Electroanalytical Determination of Trace Chloride in Room-Temperature Ionic Liquids

Constanza Villagrán; Craig E. Banks; Christopher Hardacre; Richard G. Compton

doi:10.1021/ac030375d

Electroanalytical Determination of Trace Chloride in Room-Temperature Ionic Liquids

Constanza Villagrán, Craig E. Banks, Christopher Hardacre, Richard G. Compton

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Abstract

The electroanalytical quantification of chloride in [C ₄mim]-[BF₄], [C₄mim][NTf₂], and [C₄mim][PF₆] ionic liquids has been explored using linear sweep and square wave voltammetry. Cathodic stripping voltammetry at a silver disk electrode is found to be the most sensitive. The methodology is based on first holding the potential of the electrode at +2.0 V (vs Ag wire), to accumulate silver chloride at the electrode. On applying a cathodic scan, a stripping wave is observed corresponding to the reduction of the silver chloride. This stripping protocol was found to detect ppb levels of chloride in [C₄mim][BF₄], [C₄mim][NTf₂], and [C₄mim][PF₆]. Although other methods for chloride have been reported for [BF₄]^-- and [PF₆] ^--based ionic liquids, no methods have been reported for [NTf ₂]^- ionic liquids.

Original language	English
Pages (from-to)	1998-2003
Number of pages	6
Journal	Analytical Chemistry
Volume	76
Issue number	7
DOIs	https://doi.org/10.1021/ac030375d
Publication status	Published - 1 Apr 2004

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title = "Electroanalytical Determination of Trace Chloride in Room-Temperature Ionic Liquids",

abstract = "The electroanalytical quantification of chloride in [C 4mim]-[BF4], [C4mim][NTf2], and [C4mim][PF6] ionic liquids has been explored using linear sweep and square wave voltammetry. Cathodic stripping voltammetry at a silver disk electrode is found to be the most sensitive. The methodology is based on first holding the potential of the electrode at +2.0 V (vs Ag wire), to accumulate silver chloride at the electrode. On applying a cathodic scan, a stripping wave is observed corresponding to the reduction of the silver chloride. This stripping protocol was found to detect ppb levels of chloride in [C4mim][BF4], [C4mim][NTf2], and [C4mim][PF6]. Although other methods for chloride have been reported for [BF4]-- and [PF6] --based ionic liquids, no methods have been reported for [NTf 2]- ionic liquids.",

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T1 - Electroanalytical Determination of Trace Chloride in Room-Temperature Ionic Liquids

AU - Villagrán, Constanza

AU - Banks, Craig E.

AU - Hardacre, Christopher

AU - Compton, Richard G.

PY - 2004/4/1

Y1 - 2004/4/1

N2 - The electroanalytical quantification of chloride in [C 4mim]-[BF4], [C4mim][NTf2], and [C4mim][PF6] ionic liquids has been explored using linear sweep and square wave voltammetry. Cathodic stripping voltammetry at a silver disk electrode is found to be the most sensitive. The methodology is based on first holding the potential of the electrode at +2.0 V (vs Ag wire), to accumulate silver chloride at the electrode. On applying a cathodic scan, a stripping wave is observed corresponding to the reduction of the silver chloride. This stripping protocol was found to detect ppb levels of chloride in [C4mim][BF4], [C4mim][NTf2], and [C4mim][PF6]. Although other methods for chloride have been reported for [BF4]-- and [PF6] --based ionic liquids, no methods have been reported for [NTf 2]- ionic liquids.

AB - The electroanalytical quantification of chloride in [C 4mim]-[BF4], [C4mim][NTf2], and [C4mim][PF6] ionic liquids has been explored using linear sweep and square wave voltammetry. Cathodic stripping voltammetry at a silver disk electrode is found to be the most sensitive. The methodology is based on first holding the potential of the electrode at +2.0 V (vs Ag wire), to accumulate silver chloride at the electrode. On applying a cathodic scan, a stripping wave is observed corresponding to the reduction of the silver chloride. This stripping protocol was found to detect ppb levels of chloride in [C4mim][BF4], [C4mim][NTf2], and [C4mim][PF6]. Although other methods for chloride have been reported for [BF4]-- and [PF6] --based ionic liquids, no methods have been reported for [NTf 2]- ionic liquids.

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JO - Analytical Chemistry

JF - Analytical Chemistry

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IS - 7

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Electroanalytical Determination of Trace Chloride in Room-Temperature Ionic Liquids

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