食品科学 ›› 2012, Vol. 33 ›› Issue (12): 247-249.doi: 10.7506/spkx1002-6630-201212050

• 分析检测 • 上一篇    下一篇

间接原子吸收光谱法测定鸡蛋中碘含量

陈丽娟1,冯 玲1,罗 荻1,柳 莎1,姚程炜2,黄宝美1,*   

  1. 1.绵阳师范学院化学与化学工程学院 2.中国空气与动力发展中心设计与设备研究所
  • 出版日期:2012-06-25 发布日期:2012-07-27

Determination of Iodine in Eggs by Indirect Atomic Absorption Spectrometry

CHEN Li-juan1,FENG Ling1,LUO Di1,LIU Sha1,YAO Cheng-wei2,HUANG Bao-mei1,*   

  1. (1. College of Chemistry and Chemical Engineering, Mianyang Normal University, Mianyang 621000, China; 2. Institute of Facility Design and Instrumentation, China Aerodynamic Research & Development Center, Mianyang 622653, China)
  • Online:2012-06-25 Published:2012-07-27

摘要: 建立鸡蛋中微量碘测定的一种新方法--间接原子吸收光谱法。在抗坏血酸作用下,Cu2+被还原为Cu+,I-与Cu+反应生成CuI沉淀,利用此原理,测定上清液中剩余铜的含量,从而间接求得鸡蛋中碘的含量。实验考察温度、离心时间、反应时间、氧化剂用量及酸性介质对结果的影响,选取反应在30℃进行,离心时间10min,质量浓度1000μg/mL的抗坏血酸溶液0.80mL,酸性介质为pH4.0的邻苯二甲酸氢钾缓冲溶液。该法操作简便,线性范围宽,检出限低于1.0μg/mL,相对标准偏差为0.58%。该方法简单、快速,利用它测定食品中碘的含量,结果令人满意。

关键词: 间接原子吸收光谱法, 鸡蛋,

Abstract: A new method to determine iodine in eggs by indirect atomic absorption spectrometry (AAS) was established. Based on the reduction of Cu2+ by ascorbic acid to Cu+ for precipitation between Cu+ and I-, Cu residue in the supernatant was determined and calculated to obtain iodine content in eggs. The reaction was carried out using 0.8 mL of 1000 μg/mL ascorbic acid solution in pH 4.0 potassium hydrogen phthalate buffer at 30 ℃, and the centrifugation time was 10 min. This method was simple and rapid and had a wide linear range. The detection limit was 1.0 μg/mL. Satisfying results were obtained in the determination of iodine in actual samples by this method.

Key words: indirect atomic absorption spectrometry, egg, iodine

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