5-(对胂酸苯偶氮)-8-羟基喹啉与镍(Ⅱ)显色反应的研究及应用

Study On the Color Reaction of Nickel (Ⅱ) with PAPHQ and its Application

本文研究了新试剂５－（对胂酸苯偶氮）－８－羟基喹啉（ＰＡＰＨＱ）的性质及其与镍（Ⅱ）的显色反应。在ＣＴＭＡＢ存在下，ｐＨ４．０～５．０乙酸－乙酸钠缓冲介质中，镍（Ⅱ）与ＰＡＰＨＱ形成１∶２的红色配合物。最大的吸收波长为５１７ｎｍ，表观摩尔吸光系数为１．０２×１０５Ｌ．ｍｏｌ－１．ｃｍ－１，镍量在０～１２μｇ／２５ｍｌ范围内符合比耳定律。本法具有简便、快速、灵敏度高、选择性较好等优点。

In this paper The color reaction of nickel(Ⅱ) with 5 (4 Arson phentlazo) 8 hydroxylguinoline (PAPHQ) is studied.In the presence of CTMAB and pH 4.0～5.0 NaAc HAC buffer solution,Ni(Ⅱ) reacts with PAPHQ to form a 1∶2 red complex .The complex exhibits a maximum absorption at 517 nm with an apparent molar absorptivity 1.02×10 5 L.mol -1 .cm -1 .Beer's Law is obeyed in the range of 0～12 μg Ni(Ⅱ)/25 ml.The method is sensitive and secective,the proposed method is applied to determine of microamounts of nickel in tea and bean.