湿法消解-原子吸收光谱法测定紫山药中矿质元素

Determination of Mineral Elements in Dioscorea alata L. Tubers by Atomic Absorption Spectrometry with Wet Digestion

以福建省武平县和云南省红河州紫山药块根为实验材料,采用湿法消解-原子吸收光谱法对其中12种矿质元素含量进行分析检测。结果表明：湿法消解-原子吸收光谱法能准确测定紫山药中矿质元素的含量,回收率在92.00%~106.00%之间,相对标准偏差在10%以下,且方法简单、快捷;供试的紫山药中矿质元素含量丰富,不仅富含Mg、Fe、Zn,还含有对人体有益的Se元素。重金属中除了Ni元素,其他重金属（Cr、Pb、As、Cd、Hg）的含量均符合GB 2762—2012《食品中污染物限量》。

The contents of 12 mineral elements in Dioscorea alata L. tubers from Wuping county of Fujian province and Honghe prefecture of Yunnan province were analyzed by atomic absorption spectrometry（AAS） after wet digestion. The results showed that the AAS method was a simple and fast method that provided accurate measurement of mineral elements in Dioscorea alata L. tubers with recoveries ranging from 92.00% to 106.00% and relative standard deviation below 10%.The tested samples were found to be rich y in Mg, Fe and Zn as well as Se, which is beneficial to the human body. Except for Ni, the contents of all heavy metals including Cr, Pb, As, Cd, and Hg are in line with the national food safety standards for the maximum limits of contaminants in foods.