Please note that BaSO4 standard NBS-127 is no longer +9.3%o vs. VSMOW,
but +8.73+/-0.05%o, see Halas et al. (2007) Geostandards and Geoanal.
Res., vol. 31,61-68.
At 19:56 08-03-24, you wrote:
>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
>[log in to unmask]
Dr. Stanislaw Halas
Mass Spectrometry Laboratory
Institute of Physics, UMCS
20-031 Lublin, Poland
phone: +48 81 537-62-75
fax: +48 81 533-36-69