In an experiment we are supposed to analyse a series of standards to get their retention times for identification purposes. But before that we needed to obtain the optimal linear flow rate by using ethylbenzene as the analyte. We were using nitrogen gas carrier gas. However I don't understand the rationale for this choice since compared to the other components it has the 2nd highest boiling point and one of the lowest polarities.
The other standard samples include o-xylene, toluene, ethanol, n-propanol, n-butanol, n-pentanol, cyclohexane and ethylbenzne itself, which have a spread of boiling points from 78C to 144C and the polarity range is also relatively large. However ethylbenzene does not have the intermediate properties of these analytes so I'm not very sure why it was chosen for this experiment. Does anyone have any insight for this?