微波消解-石墨炉原子吸收法测定壳聚糖中的痕量镉

GFAAS Determination of Trace Amount Cadmium in Chitosan by Micro Wave

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 - H2 SO4 HClO4体系、HNO3- H2 O2 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 ,2mLHClO4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10 0 0℃,原子化温度2 2 0 0℃。该方法相对标准偏差为2 8% ,回收率在97 0 %～10 6 3%之间,该方法快速、简便、准确。

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.