三溴偶氮胂直接光度法测定铝合金中铈组稀土元素  

Direct Spectrophotometric Determination of Cerium Subgroup of Rare Earth Elements in Aluminium Alloys with Tribromoarsenazo

作　　者：吴雅琴[1] 潘傥[2] 李莉 

机构地区：[1]华兴航空机轮公司 [2]北京航空材料研究院

出　　处：《材料工程》1997年第11期31-33,共3页Journal of Materials Engineering

摘　　要：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。In this paper,the colour reaction of the cerium subgroup of rare earth elements with tribromoarsenazo(TBA)has been studied Cerium subgroup reacts with the reagent in strong acid medium of HCl to form a blue violet complex which has a maximum absorption at 635nm and its molar ratio of Ce subgroup to TBA is 1∶3 The apparent molar absorptivity is(1 15～1 25)×10 5L·mol -1 · cm -1 Beer′s law is obeyed in (0～25)μg/50mL The method has been applied to the direct photometric determination of the Ce subgroup in aluminium alloys with satisfactory results

关 键 词：三溴偶氮胂 铈组稀土元素 铝合金 直接光度法 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG115.335[金属学及工艺—金属材料]