title: Capillary zone electrophoretic determination of iodide in seawater using transient isotachophoresis with artificial seawater as the background electrolyte.
abstract: We describe an application of capillary zone electrophoresis (CZE) with transient isotachophoresis (ITP) as the on-line concentration procedure for the determination of iodide in seawater. The effective mobility of iodide was decreased by the addition of 10 mM cetyltrimethylammonium chloride (CTAC) to an artificial seawater background electrolyte (BGE) so that transient ITP functioned and iodide was separated from other coexisting anions such as bromide, nitrite, and nitrate in seawater samples. After sample injection, 600 mM acetate was separately injected into the capillary as the terminating ion to generate transient ITP. The limit of detection (LOD) for iodide was 3.0 microg/L. The LOD was obtained at a signal-to-noise ratio (S/N) of 3. The values of the relative standard deviation (RSD) of peak area, peak height, and migration time for iodide were 2.9, 2.1, and 0.6%. The proposed method was applied to the determination of iodide in seawater collected around the Osaka Bay. The results obtained by use of the calibration graph were agreed with those obtained by the addition of the standard solutions for iodide.
authors.affiliation: Research Institute for Marine Cargo Transportation, Kobe University of Mercantile Marine, Kobe, Japan.
authors.forename: Kuriko
authors.initials: K
authors.lastname: Yokota
authors.affiliation: Research Institute for Marine Cargo Transportation, Kobe University of Mercantile Marine, Kobe, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Fukushi
authors.affiliation: College of Analytical Chemistry, Osaka, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Ishio
authors.affiliation: Research Institute for Marine Cargo Transportation, Kobe University of Mercantile Marine, Kobe, Japan.
authors.forename: Nobukazu
authors.initials: N
authors.lastname: Sasayama
authors.affiliation: National Institute of Advanced Industrial Science and Technology, AIST Kansai, Osaka, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakayama
authors.affiliation: National Institute of Advanced Industrial Science and Technology, AIST Kansai, Osaka, Japan.
authors.forename: Sahori
authors.initials: S
authors.lastname: Takeda
authors.affiliation: National Institute of Advanced Industrial Science and Technology, AIST Kansai, Osaka, Japan.
authors.forename: Shin-Ichi
authors.initials: SI
authors.lastname: Wakida
mesh_terms: D002138:Calibration; D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D004573:Electrolytes / Q000737:chemistry*; D004586:Electrophoresis / Q000379:methods*; D019075:Electrophoresis, Capillary / Q000379:methods*; D007454:Iodides / Q000032:analysis*; D012623:Seawater / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002593:Cetrimonium Compounds; D004573:Electrolytes; D007454:Iodides; D000077286:Cetrimonium