一种简单快速测定竞争性等温线的新方法——前流速度分析法

A Simple and Fast Method to Determine Competitive Isotherms- The Frontal Velocity Analysis Method

以间二酚和对苯二酚二元体系为例,以甲醇－水(体积比２０:８０)为流动相,采用前流速度分析法测定了该体系在Ｃ１８－硅胶固定相上的竞争性等温线．在相同实验条件下与传统的矩型脉冲法对该体系测定结果进行比较,结果表明,该法不仅能够准确测定二组分竞争性等温线,而且具有简单、快速等优点．

A simple and fast method, the frontal velocity analysis method was used to determine the com-petitive isotherms for p-dihydroxy-benzene and resorcinol on ODS-silica with volume ratio 20: 80methanol-water as the mobile phase. The data obtained from it are fitted to competitive-Langmulrisotherms, and the best parameters are obtained. Meanwhile, a classic method, the rectangular pulsemethod was also used to determine the competitive isotherms for the same system under the same condi-tions. The results obtained show that the competitive isotherms obtained from the frontal velocity analysismethod and the rectangular pulse method are in well agreement. This shows that the simpler and easiermethod - the frontal velocity analysis can be used to determine competitive isotherms with the same ac-curacy as the classic method.