摘要
研究新显色剂二溴对甲基偶氮溴磺光度测定微量钡的方法。在 0 .72 mol·L- 1HCl介质中 ,试剂与钡形成 2∶ 1蓝色络合物 ,其最大吸收波长位于 62 8nm,表观摩尔吸光系数为 9.9× 1 0 4 L· mol- 1· cm- 1,钡量在 0～ 2 5 μg/2 5 m L范围内符合比耳定律。方法用于钛酸钡烧结物中微量钡的测定 。
A method for the determination of barium with a new chromogenic reagent dibromo p methyl bromosulonazo has been developed. In 0.72 mol·L -1 HCl medium, barium reacts with the reagent to form a 1∶2 blue complex which has an absorption maximum at 628 nm with a molar absorptivity 9.9×10 4 L·mol -1 ·cm -1 . Beer's law is obeyed in the range 0~25 μg of barium in 25 mL of solution. The method has been applied to the determination of micro amouts of barium in sintered materials of barium titanate with satisfactory results.
出处
《分析科学学报》
CAS
CSCD
北大核心
2001年第4期307-309,共3页
Journal of Analytical Science
关键词
二溴对甲基偶氮溴磺
钡
钛酸钡
测定
光度法
显色剂
Dibromo p methyl bromosulfonazo
Barium
Barium titanate
Spectrophotometric determination
