Dear Simon:

The Analytical Quality Control Services of the IAEA in Vienna offer a
standard water IAEA 302 A with a del 2-H value of approx. +500 per mil and a
second standard water IAEA 302 B with a del 2-H value of approx. +1000 per
mil. The description of the material and a compilation of the results from
isotopic measurements of ten different laboratories along with the
recommended del 2-H values is summarized in the following report:

Intercomparison of enriched stable isotope reference materials for medical
and biological studies

by R. M. Parr and S. A. Clements

IAEA NAHRES-5, Vienna. 1991.

Regards,

Bernhard


>Dear All,
>
>I am currently running enriched water samples containing enriched levels of D
>and 18O of up to +1000 ppm (relative to SMOW).  I am reliably informed by Steve
>Crowley, and others, that it is unwise to assume linearity of the mass spec
over
>this range making SMOW, SLAP and GISP unreliable standards.  Does any one know
>of a reliable method of creating enriched standards or a source where they
could
>be purchased.  Thanks.
>
>
>
>Simon
>
>
>
>Dr Simon Davis
>Liverpool JMU energetics lab
>B.E.S
>Liverpool John Moores University
>Liverpool
>England
>L3 3AF
>
>
>
************************************************************
Bernhard Mayer
Lehrstuhl f. Sediment u. Isotopengeologie
Institut fuer Geologie
Ruhr-Universitaet Bochum
Universitaetsstr. 150
44780 Bochum

Germany

Office: (49)-234-700-5458   
Lab: (49)-234-700-5462
Secret.: (49)-234-700-3250
FaxNo: (49)-234-709-4571
E-mail: [log in to unmask]

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