By Teng on Thursday, July 8, 2004 - 08:42 am:

I need help on trouble shooting peak area reproducibilty. My GC/MS is a Shimadzu GC-17A
model GCMS-QP5000. I'm having problem with peak reproducibilty. Any help?

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By Mark on Thursday, July 8, 2004 - 11:53 am:

Teng,
More details might be helpful, i.e. are you using an autoinjector, what kind of injection (split, splitless, ???) detector (FID, MSD, other).

Regards,
Mark

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By teng on Friday, July 9, 2004 - 09:11 am:

Mark,
I'm using an autoinjector. The injection is split, and I using a MSD detector. Any help?

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By Mark on Monday, July 12, 2004 - 10:57 am:

Teng,
I should have asked what the RSD values are, typically the RSDs when using a MSD seem to be higher than when using an FID for example. Other concerns might be using too volatile a solvent with too high of an initial column temp., not waiting for the injector to stabilize if you are using a gas saver feature on the GC before injecting the sample. Just some quick thoughts,

Regards,
Mark