多次静态气提／顶空气相色谱测定分配常数

本文研究了在多次气液平衡体系中,平衡次数或萃取气体积与挥发性组分在气相中的浓度间的线性关系。通过多次静态气提萃取,结合顶空GC方法,用动态气提和静态气提公式,分别测算了几种挥发性芳烃在气水两相间的分配常数,并讨论了两法的一致性与区别。同时定量考察了温度、电导率等对分配常数的影响,给出了两点式计算公式。

Determination of Distribution Coefficents by Multiple Static Gas Extraction/Headspace GC Analysis

This paper studied the linear relationship between the number of equilibrations or the extract gas volume and the concentration of volatile organic constituents in the gas phases equilibrated with water in multiple gasliquid equilibrium system. The Distribution Coefficents between gas and water phases of volatile aromatic hydrocarbon were determined by using multiple static gas extraction, combining with headspace GC techniques and calculated by static and dynamic gas extraction equation. The similazity and difference of static and dynamic methods were also discussed. The Effect of temperature and conductance on distribution coefficents was investigated. Two-point equation was suggested.