> Dear Francesca,
> What about the IAEA C3 Cellulose Standard (in the form of paper), which is
> meant to be for 14C sample pretreatment intercomparisons, but could be used
> just as well for stable isotopes...... It has an already well-restrained
> Del13C.
> Best regards,
> GJ
>
Dear cellulose combusters !

As far as I know the IAEA considered to prepare the distribution of
C3 cellulose as standard for 13 C and 18 O after testing (and further
homogenization ?) years ago. It never happened, though.

In 1997 I distributed some C3 through the list myself to see how
homogeneous the material really is. It turned out to be reasonably
well homogeneous (see postings of  97/03/07 in the archive and
Radiocarbon, 34/1992). Further testing of C3 by the IAEA as announced
in the posting of 97/93/97 by M. Groening either were not
succesful or were never carried ou at all.

Frank Pawellek


Frank Pawellek
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Frank Pawellek
Institut fuer Geologie
Lehrstuhl fuer Sediment- und Isotopengeologie
Ruhr-Universitaet Bochum
Universitaetsstrasse 150
44801 Bochum
Germany
Phone: +49-234-32-25458
Fax: +49-234-32-14571
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