研究了 2 -[2′-( 5′-甲基苯并噻唑 )偶氮 ] -5 -二乙氨基苯甲酸 ( 5 -Me-BTAEB)的合成 ,且对其与镍 ( )的显色反应进行了全面的研究。结果表明 ,在十二烷基硫酸钠 ( SDS)存在下 ,5 -Me-BTAEB在弱酸性介质中与 Ni( )形成稳定的蓝紫色配合物 ,该配合物组成为 n Ni( ) ∶ n5 - Me- BTAEB=1∶ 2 ,最大吸收波长为 65 4 nm,表现摩尔吸光系数为 1.5 0× 10 5 L/mol·cm,Ni( )浓度在 0～ 10 μg/2 5 m L范围内服从比尔定律。该方法可直接用于测定铝合金标样中微量镍 ,结果满意。 The synthesis of 2 - [2 ’- (5’-methylbenzothiazole) azo] -5-diethylaminobenzoic acid (5-Me-BTAEB) was studied and its color reaction with nickel Conducted a comprehensive study. The results show that 5-Me-BTAEB forms a stable blue-purple complex with Ni () in weak acid medium in the presence of sodium dodecyl sulfate (SDS) Me- BTAEB = 1: 2, the maximum absorption wavelength was 654 nm, the molar absorptivity was 1.5 × 10 5 L / mol · cm and the Ni () concentration was in the range of 0 ~ 10 μg / law. The method can be directly applied to the determination of trace nickel in the standard aluminum alloy with satisfactory results.