摘要
建立了一种衰减全反射/傅里叶变换红外光谱(ATR/FTIR)测定有机羧酸的离解常数(Ka)的方法。根据Beer-Lambert定律和有机羧酸的电离平衡推导出羧酸(HL)-羧酸盐(L-)溶液pH值与lg(A-L/AHL)存在线性关系,通过线性曲线的斜率方便地求出有机羧酸的pKa,从而实现有机羧酸离解常数的准确测定。
In this paper,a method for determination of dissociation constant(Ka)of organic carboxylic acid by attenuated total reflection/Fourier transform infrared spectroscopy(ATR/FTIR)was developed.A linear relationship between pH of carboxylic acid(HL)-carboxylate(L-)solutions and lg(AL-/AHL)was found based on Beer-Lambert Law and HL's dissociation equilibrium.The pKa of organic carboxylic acid was conveniently obtained from the slope of the linear curve,and thus the dissociation constant could be accurately achieved.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2016年第S1期87-88,共2页
Spectroscopy and Spectral Analysis
关键词
离解常数
红外光谱法
衰减全反射
羧酸
Dissociation constant
FTIR
Attenuated total reflection
Carboxylic acid
