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Dear Kim,
In Lyon we use the standard NBS 120c which is a Florida phosphorite. We
precipitate phosphates as Ag3PO4 and some published values of this standard
(about 21.7) are available along with technical considerations in the
following paper:
Lecuyer C., Grandjean P., O'Neil J.R., Cappetta H. and Martineau F. 1993.
Thermal oceanic excursions at the Cretaceous-Tertiary boundary: The d18O
records of phosphatic fish debris (northern Morocco). Palaeogeog.
Palaeoclimatol. Palaeoecol., 105: 235-243.
You may also contact A. Longinelli's team in Trieste for BiPO4 samples.
If it can be useful, Ag3PO4 from NBS 120c processed in Lyon may be
available upon request.
Best regards
Christophe
Dr. Christophe Lecuyer
Laboratoire de Sciences de la Terre
CNRS UMR 5570
Ecole Normale Superieure de Lyon
46 Allee d'Italie
69364 Lyon cedex 07, France
Fax: 04 72 72 86 77
For foreign countries: 33 4 72 72 86 77
Tél: 04 72 72 84 13
For foreign countries: 33 4 72 72 84 13
e-mail: [log in to unmask]
http://www.ens-lyon.fr/~clecuyer
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