Effect of Split Ratio on Hydrogen Isotope Ratio Analysis for the Single Molecule Hydrocarbons

LI Zhong-ping; LI Li-wu; TAO Ming-xin; WANG Zuo-dong; WANG Guang; DU Li; ZHANG Ming-feng; SHI Lei

Rock and Mineral Analysis > 2010 > 29(3): 221-224.

LI Zhong-ping, LI Li-wu, TAO Ming-xin, WANG Zuo-dong, WANG Guang, DU Li, ZHANG Ming-feng, SHI Lei. Effect of Split Ratio on Hydrogen Isotope Ratio Analysis for the Single Molecule Hydrocarbons[J]. Rock and Mineral Analysis, 2010, 29(3): 221-224.

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Effect of Split Ratio on Hydrogen Isotope Ratio Analysis for the Single Molecule Hydrocarbons

1.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
2.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
3.
State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
4.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
5.
National Research Center for Geoanalysis, Beijing 100037, China
6.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
7.
Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
8.
China Institute of Atomic Energy, Beijing 102413, China

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Received Date: June 04, 2009
Revised Date: December 20, 2009

Abstract

ABSTRACT

In hydrogen isotope ratio analysis of single molecule hydrocarbons by gas chromatography-high temperature thermal conversion-isotope ratio mass spectrometry, different split ratios (0.1, 0.5, 1.0, 2.0, 5.0 and 10.0)were selected to study the corresponding hydrogen isotope ratios. The results showed that different inlet split ratios influenced in various extents on the peak area and peak width, namely, the peak area and peak width decreased exponentially with the increase of split ratios. Especially when split ratios were less than 1.0, the uncertainty of the hydrogen isotope determination results increased. And when the split ratios were relatively larger, hydrocarbon isotope determination results became stable. The reasons for this phenomenon were also discussed. The research results also showed that in the hydrogen isotope analysis, the choice of a larger split ratio did not lead to significant isotopic fractionation and was more favorable for the sample analysis.
- split,
- ratio,
- isotope,
- ratio,
- mass

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References (8)

References

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