Читать книгу Process Gas Chromatographs - Tony Waters - Страница 55

In Figure 2.9, the retention time of the propane peak is always the same, regardless of the plate number. The plate number of a column affects only the peak width; it has no effect on the peak retention time.

In Figure 2.9, the peak apex has traveled along the column exactly half the distance that the carrier gas has traveled. This remains true during all of its journey through the column. When the carrier gas reaches the end of the column, as depicted, the propane peak has reached the mid‐point. At that time, it's only halfway through the column.

That's a lot of information to absorb, and it's all important for understanding how columns separate components. Before we look into what causes separation, you might want to read it again.

The SCI‐FILE that follows is optional reading, but is not difficult to understand. It gives a more technical account of solubility, so you may find it interesting.