title: Synthesis of cross-linked chitosan modified with the glycine moiety for the collection/concentration of bismuth in aquatic samples for ICP-MS determination.
abstract: A chelating resin, cross-linked chitosan modified with the glycine moiety (glycine-type chitosan resin), was developed for the collection and concentration of bismuth in aquatic samples for ICP-MS measurements. The adsorption behavior of bismuth and 55 elements on glycine-type chitosan resin was systematically examined by passing a sample solution containing 56 elements through a mini-column packed with the resin (wet volume; 1 ml). After eluting the elements adsorbed on the resin with nitric acid, the eluates were measured by ICP-MS. The glycine-type chitosan resin could adsorb several cations by a chelating mechanism and several oxoanions by an anion-exchange mechanism. Especially, the resin could adsorb almost 100% Bi(III) over a wide pH region from pH 2 to 6. Bismuth could be strongly adsorbed at pH 3, and eluted quantitatively with 10 ml of 3 M nitric acid. A column pretreatment method with the glycine-type chitosan resin was used prior to removal of high concentrations of matrices in a seawater sample and the preconcentration of trace bismuth in river water samples for ICP-MS measurements. The column pretreatment method was also applied to the determination of bismuth in real samples by ICP-MS. The LOD of bismuth was 0.1 pg ml(-1) by 10-fold column preconcentration for ICP-MS measurements. The analytical results for bismuth in sea and river water samples by ICP-MS were 22.9 +/- 0.5 pg ml(-1) (RSD, 2.2%) and 2.08 +/- 0.05 pg ml(-1) (RSD, 2.4%), respectively.
authors.affiliation: Department of International Conservation Studies for Cultural Properties, Faculty of Cultural Properties, Kibi International University, Takahashi, Okayama 716-8508, Japan. oshita@kiui.ac.jp
authors.forename: Koji
authors.initials: K
authors.lastname: Oshita
authors.forename: Osamu
authors.initials: O
authors.lastname: Noguchi
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Oshima
authors.forename: Shoji
authors.initials: S
authors.lastname: Motomizu
mesh_terms: D001729:Bismuth / Q000032:analysis*; D048271:Chitosan / Q000138:chemical synthesis*; D004784:Environmental Monitoring; D005998:Glycine / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry; D012117:Resins, Synthetic / Q000737:chemistry; D014131:Trace Elements / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D012117:Resins, Synthetic; D014131:Trace Elements; D014867:Water; D048271:Chitosan; D005998:Glycine; D001729:Bismuth