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用2-(2-吡啶偶氮)-5-二乙氨基酚(简称PADAP)及其卤代衍生物作显色剂测定过渡金属离子已有不少报导,其特点是灵敏度,选择性及萃取性能等都优于PAR。我们用5-C1-PADAP测铅,用5-Br-PADAP测锌、锑等均获得良好结果。虽有人提及Ni~(2+)-5-BrPADAP的光吸性特性,但尚未见系统的光度分析镍的研究。本文报告Ni~(2+)与5-Cl-PADAP、5-Br-PADAP、3,5-Br-PADAP生成紫色络合物的吸收光谱,克
There have been many reports on the determination of transition metal ions using 2- (2-pyridylazo) -5-diethylaminophenol (referred to as PADAP) and its halogenated derivatives as chromogenic reagents, which are characterized by sensitivity, selectivity and extraction Performance is better than PAR. We measured lead using 5-C1-PADAP, zinc, antimony, etc. using 5-Br-PADAP. Although some people have mentioned the light absorption properties of Ni ~ (2 +) - 5-BrPADAP, no systematic study on the photometric analysis of nickel has been found yet. In this paper, the absorption spectra of purple complexes with Ni 2+ and 5-Cl-PADAP, 5-Br-PADAP and 3,5-Br-PADAP were reported.