火焰原子吸收法测定红花龙胆中重金属元素含量

Contents of Heavy Metal Elements in Gentiana rhodantha by Flame Atomic Absorption Spectrometry

为了解贵州少数民族药红花龙胆中重金属（Mn,Zn,Pb,Cu,Cr,Cd,Ni）的含量,采用HNO3HClO4（5∶1）体系消解样品,火焰原子吸收光谱法测定红花龙胆中7种重金属元素含量.结果表明：红花龙胆中Zn、Cu、Cd、Mn、Ni、Cr、Pb重金属含量分别为51.45 μg/g,9.64 μg/g,0.28 μg/g,62.79 μg/g,6.39 μg/g,5.60 μg/g,12.26 μg/g,7种重金属元素的含量大小依次为Mn＞Zn＞Pb＞Cu＞Ni＞Cr＞Cd.加标回收率在96.7％～105.2％,RSD为0.46％～2.26％,该法快速、简便、灵敏、准确,可用于红花龙胆中重金属元素的分析.

In order to know the contents of heavy metal elements（Mn,Zn,Pb,Cu,Cr,Cd and Ni） in G.rhodantha,the samples were digested with HNO3-HClO4 system and then flame atomic absorption spectrometry was adopted to determine the contents of seven heavy mental elements.The results showed the contents of the seven heavy mental elements in G.rhodantha from high to low were Mn〉Zn〉Pb〉 Cu〉Ni〉Cr〉Cd.The additional standard recoveries of sample was 96.7%～105.2% with RSD （n=5） of 0.46%～2.26%.The established method was fast,simple,sensitive,precise and accurate,which could be used for detecting heavy metal elements in G.rhodantha.