微波消解-FAAS法测定五种坚果中微量元素的研究  

Microwave Digestion-FAAS Determination of Trace Elements in Five Kinds of Nuts

作　　者：魏国涛[1] 王亦军[1] 高翠丽[1] 贾彩云[1] 王心伟[1] 朱安宁[1] 

机构地区：[1]青岛大学化学化工与环境学院,山东青岛266071

出　　处：《广东微量元素科学》2012年第11期16-21,共6页Trace Elements Science

摘　　要：以微波消解法处理样品、采用火焰原子吸收光谱法对花生、核桃、榛子、板栗、杏仁五种坚果中的Mg、Ca、Zn、Mn、Fe等5种元素的含量进行了分析,探讨了微波消解的最佳条件。结果表明,所用消解液体系为V(HNO3)+V(H2O2)=4+1,消解程序第一步压力和时间分别为0.5 MPa和60 s,第二步压力和时间分别为2.1 MPa和300 s时,消解效果最好;方法的加标回收率在97.30%～102.2%之间,相对标准偏差(n=5)小于3.36%。坚果元素含量测定结果表明:五种坚果中含有丰富的微量元素,尤以Mg、Ca的含量为高,Mg达到2 000μg/g左右,Ca约300μg/g左右,其次是Fe、Zn、Mn等。With microwave digestion, the five trace elements of Mg, Ca, Zn, Mn, Fe were determined by using flame atomic absorption spectrometry （FAAS） in the five samples which included peanut, walnut, hazelnut, chestnut and almond. The optimum conditions of microwave digestion was expounded, and the results showed that the digesting solution system for V（ HNO3 ） ＋ V（ H202 ） = 4 ＋ 1 is the optimum choice and the best digestion effect will be achieved when the pressure and the time were 0.5 MPa and 60 s respectively in the first step of digestion, and 2. 1 MPa and 300 s in the second step. The recovery of this method ranged from 97.30% - 102.2%, and the relative standard deviation was less than 3.36% （n = 5 ）. The detection result of element content in nuts showed that five nuts are rich in trace elements , especially Mg and Ca, with Mg g, followed by Fe, Zn, Mn etc.. reaching about 2 000 μg/g, and Ca about 300 μg/

关 键 词：微波消解 火焰原子吸收光谱法 坚果 微量元素 

分 类 号：O657.31[理学—分析化学]