高等学校化学学报

高等学校化学学报 ›› 1984, Vol. 5 ›› Issue (6): 791.

• 论文 • 上一篇    下一篇

分光光度测定铬的灵敏的新方法——铬(Ⅵ)-二溴苯基萤光酮-CPB显色体系的研究

张帆, 陈国南, 杨乙强, 黄少鹏   

  1. 福州大学化学化工系
  • 收稿日期:1983-07-25 出版日期:1984-12-24 发布日期:1984-12-24

A New Sensitive Method for Determination of Chromium (Ⅵ) by Spectrophotometry ——A Study on the Color, System of Cr(Ⅵ)-Br-PF-CPB

Zhang Fan, Chen Guonan, Yang Yiqiang, Hung Shaopeng   

  1. Department of Chemistry, Fuzhou University, Fuzhou
  • Received:1983-07-25 Online:1984-12-24 Published:1984-12-24

PDF (PC)

摘要： 详细研究了Cr(Ⅵ)-二溴苯基萤光酮-CPB的显色反应,发现Cr(Ⅵ)与二溴苯基萤光酮在CPB存在下,pH3.5—5.0时经50℃水浴加热10分钟能生成紫红色组成为1:3的络合物,其最大吸收波长位于586nm处,摩尔吸光系数为1.44×105.Cr(Ⅵ)在0—2.5μg/10ml范围内遵循比尔定律.CyDTA的存在可以消除大量常见离子的干扰.拟定了钢样及水中络的测定方法,并经实际样品的测定,取得较为满意的结果.

Abstract: The color reaction of Cr (Ⅱ) -Br-PF-CPBis studied in detail. In the presence of CPB, Cr (Ⅱ) is found to be able to react with Br-PFand form a purple complex in the pHrange of 3.5-5.0 under heating in 50℃ water for 10 min. The molar ratio of the complex is 1:3, its wavelength of maximum absorbance is 586nm.The molar absorptivity is 1.44× 105. Beer's Law is obeyed for 0-2.5μg of Cr(Ⅱ) in 10ml solution. In the presence of CyDTA, the interferences of many ordinary ions are eliminated. Amethod for determining Cr in steel and water is developed. It has been applied to real sample analysis, and good results are obtained.

TrendMD: