Synthesis of dithiocarbamate-chitosan resin and its adsorption behavior for trace metals

被引:15
|
作者
Ninomiya, T [1 ]
Oshita, K [1 ]
Oshima, M [1 ]
Motomizu, S [1 ]
机构
[1] Okayama Univ, Fac Sci, Dept Chem, Okayama 7008530, Japan
关键词
chitosan resin; dithiocarbamate; heavy metals; elution method; preconcentartion;
D O I
10.2116/bunsekikagaku.52.811
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A chitosan-based resin possessing the dithiocarbamate moiety (DTC-chitosan resin) was synthesized using cross-linked chitosan as a base material. The adsorption behavior of trace metal ions on the DTC-chitosan resin was systematically examined by packing it in a mini-column (1 ml of the resin) and measuring the recovery by ICP-MS. The resin could adsorb almost 100% of 7 kinds of metals(Cu, Mo, Ag, Te, W, Hg and Bi) at pH ranges from acidic to neutral. However, elution of these metals from the resin-was difficult. In this study, we improved the recovery efficiency by a pretreatment of the resin: the resin was added to 100 ml of a 0.1 M copper sulfate solution, stirred for 24 h and washed sufficiently with I M nitric acid and water. With this pretreatment, metals adsorbed on 1 ml of the resin were readily eluted with I M nitric acid (10 ml). This method was applied to the determination of metals in river-water samples; the RSDs (10-fold preconcentration) were within 5%.
引用
收藏
页码:811 / 817
页数:7
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