直接进样石墨炉原子吸收法测定动物脏器中微量铅

Determination of Trace Lead in Animal Organs Using Direct Sampling flameless Atomic Absorption Spectrophotometry

本文描述了一种直接进样原子吸收测定动物脏器中微量铅的方法。动物脏器被预先捣碎至一定微粒,然后配置成悬浊液直接被注入石墨原子化器进行分析。由于不经过样品消解、分离与富集等操作,铅损失的可能性大大减小。整个过程几乎不用其他化学试剂,因而可避免因使用化学试剂而带进的污染。实验中研究了颗粒度、石墨炉工作温度等因素对结果的影响。用该法对几种动物脏器的分析证明,方法的分析精度可达3.5—8.6％,加入回收率在90—108％之间。本法可作为一种测定动物样品中痕量金属元素的快速、简便的分析方法。

The animal organs were ground to be very fine particles, with which suspended solution was prepared and then it was analyzed in graphite atomizer by direct sampling. Because the whole procedure would be completed without sample dissolution, separation and concentration, and no reagents were used during sample preparation, the samples so were avoided from contamination. In the experiment, several parameters were investigated, for example, the effects of particle sizes of the samples and of temperature program of atomizer. The results showed that the precision of this method for analyzing different animal organs covered a range of 3.5-8.6% and recovery ratio a range of 90-108% with spiked 20-60 ng/ml of lead.