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FI-ICPMS联用高选择测定复杂基质中的痕量重金属

发表时间:2011-04-15  浏览量:1333  下载量:424
全部作者: 李妍,江焱
作者单位: 天津师范大学化学学院,天津市功能分子结构与性能重点实验室;南开大学化学学院分析科学研究中心
摘 要: 在编结反应器中磁固定巯基功能化的磁性微球作为在线置换固相萃取吸附剂,通过流动注射-电感耦合等离子体质谱法(flow injection-inductive coupled plasma mass spectrometry, FI-ICPMS)联用技术,实现对复杂基质中痕量重金属Hg,Cu,Pb,Cd的选择性置换吸附和无干扰检测。在线置换固相萃取2.7 mL样品,4种重金属的增感因子为45~56,检出限为2.2~5.5 ng/L,样品通量为20 次/h. 对50 ng/L的4种重金属11次重复测定标准偏差为1.4%~2.5%. 此方法已成功应用于洋葱丁、大蒜丁中痕量Hg,Cu,Pb,Cd的选择性测定。
关 键 词: 分析化学;流动注射;磁固定;在线置换固相萃取;电感耦合等离子体质谱;重金属
Title: FI-ICPMS coupling technique for highly selective determination of four heavy metals in complex matrices
Author: LI Yan, JIANG Yan
Organization: Tianjin Key Laboratory of Structure and Performance for Functional Molecule, College of Chemistry, Tianjin Normal University; Research Center for Analytical Science, College of Chemistry, Nankai University
Abstract: An online displacement solid-phase extraction via magnetic immobilization of mercapto-functionalized magnetite microspheres onto the inner walls of a knotted reactor coupled with ICPMS was developed for highly selective preconcentration and interference-free determination of trace heavy metals (Hg, Cu, Pb and Cd) in complex matrices. Online displacement solid-phase extraction of 2.7 mL aqueous solution gave the enhancement factors of 45-56 for the four noble metals in comparison with direct nebulization of aqueous sample solution, and the detection limits (3s) of 2.2-5.5 ng/L for the four noble metals. The sample throughput of the developed method was about 20 samples/h, and the relative standard deviation for eleven replicate determinations of the noble metals at the 50 ng/L level ranged from 1.4% to 2.5%. The developed method was successfully applied to selective determination of trace Hg, Cu, Pb and Cd in onion and garlic.
Key words: analytical chemistry; flowing injection; magnetically immobilization; on-line displacement solid phase extraction; inductively coupled plasma mass spectrometry; heavy metal
发表期数: 2011年4月第7期
引用格式: 李妍,江焱. FI-ICPMS联用高选择测定复杂基质中的痕量重金属[J]. 中国科技论文在线精品论文,2011,4(7):635-640.
 
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