摘要
在热动力学理论的基础上,导出了简单级数反应的线性拟合法.应用这种方法研究了乙酸乙酯在纯水中、丙酸乙酯在“70%”乙醇-水混合溶剂中、丁酸乙酯在“85%”乙醇-水混合溶剂中皂化反应的热动力学.实验测得的速率常数与文献值相符合.
The formation condition and stability of 2 (5 bromo 2 pyridylazo) 5 diethylaminophenol(5 Br PADAP) with Mn(Ⅱ) in the presence of polyethylene glycol monooctylphenyl ether (Op) are investigated by spectrophotometry.Results show that a stable red complex is found in the medium of pH9.4.Beer′s Law is obeyed for Mn(Ⅱ) in the range of (0~1)mg/L.The molar absorptivity at 566nm is 1.06×10 5.The molar ratio of Mn(Ⅱ) to reagent in the complex is 1∶2.The relative standard deviation is less than 3.0% (6 determinations).The recovery of standard addition is 96%~98%.The method has been applied to the determination of Mn(Ⅱ) in tea with satisfactory results.
出处
《四川大学学报(自然科学版)》
CAS
CSCD
北大核心
1997年第4期474-480,共7页
Journal of Sichuan University(Natural Science Edition)
基金
国家自然科学基金
关键词
线性拟合法
简单级数反应
化学反应
热动力学
Manganese,polyethylene glycol monooctylphenyl ether,2 (5 bromo 2 pyridylazo) 5 diethylaminophenol,spectrophotometry,tea