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.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2006年第2期55-56,共2页
Metallurgical Analysis
关键词
光度法
硅铝钡合金
二溴对甲基偶氮磺
钡
spectrophotometry
Si-Al-Ba alloy
dibromo- p-met hylsulfonazo
barium
