电感耦合等离子体发射法同时测定苘麻不同部位的7种元素含量

Simultaneous determination of contents of seven trace elements in different parts of Abutilon theophrastii by inductively coupled plasma optical emission spectrometry method

目的：测定苘麻的根、茎、叶、种子、种壳中Cr、Cd、As、V、Ni、Li和Pb共7种元素的含量。方法：将苘麻各部位经硝酸-高氯酸（4∶1,V/V）浸泡过夜,次日置电热板上300℃消解处理后,采用电感耦合等离子体发射光谱法（ICP-OES）测定。结果：Cr、V、Ni、Li、Pb的平均含量,苘麻根中分别为9.39、3.16、1.17、1.02和0.52μg/g;茎中分别为8.06、2.00、1.04、0.49和0.79μg/g;叶中分别为6.20、3.83、1.07、1.11和1.78μg/g;种壳中分别为7.69、2.74、1.32、0.49和2.13μg/g,Cd、As均未检出。种子中Cr、V、Ni、Li平均含量分别为4.45、1.54、1.84和0.56μg/g,Cd、As、Pb未检出。方法的加样回收率为90.53%-105.73%（n=9）,RSD〈4.73%。结论：本研究首次采用ICP-OES法测定苘麻不同部位中7种元素含量,为今后进一步研究苘麻积累了资料。该测定方法简单易行,方便快捷,结果令人满意。

Objective：To determine the contents of metal elements Cr,Cd,As,V,Ni,Li and Pb in roots,stems,leaves,fruits and exocarps of Abutilon theophrastii Medic..Methods：Different parts of Abutilon theophrastii Medic.were dipped in HNO3-HClO4（4∶1,V/V） overnight.On next day,the samples were determined by inductively coupled plasma optical emission spectrometry（ICP-OES） after digested on electric heating plate at 300 ℃.Results：The contents of Cr,V,Ni,Li and Pb were 9.39,3.16,1.17,1.02 and 0.52 μg/g in roots;8.06,2.00,1.04,0.49 and 0. 79 μg/g in stcms;6. 20,3. 83,1. 07,1.11 and 1. 78 μg/g in leaves;7. 69,2. 74, 1. 32.0. 49 and 2. 13 μg/g in exocarps,respectively,while Cd and As were not detected. The contents of Cr,V,Ni,Li＋in seeds were 4.45,1.54,1.84 and 0.56 μg/g, respectively. Cd,As and Pb were not detected in the sceds of Abutilon theophrastii Medic. The recovery of additional sample was 90.53 %-105. 728% （n = 9）, RSD〈E 4.73%. Conclusion： In this research,ICP-OES method is used to determine seven trace elements in different parts of Abutilon theophrastii Medic. for the first lime. The method is quick, simple and convenient and the results are satisfactory.