四、用热力学参数来评价固定液前述用保留指数增量来评价固定液的方法,是建立在实验经验的基础上,这些常数的测定是依据一定条件的。首先必须确定选择的溶质,其次都以角鲨烷(或氢化阿匹松M,或带有支链的烷烃 C_(87)H_(176))作为“零”极性的标准,测出的常数虽然反映了溶质与固定液间的不同类型分子间作用力,并给出固定液极性的相对顺序,但这种方法只注重了实用的效果,而缺少一种根据理论原理来处理问题的一般性依据,其对固定液“极性”概念的描述是不确切的,更不能指望用它来讨论固定液极性的绝对标准。因此,从七十年代以后,不少色谱工作者深入研究了保留值的热力学依据,企图确立 Fourth, the use of thermodynamic parameters to evaluate the fixed liquid The retention index increment method used to evaluate the fixed liquid is based on experimental experience, the determination of these constants are based on certain conditions. First, the solute of choice must be identified, followed by the standard of zero polarity for squalane (or hydromixin M or paraffins C_ (87) H_ (176)) Although it reflects the interaction between different types of intermolecular solute and fixative and gives the relative order of the polarities of the fixatives, this approach focuses only on practical effects and lacks a general approach to solving problems based on theoretical principles Sexual basis, its description of the concept of “polar” fixative is not clear, and can not be expected to use it to discuss the absolute standard of fixed liquid polarity. Therefore, from the seventies, many chromatographers in-depth study of the thermodynamic basis for retention, in an attempt to establish