锆(Ⅳ)-柠檬酸-溴邻苯三酚红-溴化十六烷基三甲基铵体系的显色反应及其应用

Study on the Colour Reaction of Zirconium(Ⅳ)-Citric Acid- Bromopyrogallol Red-Cetyltrimetylammonium Bromide and Its Application

在０．３６ｍｏｌ／ＬＨＣｌ介质中，有溴化十六烷基三甲基铵存在下，Ｚｒ（Ⅳ）与柠檬酸及溴邻苯三酚形成成胶束混配有色配合物，该配合物最大吸收波长在４７０ｎｍ，摩尔吸光系数为６．６４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１．锆量在０～０．８０ｍｇ／Ｌ范围内符合比尔定律。方法用于铝合金中微量锆的测定，结果满意。

In the medium of 0.36mol/L HCl,Zirconium(Ⅳ)reacts with bromopgallol red and Citric acid to form a colour complex of miceller mixed ligand in the presence of cetyltrimethylammonium bromide.The multicomponent complex exhibits maximum absorption at 470 nm with a molar absorptivity of 6.64×10 4L·mol -1 ·cm -1 .Beer′s law is obeyed in the range of 0～0.80mg/L for Zirconium..The proposed method has been applied to the determination of trace Zirconium in aluminium alloy with satisfactory results.