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- Posts: 4
- Joined: Thu Feb 21, 2019 1:48 pm
we have a Shimadzu GC equipped with a BID (barrier discharge ionization detector). We make manual injections with the following parameters:
Column: ShinCarbon 2m
Split injection with a split ratio of 4
Injector: 150 C
Flow control with a flow of 7mL/min (pressure 276.4kPa, linear velocity 30.3cm/s)
Oven temperature is constant 100C and detector is at 280C. The whole program takes 6 minutes and the injection medium is H2 in Ar.
The injection is made every 10 minutes and after let's say 5 injections the baseline starts to fluctuate. If I heat the oven to 200C then will come a big peak and things will go back to normal for some time.
I assume that not all of the gases are eluted through the column as long as there is no higher temperature. Would it help if I increase the column flow?
How can I solve this issue?
Thanks a lot in advance!