摘要
本文研究中药和食品中锗的间接测定方法。先在盐酸介质中用四氯化碳萃取锗，使其与干扰元素分离，在一定条件下锗与钼酸铵反应生成锗钼酸，再用ＭＩＢＫ萃取，用ＦＡＡＳ法测定有机相中钼的办法间接测定锗。因ＦＡＡＳ法测钼的灵敏度是锗的五倍以上，且一个Ｇｅ与十二个Ｍｏ接合，加上有机溶剂提高灵敏度的作用，故此法极大地提高测定锗的灵敏度，是中药和食品中微量锗测定的实用方法。
Indirect determination of trace Ge in Chinese medicines and foods was studied in this paper.Germaniurn was extracted from medium of HCl into CCl4 phase and was separated from interference elements.Then the amrnonium molybdate was added to sample solution.The heteropolymobdate of germanium was formed in the acidity of 0.5mol/L and was extracted into MIBK phase.Indirect determined germanium was achieved with determination ofmolybdenum in MIBK phase by FAAS.The advantages of this method are of very high sensitivity and selection.Because the first is more 5 times of the sensitivity of determined Mo than Ge by FAAS.The second is 1: 12 of mole raction of Ge to Mo in the heteropolybdate and the third is better sinsitivity in MIBK phase than in water phase. RSD of extraction and determination is 6. 8 %. Recovery ratio is between 94-- 108 %. Determined values of Ge in samples are In good agreement with other methods. This study has demonstrated that this method can be used to separate and determine Ge in practical samples of Chinese medicines and foods.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1996年第3期93-98,共6页
Spectroscopy and Spectral Analysis
关键词
原子吸收光谱
中药
食品
锗
Indirect determination, FAAS, Chinese medicine, Food, Ge
