Electroanalytical determination of trace chloride in room-temperature ionic liquids

Constanza Villagran, C.E. Banks, Christopher Hardacre, R.G. Compton

Research output: Contribution to journalArticlepeer-review

109 Citations (Scopus)

Abstract

The electroanalytical quantification of chloride in [C(4)mim][BF4], [C(4)mim][NTf2] and [C(4)mim][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 [C(4)mim][BF4], [C(4)mim][NTf2], and [C(4)mim][PF6]. Although other methods for chloride have been reported for [BF4](-)- and [PF6](-)-based ionic liquids, no methods have been reported for [NTf2](-) ionic liquids.
Original languageEnglish
Pages (from-to)1998-2003
Number of pages6
JournalAnalytical Chemistry
Volume76 (7)
Issue number7
DOIs
Publication statusPublished - 01 Feb 2004

ASJC Scopus subject areas

  • Analytical Chemistry

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