食品科学 ›› 2007, Vol. 28 ›› Issue (6): 285-287.

• 分析检测 • 上一篇    下一篇

微波消解-原子吸收法快速测定莼菜中铜、锌的含量

 周志, 唐巧玉, 汪兴平, 罗祖友, 胡丹   

  1. 湖北民族学院生物科学与技术学院; 湖北民族学院湖北省生物资源保护与利用重点实验室; 湖北民族学院生物科学与技术学院 湖北恩施445000; 湖北恩施445000;
  • 出版日期:2007-06-15 发布日期:2011-12-31

Determination of Zinc and Copper in Brasenia schreber J.F.Gmel by Microwave Digestion and Atomic Absortion Spectrometry

 ZHOU  Zhi, TANG  Qiao-Yu, WANG  Xing-Ping, LUO  Zu-You, HU  Dan   

  1. 1.School of Biological Science and Technology, Hubei Institute for Nationalities, Enshi 445000, China; 2.Key Laboratory of Biologic Resources Protection and Utilization, Hubei Institute for Nationalities, Enshi 445000, China
  • Online:2007-06-15 Published:2011-12-31

摘要: 应用微波消解制备系统,对莼菜湿样中铜、锌元素进行了微波消解研究,并采用原子吸收法测定其元素的含量。通过L9(34)正交设计,讨论了HNO3/H2O2比、固液比、消解时间、微波功率对微波消解结果的影响。最佳的消解条件为:HNO3/H2O2(V/V)=1:1,固液比(g/ml)=1:12,消解时间为6min,微波功率为700W。在最佳微波消解条件下,进行了精密度实验、回收率实验和金属离子干扰实验。结果表明,所得铜的回收率在97.60%~102.80%之间,RSD为4.61%;锌的回收率在98.40%~101.80%之间,RSD为6.19%。微波消解法处理莼菜湿样,具有快速、简便、节约试剂、消解完全等特点,测定结果的精密度、准确度令人满意。

关键词: 微波消解, 原子吸收, 莼菜, 铜,

Abstract: Using the microwave digestion system, the zine and copper in Brasenia schreber J.F.Gmel were determined by microwave-digestion atomic absortion spectrometry in this paper. Using L9(34)orthogonal experiment, the effects of the ratio of HNO3 to H2O2, the ratio of the sample to digestion solution, the digestion time and the digestion power were studied. The optimum digestion conditions are: HNO3/H2O2 (V/V) 1:1, sample/solution (g/ml) 1:12, the digestion time 6 min and the microwave power 700 W. Under the optimum digestion conditions, it is satisfactory to apply the microwave digestion procedure to determine respectively zine with the recovery of 98.40%~101.80% and the RSD of 6.19%, and copper with the recovery of 97.60%~ 102.80% and the RSD of 4.61%. The results showed that this method is rapid and simple with low reagent consumption and complete digestion.

Key words: microwave digestion, atomic absorption spectrometry, Brasenia schreber J.F.Gmel, copper, zinc