title: Preconcentration of copper, cadmium, and lead with a thiacalix[4]arenetetrasulfonate-loaded Sephadex A-25 anion-exchanger for graphite-furnace atomic-absorption spectrometry.
abstract: A rapid column-adsorption method has been developed for concentrating traces of copper, cadmium, and lead in water prior to their determinations by graphite-furnace atomic-absorption spectrometry. The adsorbent used was prepared by loading a strongly basic anion-exchanger QAE-Sephadex A-25 (50 mg) with thiacalix[4]arenetetrasulfonate (20 micromol). Two-hundredfold preconcentration of the analyte elements was achieved by passing 100 mL of sample solution (pH 8.0) through a column packed with the adsorbent (6 mm i.d. x 7 mm high) at a flow rate of 10 mL min(-1) and by the subsequent elution with 500 microL of aqueous nitric acid solution (1 mol L(-1)). The practical applicability of the proposed method was evaluated by analyzing certified reference seawater samples.
authors.affiliation: Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan. h-matsu@numse.nagoya-u.ac.jp
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Matsumiya
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Iki
authors.forename: Sotaro
authors.initials: S
authors.lastname: Miyano
authors.forename: Masataka
authors.initials: M
authors.lastname: Hiraide