title: Evaluation of different SIA sample-buffer configurations using a fluoride-selective membrane electrode as detector.
abstract: The peak profiles of four different buffer-sample SIA configurations, e.g. buffer-sample; sample-buffer; buffer-sample-buffer and sample-buffer-sample with the last two in the sandwich mode were evaluated with a fluoride-selective membrane electrode as detector. The best response characteristics and peak shapes as well as recovery and precision values were obtained for the buffer-sample configuration. For low concentration levels, sandwich SIA configurations are more suitable, when optimum buffer and pH are used. The utilisation of a cheap electrolyte with a minimum consumption of buffer and a cheap, robust instrumentation made the SIA system suitable for on-line determination of fluoride.
authors.affiliation: Department of Chemistry, University of Pretoria. Pretoria 0002, South Africa.
authors.forename: J K
authors.initials: JK
authors.lastname: van Staden
authors.forename: R I
authors.initials: RI
authors.lastname: Stefan
authors.forename: S
authors.initials: S
authors.lastname: Birghila