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Stable Isotope Geochemistry

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Subject:
From:
Hilary Stuart-Williams <[log in to unmask]>
Reply To:
Stable Isotope Geochemistry <[log in to unmask]>
Date:
Tue, 24 Feb 2004 14:01:21 +1100
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Thanks Toti

Could I have a copy of the application notes?

Now there's a good question about the CO2!

Yes, it does come off, as rather a blurred peak at 1000 seconds under our
conditions.  So, if you do a 600 second run, your CO2 comes off RIGHT in the
tail of your CO.  And although the amplitude is very small after scrubbing,
the dissociation in the source causes some wild values.  But even without
the CO2 -> CO+O fractionation, the gas comes from the PREVIOUS sample.

So you have to scrub VERY well or do long runs.  And the CO2 doesn't have
enough amplitude (from our set up) to show on anything apart from the ratio
traces.  And then only for about 1 in 20 samples ...

Hil

.

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