title: Preconcentration of trace copper with yeast for river water analysis.
abstract: A new preconcentration method with yeast is presented. The method was evaluated for the determination of trace copper in river water by graphite furnace atomic absorption spectrometry (GFAAS). A suitable cultivation bed for preconcentration of copper was 3.5 mg ml(-1) 2-ammonium hydrogen phosphate. The optimal cultivation time and temperature were 2 h and 40 degrees C. Under optimal conditions, copper in aqueous sample was concentrated about seven-fold by yeast. The detection limit was 85 pg ml(-1) (3S/N) for copper in river waters. The yeast preconcentration method was applied to the determination of copper in river waters. The recovery of spiked copper was in the range of 93-100%. By the preconcentration, it was found that ultra trace copper in river waters could be determined without interferences of matrix elements, after only the cultivation and no chemical treatment.
authors.affiliation: Department of Chemistry for Materials, Faculty of Engineering, Mie University, Mie, Tsu, 514, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ohta
authors.forename: H
authors.initials: H
authors.lastname: Tanahasi
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Kaneco