新显色剂5-(3-羟基苯偶氮)-8-羟基喹啉与镍显色反应的研究与应用

Study and Application of The Chromogenic reaction of New Chromogenic Reagent 5 (3 Hydroxylphenylazo) 8 Hgdroxyl Quinoline with Ni( II)

本文研究了新显色剂５－（３－羟基苯偶氮）－８－羟基喹啉（５－ＨＡＨＱ）在十六烷基三甲基溴化铵（ＣＴＭＡＢ）存在下，ｐＨ４．４～５．６范围内与镍（ＩＩ）的显色反应，并拟定了光度法测镍的方法。镍与显色剂形成１∶４的稳定的红色配合物，ε４９５＝８．３６×１０４Ｌ·ｍｏｌ－４·ｃｍ－１，镍在０～０．７２μｇ／ｍｌ范围内遵循比耳定律。用于测定钢铁中微量镍，结果满意。

This paper studies the chromogenic reaction of new chromogenic reagent 5 (3-Hgdroxye Pheylazo) 8 hydroxyl Quinoline(5HAHQ) with Ni( II) in the presence of cetyltrimethylammoniumbromide (CTMAB) and the pH value range from 4.4￣5.6. A steady red complex compound with the ratio 1:5 is formed by the reaction. ( 495 =8.36×104 L·mol -1 ·cm -1 .Beer's law is obeyed when the content of Ni (II) is in the range 0￣0.72 μg/ml. The method is applied to determine micro nickel in steel and cast iron with sastisfactory result.