Image

Please refer to image above, chromatogram of running through the temperature program.

When using a TCD detector I am seeing a large front, both when running through the temperature program and when injecting samples. Temperature program is 70 degrees for 1 min, ramp 10 degrees/min to 260 degrees, hold for 25 mins. Initially suspected it was column related but having the same issue with a brand new conditioned column (image is from new column). ZB-1, 60m x 0.32 x 5. For info, when connecting the column to an FID detector and running through the temperature program there is no fronting. Next step from my google research would be 'baking' the TCD if anyone has any experience with this and would like to share their experience. Any suggestions would be welcomed. First time posting in this forum.