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4-(2’-吡啶偶氮)间苯二酚(PAR)及4-(2’-噻唑偶氮)间苯二酚均已用于铌的分光光度测定。为进一步阐明试剂结构对有色铌络合物形成的影响,并探寻对铌灵敏度更高的显色剂,作者等实验研究了下述吡啶偶氮及噻唑偶氮类型试剂与铌的反应:1-(2’-吡啶偶氮)-2-萘酚、8-羟基-7-(2’-吡啶偶氮)喹啉、4,5-二羟基-3-(2’-噻唑偶氮)-2,7-萘二磺酸、1-(2’-噻唑偶氮)-2-萘酚、4-甲基-2-(2’-噻唑偶氮)苯酚、1-(2’-噻唑偶氮)-2-萘酚-3,6-二磺酸、2-(2’-噻唑偶氮)-1-萘酚-4-磺酸、4-(2’-噻唑偶氮)-1-萘酚、3-二乙氨基-6-(2’-噻唑
Both 4- (2’-pyridylazo) resorcinol (PAR) and 4- (2’-thiazolylazo) resorcinol have been used for the spectrophotometric determination of niobium. In order to further elucidate the effect of reagent structure on the formation of colored niobium complex and to search for a developer that is more sensitive to niobium, the authors experimentally studied the following reactions of pyridine azo and thiazole azo type reagents with niobium: 1- (2’-pyridylazo) -2-naphthol, 8-hydroxy-7- (2’-pyridylazo) quinoline, 4,5-dihydroxy-3- Naphthalene disulfonic acid, 1- (2’-thiazolylazo) -2-naphthol, 4-methyl-2- ) -2-naphthol-3,6-disulfonic acid, 2- (2’-thiazolylazo) -1-naphthol-4-sulfonic acid, 4- (2’-thiazolylazo) -1-naphthalene Phenol, 3-diethylamino-6- (2’-thiazole