原子吸收解吸仪分离测定食品中镉

Separation and Measure of Cadmium in Food with Atmotic Absorption-Desorption Meter

应用ＹＡＥ—２原子吸收解析仪自动萃取食品中的镉．结果表明，镉在ＰＨ８～９的氨缓冲溶液存在的条件下被ＥＤＴＡ富集柱富集，用 １ｍｏｌ／Ｌ硝酸溶液作洗脱载液，测定食品镉含量在 １００～２０００μｇ／ｋｇ之间时，线性关系成立．标准差为０．００４２ ｍｇ／ｋｇ，均值为 ０．２１７ ｍｇ／ｋｇ，变异系数 １．９３％．检出限为 ５ μｇ／Ｌ．本方法适用于各种食品中镉的分析，是一种在线高速解吸的分离分析技术．

YEA-2 atmotic absorption-desorption meter was used in this paper to automatically abstract the cadmium in food. The results show that the cadmium was enriched by EDTA enrichment column in ammonia buffer solution(pH8~9). We used 1 mol. L HNO3 solution as the elution caner,when cadmium in food was at 100-2000 μg/kg,thecontent and the maximum value of absorption were in line. When the contont of cadmium is food was 0. 5 mg/μg;the standard deviation was 0. 042 mg/kg the average value was 0. 217 mg/kg;the coefficient of variabillity was 1. 93% 3the limitation was 5 ug/L The method has good degree of accuracy,rapid analytical speed,high sensitivith and wide linear range. It's applicable to the analysis of cadmium in ail kinds of food.