微波消解-ICP-AES法测定鬼箭羽中微量元素

鬼箭羽(又称卫矛)中富含铁、钙、镁等多种微量元素.采用微波消解的方法处理鬼箭羽样品,并用原子吸收光谱法(AAS)和等离子体电感耦合-原子发射光谱法(ICP-AES)测定了其中Ca,Mg,Zn和Fe等十种微量元素的含量.考察了消解过程中消解混酸体系的种类、消解液体积和样品质量比、硝酸-其他酸体积比、样品粒度等四个因素对消解结果的影响,利用正交试验法确定了最优的消解条件.在HNO3-HCl体积比2:1,液固比100:1,样品粒度100～140目的最佳条件下,进行了精密度实验,所得结果的相对标准偏差在0.5%～6.2%之间;回收率在85.8%～105.6%之间.实验结果表明,微波消解-AAS和ICP-AES法能够快速、准确、简便地测量鬼箭羽中Ca,Mg,Zn和Fe等微量元素的含量.

Determination of Elements in Euonymus Alatus by Microwave Digestion-ICP-AES

The determination of elements in Euonymus alatus by ICP-AES was carried out in the present paper. The Euonymus alatus samples were digested by microwave digestion technique. The optimized conditions of microwave digestion procedure obtained by orthogonal array design were as follows: the volume ratio of HNO3-HCl is 2 : 1; the ratio of liquid/solid is 100 : 1; the sample particle size is 100-140 mesh. ICP-AES method was applied to the determination of ten trace elements in the sample, and was compared with AAS. The results showed that the method was rapid and simple with the relative standard deviations between 0.5%-6.2%, and the recovery between 85.5% and 105.6%.