Preconcentration of palladium(II) from water with thionalide loaded on silica gel |
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Authors: | Kikuo Terada Ken Matsumoto Yutaka Taniguchi |
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Institution: | Department of Chemistry, Faculty of Science, Kanazawa University, Kanazawa, Ishikawa 920, Japan |
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Abstract: | 2-Mercapto-N-2-naphthylacetamide (thionalide) on silica gel is used for rapid preconcentration of μg l?1 levels of palladium(II) from aqueous solution, followed by atomic absorption spectrometric measurement. In batch experiments, palladium was quantitatively retained on the gel from solutions 5 M in acid to pH 8; equilibrium was achieved within 10 s. The chelating capacity of the gel was 7.5 μmol Pd g?1 at pH < 4. The effect of flow rate on retention was studied. Palladium retained on the column was completely eluted with 20 ml of 0.2 M thiourea in 0.1 M hydrochloric acid. The palladium concentration in sea water is shown to be < 0.3 μg l?1. |
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