二溴甲基偶氮羧胂直接光度法测定炉渣和焊条皮中铈组稀土  

Direct Spectrophotometric Determination of Cerium Group REE in Slags and Electrode Coatings with DBMCA

作　　者：黄永飞[1] 潘教麦[2] 杨秀清 刘勇[2] 

机构地区：[1]宝山钢铁(集团)公司研究院,上海201900 [2]华东师范大学化学系,上海200062

出　　处：《冶金分析》1999年第6期21-23,共3页Metallurgical Analysis

摘　　要：研究了新显色剂二溴甲基偶氮羧胂（ＤＢＭＣＡ）与铈组稀土的显色反应。在０．１６—０．６０ｍｏｌ／Ｌ的盐酸介质中，铈组稀土与试剂形成蓝色的络合物，络合物的最大吸收峰在６３０ｎｍ处，摩尔吸光系数ε_(６３０)（Ｌａ－Ｔｂ）为１.１６×１０~５-１.３０×１０~５。铈在０．５—１２μｇ／２５ｍｌ符合比尔定律。由于乙醇和表面活性剂ＴｒｉｔｏｎＸ－１００的存在，方法具有良好的选择性，４０ｍｇＣａ^(２＋),１０ｍｇＦｅ^(３＋)，３ｍｇＴｉ^(４＋)不干扰测定。本方法可以不经分离直接测炉渣和焊条皮中的铈组稀土．回收率在９５％～１０４％之间，ＲＳ Ｄ＜４％。A direct spectrophotometric method for the determination of cerium-group rare earth elements (REE) in slags and electrode coatings with DBMCA (dibromomethylcarboxyarsenazo) has been studied. In 0.16-0.60mol/L HCl medium, REE with DBMCA form blue complexes, which gives an absorption peak at 630nm with the molor absorpties of (La-Tb) 1.16-1.30 ×10~5L·mol^-1·cm^-1. Beer's law is obeyed in the rang of 0.5-12μg/25mL for cerium. In the presence of ethanol and Triton X-100, the method gives good selectivity. Cerium-group REE in slabs and electrod coatings without separation can be determinated. The accuracy and precision are both satisfactory.

关 键 词：直接光度法 测定 铈组稀土 炉渣 焊条皮 

分 类 号：O614.332[理学—无机化学]