We were planning to run some cellulose-d18O analyses in our lab, and
I had a question about d18O standards. A number of papers that have
run similar analyses state that they calibrate a working cellulose
standard (e.g. from Aldrich or Sigma) for d18O and use this when
running samples, but the papers don't say what standard they use to
calibrate this working standard.
Cellulose standard IAEA-CH-3 is available from IAEA, but is certified
for d13C only, not d18O. Is there a consensus d18O value that people
use for this standard? Or do people use other certified standards,
such as benzoic acid IAEA-601 (+23.3 per mil), or barium sulfate
NBS-127? (+9.3 per mil)
Thanks in advance for any comments and suggestions.
Research Associate Professor
Dept. of Geological Sciences & Engineering MS-172
University of Nevada - Reno
1664 N. Virginia St.
Reno, NV 89557-0138. USA
Fax: (775) 784-1833
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