新显色剂二溴对甲基偶氮甲磺光度测定稀土的研究和应用  

STUDY ON THE SPECTROPHOTOMETRIC DETERMINATION OF RARE EARTHS WITH MSA-DBM AND ITS ANALYTICAL APPLICATION

作　　者：潘教麦[1] 刘勇[1] 岳靖 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《理化检验（化学分册）》1997年第2期61-62,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：研究了新显色剂二溴对甲基偶氮甲磺光度测定铈组稀土总量的方法。在酸性介质中,试剂与以铈组稀土为代表的稀土形成蓝色配合物,在644nm有最大吸收,铈含量在0～15μg/25ml范围内符合比耳定律。方法应用于钢铁中铈组稀土总量的直接测定,发现其准确性和重视性良好。A spectrophotometric method for the determination of cerium subgroup rare earths with a new chromogenic reagent dibromo-p-methyl-methylsulfonazo is studied. In acid medium, cerium reacts with the reagent to form a blue complex which has an absorption maximum at 644nm. Beer' s law is obeyed for 0~15μg of cerium in 25ml solution. The method has been applied to the direct determination of cerium subgroup rare earths in steels with satisfactory accuracy and precision.

关 键 词：光度测定 铈组 稀土总量 钢样 显色剂 

分 类 号：TG115.314[金属学及工艺—物理冶金] TG146.45[金属学及工艺—金属学]