高等学校化学学报

高等学校化学学报 ›› 1980, Vol. 1 ›› Issue (1): 44.

• 论文 • 上一篇    下一篇

铌-(5-Br-PADAP)-羟基酸体系混合型络合物的研究

史慧明, 何锡文, 张贵珠   

  1. 南开大学化学系
  • 收稿日期:1979-11-06 出版日期:1980-06-24 发布日期:1980-06-24

STUDY ON THE MIXED-LIGAND COMPLEXES IN THE SYSTEM OF NIOBIUM-(5-Br-PADAP)-HYDROXY ACID

Shi Huiming, He Xiwen, Chang Guizhu   

  1. Department of Chemistry, Nankai University
  • Received:1979-11-06 Online:1980-06-24 Published:1980-06-24

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被引次数

18

摘要： 在酒石酸、柠檬酸、草酸和其它羟基酸存在时,研究了铌和2-[(5-溴-2-吡啶)偶氮]-5-(二乙氨基)苯酚(简称5-Br-PADAP)的反应。发现在酒石酸(Tar)存在时,使用5-Br-PADAP测定铌得到最好的结果。本文用吸光光度法研究蓝色的铌-(5-Br-PADAP)-Tar的混合型络合物。在PH为1.0-4.0范围600毫微米处,此蓝色络合物有最大的吸收。摩尔吸光系数是5.7×104。用两种不同的方法研究混合型络合物的组成,Nb:5-Br-PADAP:Tar=1:1:1。在pH为1.0时,Nb的浓度1-32微克/25毫升范围内遵从比尔定律。本文提出高灵敏度和高选择性的吸光光度法测定合金钢中的微量铌。

Abstract: A ternary complex of Nb with 5-Br-PADAP and tartrate ion has been investigated as a sensitive and selective system for the spectrophoto-metric determination of Nb.The molar ratio of the three components in the complex is estimated to be Nb: 5-Br-PADAP: Tar=1:1:1 and the possible structure of the mixed ligand complex is proposed.Anew method has been developed for the rapid determination of Nb in steels without separated Nb from its accompanying elements

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