title: Analysis of inorganic anions by electrostatic ion chromatography using zwitterionic/cationic mixed micelles as the stationary phase.
abstract: The inability to separate fluoride, phosphate and sulfate by electrostatic ion chromatography (EIC) was overcome by using an ODS silica column coated with mixed zwitterionic-cationic surfactants as the stationary phase. The best results were obtained using the zwitterionic surfactant, 3-(N,N-dimethylmyristylammonium)-propanesulfonate (C19H41NO3S), and the cationic surfactant, myristyltrimethylammonium, CH3(CH2)13N+(CH3)3, in a 10:1 molar ratio in the column coating solution. With a dilute solution of sodium tetraborate as the eluent the model analyte anions were completely separated in the following elution order: F, HPO42-, SO42-, Cl-, NO2-, Br-, NO3-. The very early elution of phosphate and sulfate is most unusual and is unique to this system. Detection limits better than 1.1 x 10(-4) mM and linear calibration plots up to 7.0 mM were obtained with a suppressed conductivity system.
authors.affiliation: Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Hu
authors.forename: P R
authors.initials: PR
authors.lastname: Haddad
authors.forename: K
authors.initials: K
authors.lastname: Hasebe
authors.forename: H A
authors.initials: HA
authors.lastname: Cook
authors.forename: J S
authors.initials: JS
authors.lastname: Fritz