合成了新显色剂2-〔2，3，5-三氮唑〕-5-〔(N，N-二羧基甲基)氨基〕苯甲酸(简称TZACAB)，并研究了性质及其与Pd显色反应的条件。结果表明：试剂的分子式C13H12N6O6，分子量349.27；在pH 3.18 HAc-NaAc缓冲溶液中，试剂与Pd形成1∶1蓝色络合物，λmax为661.4 nm，Pd量在0～1.2 μg*ml-1范围内遵守比耳定律，表观摩尔吸光系数为ε=1.72×104 L*mol-1*cm-1，大量的其它金属离子共存时，不经预分离也无需掩蔽剂可直接测定Pd-Pt催化剂中的微量Pd，操作简便，结果满意。
A new chromogenic reagent 2-〔2,3,5-Triazolyazo〕-5-〔(N,N-Dicarboxymethyl)amino〕benzoic acid was synthesized and its colour reaction with palladium was studied spectrophotometrically.The structure of the reagent was determined by elemental analysis,UV spectra,IR spectra.The reagent react with Pd(Ⅱ)to form a stable red complex(1∶1)in the presence of HAc-NaAc at pH 3.18.The apparent molar absorptivity is 1.72×104 L*mol-1*cm-1 at λmax=611.4 nm.Beer's law obeyed in the range of 0～1.2 μg*ml-1.The method has been applied to the direct determination of Pd-Pt catalysts with satisfactory results.
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