Stable Isotope Geochemistry


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Received: from ( []) by (AIX4.2/UCB 8.7/8.7) with SMTP id FAA17710 for <[log in to unmask]>; Fri, 8 Nov 1996 05:18:23 -0500 (EST) from ir200 by with smtp (Exim 0.571 #1) id 0vLo5T-0003Ex-00; Fri, 8 Nov 1996 10:22:59 +0000
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Date: Fri, 8 Nov 1996 10:22:59 +0000 (GMT)
Reply-To: Iain <[log in to unmask]>
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	As far as I'm aware the IAEA C3 standard is holocellulose rather
than alpha-cellulose. Therefore there will be some hemicelluloses present
and it will not be truly homogeneous. However, these differences in
structure may not be significant. We measured the 13C/12C values from a
nitrated sample of it: 

Mean       -24.78
n          14
s.d.(n-1)  0.11

However, 13C/12C values from nitrated samples would appear to be depleted
by 0.30 per mille (Palaoklimaforschung 15, 141-155). 
	We decided to use a commercial alpha-cellulose as a standard
(Sigma Cellulose ref 92F 0243) and typically have a precision of 0.05 per
mille on 13C/12C measurements... Let me know if you want some. Best


Iain Robertson                                + 
Godwin Institute for Quaternary Research,     +
University of Cambridge, Free School Lane,    + Tel. ++ 44 (0)1223 334881 
Cambridge, UNITED KINGDOM CB2 3RS             + Fax. ++ 44 (0)1223 334871 
Godwin Institute homepage