摘要
作者研究了ＤＢＣ－偶氮与稀土元素的显色反应．１．７ｍｏｌ／Ｌ盐酸介质中，该试剂与铈组稀土元素形成稳定的蓝紫色配合物．以双峰双波长（测定波长６３０ｎｍ，参比波长５２０ｎｍ）测定时，灵敏度高，表观摩尔吸光系数为１．４９×１０５．稀土含量在０～２０．０μｇ／２５．００ｍＬ范围内呈良好的线性关系，标准偏差小于０．００２％．
The color reaction of cerium group Rare earth with DBC-Arsenazo has been studied,it is shown that the blue-violet complex is formed in the 1. 7 mol/L HCL medium. The determination wavelength is 630 nm,the reference wavelength is 520urn. The appearent molar absorptivity is 1.49×105.Beer'law is obey6d in the range of 0-20. 0μg/25mL for Rare earth. The relative standard deviation is<0. 002%.
