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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％。
The chromogenic reaction of the dibenzylcarboxyarsenazone (DBMCA) with cerium group was studied. In the 0.16-0.60 mol / L hydrochloric acid medium, the cerium group formed a blue complex with the reagent, the maximum absorption peak of the complex was 630 nm, the molar extinction coefficient ε 630 (La-Tb ) Is 1.16 × 10 ~ 5-1.30 × 10 ~ 5. The CE complies with Beer’s law at 0.5-12 μg / 25 ml. Due to the presence of ethanol and surfactant TritonX-100, the method has good selectivity. The determination of 40mgCa2 +, 10mgFe3 +, 3mgTi4 + did not interfere with the determination. The method can directly measure the cerium rare earth in the slag and the welding rod skin without separation. The recoveries ranged from 95% to 104% with RSD <4%.