IAEA-CO-8 , Calcite

Inorganic , Mineral

The reference material IAEA-CO-8* is a natural carbonatite originating from Schelingen at the Kaiserstuhl, Germany. The material was ground to a grain size from 0.09 to 0.5 mm and put at the IAEA’s disposal by Geologisches Landesamt, Freiburg, Germany [1]. Its recommended δ13C value was determined in an international calibration [2]. The recommended δ18O value is a mean from data of an interlaboratory comparison [1].

Analyte Value Unit SD R/I/C
δ13C -5.764 VPDB 0.032 C
δ18O -22.7 VPDB 0.2 R

(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
[*] previously identified as IAEA-KST


  1. 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.

  2. 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.

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