三溴偶氮胂直接光度法测定钼合金中铈  

Determination of the Cerium Content in Molybdenum Alloy by Direct Spectrophotometry with Tribromoarsenazo

作　　者：杨浩义[1] 卢钒[1] 钟国秀[1] 

机构地区：[1]湖北省机电研究设计院,湖北武汉430070

出　　处：《稀有金属与硬质合金》2011年第3期72-74,共3页Rare Metals and Cemented Carbides

摘　　要：研究了显色剂三溴偶氮胂与铈的显色反应。结果表明:0.72mol/L H2SO4+0.9mol/L H3PO4溶液中,铈与三溴偶氮胂反应形成蓝色络合物,最大吸收波长为630nm,表观摩尔吸光系数为1.1×105 L/(mol.cm);25mL溶液中,铈量在0～30μg范围内符合比尔定律;方法可用于钼合金中铈的直接测定,相对标准偏差1.07%～2.20%,加标回收率为97%～101%。The chromogenic reaction between tribromoarsenazo and cerium was studied. The results show that cerium reacts with tribromoarsenazo to form a blue complex in the mixture solution of 0. 72 mol/L H2SO4 and 0.9 mol/L H3PO4. And the complex has an absorption maximum at 630 nm with an apparent molar absorptivity of 1.110^5 L/（mol · cm）. Beer＇s law is obeyed when the cerium content in 25 mL solu tion is in the range of 0-30 μg. The proposed method can be applied in direct determination of cerium con tent in molybdenum alloy with RSD of 1.07%-2.20% and standard addition recovery of 97%-101%.

关 键 词：三溴偶氮胂 铈 钼合金 分光光度法 

分 类 号：O657.32[理学—分析化学]