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Establishing Accuracy of Position-Specific Carbon Isotope Analysis of Propane by GC-Pyrolysis-GC-IRMS
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  • Changjie Liu,
  • Peng liu,
  • Xiaofeng Wang,
  • Xiaoqiang Li,
  • Juske Horita
Changjie Liu
Northwest Institute of Eco-Environment and Resources
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Peng liu
Xi'an University of Science and Technology

Corresponding Author:[email protected]

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Xiaofeng Wang
Northwest University
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Xiaoqiang Li
Texas Tech University
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Juske Horita
Texas Tech University
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Rationale: Position-Specific (PS) δ13C values of propane has proven its ability to provide valuable information on evolution history of natural gases. Two major approaches to measure PS δ13C values of propane are quantitative NMR (qNMR) and GC-Py(rolysis)-GC-IRMS. The qNMR has verified measurement accuracy, however, required large sample size and long experimental time limit its applications. The GC-Py-GC-IRMS is more versatile method with small sample size, but its accuracy has not been demonstrated. Methods: We measured PS δ13C values of propane from nine natural gases, using the both methods and evaluated the accuracy of GC-Py-GC-IRMS method. Results: The results show that large carbon isotope fractionations occurred for the both terminal and central carbons within propane during pyrolysis. The isotope fractionations during the pyrolysis are reproducible at optimum conditions, but vary between the two GC-Py-GC-IRMS systems tested, affected by experimental conditions (e.g., pyrolysis temperature, flow rate, and reactor conditions). Conclusions: Therefore, it is necessary to evaluate and calibrate each GC-Py-GC-IRMS system using propane gases whose PS δ13C values are accurately determined. This study also highlights a need of PS isotope standards for propane and other molecules.
04 Dec 2022Submitted to Rapid Communications in Mass Spectrometry
04 Dec 2022Submission Checks Completed
04 Dec 2022Assigned to Editor
04 Dec 2022Review(s) Completed, Editorial Evaluation Pending
04 Dec 2022Reviewer(s) Assigned
01 Feb 2023Editorial Decision: Revise Minor
03 Feb 20231st Revision Received
03 Feb 2023Submission Checks Completed
03 Feb 2023Assigned to Editor
03 Feb 2023Review(s) Completed, Editorial Evaluation Pending
05 Feb 2023Reviewer(s) Assigned
14 Feb 2023Editorial Decision: Revise Minor
14 Feb 20232nd Revision Received
14 Feb 2023Submission Checks Completed
14 Feb 2023Assigned to Editor
14 Feb 2023Review(s) Completed, Editorial Evaluation Pending
14 Feb 2023Editorial Decision: Accept