In 1. gas chromatography, if the separation degree of benzene and toluene is not ideal, how to change the chromatographic conditions?

In the gas phase, better separation can be achieved mainly by replacing the appropriate chromatographic column and adjusting the programmed temperature rise. But generally speaking, the contribution of programmed temperature to the resolution of analytes is limited, so it is suggested to replace the corresponding chromatographic column to obtain better separation. You can try to adjust the heating program first to slow down the heating rate. If not, change the column.