摘要
研究了10种二取代苯甲腈类有机污染物的水解行为,用反相高效液相色谱测定了不同pH值和不同溫度下的水解速度常数。结果表明,含羟基的化合物在酸,碱和中性水介质中均不易水解;其它化合物仅在碱性介质中水解,其碱性催化水解速度常数与Hammett取代基常数以及酸常数之间呈近似线性关系。相关方程为:lgk_B=1.45σ-0.859和lgk_B=-1.34pK_(?)-4.83。
A series of hydrolysis rate constants and activation energy of 6 disubstituted benzonitriles were determined at pH 10-14 and 40-80℃ by HPLC. The fate constants of these compounds at 25℃ were obtained by extrapolating. There is a linear relationship between lgkB(kB defined as hydroly-Sis rate constant for base-catalysis) and σ (Hammett Yett substituent constant) in the form of lgkB=1. 45σ - 0.859. Also, the relationship between lg kB and pKa(acid constant) was obtained in the form of .The resurts obtained are significant and useful to predicting the effects of all disubstituted behzoni--. triles on the environrnent and can offer some scientific data for the risk-assessment and treatment of . these, organic pollutants.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第9期988-992,共5页
Chemical Journal of Chinese Universities
关键词
苯甲腈
水解
HPLC
Benzonitrile,Hydrolysis-, HPLC, Hammett Substituent constant, Regression equation
