Jeremy,

I guess your question refers to compound specific 18O analysis? And the
question concerning IRMS doesn't really mean IRMS, but CF techniques, right?
Compound specific and continuous flow means GC-IRMS (separation of mixture,
on-line conversion in He-stream and isotope ratio measurement), so the
compounds you want to analyze have to be volatile, or you'll have to
transform them into volatile compounds (e.g. derivatization).
GC-Pyrolysis-IRMS systems for del18O (and d2H) analysis are commercially
available today, but the impression I got from talks with colleagues who
work with such a machine  for 18O/16O analysis comes pretty close to what
Arndt Schimmelmann wrote in his answer to your query...
To my knowledge, there's only one reference using GC-Pyrolysis-IRMS for
del18O analysis: Hener et al, Z. Lebensm. Unters. Forsch. A 206, 230
(1998). They analyzed vanillin, but there was no analysis of complex
mixtures. And I'd rather not comment on their relating their values to
their internal lab gas standard... Well, there's no straight forward
solution to the standardization problem of these systems, as long as no
volatile organic reference materials are available.
I guess it tells us a lot that since 1998 these systems are commercially
available, but no other papers from researchers using this technique for
del 18O measurement did follow...
If I missed something out there, please correct me. And maybe some users of
a GC-Pyrolysis-IRMS system for 18O analysis could share their experiences?
Thanks

Barbara

At 17:22 23.02.2000 +0100, you wrote:
>Hi everybody,
>
>Could anyone help me finding information about studies on molecular
>specific d18O in organic matter. Is it possible via IRMS ?
>
>Thanks for advices or references,
>
>Jeremy
>Jeremy JACOB
>Laboratoire Sédimentation et Diagenèse de La Matière Organique
>Université d'Orléans
>Bâtiment Géosciences
>45067 Orléans Cédex 2
>Tel :(0033) (0)2.38.41.71.71 poste 79.05
>Fax :(0033) (0)2.38.41.73.08
>E-mail : [log in to unmask]
>
>
****************************************************************
Dr. Barbara E. Kornexl
UFZ - Umweltforschungzentrum Leipzig-Halle GmbH
Sektion Analytik
Permoserstr. 15
D-04318 Leipzig

Tel.:   ++49/341/235-   2252
Fax:                    2625
E-Mail: [log in to unmask]
*********************************************************************