凯里地区天胡荽中微量元素含量的测定

Determination of Trace Elements in Hydrocotyle sibthorpioides Lam.of Kaili

[目的]测定凯里地区天胡荽(Hydrocotyle sibthorpioides Lam.)样品中微量元素的含量。[方法]采用微波消解-火焰原子吸收光谱法(FAAS)、氢化物原子发生荧光光谱法(HG-AFS)测定天胡荽中Zn、Cu、Fe、Mn、Se 5种微量元素的含量。[结果]凯里下司地区的不同颜色的天胡荽含有丰富的人体必需微量元素Zn、Cu、Fe、Mn、Se,且含量依次是Fe>Mn>Zn>Cu>Se;其中绿色天胡荽中Zn、Cu、Fe、Mn的含量几乎是红色天胡荽含量的2倍,而Se含量差异不大,所测Se含量均大于0.110μg/g,属于高硒植物。所测元素回收率在98.1%～104.2%之间,RSD在0.01%～2.22%之间。[结论]该研究为当地天胡荽药用价值的科学评价提供了依据。

[Objective] To determine the trace elements in Hydrocotyle sibthorpioides Lam.of Kaili.[Method] The contents of five trace elements including Zn,Fe,Cu,Mn and Se in Hydrocotyle sibthorpioides Lam.were determined by flame atomic Absorption spectrometry（FAAS） and hydride generation atomic fluorescence spectrometry（HG-AFS）.[Result] Different colors of Hydrocotyle sibthorpioides Lam.from Xiasi of Kaili was rich in Zn,Fe,Cu,Mn and Se which were essential to human body,the contents of 5 trace elements decreased according to the following order Fe〉Mn〉Zn〉Cu〉Se;and the contents of Zn,Cu,Fe and Mn in green Hydrocotyle sibthorpioides Lam.were almost twice of that in red Hydrocotyle sibthorpioides Lam.,Se content changed insignificantly and the measured Se contents were all above 0.110 μg/g,therefore Hydrocotyle sibthorpioides Lam.was high selenium plants.The recoveries and relative standard deviation（RSD） of these trace elements were among 98.1 %-104.2 % and 0.01%-2.22%,respectively.[Conclusion] This research provided scientific basis for evaluating the medical value of local Hydrocotyle sibthorpioides Lam.