微波消解-原子吸收法测定西藏酥油中7种元素

通过改变消化温度、消化时间及消化压力三因素设计正交试验,对样品西藏酥油进行微波消化,用火焰原子吸收光谱法对西藏酥油中的Ca,Mg,K,Na,Cu,Zn,Fe 7种元素进行测定。结果表明:最适消化条件为消化温度160℃、消化时间4 min、消化压力2.53 MPa。在最适实验条件下,对酥油中各元素的含量作了加标回收实验,回收率范围在92.4%～105.3%,相对标准偏差0.12%～3.27%(n=6);该方法准确、快速、简便。

Determination of 7 Elements in Xizang Ghee by Microwave Digestion-Atomic Absorption Spectrometry

In this paper, orthogonal design test was planed by changes digestion temperature, digestion time, and digestion pressure. Xizang ghee was digested by microwave digestion method. The contents of elements Ca, Mg, K, Na, Cu, Zn and Fe, were determined by flame atomic absorption spectrometry. The optimum conditions for the di- gestion was obtained as follows：temperature was 160 ℃,digestion time was 4 min and digestion pressure was 2.53 MPa, respectively. The recovery ratio of the method was in the range of 92.4% - 105.3% , and the relative standard deviations were 0.12% - 3.27% （n = 6）. The method is accuracy, celerity, and simple.