【摘要】 目的 :以夏枯草、薯蓣为例 ,探查铅 (Pb)、镉 (Cd)、汞 (Hg)、砷 (As)在药用植物不同部位的分布。方法 :采用湿法消化 ,原子吸收分光光度法测定Pb、Cd ,原子荧光法测定Hg、As。结果 :夏枯草和薯蓣不同部位都含有Pb、Cd、Hg、As ,其中Pb的含量最高 ,两植物中 4种重金属元素的含量高低顺序均为 :Pb >As≥Cd >Hg ;Pb和Hg在不同部位的含量分布高低顺序是 :叶 >根 >茎 >果穗 ;Cd在两植物根部含量分布最高 ;As在两植物中有不同的分布。结论 :Pb和Hg主要分布在吸收部位 ,叶受其污染最为严重 ;Cd主要贮存于 2种植物的根部 ;果穗中重金属含量分布最低。更多还原

【Abstract】 Objective:Taken prunella vulgaris and discorea opposita as example,to investigate the distribution of lead(Pb),cadmium(Cd),mercury(Hg) and arsenic(As) in medicinal herbs.Method:The dissolution of the herbs media were performed in wet way.The four heavy metal elements in the herbs were determined by atomic absorption spectrometry and atomic fluorescence spectrometry respectively.Result:The contents of the elements was Pb>As≥Cd>Hg.There were more Pb and Hg in the leaf and root than in the stem and fruit.The distribution of Pb and Hg in the two different herbs were largely identical.Conclusion:Pb and Hg were concentrated on the absorbing parts,the leaf was badly contaminated.There was the most amount of Cd in the root and the less amount of the four heavy metal elements in the fruit.更多还原