Headspace GC - problem with PCE reproducibility
Posted: Thu Nov 08, 2018 9:03 pm
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.
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.