Dispersive liquid–liquid microextraction using an in situ metathesis reaction to form an ionic liquid extraction phase for the preconcentration of aromatic compounds from water
Dispersive liquid–liquid microextraction using an in situ metathesis reaction to form an ionic liquid extraction phase for the preconcentration of aromatic compounds from water
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DOI：
10.1007/s00216-009-3078-0
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发表时间：
2009-09
影响因子：
4.3
通讯作者：
C. Yao;Jared L. Anderson
中科院分区：
文献类型：
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作者：
C. Yao;Jared L. Anderson
介绍了一种新的微萃取方法的基础上分散液-液微萃取（DLLME），其中原位复分解反应形成水不混溶的离子液体（IL），从水中预先浓缩芳香族化合物，然后使用高效液相色谱分离。与传统的IL DLLME和直接浸没单滴微萃取方法相比，形成基于IL的萃取相的同时萃取和复分解反应大大减少了萃取时间，并且提供了更高的富集因子。考察了萃取溶剂种类、萃取和离心次数、样品溶液体积、萃取液和交换剂、有机溶剂和盐的加入等实验参数对13种芳香族化合物萃取效果的影响。七种多环芳烃的检测限从0.02到0.3 µg L−1不等。方法重现性产生的相对标准偏差值范围为3.7%至6.9%。四个真实的水样，包括自来水，井水，河水，结果表明，离子液体分散液液微萃取法测定水样中的痕量金属离子，回收率在84%~ 115%之间（IL DLLME），其中原位复分解反应形成水不混溶的离子液体，其预处理水不混溶的离子液体。将芳香族化合物从水中浓缩，然后使用高效液相色谱法分离。
A novel microextraction method is introduced based on dispersive liquid–liquid microextraction (DLLME) in which an in situ metathesis reaction forms a water-immiscible ionic liquid (IL) that preconcentrates aromatic compounds from water followed by separation using high-performance liquid chromatography. The simultaneous extraction and metathesis reaction forming the IL-based extraction phase greatly decreases the extraction time as well as provides higher enrichment factors compared to traditional IL DLLME and direct immersion single-drop microextraction methods. The effects of various experimental parameters including type of extraction solvent, extraction and centrifugation times, volume of the sample solution, extraction IL and exchanging reagent, and addition of organic solvent and salt were investigated and optimized for the extraction of 13 aromatic compounds. The limits of detection for seven polycyclic aromatic hydrocarbons varied from 0.02 to 0.3 µg L−1. The method reproducibility produced relative standard deviation values ranging from 3.7% to 6.9%. Four real water samples including tap water, well water, creek water, and river water were analyzed and yielded recoveries ranging from 84% to 115%.FigureA method is introduced based on ionic liquid dispersive liquid–liquid microextraction (IL DLLME) in which an in-situ metathesis reaction forms a water immiscible ionic liquid that pre-concentrates aromatic compounds from water followed by separation using high performance liquid chromatography.