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ID 19940
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Author
Oshita, Koji
Oshima, Mitsuko
Gao, Yun-hua
Lee, Kyue-Hyung
Motomizu, Shoji
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 crosslinked chitosan could be repeatedly used for the removal of mercury in hydrochloric acid.
Published Date
2002-10-10
Publication Title
Analytical Sciences
Volume
volume18
Issue
issue10
Publisher
日本分析化学会
Start Page
1121
End Page
1125
ISSN
0910-6340
NCID
AA10500785
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
Copyright Holders
日本分析化学会
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DOI