对甲基二溴偶氮胂直接光度法测定微量锆

Spectrophotometric Determination of Micro Amounts of Zirconium with p-Methyldibromoarsenazo

本文研究了锆与新试剂对甲基二溴偶氮胂（ＤＢＭＡ）的显色反应。在０，８ｍｏｌ／Ｌ盐酸介质中，锆与该试剂形成蓝色配合物，它的最大吸收波长为６３８ｎｍ，表观摩尔吸光系数为５．２×１０￣４Ｌ．ｍｏｌ￣（－１）·ｃｍ￣（－１），锆浓度在０～２０μｇ／２５ｍｌ时服从比尔定律。方法用于测定铝、镁、铜等合金中的锆，获得满意结果。

In this paper，the colonr reactiOn of zirconium with a new reagent p-methyldibromo－arsenazo has been developed．A blne coloured complex is formed in 0．8mol／L hydrOchloric acid medium .Itsmaximum absorption is at wave length 638nm and the apparent molar absorptivity is 5．2 × 10~4 L.mol^(-1)·cm^(-1)． Beer's law is obeyed in the range of o to 20μg per 25ml．The method has been applied to the deter-mination of zirconium in the al loys of aluminum, magnesinm and copper with satisfactory results.