交联壳聚糖在锑形态分析中的应用

Application of Cross-linked Chitosan in Speciation Analysis of Antimony

研究了交联壳聚糖（ＣＣＴＳ）对Ｓｂ（Ⅲ）－吡咯烷二硫代氨基甲酸铵（ＡＰＤＣ）和Ｓｂ（Ⅴ）－ＡＰＤＣ的吸附行为，并探讨了吸附机理。结果表明：在ｐＨ＝２时Ｓｂ（Ⅲ）－ＡＰＤＣ和Ｓｂ（Ⅴ）－ＡＰＤＣ的吸附率分别为９６％和９８％。吸附后，利用Ｓｂ（Ⅲ）和Ｓｂ（Ⅴ）形成氢化物的不同条件分别测定，建立了氢化物发生原子吸收（ＨＧＡＡＳ）测定水中痕量Ｓｂ（Ⅲ）和Ｓｂ（Ⅴ）的方法。该法的检出限为６０ｎｇ／Ｌ，回收率为９５％～１０７％，相对标准偏差为２１％～５６％。

The adsorption of Sb(Ⅲ)_and Sb(Ⅴ)_ ammonium pyrrolidine dithiocarbamates (APDC) on cross_linked chitosan (CCTS) has been studied,and its mechanism is discussed.The adsorption rates of Sb(Ⅲ) and Sb(Ⅴ) are 96% and 98%,respectively.By changing conditions of hydride formation,Sb(Ⅲ) and Sb(Ⅴ) can be determined separately by AAS after their conversion to SbH3.A new method for the determination of aqueous Sb(Ⅲ) and Sb(Ⅴ) by hydride generation and subsequent atomic absorption spectrometry determination is proposed.The detection limit is 60 ng·L-1.The recovery is 95%～107%,while the relative standard deviation is in the range of 21%～56%.