食品科学 ›› 2009, Vol. 30 ›› Issue (24): 307-310.doi: 10.7506/spkx1002-6630-200924067

• 分析检测 • 上一篇    下一篇

食品中微量铅的电位溶出法与示波极谱法测定的比较

金华丽,徐卫河,孙玉芳   

  1. 河南工业大学
  • 收稿日期:2009-01-08 修回日期:2009-07-28 出版日期:2009-12-15 发布日期:2010-12-29
  • 通讯作者: 金华丽 E-mail:jinhuali@haut.edu.cn
  • 基金资助:

    河南省教育厅自然科学基础研究项目(200510463021)

Comparison of Potentiometric Stripping Analysis and Oscillopolarography in Determination of Trace Lead in Foodstuff

JIN Hua-li,XU Wei-he,SUN Yu-fang   

  1. (Henan University of Technology, Zhengzhou 450052, China)
  • Received:2009-01-08 Revised:2009-07-28 Online:2009-12-15 Published:2010-12-29
  • Contact: JIN Hua-li, E-mail:jinhuali@haut.edu.cn

摘要:

目的:对测定食品中微量铅元素的电位溶出法和示波极谱法进行比较。方法:通过实验选择两种电化学方法的仪器工作条件和底液条件,在选定条件下测定样品,考察方法检出限、回收率等,并与标准方法进行比较。结果:电位溶出法线性回归方程为y=6361.50x - 1.227(R2=0.9999),方法检出限为1.95 × 10-4μg/ml,样品平均回收率为95.65%;示波极谱法线性回归方程为y=28.836x(R2=0.9999),方法检出限1.11 × 10-3μg/ml,样品平均回收率为103.36%。结论:电位溶出法具有较高的灵敏度,示波极谱法简便快速。

关键词: 电位溶出法, 示波极谱法, 食品,

Abstract:

This study was aiming at comparing the two methodologies in detecting lead in foodstuff. The instrument conditions and base solution of two methods of electric chemistry were selected through experiments. The linear regression equations of the determination of lead by potentiometric stripping method and oscillopolarography were y=6361.50x-1.227(R2=0.9999) and y = 28.836x (R2 = 0.9999), repectively. The detection limits and average recoveries were 1.95 × 10-4μg/ml and 95.65% for potentiometric stripping method and 1.11× 10-3μg/ml and 103.36% for oscillopolarography. In summary, potentiometric Stripping method seemed to more sensitive while oscillopolarography presented the benefits of simplicity and time-saving.

Key words: potential stripping, oscillopolarography, foodstuff, lead

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