Hi Frank,

At 08:18 09.08.99 +0001, Frank Pawellek wrote:
>Isogeochemists,
>
>I havefound  the reference of the paper on a mass spectrometric
>correction for the presence of N2O when measuring 18 O in CO2. It is
>
>Friedli & Siegenthaler (1988) Influence of N2O on isotope analyses in
>CO2 and mass-spectrometric determination of N2O in air samples.
>Tellus, 40 B, 129 - 133.

This is indeed the paper I could have mentioned once. But if I remember
well, the method described therein cannot be applied to samples containing
N2O, which isotopic composition is far away from the composition of
atmospheric N2O. But the same principle can probably be applied to other
kind of samples, after a new qualibration (if the isotopic composition of
the N2O does not vary too much between the different samples).

Cheers,

Silvio



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