Determination of carbon isotopic composition of individual light hydrocarbons evolved from pyrolysis of source rocks by using GC-IRMS

2000 ◽  
Vol 45 (S1) ◽  
pp. 7-10 ◽  
Author(s):  
Ansong Geng ◽  
Yongqiang Xiong
Keyword(s):  
Isotopic Composition ◽  
Carbon Isotopic Composition ◽  
Source Rocks ◽  
Light Hydrocarbons ◽  
Carbon Isotopic

New equation to decipher the relationship between carbon isotopic composition of methane and maturity of gas source rocks

2021 ◽  
Vol 64 (3) ◽  
pp. 470-493 ◽  
Author(s):  
Jianping Chen ◽  
Xulong Wang ◽  
Jianfa Chen ◽  
Yunyan Ni ◽  
Baoli Xiang ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Carbon Isotopic Composition ◽  
Source Rocks ◽  
Carbon Isotopic ◽  
Gas Source ◽  
New Equation ◽  
The Relationship

scholarly journals Stable carbon isotopic composition of light hydrocarbons and n-alkanes of condensates in the Tarim Basin, NW China

2017 ◽  
Vol 2 (3) ◽  
pp. 165-177 ◽  
Author(s):  
Shipeng Huang ◽  
Chenchen Fang ◽  
Weilong Peng ◽  
Qingchun Jiang ◽  
Ziqi Feng
Keyword(s):  
Isotopic Composition ◽  
Tarim Basin ◽  
Carbon Isotopic Composition ◽  
Stable Carbon ◽  
Light Hydrocarbons ◽  
Nw China ◽  
Carbon Isotopic

scholarly journals A high volume sampling system for isotope determination of volatile halocarbons and hydrocarbons

2011 ◽  
Vol 4 (10) ◽  
pp. 2073-2086 ◽  
Author(s):  
E. Bahlmann ◽  
I. Weinberg ◽  
R. Seifert ◽  
C. Tubbesing ◽  
W. Michaelis
Keyword(s):  
Isotopic Composition ◽  
Carbon Isotopic Composition ◽  
High Volume ◽  
Isotope Ratios ◽  
Urban Site ◽  
Sampling System ◽  
Mixing Ratios ◽  
Carbon Isotopic ◽  
Promising Tool

Abstract. The isotopic composition of volatile organic compounds (VOCs) can provide valuable information on their sources and fate not deducible from mixing ratios alone. In particular the reported carbon stable isotope ratios of chloromethane and bromomethane from different sources cover a δ13C-range of almost 100‰ making isotope ratios a very promising tool for studying the biogeochemistry of these compounds. So far, the determination of the isotopic composition of C1 and C2 halocarbons others than chloromethane is hampered by their low mixing ratios. In order to determine the carbon isotopic composition of C1 and C2 halocarbons with mixing ratios as low as 1 pptv (i) a field suitable cryogenic high volume sampling system and (ii) a chromatographic set up for processing these samples have been developed and validated. The sampling system was tested at two different sampling sites, an urban and a coastal location in Northern Germany. The average δ13C-values for bromomethane at the urban site were −42.9 ± 1.1‰ and agreed well with previously published results. But at the coastal site bromomethane was substantially enriched in 13C by almost 10‰. Less pronounced differences were observed for chlorodifluoromethane, 1,1,1-trichloroethane and chloromethane. We suggest that these differences are related to the turnover of these compounds in ocean surface waters. Furthermore we report first carbon isotope ratios for iodomethane (−40.4‰ to −79.8‰), bromoform (−13.8‰ to 22.9‰), and other halocarbons.

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