Читать книгу Process Gas Chromatographs - Tony Waters - Страница 56

The main text uses the concept of “solubility” because it's intuitive and easy to understand. The solubility of a component depends on how easily its molecules can interact with the molecules of the stationary phase.

In that text, we make the simplifying assumption that “75 % solubility” means 75 % of the molecules dissolve in the liquid phase and 25 % remain in the gas phase.

While convenient and applicable to a given column, this representation fails to account for the volume of each phase inside the column, an important variable. Instead of using the number of molecules, the formal expressions of solubility use the concentration of the solute in each phase, thus incorporating the volume of each phase.