摘要
研究了三溴偶氮胂与钡的显色反应及共存离子的影响。结果表明，在0．3mol／L的H3PO4介质中，钡与显色剂形成稳定的紫色络合物，最大吸收波长为618nm，表观摩尔吸光系数为3．90×104L／（mol·cm）；在25mL的溶液中，钡量在0～40mg范围内符合比尔定律，显色反应具有较高灵敏度，方法可用于测定硅钙钡合金中钡含量，测定结果与认定值相符，其相对标准偏差（RSD）小于2％。
The chromogenic reaction between tribromoarsenazo and barium was studied as well as the influ- ences of coexistent ions on the reaction. The results show that barium reacts with the chromogenic reagent in 0.3 mol/L H3PO4 solution to form a stable purple complex,which exhibits an absorption maximum at 618 nm with an apparent molar absorptivity of 3.90 × 104 L/（mol cm）. Beer＇s law is obeyed with the barium content of 0-40 μg/25 mL. The chromogenic reaction is of high sensitivity and the speetrophotometry can be used to determine the barium content of Si-Ca-Ba alloy. The determined results are in agreement with the certified values, and the relative standard deviation （RSD） is less than 2%.
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2010年第1期44-46,共3页
Rare Metals and Cemented Carbides
关键词
三溴偶氮胂
分光光度法
硅钙钡合金
钡含量
tribromoarsenazo
spectrophotometry
Si-Ca-Ba alloy
barium content
