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

At 13:11 17.05.00 -0600, you wrote:
>I was wondering if anyone has measured carbon isotope ratios for an IAEA
>standard: cotton cellulose (IAEA-V-9).  It is a reference material for
>trace and minor elements, but I wondered if anyone had measured its delta
>13C.  Please respond directly to me, unless you think everyone is
>interested.
>
>Thanks,
>Franesca
>


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