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Electroextraction and electromembrane extraction: Advances in hyphenation to analytical techniques

机译:电萃取和电膜萃取:连字技术在分析技术方面的进展

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摘要

Electroextraction (EE) and electromembrane extraction (EME) are sample preparation techniques that both require an electric field that is applied over a liquid‐liquid system, which enables the migration of charged analytes. Furthermore, both techniques are often used to pre‐concentrate analytes prior to analysis. In this review an overview is provided of the body of literature spanning April 2012–November 2015 concerning EE and EME, focused on hyphenation to analytical techniques. First, the theoretical aspects of concentration enhancement in EE and EME are discussed to explain extraction recovery and enrichment factor. Next, overviews are provided of the techniques based on their hyphenation to LC, GC, CE, and direct detection. These overviews cover the compounds and matrices, experimental aspects (i.e. donor volume, acceptor volume, extraction time, extraction voltage, and separation time) and the analytical aspects (i.e. limit of detection, enrichment factor, and extraction recovery). Techniques that were either hyphenated online to analytical techniques or show high potential with respect to online hyphenation are highlighted. Finally, the potential future directions of EE and EME are discussed.
机译:电萃取(EE)和电膜萃取(EME)是样品制备技术,它们都需要在液-液系统上施加电场,从而能够带电分析物迁移。此外,两种技术通常在分析之前用于预浓缩分析物。在本综述中,提供了有关EE和EME的2012年4月至2015年11月文献的概述,重点是对分析技术的连接。首先,讨论了EE和EME中浓度提高的理论方面,以解释提取回收率和富集因子。接下来,基于对LC,GC,CE和直接检测的连字技术概述了这些技术。这些概述涵盖了化合物和基质,实验方面(即供体体积,受体体积,提取时间,提取电压和分离时间)和分析方面(即检测限,富集因子和提取回收率)。着重介绍了在联机断字时连接到分析技术或在联机断字方面显示出高潜力的技术。最后,讨论了EE和EME的潜在未来方向。

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