的影响。在最佳实验条件下,介孔Al203能定量、快速吸附试液中的痕量Pb2+,其静态饱和吸附容量为8.53 mg/g。吸附在介孔Al203上的Pb2+可用0.2 mol/LEDTA完全洗脱。该方法线性范围为0.1～4.0μg/mL,检出限为67.9 ng/mL,相对标准偏差(RSD)为1.6%(n=7,ρ=2.0μg/mL)。加标回收率在94.1%～105.6%之间。方法可用于麻黄、马钱子中铅的测定。A new method for the determination of trace lead based on mesoporous Al2O3 separation/ preconcentration by flame atomic adsorption spectrometry （FAAS） was studied. In this process, the effects of pH of solution, temperature, elution conditions on preconcentration of trace lead were investigated. Under the optimum conditions, the mesoporous Al2O3 , whose static adsorption capacity was 8.53 mg/g, could quantificationally adsorb Pb^2＋ and the Pb^2＋ adsorbed on mesoporous Al2O3 was eluted with 0. 2 mol/L EDTA. The linear range of determination was 0. 1 - 4. 0 μg/mL. The detection limit of this method for Pb^2＋ was 67.9 ng/mL, and the relative standard deviation （RSD） was 1.6 % （ n = 7, c = 2. 0 μg/mL）. The recoveries of Pb^2＋ ranged from 94. 1% to 105.6 %. The proposed method has been applied to the determination of lead in ephedra herb and semen strychni samples with satisfactory results.

关 键 词：介孔Al2O3 分离富集 麻黄 马钱子 铅 火焰原子吸收法 

分 类 号：O657.32[理学—分析化学]