大试管回流消解-等离子体发射光谱/质谱法测定植物样品中多元素

Determination of Major and Trace Elements in Plant Samples by Inductively Coupled Plasma-Atomic Emission Spectrometry/Mass Spectrometry with Sample Reflux Digestion

采用大试管和红外加热的多孔控温消解炉的简单装置消解植物样品,电感耦合等离子体发射光谱/质谱法测定其中的主量和痕量元素,对消解温度、消解时间、消解溶剂、样品取样量等条件进行考察。用植物国家一级标准物质进行前处理及测定,验证方法的可行性,测定值与标准值基本吻合。方法不仅能同时测定B、Ba、Ca、Cd、Cu、K、Mg、Mn、Na、Ni、P、S、Zn、Co、Sr、Pb、Cr等元素,还适用于Hg、As挥发性元素的消解测定。方法的精密度(RSD,n=10)≤10%。

Plant samples were digested with big reflux test tube and infrared heating furnace and the major and trace elements were determined by inductively coupled plasma-atomic emission spectrometry/mass spectrometry （ICP-AES/MS）. Some important analytical parameters, including selection of the digestion solvents, digestion temperature and time, sample mass digested, and so on were discussed and optimized. The method has been applied to the simultaneous determination of B, Ba, Ca, Cu, K, Mg, Mn, Na, Ni, P, S, Zn, Co, Sr, Pb, Cr and volatile elements such as As and Hg in National Standard Reference plant samples. The results are in good agreement with the certified values with precision of less than 10% RSD（n = 10）.