IAEA-603

• Unit Size: 0.5 g
• Price per Unit: 250 EUR
• Report: S. Assonov et al. 2020 (link)
• Date of Release: 8/28/2016
• Reference Sheet: download (pdf)
• Contact point: Analytical-Reference-Materials.Contact-Point@iaea.org

The reference material IAEA-603 was developed to replace the quarantined reference material NBS 19 and to serve as the highest-level metrological reference material for the practical realization of the VPDB and VPDB-LSVEC δ(¹³C) scales and VPDB and VPDB-CO₂ δ(¹⁸O) scales.

Certified values of IAEA-603

Note: For δ(¹³C), currently two scales exist and are in use: VPDB and VPDB-LSVEC.  δ(¹³C) values reported on the VPDB and VPDB-LSVEC scale can differ, with maximum reported differences (VPDB minus VPDB-LSVEC) of +0.3 ‰ for materials with carbon isotope delta values around –45 ‰ and negligible difference (below current analytical combined uncertainty) at carbon isotope delta values close to zero [https://doi.org/10.1002/rcm.10018)]. 

End users should state the values of reference materials used to normalize isotope data following the minimum requirements established by IUPAC [https://doi.org/10.1515/pac-2021-1108] and in the case of carbon, whether they are publishing δ(¹³C) values on the VPDB scale or the VPDB-LSVEC scale. Users should ensure that in one calibration they only use values for reference materials assigned on one scale.