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Re: HS-GC-FID Ethanol Method: bias
Posted: Fri Sep 19, 2025 7:19 pm
by DR
That's the surface the vials sit on.
Re: HS-GC-FID Ethanol Method: bias
Posted: Fri Sep 19, 2025 9:12 pm
by Peter Apps
"The Nexus holds 90 samples. Forgive me for the silly question for you, but what is a platten? "
Out of the 90 it can hold, how many are in the oven at one time, warming up and equilibrating?
Peter
Re: HS-GC-FID Ethanol Method: bias
Posted: Mon Sep 22, 2025 3:02 pm
by crimgal
"The Nexus holds 90 samples. Forgive me for the silly question for you, but what is a platten? "
Out of the 90 it can hold, how many are in the oven at one time, warming up and equilibrating?
Peter
From my observation, it's usually two. If you change the equilibration time, it bumps up to about 3 headspace vials at any time in the HS Oven. I've measured the surface of the headspace rack surface and there's no obvious "hot spots".
Re: HS-GC-FID Ethanol Method: bias
Posted: Mon Sep 22, 2025 10:22 pm
by Peter Apps
How long does it take to run 30 samples?
Re: HS-GC-FID Ethanol Method: bias
Posted: Tue Sep 23, 2025 4:58 pm
by crimgal
How long does it take to run 30 samples?
Looks like a run of 30 samples takes 125 minutes.
Re: HS-GC-FID Ethanol Method: bias
Posted: Mon Oct 06, 2025 9:49 pm
by Peter Apps
On all heaspacers sometimes the equilibrium time and the run time on the GC get into synchrony after a certain number of samples, and then the interval between two consecutive vials is longer than usual because something was not ready. Sometimes that makes a blip (higher or lower) in the results for one or two vials.
Can you get the job done with sequences of 30 vials? If so, I would write that into the method, and then the rise after 30 vials will no longer trouble you.
Peter