Headspace GC - problem with PCE reproducibility

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Hello

I would like to ask about the problem with reproducibility in headspace GC. I am analysing PCE in water samples. I first prepare sock solution by dissolving PCE in methanol and then inject it into water.

I have good reproducibility of MeOH peak, but a bad one in the case of PCE.


SHS conditions:

Oven: 80 °C
Manifold: 100°C
Transfer line: 110°C
Loop fill time (min): 0.1
Loop eq. time (min): 0.1
Equlib: 3min

GC conditions:
Injector: 120°C
45°C (hold 1min); 175°C (30°C/min) (3min)

Is there any changes I can make to reach good reproducibility?

Any advice would be greatly appreciated thanks.
Keep in mind that not everyone on this forum knows what you're talking about when you use acronyms. What is PCE?
I think they are referring to tetrachloroethylene, also know as perchloroethylene or PCE.
PEC means perchlrethylene, tetrachlorethene. Sorry
Your equilibration time of 3 minutes seems very low. Is this allowing enough time for your analytes to reach equilibrium?
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