> Dear Willi,
>
> Just additional to the message already I posted, an alinea as given in the
> Chapter 40 of my Book-Volume-I by Manfred Groening, reporting the sources of
> different carbonate standards (what they are, where they were prepared and
> by whom):
>
>   Complementary to NBS 19, an additional calcite material named NBS 18 is
> used as reference material with slightly more negative d13C and d18O values.
> NBS 18 is a carbonatite from Fen, Norway, and was collected by B. Taylor,
> University of California, Davis, USA. It was prepared by H. Friedrichsen,
> University of Tübingen, Germany and I. Friedman, J.R. O¹Neil and G. Cebula,
> USGS (Friedman et al., 1982). NBS 23, a strontium carbonate, was prepared by
> I. Friedman, but its distribution was discontinued due to doubts on its
> isotopic homogeneity. For studies of methane and other 13C depleted
> materials the LSVEC Lithium carbonate is used. LSVEC was originally pre-
> pared as lithium isotope reference material by H. Svec, Iowa State
> University, USA. Because some reference materials were nearing exhaustion,
> three additional materials were introduced: IAEA-CO-1 (Carrara marble) and
> IAEA-CO-8 (calcite from the Kaiserstuhl, Germany), both prepared at the
> IAEA, and IAEA-CO-9 (BaCO3, prepared by C. Brenninkmeijer, IGNS, Lower Hutt,
> New Zealand). Due to the recent discovery of additional batches of NBS 18
> and LSVEC from the original production time, the supply of those reference
> materials is secured for at least ten more years.
> for iAEA produced standards, or else the person(s) who produced the
> materials for composition. Carl Brenninkmeijer is at the Max Planck
> Institute for Chemistry in Mainz now, but you also know that probably.
>
> Best,
> Pier.
>
>
>> I have been trying to find information about the elemental composition
>> of NBS-19 and other calcites like IAEA-CO1 without a lot of success. Can
>> someone push me in the right direction?
Sorry, last sentence must be - something obviously went wrong:

Contact Manfred Groening for IAEA produced standards, or else the person(s)
who produced the materials for composition. Carl Brenninkmeijer is at the
Max Planck Institute for Chemistry in Mainz now, but you also know that
probably.

Pier.


>> Willi
>>
>> --
>> .....................................................................
>>
>> Willi A. Brand, Stable Isotope Laboratory      [log in to unmask]
>>
>> Max-Planck-Institute for Biogeochemistry
>>
>> Beutenberg Campus
>> Hans-Knoell-Str. 10, 07745 Jena, Germany      Tel: +49-3641-576400
>> P.O.Box 100164,      07701 Jena, Germany      Fax: +49-3641-57-70
>>
>>   http://www.bgc-jena.mpg.de/
>>   http://www.bgc-jena.mpg.de/service/iso_gas_lab/
>>
>> .....................................................................
>>
>