Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Liu, Wen1,2,3; Li, Yun1,2 ; Jiang, Wenmin1,2; Xiong, Yongqiang1,2
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| Determination of intermolecular and intramolecular isotopic compositions of low-abundance gaseous hydrocarbons using an online hydrocarbon gas concentration method | |
| Source Publication | JOURNAL OF CHROMATOGRAPHY A
 |
| ISSN | 0021-9673 |
| 2023-09-13 | |
| Volume | 1706Pages:5 |
| DOI | 10.1016/j.chroma.2023.464250 |
| Language | 英语 |
| WOS Research Area | Biochemistry & Molecular Biology ; Chemistry |
| Abstract | The stable isotopic composition of natural gas can be used to identify its origin and source. However, low concentrations of gaseous hydrocarbons in high-mature natural and shale gases hinder accurate determination of their compound-and position-specific isotopic compositions. In this study, an online C2+ hydrocarbon gas concentration system combined with gas chromatography-isotope ratio mass spectrometry (GC-IRMS) or gas chromatography-pyrolysis-gas chromatography-isotope ratio mass spectrometry (GC-Py-GC-IRMS) was developed to determine compound-and position-specific isotopic compositions of low-abundance gaseous hydrocarbons. The lower limit of the gas concentration required for isotope ratio determination using the online concentration system is 0.001% (0.003%) for compound-specific carbon (hydrogen) isotopes and 0.005% for position-specific carbon isotopes and is thus applicable to most natural gas samples. The online concentration technique does not cause significant isotopic fractionation effects, and the combination with GC-IRMS and GC-Py-GC-IRMS can accurately and precisely determine the compound-specific 813C and 8D values of low content C2+ gaseous hydrocarbons and the position-specific 813C values (813Ca, 813Cb, and SP values) of propane in low-content propane samples, respectively. The application of our method to two natural gas samples from the Ordos and Sichuan basins further confirms that the online concentration method allows simple and rapid determination of the compound-and position-specific isotopic compositions of low-abundance gaseous hydrocarbons. |
| Keyword | Natural gas Low-abundance gaseous hydrocarbons Compound-specific isotopic analyses Position-specific isotopic analyses Online concentration system |
| WOS ID | WOS:001051530700001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/74699 |
| Collection | 有机地球化学国家重点实验室 |
| Corresponding Author | Li, Yun; Jiang, Wenmin |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Liu, Wen,Li, Yun,Jiang, Wenmin,et al. Determination of intermolecular and intramolecular isotopic compositions of low-abundance gaseous hydrocarbons using an online hydrocarbon gas concentration method[J]. JOURNAL OF CHROMATOGRAPHY A,2023,1706:5. |
| APA | Liu, Wen,Li, Yun,Jiang, Wenmin,&Xiong, Yongqiang.(2023).Determination of intermolecular and intramolecular isotopic compositions of low-abundance gaseous hydrocarbons using an online hydrocarbon gas concentration method.JOURNAL OF CHROMATOGRAPHY A,1706,5. |
| MLA | Liu, Wen,et al."Determination of intermolecular and intramolecular isotopic compositions of low-abundance gaseous hydrocarbons using an online hydrocarbon gas concentration method".JOURNAL OF CHROMATOGRAPHY A 1706(2023):5. |
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