交联壳聚糖在痕量金预富集、分离中的应用研究  

Application Studies of Crosslinked Chitosan in Preconcentration and Separation of Trace AuⅢ

作　　者：王昊云[1] 钱沙华[1] 莫少波[2] 黄淦泉[1] 

机构地区：[1]武汉大学资源与环境科学学院,武汉430079 [2]武汉大学化学与分子科学学院,武汉430072

出　　处：《分析化学》2005年第2期198-200,共3页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.20277028);湖北省自然科学基金(No.2002AB059)资助项目

摘　　要：研究了交联壳聚糖(CCTS)对于金的吸附性能,提出了用CCTS作为富集剂,预富集、分离水样中痕 量Au 的新方法。研究结果表明:在pH为4.0,吸附25min的条件下,CCTS对金的吸附率达99.0%;采用 2.5%(W/V)的硫脲溶液可将吸附在CCTS上的金定量洗脱。将CCTS用于水中痕量金的预富集,富集倍数达 20倍;用火焰原子吸收光谱法(FAAS)检测,检出限(3σ,n=6)为0.088mg/L;相对标准偏差(RSD)小于 5.9%;回收率在92%～102%之间。所提出的预富集方法具有简便、快速、选择性好等特点。The adsorption properties of crosslinked chitosan (CCTS) for Au were studied and a new method for preconcentration and separation of Au was proposed. The adsorption rate of Au by CCTS was 99.0% at pH 4.0 and Au could be eluted from CCTS with thiourea of 2.5%(W/V). The Au in water was preconcentrated with CCTS and determination by flame atomic absorption spectrometry(FAAS), it can be enriched about 20 times, the detection limit (3σ,n=6) was 0.088 mg/L, the relative standard deviation(RSD) was less than 5.9%. and recoveries were 92%~102%. This preconcentration method is simple, quick and has good selectivity.

关 键 词：预富集 痕量 交联壳聚糖 相对标准偏差 检出限 吸附性能 FAAS 水样 吸附率 洗脱 

分 类 号：O658[理学—分析化学]