1-（4-硝基苯基）-3-4-羟基-6-甲基-嘧啶）-三氮烯的合成及其与镍的显色反应

本文报道了1-（4-硝基苯基）-3-（4-羟基-6-甲基-嘧啶）-三氮烯（NPHMPDT）的合成及其与镉的显色反应研究。在OP的存在下，pH11．0的Na284O2-NaOH缓冲溶液中，该试剂能与镍发生显色反应，镍与NPHMPDT形成摩尔比为1：3型的配合物。在470nm处有一最大正吸收，在540nm处有一最大负吸收。以470nm为参比波长，540nm为测量波长进行双波长测定，表观摩尔吸光系数为1．48×10^5 L／（mol·cm）镍的浓度在0～400ug／L范围内符合比尔定律。用拟定方法测定铝舍金中微量镍，结果满意。

Synthesis of the New Reagent 1-(4-p-Nitrophenyl)-3-(4-Hydroxyl-6-Methyl-Pyrimidine)-Triazene and Its Color Reaction With Nickel

This paper reports the synthesis of the new regent 1-（4-p-nitrophenyl）-3-（4-hydroxyl-6-methyl-pyrimidine）-Triazene （NPHMPDT） and the color reaction of NPHMPDT with nickel. In the presence of the surface active agent OP and in the Na2B4OT-NaOH medium of pH ll.0,the reagent form a complex with nickel in the molar ratio of 1：3. The molar absorptivity is 1.48 ×10^5L/（mol·cm ）by dual-wavelength of 470nm and determination wavelength of 540nm. Beer＇s law is obeyed in the range of 0-500p, g/L. The method has been applied to the direct determination of nickel in aluminium alloys with satisfactory results.