预富集-石墨炉原子吸收光谱法测定药食两用中药浸泡液中痕量镉  

Determination of Cadmium in Decoction Fluid of the Medicine Food Dual Purpose Chinese Native Medicine by Silica Gel Suspension Introduction Graphite-furnace Atomic Absorption Spectrometry after Enrichment

作　　者：杨献珍[1] 陈学泽[1] 沈银梅[1] 

机构地区：[1]中南林业科技大学理学院,湖南株洲412006

出　　处：《食品与生物技术学报》2007年第2期49-52,共4页Journal of Food Science and Biotechnology

摘　　要：提供了预富集-石墨炉原子吸收光谱法测定药食两用中药浸泡液中的痕量镉的新方法。采用吡咯烷二硫代氨基甲酸铵(APDC)作配位剂,在pH 5.0-8.0的条件下,用固体硅胶捕集、抽滤分离Cd-APDC配合物,然后用1 moL/L盐酸从膜滤纸上洗下硅胶,得到能够直接用石墨炉原子吸收光谱法测定的镉悬浊液。该法简便快速,富集100倍时的特征质量为2.8×10-14g。用此方法测定4药食两用中药浸泡液中的痕量镉,当n=5时,标准偏差为0.002 5-0.005 8,RSD为:0.012-0.052,样品的加标回收率为91.8%和111.1%,结果较为满意。A simple and sensitive method has been developed for the determination of cadmium in decoction fluid of medicine food dual purpose Chinese native medicine. The cadmium was fixed on finely divided silica gel as the complex with ammonium pyrrolidinedithiocarbamate （APDC） and the silica gel was collected on a membrane filter by filtration under suction, then wash down the silica gel used 1 moL/L hydrochloric acid from membrane filter paper and the suspension was directly used for the determination by Graphite-furnace Atomic Absorption Spectrometry. Quality feature is 2.8× 10^-14g/1%. When n ： 5, standard deviation （SD） of these samples were from 0.0025to 0. 0058 , （SD） of these samples were between 0. 012 and 0. 052 and recoveries added were 91.8% and 111.1% ,the results were comparatively satisfied .

关 键 词：镉 药食两用中药 预富集 石墨炉原子吸收光谱法 

分 类 号：R284[医药卫生—中药学]