Assessing the Blank Carbon Contribution, Isotope Mass Balance, and Kinetic Isotope Fractionation of the Ramped Pyrolysis/Oxidation Instrument at Nosams
Bibliographic Data
| ID | 9244757 |
|---|---|
| Authors | Jordon D Hemingway, Valier V Galy, Alan R Gagnon, Katherine E Grant, Sarah Z Rosengard, Guillaume Soulet (0000-0003-2941-6440), Prosper K Zigah, Ann P McNichol (0000-0002-9895-3912) |
| Year | 2017 |
| Volume | 59 |
| Issue | 1 |
| Pages | 179-193 |
| Publication date | 2017-02-01 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Radiocarbon (JOURNAL) |
| Journal identifiers | ISSN: 0033-8222 • E-ISSN: 1945-5755 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.1017/rdc.2017.3 |
| OpenAlex | W2595431165 |
| Language | EN |
| Citations received | 10 |
| References cited | 40 |
We estimate the blank carbon mass over the course of a typical Ramped PyrOx (RPO) analysis (150–1000°C; 5°C×min –1 ) to be (3.7±0.6) μg C with an Fm value of 0.555±0.042 and a δ 13 C value of (–29.0±0.1) ‰ VPDB. Additionally, we provide equations for RPO Fm and δ 13 C blank corrections, including associated error propagation. By comparing RPO mass-weighted mean and independently measured bulk δ 13 C values for a compilation of environmental samples and standard reference materials (SRMs), we observe a small yet consistent 13 C 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 δ 13 C 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 13 C- and 12 C-containing compounds ( 13–12 ∆E ) of 0.3–1.8 J×mol –1 , indicating that blank and mass-balance corrected RPO δ 13 C values accurately retain carbon source isotope signals to within 1–2
Blank · Carbon fibers · Carbon-13 · Carbonate · Chromatography · Fractionation · Isotope · Isotope fractionation · Isotopes of carbon · Kinetic energy · Mass spectrometry · Nuclear physics · Physics · Radiochemistry · Atmospheric and Environmental Gas Dynamics · Chemistry · Groundwater and Isotope Geochemistry · Isotope Analysis in Ecology · Materials Science
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| Unique citing works | 10 |
|---|---|
| Citations per year | 1,25 |
| Citation span | 2018 - 2025 (8) |
| Citation velocity | recent |
| Highly cited | No |
| Citation types | Neutral: 10 |