石墨炉原子吸收光谱法测定2种植物叶中重金属含量

Determination of Pb,Cd and Cr Content in 2 Plant-Leaves by Using Graphite Furnace Atomic Absorption Spectrometry

本文采用石墨炉原子吸收光谱法分别测定茶叶和银杏叶2种植物叶中Pb、Cd和Cr等3种重金属含量,首先对干的叶子做预处理,然后采用微波消解,最后用石墨炉原子吸收法分别测定消解样品中Pb、Cd和Cr三种元素的含量。茶叶、银杏叶中铅的含量分别0.459 mg/kg、2.45 mg/kg,镉的含量分别为0.0425 mg/kg、1.22 mg/kg,铬的含量分别为0.461 mg/kg、5.18 mg/kg,三种元素的加标回收率均在92.0%-97.3%,相对标准差均小于2.5%。表明利用石墨炉原子吸收测定茶叶、银杏叶中的铅、镉和铬的分析方法是准确的。

To investigate the method of graphite furnace atomic absorption spectrometry to determine the Pb,Cd and Cr content in 2 Plant-Leaves.The tea leaves and Ginkgo biloba were digested for corresponding pretreatment,the content of Pb,Cd and Cr in 2 Plant-Leaves were determined.The experimental results indicated that the content of Pb,Cd and Cr in tea leaves was 0.459 mg/kg,0.0425 mg/kg,0.461 mg/kg,the content of Pb,Cd and Cr in Ginkgo biloba was 2.45 mg/kg,1.22 mg/kg,5.18 mg/kg,the recovery rate was 92.0%~97.3%,the RSD<2.5.This method to determine the Pb,Cd and Cr content is accurate,and it can be utilized todetermine Pb,Cd and Cr content in the Tea leaves and Ginkgo biloba.