title: Electroanalytical determination of trace chloride in room-temperature ionic liquids.
abstract: The electroanalytical quantification of chloride in [C4mim][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 [NTf2](-) ionic liquids.
authors.affiliation: The QUILL Centre and The School of Chemistry, Queen's University Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
authors.forename: Constanza
authors.initials: C
authors.lastname: Villagrán
authors.forename: Craig E
authors.initials: CE
authors.lastname: Banks
authors.forename: Christopher
authors.initials: C
authors.lastname: Hardacre
authors.forename: Richard G
authors.initials: RG
authors.lastname: Compton