一、前言早在1888年Traumann就提出4-(2-噻唑偶氮)-间苯二酚(简称TAR)和1-(2-噻唑偶氮)-2-萘酚(简称TAN)等噻唑偶氮染料,但并未研究它与金属离子的生色性和在分析化学中的应用。直到1955年程广禄等提出1-(2-吡啶偶氮)-2-萘酚(简称PAN)作为分析试剂之后,才相继由金庭、柳原等、Jensen和Svoboda等应用噻唑偶氮衍生物作为螯合滴定法的金属指示剂和比色法的显色剂。新近更合成了许多类似于PAN的噻唑偶氮染料。由于此类化合物较 I. Introduction As early as 1888, Traumann proposed thiazole compounds such as 4- (2-thiazolylazo) -resorcinol (TAR) and 1- (2-thiazolylazo) Nitrogen dyes have not been studied for their color-forming properties with metal ions and their application in analytical chemistry. Until 1955, Cheng Guanglu et al proposed 1- (2-pyridylazo) -2-naphthol (referred to as PAN) as an analytical reagent only after Jin Ting, Liu Yuan, Jensen and Svoboda other thiazole azo derivatives as a chelation Combined titration metal indicator and colorimetric reagent. Recently, many more similar to PAN thiazole azo dye. Because of these compounds