A Carrara marble supplied to IAEA by IMEG, Viareggio, Italy, was originally intended as 14C quality control material IAEA-C1. The fraction of the material ground to a fine powder with grain size below 100 μm is called IAEA-CO-1 and is intended for stable isotope measurements . Its recommended δ13C value was determined in an international calibration . The recommended δ18O value is a mean from data of an interlaboratory comparison .
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
STICHLER, W., Interlaboratory comparison of new materials for carbon and oxygen ratio measurements, Proceedings of a consultants' meeting held in Vienna, 1 - 3. Dec. 1993. IAEA-TECDOC-825, IAEA, Vienna, Austria (1995) 67-74.
COPLEN, T.B., BRAND, W.A., GEHRE, M., GRÖNING, M., MEIJER, H.A.J., TOMAN, B., VERKOUTEREN, R.M., New guidelines for 13C measurements, Anal. Chem. 78 7 (2006) 2439-2441.