title: On-line collection/concentration and determination of transition and rare-earth metals in water samples using Multi-Auto-Pret system coupled with inductively coupled plasma-atomic emission spectrometry.
abstract: On-line preconcentration and determination of transition and rare-earth metals in water samples was performed using a Multi-Auto-Pret system coupled with inductively coupled plasma-atomic emission spectrometry (ICP-AES). The Multi-Auto-Pret AES system proposed here consists of three Auto-Pret systems with mini-columns that can be used for the preconcentration of trace metals sequentially or simultaneously, and can reduce analysis time to one-third and running cost of argon gas and labor. A newly synthesized chelating resin, ethylenediamine-N,N,N'-triacetate-type chitosan (EDTriA-type chitosan), was employed in the Multi-Auto-Pret system for the collection of trace metals prior to their measurement by ICP-AES. The proposed resin showed very good adsorption ability for transition and rare-earth metal ions without any interference from alkali and alkaline-earth metal ions in an acidic media. For the best result, pH 5 was adopted for the collection of metal ions. Only 5 mL of samples could be used for the determination of transition metals, while 20 mL of samples was necessary for the determination of rare-earth metals. Metal ions adsorbed on the resin were eluted using 1.5 M nitric acid, and were measured by ICP-AES. The proposed method was evaluated by the analysis of SLRS-4 river water reference materials for trace metals. Good agreement with certified and reference values was obtained for most of the metals examined; it indicates that the proposed method using the newly synthesized resin could be favorably used for the determination of transition and rare-earth metals in water samples by ICP-AES.
authors.affiliation: Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan.
authors.forename: Rosi Ketrin
authors.initials: RK
authors.lastname: Katarina
authors.forename: Mitsuko
authors.initials: M
authors.lastname: Oshima
authors.forename: Shoji
authors.initials: S
authors.lastname: Motomizu
mesh_terms: D000327:Adsorption; D005618:Fresh Water / Q000032:analysis*; D008674:Metals, Rare Earth / Q000032:analysis* / Q000302:isolation & purification; D012117:Resins, Synthetic; D013054:Spectrophotometry, Atomic / Q000295:instrumentation* / Q000379:methods; D028561:Transition Elements / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D008674:Metals, Rare Earth; D012117:Resins, Synthetic; D028561:Transition Elements