唐松草新碱水溶液的氧化降解动力学研究

STUDLES ON DECOMPOSITION KINETICS OF THALIDASINE IN AQUEOUS SOLUTION

本文研究了唐松草新碱在水溶液中的氧化降解动力学。考查了pH值、离子强度、温度和氧含量的影响,水溶液中的氧化降解速率常数由荧光法测定。结果表明,唐松草新碱在过量氧存在下,其氧化降解反应服从假一级反应动力学方程式,速率常数可由下式表示:■其速率常数主要受介质的pH值和氧含量的影响,在pH 7.2条件下没有观测到原盐效应。

In this report, the decomposition kinetics of thalidasine (TD) in aqueous solution at pH 2.0～7.8, salt concentration 0～0.132mol/L, temperature 50, 60, 70,80℃, and different oxygen concentrations were investigated. The decomposition rate constant of TD in aqueous solution were determined by fluorescence spectrophotometer.The results showed: the oxidation reaction contributed largely to the overall decomposition, the oxidation rate of TD was found to be chiefly dependent on the pH of the medium and presence of oxygen. When in excess oxygen, the reaction followed pseudo firstorder kinetics with respect to TD concentration. The rate constant can. be expressed as:■ No primary salt effect was observed at pH 7.2.