rampedpyrox.RpoIsotopes.blank_correct

RpoIsotopes.blank_correct(blk_d13C=(-29.0, 0.1), blk_flux=(0.375, 0.0583), blk_Fm=(0.555, 0.042), bulk_d13C_true=None)[source]

Method to blank- and mass-balance correct raw isotope values.

Parameters:
  • blk_d13C (tuple) – Tuple of the blank d13C composition (VPDB), in the form (mean, stdev.) to be used of blk_corr = True. Defaults to the NOSAMS RPO blank as calculated by Hemingway et al., Radiocarbon 2017.
  • blk_flux (tuple) – Tuple of the blank flux (ng/s), in the form (mean, stdev.) to be used of blk_corr = True. Defaults to the NOSAMS RPO blank as calculated by Hemingway et al., Radiocarbon 2017.
  • blk_Fm (tuple) – Tuple of the blank Fm value, in the form (mean, stdev.) to be used of blk_corr = True. Defaults to the NOSAMS RPO blank as calculated by Hemingway et al., Radiocarbon 2017.
  • bulk_d13C_true (None or array) – True measured d13C value (VPDB) for bulk material as measured independently (e.g. on a EA-IRMS). If not None, this value is used to mass-balance-correct d13C values as described in Hemingway et al., Radiocarbon 2017. If not none, must be inputted in the form [mean, stdev.]

Warning

UserWarning
If already corrected for blank contribution
UserWarning
If already corrected for 13C mass balance

References

[1] J.D. Hemingway et al. (2017) Assessing the blank carbon
contribution, isotope mass balance, and kinetic isotope fractionation of the ramped pyrolysis/oxidation instrument at NOSAMS. Radiocarbon, 59, 179-193.