Christine
An old reference - not calibrated to V-PDB but quite a tight definition of
NBS 21
Schoell M, Faber E and Coleman M L (1983) An inter-laboratory comparison
of the carbon and hydrogen isotopic composition of the NBS22 and NBS21
standards. Organic Geochemistry 5 3-6.
Max
>Dear listmembers
>
>I am looking for the d13C value of NBS21, a graphite standard now
>replaced by USGS-24 in recent compilations of standard references. I
>would be grateful to anyone who can provide me some data or
>bibliographic references.
>
>Christine FLEHOC
>BRGM - SMN/ANA/ISO
>3 Ave C. Guillemin
>B.P. 6009
>45060 ORLEANS cedex 2 FRANCE
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