GC 8890 - baseline dropping and rising at the same retention time

Hello everyone,

I have a problem with this DB-Wax UI, 30m, 0.25, 0.25, for a long time. It has baseline dropping and rising at the same RT for all runs. It happens from 9-10 mins. I changed the inlet liner, o-ring and the gold seal, but it seems like it's not working.

Injection volume: 0.5 microliter

Method I used:

Inlet: 230C - front inlet

Oven:

40C hold for 5 mins

5C/min to 100C

50C/min to 240C

FID: 260C

Thank you,

Chau Dang

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