新显色剂二溴对甲基偶氮溴磺光度法测定铈组稀土的研究及应用  

Spectrophotometric Determination of Rare Earths with a New Chromogenic Reagent Dibromo-p-methyl-bromosulfonazo

作　　者：方国臻[1] 潘教麦[2] 周伟良[2] 林开利[2] 

机构地区：[1]山西雁北师范学院化学系,大同037000 [2]华东师范大学化学系,上海200062

出　　处：《分析试验室》2000年第6期62-64,共3页Chinese Journal of Analysis Laboratory

基　　金：雁北师范学院青年科学研究基金!资助课题 ( 0 0 0 90 0 2)

摘　　要：研究了新显色剂二溴对甲基偶氮溴磺与铈组稀土的显色反应 ,在 0 .6mol·L-1的盐酸介质中 ,试剂与铈组稀土元素形成 2∶ 1稳定的蓝色络合物 ,其最大吸收波长位于 642 nm处 ,稀土含量在 0～ 1 .0 μg/m L 范围内符合比耳定律。建立了直接光度法测定钢铁样品中铈组稀土总量的方法。A new method for determination of cerium subgroup rare earths was studied and reported. It was found that rare earth ions could react with a new chromogenic reagent dibromo p methyl bromosulfonazo in hydrochloric acid medium to form a 1:2 stable blue complex with an absorption maximum at 642 nm. Beer`s law is obeyed for the rare earths in the range of 0～1 0μg/mL. The method was applied to determination of the total amount of cerium subgroup rare earths in steel samples with satisfactory results.

关 键 词：二溴对甲基偶氮溴磺 铈组稀土 光度法 测定 钢铁 

分 类 号：O614.332[理学—无机化学] TG115.335[理学—化学]