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dc.contributor.authorHemingway, Jordon D.  Concept link
dc.contributor.authorGaly, Valier  Concept link
dc.contributor.authorGagnon, Alan R.  Concept link
dc.contributor.authorGrant, Katherine E.  Concept link
dc.contributor.authorRosengard, Sarah Z.  Concept link
dc.contributor.authorSoulet, Guillaume  Concept link
dc.contributor.authorZigah, Prosper  Concept link
dc.contributor.authorMcNichol, Ann P.  Concept link
dc.date.accessioned2017-04-28T15:51:19Z
dc.date.available2017-09-16T08:31:49Z
dc.date.issued2017-03
dc.identifier.urihttps://hdl.handle.net/1912/8953
dc.descriptionAuthor Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Radiocarbon 59 (2017): 179-193, doi:10.1017/RDC.2017.3.en_US
dc.description.abstractWe estimate the blank carbon mass over the course of a typical Ramped PyrOx (RPO) analysis (150 to 1000 °C; 5 °C×min-1) to be (3.7 ± 0.6) μg C with an Fm value of 0.555 ± 0.042 and a δ13C value of (-29.0 ± 0.1) ‰ VPDB. Additionally, we provide equations for RPO Fm and δ13C blank corrections, including associated error propagation. By comparing RPO mass-weighted mean and independently measured bulk δ13C values for a compilation of environmental samples and standard reference materials (SRMs), we observe a small yet consistent 13C depletion within the RPO instrument (mean – bulk: μ = -0.8 ‰; ±1σ = 0.9 ‰; n = 66). In contrast, because they are fractionation-corrected by definition, mass-weighted mean Fm values accurately match bulk measurements (mean – bulk: μ = 0.005; ±1σ = 0.014; n = 36). Lastly, we show there exists no significant intra-sample δ13C variability across carbonate SRM peaks, indicating minimal mass-dependent kinetic isotope fractionation during RPO analysis. These data are best explained by a difference in activation energy between 13C- and 12C-containing compounds (13–12ΔE) of 0.3 to 1.8 J×mol-1, indicating that blank and mass-balance corrected RPO δ13C values accurately retain carbon source isotope signals to within 1 to 2‰.en_US
dc.description.sponsorshipJ.D.H. was partly supported by the NSF Graduate Research Fellowship Program under grant number 2012126152; V.V.G. was partly supported by the US National Science Foundation (grants OCE- 0851015 and OCE-0928582), the WHOI Coastal Ocean Institute (grant 27040213) and an Independent Study Award (grant 27005306) from WHOI; G.S. and P.K.Z. were supported by the WHOI Postdoctoral Scholar Program with funding provided by NOSAMS (OCE-1239667).en_US
dc.language.isoen_USen_US
dc.relation.urihttps://doi.org/10.1017/RDC.2017.3
dc.titleAssessing the blank carbon contribution, isotope mass balance, and kinetic isotope fractionation of the Ramped Pyrolysis/Oxidation instrument at NOSAMSen_US
dc.typePreprinten_US


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