流动注射在线萃取—火焰原子吸收光谱法测定人发中微量镉和铅

本文建立了一个流动注射在线萃取－火焰原子吸收测定人发中微量镉和铅的方法，对含Ｃｄ和Ｐｂ分别为０．０２μｇ／ｍｌ和０．２０μｇ／ｍｌ的溶液，其相对标准偏差分别为３．４％和３．８％（ｎ＝９），Ｃｄ和Ｐｂ的灵敏度分别提高２１倍和２３倍，分析速度达３６次／ｈ，Ｃｄ和Ｐｂ的回收率分别在８７．３％－９７．０％和９１．９％－１０７．３％之间，文中还详细研究了各种实验参数的选择，测定人发样的结果与文献值相符。

DETERMINATION OF TRACE AMOUNT OF CADMIUM AND LEAD IN HUMAN HAIR USING A FLOW INJECTION FAAS SYSTEM WITH ON-LINE PROCONCENTRATION

In this paper,a method to detect trace amount of cadmium and lead in human hair is developed by coupling the flow injection analysis technique with flame atomic absorption spectrometry (FAAS). In acidic solution cadmium and lead are extracted into methyl isobutyl ketone (MIBK) by ammonium pyrrolidineder thiocarbonat (APDC) in the extraction coil and detected by FAAS. The sensitivity of determination and sampling frequency may be imporved greatly. At the same time possible interferences may be removed effectively. The R. S. D. (%) is 3. 4 (n = 9) (0. 20ng/ml) respectively. The sensitivity may be increased 21 times for Cd and 23 times, for Pb. The recovery of cadmium and lead are 87. 3%-97. 0% and 91. 9%-107. 3% respectively. Choices of experimental parameters are investigated in detail, the results obtained with some hair samples are coincident with the values from literature.