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研究了铈组稀土元素与三溴偶氮胂（ＴＢＡ）的显色反应，在强盐酸介质中铈组稀土元素与ＴＢＡ形成蓝紫色络合物，其最大吸收在６３５ｎｍ，铈组稀土与ＴＢＡ的络合比为１３，表观摩尔吸光系数为（１．１５～１．２５）×１０５Ｌｍｏｌ－１ｃｍ－１，在（０～２５）μｇ／５０ｍＬ范围内遵守比耳定律。这个方法已应用于直接光度测定铝合金中的铈组稀土，并获得满意结果。
The color reaction of rare earth elements with tribromoarsenazo (TBA) in cerium group was studied. The rare earth elements in cerium group formed a blue-violet complex with TBA in strong hydrochloric acid medium, and the maximum absorption was at 635 nm. The complex molar ratio was 13, and the apparent molar absorptivity was 1.15 ~ 1.25 × 105Lmol-1cm-1. Beer’s law was observed in the range of (0-25) μg / 50mL. This method has been applied to direct spectrophotometric determination of cerium rare earths in aluminum alloys and obtained satisfactory results.