| 铌-(5-Br-PADAP)-羟基酸体系混合型络合物的研究 |
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| 引用本文： | 史慧明,何锡文,张贵珠. 铌-(5-Br-PADAP)-羟基酸体系混合型络合物的研究[J]. 高等学校化学学报, 1980, 1(1): 44 |
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| 作者姓名： | 史慧明 何锡文 张贵珠 |
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| 作者单位： | 南开大学化学系 |
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| 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。
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| 收稿时间： | 1979-11-06 |
STUDY ON THE MIXED-LIGAND COMPLEXES IN THE SYSTEM OF NIOBIUM-(5-Br-PADAP)-HYDROXY ACID |
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| Shi Huiming,He Xiwen,Chang Guizhu. STUDY ON THE MIXED-LIGAND COMPLEXES IN THE SYSTEM OF NIOBIUM-(5-Br-PADAP)-HYDROXY ACID[J]. Chemical Research In Chinese Universities, 1980, 1(1): 44 |
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| Authors: | Shi Huiming He Xiwen Chang Guizhu |
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| Affiliation: | Department of Chemistry, Nankai University |
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| 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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