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. Author manuscript; available in PMC: 2023 May 3.
Published in final edited form as: Anal Chem. 2022 Apr 18;94(17):6446–6450. doi: 10.1021/acs.analchem.1c05458

Table 1.

R18O (12C18O16O/12C16O2), R13C (13C16O2/12C16O2), and R17O (12C17O16O/12C16O2) from the TILDAS Systema

standard n CaCO3 (μg) R18O R18O ± 1S.E R13C R13C ± 1S.E R17O R17O ± 1S.E cell pressure (Torr) cell temp (K) accepted δ18OVPDB accepted δ13CVPDB
JNOC-86 2 2.1 0.9848 0.0015 1.0061 0.0016 1.1604 0.0507 15.11 297.614 0.538 2.595
Bio-Std 2 3.3 0.9794 0.0010 0.9972 0.0004 1.1441 0.0140 15.09 297.622 −5.56 −2.91
LSVEC 2 2.3 0.9596 0.0019 0.9651 0.0033 1.0536 0.0205 15.08 297.661 −26.7 −46.6
a

Cell pressure (Torr), cell temperature (K), and calculated isotopic values obtained from the TILDAS system are also shown. Accepted d values are reported by IRMS. R18O, R13C, and R17O are normalized at 15.0 Torr in total pressure and 297.65 K (24.5 °C) conditions.