Preconcentration of copper, cadmium, and lead with a thiacalix[4]arenetetrasulfonate-loaded Sephadex A-25 anion-exchanger for graphite-furnace atomic-absorption spectrometry |
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Authors: | Hiroaki Matsumiya Nobuhiko Iki Sotaro Miyano Masataka Hiraide |
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Institution: | (1) Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan;(2) Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Aoba-ku, Sendai 980-8579, Japan |
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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 thiacalix4]arenetetrasulfonate (20 mol). 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.×7 mm high) at a flow rate of 10 mL min–1 and by the subsequent elution with 500 L of aqueous nitric acid solution (1 mol L–1). The practical applicability of the proposed method was evaluated by analyzing certified reference seawater samples. |
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Keywords: | Preconcentration Chelating adsorbent Calixarene Heavy metals Atomic-absorption spectrometry Seawater |
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