Study on the Optimal Reaction Temperature and Sampling Weight for Measurement of Carbon and Nitrogen Isotope Ratio by Elemental Analyzer-Isotope Ratio Mass Spectrometer

Li XU; Lan-tian XING; Xin WANG; Zhong-ping LI; Jun-li MAO

doi:10.15898/j.cnki.11-2131/td.201701130005

Rock and Mineral Analysis > 2018 > 37(1): 15-20. > DOI: 10.15898/j.cnki.11-2131/td.201701130005

Li XU, Lan-tian XING, Xin WANG, Zhong-ping LI, Jun-li MAO. Study on the Optimal Reaction Temperature and Sampling Weight for Measurement of Carbon and Nitrogen Isotope Ratio by Elemental Analyzer-Isotope Ratio Mass Spectrometer[J]. Rock and Mineral Analysis, 2018, 37(1): 15-20. DOI: 10.15898/j.cnki.11-2131/td.201701130005

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Study on the Optimal Reaction Temperature and Sampling Weight for Measurement of Carbon and Nitrogen Isotope Ratio by Elemental Analyzer-Isotope Ratio Mass Spectrometer

1.
Northwest Branch, Research Institute of Petroleum Exploration and Development, Lanzhou 730020, China
2.
Gansu Provincial Key Laboratory of Petroleum; Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
3.
The No.2 Institute, Gansu Bureau of Geology and Mineral Exploration and Development, Lanzhou 730020, China

More Information

Received Date: January 12, 2017
Revised Date: November 30, 2017
Accepted Date: December 10, 2017
Published Date: December 31, 2017

Abstract

Highlights
· The optimum condition such as reaction temperature for carbon and nitrogen isotope measurement by EA-IRMS is studied through a series of experiments.

· By improving reaction temperature, a higher precision has kept during sample testing.

· It was obtained that the linear relationship between nitrogen content and detection limit. According to the relationship, the sample introduction quantity can be determined when analyzing nitrogen isotope.

ABSTRACT

Carbon and nitrogen isotopes are essential tools to study paleoclimate, palaeoenvironment, and ecosystem. At present, carbon and nitrogen isotopes are commonly determined by Elemental Analyzer-Isotope Ratio Mass Spectrometer (EA-IRMS). Reaction temperature and sampling weight directly affect the burning of samples, and thus affect analytical precision. Using EA-IRMS technology and taking standard samples as references, the carbon and nitrogen isotope values were determined at different conversion temperatures to study the optimum reaction temperature, in order to ensure the accuracy of the analysis presented in this paper. At the same time, by analyzing the detection limits of samples with different nitrogen contents, the relationship between the nitrogen content of the sample and the lowest detection limit was determined and thus the lowest quantity of samples for accurate determination of nitrogen isotopes were also defined. The results show that reaction temperature has a significant effect on analytical precision. Analytical precision of carbon isotope is less than ±0.2‰ when the reaction temperature is either 900℃ or higher than 900℃, but the precision of nitrogen isotope can reach ±0.3‰ only when the reaction temperature is no lower than 950℃. The linear relationship between nitrogen content and detection limit was expressed as R²=0.873 according to the data. According to this relationship, the sample introduction quantity can be determined and controlled when analyzing nitrogen isotope.
- Elemental Analyzer-Isotope Ratio Mass Spectrometer,
- carbon and nitrogen isotope ratio,
- reaction temperature,
- detection limit

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References (15)

References

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Study on the Optimal Reaction Temperature and Sampling Weight for Measurement of Carbon and Nitrogen Isotope Ratio by Elemental Analyzer-Isotope Ratio Mass Spectrometer

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