I am using a poraplot u column to measure C1-C2 hydrocarbons in oil through headspace. i first tried at 30 C and got the peaks separated. But i tried a tempearture program to decrease the run time. but the base line showed a rapid increase as soon as i started the temperature program as shown in the photos.
https://ibb.co/ikFf2J
https://ibb.co/jKOpwd

can someone please let me know whether this amount of increase is normal for a gc column. i cannot even do a high temperature bakeout as the maximum temperature for the column is 190.

if the base line is a problem any suggestions on how to improve

Thanks a lot