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Measurement of position-specific 13C isotopic composition of propane at the nanomole level.

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Title: Measurement of position-specific 13C isotopic composition of propane at the nanomole level.
Authors: Gilbert, Alexis1 gilbert.alexis@elsi.jp, Yamada, Keita2, Suda, Konomi3, Ueno, Yuichiro1,3, Yoshida, Naohiro1,2
Source: Geochimica et Cosmochimica Acta. Mar2016, Vol. 177, p205-216. 12p.
Subjects: Carbon isotopes, Propane, Methyl groups, Isotopic fractionation, Natural gas
Abstract: We have developed a novel method for analyzing intramolecular carbon isotopic distribution of propane as a potential new tracer of its origin. The method is based on on-line pyrolysis of propane followed by analysis of carbon isotope ratios of the pyrolytic products methane, ethylene and ethane. Using propane samples spiked with 13 C at the terminal methyl carbon, we characterize the origin of the pyrolytic fragments. We show that the exchange between C-atoms during the pyrolytic process is negligible, and thus that relative intramolecular isotope composition can be calculated. Preliminary data from 3 samples show that site-preference (SP) values, defined as the difference of δ 13 C values between terminal and sub-terminal C-atom positions of propane, range from −1.8‰ to −12.9‰. In addition, SP value obtained using our method for a thermogenic natural gas sample is consistent with that expected from theoretical models of thermal cracking, suggesting that the isotope fractionation associated with propane pyrolysis is negligible. The method will provide novel insights into the characterization of the origin of propane and will help better understand the biogeochemistry of natural gas deposits. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 113374543
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Measurement of position-specific 13C isotopic composition of propane at the nanomole level.
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  Data: <searchLink fieldCode="AR" term="%22Gilbert%2C+Alexis%22">Gilbert, Alexis</searchLink><relatesTo>1</relatesTo><i> gilbert.alexis@elsi.jp</i><br /><searchLink fieldCode="AR" term="%22Yamada%2C+Keita%22">Yamada, Keita</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Suda%2C+Konomi%22">Suda, Konomi</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ueno%2C+Yuichiro%22">Ueno, Yuichiro</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Yoshida%2C+Naohiro%22">Yoshida, Naohiro</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Mar2016, Vol. 177, p205-216. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+isotopes%22">Carbon isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Propane%22">Propane</searchLink><br /><searchLink fieldCode="DE" term="%22Methyl+groups%22">Methyl groups</searchLink><br /><searchLink fieldCode="DE" term="%22Isotopic+fractionation%22">Isotopic fractionation</searchLink><br /><searchLink fieldCode="DE" term="%22Natural+gas%22">Natural gas</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We have developed a novel method for analyzing intramolecular carbon isotopic distribution of propane as a potential new tracer of its origin. The method is based on on-line pyrolysis of propane followed by analysis of carbon isotope ratios of the pyrolytic products methane, ethylene and ethane. Using propane samples spiked with 13 C at the terminal methyl carbon, we characterize the origin of the pyrolytic fragments. We show that the exchange between C-atoms during the pyrolytic process is negligible, and thus that relative intramolecular isotope composition can be calculated. Preliminary data from 3 samples show that site-preference (SP) values, defined as the difference of δ 13 C values between terminal and sub-terminal C-atom positions of propane, range from −1.8‰ to −12.9‰. In addition, SP value obtained using our method for a thermogenic natural gas sample is consistent with that expected from theoretical models of thermal cracking, suggesting that the isotope fractionation associated with propane pyrolysis is negligible. The method will provide novel insights into the characterization of the origin of propane and will help better understand the biogeochemistry of natural gas deposits. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.gca.2016.01.017
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 205
    Subjects:
      – SubjectFull: Carbon isotopes
        Type: general
      – SubjectFull: Propane
        Type: general
      – SubjectFull: Methyl groups
        Type: general
      – SubjectFull: Isotopic fractionation
        Type: general
      – SubjectFull: Natural gas
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      – TitleFull: Measurement of position-specific 13C isotopic composition of propane at the nanomole level.
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              Text: Mar2016
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