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微波消解-石墨炉原子吸收法测定壳聚糖中的痕量镉
引用本文:翁棣,翟国庆.微波消解-石墨炉原子吸收法测定壳聚糖中的痕量镉[J].光谱学与光谱分析,2005,25(4):567-569.
作者姓名:翁棣  翟国庆
作者单位:浙江大学环境与资源学院,浙江,杭州,310029
基金项目:国家自然科学基金 (2 0 2 4 70 0 1 )资助项目
摘    要:采用石墨炉原子吸收法直接测定了壳聚糖中的痕量镉。试验发现,在HNO3-H2SO4-HClO4体系、HNO3—H2O2体系、HCl-HNO3体系、HF-HClO4体系中,以HF-HClO4体系消化效果最佳,经试验,0.2g样品用1mLHF,2mL HClO4消溶效果较好。以HF-HClO4体系为消化试样、微波消解,用Pd(NO3)2作基体改进剂,灰化温度1000℃,原子化温度2200℃。该方法相对标准偏差为2.8%,回收率在97.0%~106.3%之间,该方法快速、简便、准确。

关 键 词:石墨炉原子吸收法  微波消解  痕量镉  壳聚糖  相对标准偏差  HClO4  基体改进剂  原子化温度  直接测定  H2O2  HNO3  灰化温度  回收率  试验  消化  试样
文章编号:1000-0593(2005)04-0567-03
修稿时间:2003年9月24日

GFAAS Determination of Trace Amount Cadmium in Chitosan by Micro Wave
Weng Di,ZHAI GUO-QING.GFAAS Determination of Trace Amount Cadmium in Chitosan by Micro Wave[J].Spectroscopy and Spectral Analysis,2005,25(4):567-569.
Authors:Weng Di  ZHAI GUO-QING
Institution:School of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China.
Abstract:In this work, a method had been developed for determination of cadmium in chitosan by means of graphite furnace atomic absorption spectrometry with micro wave digestion, a systematic study was carried out by selection of the most appropriate working conditions and optimization of the sample mass. The samples were digested by micro wave with mixed acid of HF-HClO4 (1:2). Trace amount cadmium has been determined by Graphite Furnace Atomic Absorption Spectrometry (GFAAS) with Pd(NO3)2 as a matrix modifier. If appropriate working conditions are chosen, the method finally proposed shows interesting features for the determination of the analytics in the samples such as: suitable precision values (R. S. D--2.8%) and the recover rate by standard addition is 97.0%-106.3%. The method is simple, rapid and with accurate results.
Keywords:Micro wave digestion  Graphite furnace atomic absorption spectrometry  Chitosan  Cadmium
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