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Evaluation of a Microfluidic Device for the Electrochemical Determination of Halide Content Sin Ionic Liquids.

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Title: Evaluation of a Microfluidic Device for the Electrochemical Determination of Halide Content Sin Ionic Liquids.
Authors: Ge, R.1, Allen, R. W. K.2, Aldous, L.1, Bown, M. R.2, Doy, Nicola3, Hardacre, C.1 c.hardacre@qub.ac.uk, Maclnnes, J. M.2 j.m.macinnes@sheffield.ac.uk, McHale, G.3, Newtons, M. I.3
Source: Analytical Chemistry. 2/15/2009, Vol. 81 Issue 4, p1628-1637. 10p.
Subjects: Microfluidic devices, Microtechnology, Fluidic devices, Electrochemistry, Halides, Ionic liquids, Electrochemical analysis, Voltammetry, Square waves, Electromagnetic waves, Chromatographic analysis
Abstract: A microfluidic device designed for electrochemical studies on a microliter scale has been utilized for the examination of impurity levels in ionic liquids (ILs). Halide impurities are common following IL synthesis, and this study demonstrates the ability to quantify low concentrations of halide in a range of ILs to levels of ∼5 ppm, even in ILs not currently measurable using other methods such as ion chromatography. To validate the mixer device, the electrochemistry of ferrocene was also examined and compared with spectroscopic and bulk electrochemistry measurements. An automated "sample preparation, delivery, and calibration" method was developed, and the chip successfully used for linear sweep, cyclic voltammetry (under both quiescent and steady-state flowing conditions), square wave voltammetry, and differential pulse voltammetry. An effective method of electrochemically cleaning the electrodes is also presented. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A microfluidic device designed for electrochemical studies on a microliter scale has been utilized for the examination of impurity levels in ionic liquids (ILs). Halide impurities are common following IL synthesis, and this study demonstrates the ability to quantify low concentrations of halide in a range of ILs to levels of ∼5 ppm, even in ILs not currently measurable using other methods such as ion chromatography. To validate the mixer device, the electrochemistry of ferrocene was also examined and compared with spectroscopic and bulk electrochemistry measurements. An automated "sample preparation, delivery, and calibration" method was developed, and the chip successfully used for linear sweep, cyclic voltammetry (under both quiescent and steady-state flowing conditions), square wave voltammetry, and differential pulse voltammetry. An effective method of electrochemically cleaning the electrodes is also presented. [ABSTRACT FROM AUTHOR]
ISSN:00032700
DOI:10.1021/ac802406k