摘要
研究了对乙酰基偶氮氯膦（CPApA）与钡的显色反应。结果表明，在0．40mol／LH3PO4介质中，CPApA与钡（Ⅱ）反应生成2：1稳定络合物，其最大吸收波长为646nm，表观摩尔吸光系数为1．35×10^5L·mol^-1·cm^-1。钡质量浓度在0～0．80mg／L范围内符合比尔定律。方法已用于硅钡镁合金中钡的测定，结果与重量法相符，实际样品分析结果的相对标准偏差小于3％，加标回收率为97．4％～102．6％。
The color reaction of barium with p-acetylchlorophosphonazo （CPApA） was studied. In 0. 40 mol/L H3PO4 medium, p-acetylchlorophosphonazo reacts with barium （Ⅱ） to form a stable 2 ： 1 complex, whose maximum absorption wavelength is at 646 nm and apparent molar absorptivity is 1.35×10^5L·mol^-1·cm^-1. Beer＇s law was obeyed in the range of 0-0.80 mg/L for barium. The barium content in Si-Ba-Mg alloy has been determined by this method, and the results are in good agreement with those provided by gravimetry. The relative standard deviation is less than 3% and the recoveries of samples are between 97.4% and 102.6%.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2008年第1期74-76,共3页
Metallurgical Analysis
