Hydrogen Isotopes GC-irMS

Hi Srinu!

We have a strange "tailing" in our GC-irMS when analyzing Hydrogen Isotopes of methane.

Its not really a tailin, more like a plateau at the end of the peak. The plateau is flat for certain time and it drops down to the actual baseline. Looks like this

' '

' '-------

--------' '----------

We dont know, what this is. We already changed the colomn (no effekt), heated the injection loop (no effect) and changed the Pt-wire tube in the reduction oven (no effect).

Do you an idea?

Regards from Hannover

Stefan Schloemer

Hi Karsten!

Of course it is a mixture. Samples are natural gas. I dont think there is a chromatographic separation of e.g. CH4 and CH3D etc possible. Why use an isotope mass spec if that would be possible :-))

Thanks for your input anyway!

Best regards from Hannover

Stefan

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