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合成了新试剂 2 - ( 2 -噻唑偶氮 ) - 5 - [( N,N-二羧甲基 )氨基 ]苯磺酸 ( TADCABS) ,并研究了其与钯 ( )的显色反应。在 0 .4mol·L- 1 HCl O4介质中 ,TADCABS与钯 ( )反应生成稳定的 1∶ 1蓝色水溶性配合物 ,其最大吸收波长为 6 4 1 .8nm,钯量在 0～ 1 .6 μg·m L- 1 范围内符合比耳定律。用双波长测定 ,表观摩尔吸光系数 ε641 .8;52 2 =7.4× 1 0 4 L· mol- 1 · cm- 1 ,大量的其他金属离子共存时 ,不经预分离也无需掩蔽剂可直接测定铂钯催化剂中的微量钯。操作简便 ,结果令人满意。
A new reagent 2 - (2 - thiazolylazo) - 5 - [(N, N - dicarboxymethyl) amino] benzenesulfonic acid (TADCABS) was synthesized and its color reaction with palladium (Ⅱ) was studied. In 0. 4mol·L-1 HCl O4 medium, TADCABS reacts with palladium () to form a stable 1: 1 blue water-soluble complex with a maximum absorption wavelength of 6 4 1 .8 nm and a palladium content of 0-1. Beer’s law is valid for 6 μg · m L -1. With the dual wavelength determination, the apparent molar absorptivity ε641.8; 52 2 = 7.4 × 104 L · mol -1 · cm -1, a large number of other metal ions coexist without prior separation without masking agent can be directly The trace palladium in the platinum-palladium catalyst was measured. Easy to operate, the results are satisfactory.