title: Determination of halide ions in solution by Total Reflection X-ray Fluorescence (TXRF) spectrometry.
abstract: An accurate quantitative determination of halide ions X (X = Cl, Br, I) in aqueous solution by total reflection X-ray fluorescence (TXRF) is not possible using the traditional acidic internal standards. In general, the standard solutions are highly acidic (e.g., Ga(NO3)3 in HNO3) to avoid precipitation of hydroxides of the standard element and to obtain a stable and reliable standard. In acidic solutions, dissolved halide salts can exchange their cation for a proton. The resulting volatile HX compounds can evaporate during the drying procedure of the TXRF sample preparation. In this technical note, we show that an alkaline Cu(NH3)4(NO3)2 standard can be used for the determination of chlorine, bromine and iodine without facing problems of HX evaporation.
authors.affiliation: Department of Chemistry, KU Leuven , Celestijnenlaan 200F P.O. Box 2404, B-3001 Heverlee, Belgium.
authors.forename: Tom
authors.initials: T
authors.lastname: Vander Hoogerstraete
authors.forename: Steven
authors.initials: S
authors.lastname: Jamar
authors.forename: Sil
authors.initials: S
authors.lastname: Wellens
authors.forename: Koen
authors.initials: K
authors.lastname: Binnemans