食品科学 ›› 2002, Vol. 23 ›› Issue (9): 93-96.

• 分析检测 • 上一篇    下一篇

偶氮氯膦-Ⅲ分光光度法测定微量铅的研究

 李竹云   

  1. 烟台大学应用化学系
  • 出版日期:2002-09-15 发布日期:2011-12-31

Spectrophotometric Determination of Trace Lead with CPA-Ⅲ

 LI  Zhu-Yun   

  • Online:2002-09-15 Published:2011-12-31

摘要: 研究了偶氮氯膦-Ⅲ与铅的显色反应,在稀盐酸介质中,铅与偶氮氯膦-Ⅲ形成了1:2的紫色配合物,最大吸收波长为650nm,铅含量在0~15μg/25ml的范围内符合比耳定律,表观摩尔吸光系数为ε=5.7×104L•mol-1•cm-1。应用于市售茶叶中微量铅的测定,获得了较为满意的结果。

关键词: 分光光度法, 偶氮氯膦-Ⅲ,

Abstract: The color reaction between Pb2+and CPA-Ⅲ was studied. In the medium of 0.2mol/L HCl, lead could form a violet-red complex with CPA-Ⅲ. The maximum absorption of the complex occurred at 650nm .The apparent molar absorptivity was 5.7×104L•mol-1•cm-1, and Beer’s law was obeyed in the range of 0~15μg(Pb)/25ml. This method has been applied to determinate trace lead in cosmetics and water successfully.

Key words: Spectrophotometry , CPA-Ⅲ , Lead