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Adsorption Behavior of Mercury and Precious Metals on Cross-Linked Chitosan and the Removal of Ultratrace Amounts of Mercury in Concentrated Hydrochloric Acid by a Column Treatment with Cross-Linked Chitosan

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Abstract

Cross-linked chitosan was synthesized with chitosan and ethylene glycol diglycidyl ether. The adsorption behavior of trace amounts of metal ions on the cross-linked chitosan was systematically examined by packing it in a mini-column, passing a metal solution through it and measuring metal ions in the effluent by ICP-MS. The cross-linked chitosan adsorbed mercury and precious metals (Pd, Pt, and Au) at pH values from acidic to neutral. Especially, mercury in concentrated hydrochloric acids could be adsorbed on cross-linked chitosan quantitatively by an anion-exchange mechanism in the form of a stable chloride complex. This method was applied to the removal of mercury from commercially available hydrochloric acid; more than 97% of mercury was removed, and the residual mercury in the hydrochloric acid (Grade: for trace analysis) was found to be 0.15 ppb. Mercury adsorbed on the cross-linked chitosan could be easily desorbed with an eluent containing 1 M hydrochloric acid and 0.05 M thiourea. The thus-refreshed cross-linked chitosan could be repeatedly used for the removal of mercury in hydrochloric acid.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushimanaka, Okayama, 700-8530, Japan

    Koji Oshita, Mitsuko Oshima, Kyue-Hyung Lee & Shoji Motomizu

  2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100101, China

    Yun-hua Gao

Authors
  1. Koji Oshita
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  2. Mitsuko Oshima
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  3. Yun-hua Gao
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  4. Kyue-Hyung Lee
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  5. Shoji Motomizu
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Oshita, K., Oshima, M., Gao, Yh. et al. Adsorption Behavior of Mercury and Precious Metals on Cross-Linked Chitosan and the Removal of Ultratrace Amounts of Mercury in Concentrated Hydrochloric Acid by a Column Treatment with Cross-Linked Chitosan. ANAL. SCI. 18, 1121–1125 (2002). https://doi.org/10.2116/analsci.18.1121

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  • DOI: https://doi.org/10.2116/analsci.18.1121

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