二溴对甲基偶氮磺分光光度法测定硅铝钡合金中钡  

Spectrophotometric determination of barium in Si-Al-Ba alloy with dibromo-p-methylsulfonazo

作　　者：高琳[1] 姚军龙[2] 钟国秀[2] 

机构地区：[1]江汉大学化学与环境工程学院,湖北武汉430056 [2]湖北省机电研究设计院理化测试中心,湖北武汉430070

出　　处：《冶金分析》2006年第2期55-56,共2页Metallurgical Analysis

摘　　要：研究了二溴对甲基偶氮磺与钡的显色反应，建立了直接测定硅铝钡合金中钡含量的分光光度分析方法。在0．36mol／L磷酸介质中，钡与二溴对甲基偶氮磺形成1：5蓝色络合物，最大吸收波长为624nm，表观摩尔吸光系数为4．38×10^4L·mol^-1·cm^-1。25mL显色液中，钡质量在0～20μg内符合比尔定律，显色反应具有很好的选择性，主要共存离子均有较大允许量，可用于硅铝钡舍金中钡含量的直接测定。The chromogenic reaction of the new reagent dibromo-p-methylsulfonazo with barium（Ⅱ）was studied. In 0.36 mol/L H3PO4 medium, barium reacted with the reagent to form a blue complex with maximum absorption at 624 nm . The apparent molar absorptivity of the complex with a stoichiometric ratio of 1 ： 5, was 4.38 × 10^4 L·mol^- 1· cm^- 1. Beer＇ s law is obeyed in the range of 0 - 25μg/25 mL for barium. Most of common co-existing ions didn＇t cause interferences during the determination of barium. The results obtained by this method in the analysis of some Si-Al-Ba alloy samples were agreement with the certified values.

关 键 词：光度法 硅铝钡合金 二溴对甲基偶氮磺 钡 

分 类 号：TG115.3[金属学及工艺—物理冶金]