1-(4-甲基-6-羟基嘧啶)-3-(偶氮苯基)-三氮烯的合成及其与镉的显色反应

Synthesis of a new reagent 1-(4-methyl-6-hydroxyl-pyrimidine)-3-(phenyl-azo)-triazene and its color reaction with cadmium

合成了标题化合物，并研究了它与镉的显色反应。在pH11．0的Na2B4O7-NaOH缓冲溶液中，NP表面活性剂存在下，试剂与镉生成紫红色配合物，其最大吸收峰位于520nm，表观摩尔吸光系数ε为4．28×10^5L·mol^-1·cm^-1。Cd^2＋浓度在0～360μg/L范围内符合比尔定律。用拟定方法测定废水中微量镉。

1-（ 4-Methyl-6-hydroxyl-pyrimidine ）-3-（ phenyl-azo ）- triazene （MHPPAT） as a chromogenic reagent was synthesized and its color reaction with cadmium was also investigated. In the presence of the surface active agent NP and in the Na2B4O7- NaOH medium with a pH value of 11.0, MHPPAT could form a purple complex with Cd（Ⅱ）. The apparent molar absorbtivity of the complex was 4.28 × 10^5 L.mol^-1.cm^-1 at 520 nm（λmax）. The molar ratio of Cd（ Ⅱ ） to MHPPAT was 1：3 .The Beer＇s law was well obeyed in the range of 0 - 360μg/L of cadmium. The method has been applied to the direct determination of cadmium in wastewater With satisfactory results.