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Ionic liquid modified silica sorbent for simultaneous separation and preconcentration of heavy metals from water and tobacco samples prior to their determination by flame atomic absorption spectrometry
Maysam Gharehbaghi,Farzaneh Shemirani
Analytical Methods Pub Date : 06/13/2012 00:00:00 , DOI:10.1039/C2AY25171J
Abstract

A new simple, fast, efficient and reusable ionic liquid-based solid phase extraction (IL-SPE) was developed and applied for simultaneous extraction/preconcentration of Cd(II), Co(II), Mn(II), Ni(II) and Pb(II) from water and cigarette tobacco samples as a prior step to their determination by flame atomic absorption spectrometry using micro-sample introduction system (micro-FAAS). In this method, a small amount of [BMIM][PF6] (1-butyl-3-methylimidazolium hexafluorophosphate) was used as a surface modifier of silica substrate. A mini-column packed with the silica-supported ionic liquid sorbent (SiO2–IL) was applied for simultaneous extraction of the metal ions mentioned above, which were complexed with 1-(2-pyridylazo)-2-naphthol (PAN) in the conditioned sample solution. This SiO2–IL system, that employs a hybrid combination of ionic liquid extractive properties and supporting nature of the silica, contributed to increase extraction efficiency via ameliorating mass transfer yield.

Graphical abstract: Ionic liquid modified silica sorbent for simultaneous separation and preconcentration of heavy metals from water and tobacco samples prior to their determination by flame atomic absorption spectrometry
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