Inter-laboratory calibration of natural gas round robins for δ2H and δ13C using off-line and on-line techniques
Chemical Geology
By: Jinxing Dai, Xinyu Xia, Zhisheng Li, Dennis D. Coleman, Robert F. Dias, Ling Gao, Jian Li, Andrei Deev, Jin Li, Daniel Dessort, Dominique Duclerc, Liwu Li, Jinzhong Liu, Stefan Schloemer, Wenlong Zhang, Yunyan Ni, Guoyi Hu, Xiaobo Wang, and Yongchun Tang
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Abstract
Compound-specific carbon and hydrogen isotopic compositions of three natural gas round robins were calibrated by ten laboratories carrying out more than 800 measurements including both on-line and off-line methods. Two-point calibrations were performed with international measurement standards for hydrogen isotope ratios (VSMOW and SLAP) and carbon isotope ratios (NBS 19 and L-SVEC CO2). The consensus δ13C values and uncertainties were derived from the Maximum Likelihood Estimation (MLE) based on off-line measurements; the consensus δ2H values and uncertainties were derived from MLE of both off-line and on-line measurements, taking the bias of on-line measurements into account. The calibrated consensus values in ‰ relative to VSMOW and VPDB are:
NG1 (coal-related gas):
Methane: δ2HVSMOW = − 185.1‰ ± 1.2‰, δ13CVPDB = − 34.18‰ ± 0.10‰
Ethane: δ2HVSMOW = − 156.3‰ ± 1.8‰, δ13CVPDB = − 24.66‰ ± 0.11‰
Propane: δ2HVSMOW = − 143.6‰ ± 3.3‰, δ13CVPDB = − 22.21‰ ± 0.11‰
i-Butane: δ13CVPDB = − 21.62‰ ± 0.12‰
n-Butane: δ13CVPDB = − 21.74‰ ± 0.13‰
CO2: δ13CVPDB = − 5.00‰ ± 0.12‰
NG2 (biogas):
Methane: δ2HVSMOW = − 237.0‰ ± 1.2‰, δ13CVPDB = − 68.89‰ ± 0.12‰
NG3 (oil-related gas):
Methane: δ2HVSMOW = − 167.6‰ ± 1.0‰, δ13CVPDB = − 43.61‰ ± 0.09‰
Ethane: δ2HVSMOW = − 164.1‰ ± 2.4‰, δ13CVPDB = − 40.24‰ ± 0.10‰
Propane: δ2HVSMOW = − 138.4‰ ± 3.0‰, δ13CVPDB = − 33.79‰ ± 0.09‰
All of the assigned values are traceable to the international carbon isotope standard of VPDB and hydrogen isotope standard of VSMOW.
Suggested Citation
Dai, J., Xia, X., Li, Z., Coleman, D.D., Dias, R.F., Gao, L., Li, J., Deev, A., Li, J., Dessort, D., Duclerc, D., Li, L., Liu, J., Schloemer, S., Zhang, W., Ni, Y., Hu, G., Wang, X., and Tang, Y., 2012, Inter-laboratory calibration of natural gas round robins for δ2H and δ13C using off-line and on-line techniques: Chemical Geology, v. 310-311, p. 49-55, https://doi.org/10.1016/j.chemgeo.2012.03.008.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Inter-laboratory calibration of natural gas round robins for δ2H and δ13C using off-line and on-line techniques |
| Series title | Chemical Geology |
| DOI | 10.1016/j.chemgeo.2012.03.008 |
| Volume | 310-311 |
| Year Published | 2012 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Central Energy Resources Science Center |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Chemical Geology |
| First page | 49 |
| Last page | 55 |