Electroanalytical Determination of Trace Chloride in Room-Temperature Ionic Liquids

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

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    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 languageEnglish
    Pages (from-to)1998-2003
    Number of pages6
    JournalAnalytical Chemistry
    Issue number7
    Publication statusPublished - 1 Apr 2004


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