本文报道了新显色剂5-(2′-噻唑偶氮)-2,4-二氨基甲苯的合成方法及其分析应用。试验结果表明,在强酸性溶液中,试剂仅与钯形成组成比为的1:1的蓝色可溶性稳定配合物,其最大吸收波长为590nm,表观摩尔吸光系数为5.7×10~4。钯浓度在0～35μg/25ml范围内遵守比尔定律。试剂对钯具有高选择性。所拟方法简单,快速,不经分离即可宣接进行含钯试样的分析。 This paper reports the synthesis method of new color reagent 5- (2’-thiazolylazo) -2,4-diaminotoluene and its analytical application. The experimental results show that the reagent can form the blue soluble stable complex with the ratio of 1: 1 only with palladium in strong acid solution, the maximum absorption wavelength is 590nm and the apparent molar absorptivity is 5.7 × 10 ~ 4. Beer’s law is obeyed in the range of 0 ~ 35μg / 25ml. Reagents are highly selective to palladium. The proposed method is simple, rapid, without separation can be declared for the analysis of palladium-containing samples.