高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (10): 1077-1079.

• 论文 • 上一篇    下一篇

新显色剂2-(2-噻唑偶氮)-5-二乙氨基苯甲酸分光光度法测定微量钴

沈含熙, 李建军   

  1. 南开大学化学系
  • 收稿日期:1987-03-11 出版日期:1988-10-24 发布日期:1988-10-24
  • 通讯作者: 沈含熙

Spectrophotometric Determination of Trace Cobalt with the New Reagent 2-(2-Thiazolylazo)-5-diethylaminobenzoic Acid

Shen Hanxi, Li lianjun   

  1. Department of Chemistry, Nankai University, Tianjin
  • Received:1987-03-11 Online:1988-10-24 Published:1988-10-24

摘要: 近年来,杂环偶氮苯甲酸类显色剂取得了较快的发展。由于氨基取代结构对试剂性能有较大的影响[1],因此本文合成了新显色剂2-(2-噻唑偶氮)-5-二乙氨基苯甲酸,(TAEB)并研究了它与钴的显色反应。

关键词: 钴的测定, 分光光度法, 2-(2-噻唑偶氮)-5-二乙氨基苯甲酸

Abstract: 2-(2-Thiazolylazo)-5-diethylaminobenzoic acid (TAEB) was synthesized and studied as a new reagent for the spectrophotometric determination of trace amount of cobalt. Its acid dissociation constants both in the absence and in the presence of Triton X-100 were determined. In a pH2.6~4.8 medium TAEBreacts with cobalt (Ⅲ) ions to form a stable complex, exhibiting an absorption maximum at 672nm. The molar absorptivity was found to be 1.26×105dm3·mol-1·cm-1. The constituent of the complex was established as Co:TAEB =1:3. Interference from copper, nickel, iron and chromium ions and etc. can be eliminated by acidification with HCl after cobalt complex is formed. The method has been used for the determination of trace cobalt in steel and iron directly with satisfactory results.

Key words: Cobalt determination, Spectrophotometry, 2-(2-Thiazolylazo)-5-diethyl-aminobenzoic acid reagent