Citation: JIN Gui-Shan, LIU Han-Bin, ZHANG Jian-Feng, HAN Juan, QIU Lin-Fei, LI Jun-Jie, ZHANG Jia, SHI Xiao. On-line Continuous Flow Analysis of Carbon Isotopic Composition of CO₂ in Fluid Inclusions[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(1): 137-143. doi: 10.19756/j.issn.0253-3820.201363 shu

On-line Continuous Flow Analysis of Carbon Isotopic Composition of CO₂ in Fluid Inclusions

Beijing Research Institute of Uranium Geology, Beijing 100029, China

Corresponding author: LIU Han-Bin, hanbinliu@sina.com
Received Date: 20 June 2020
Revised Date: 30 October 2020

Fund Project: Supported by the National Key Research and Development Project of China (No. 2017YFC0602600).

Generally, the off-line method is used to characterize the carbon isotopic composition of CO₂ enclosed in the mineral fluid inclusions. The enclosed CO₂ is first released by mechanical crushing or thermal decrepitation, and then is collected, purified and measured by isotope ratio mass spectrometer (IRMS). Here, an on-line continuous flow analytic system was developed by linking the thermal decrepitation device and IRMS with Conflo Ⅳ. The gas-liquid inclusions were heated and burst out and the released gas was quickly taken away from the high-temperature area by using high-purity He as carrier gas to reduce the isotope exchange. The gas of CO₂ was collected after cooling with liquid nitrogen and then separated by chromatographic column. The separated CO₂ was analyzed by IRMS with an analysis accuracy of 0.2‰ (1σ). By connecting the measurement needle to the system, it could be used to collect and test CO₂ produced by carbonate reference materials. The results showed that the linear correlation of the calibration curves established by several standards was significant, and the carbon isotopic composition of CO₂ within fluid inclusions could be accurately determined. By using this online method, the operation process was simplified, and the experimental efficiency was greatly improved.
- Fluid inclusions,
- On-line continuous flow,
- Thermal decrepitation,
- Carbon dioxide,
- Carbon isotopic composition
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On-line Continuous Flow Analysis of Carbon Isotopic Composition of CO2 in Fluid Inclusions

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通讯作者: 陈斌, bchen63@163.com

On-line Continuous Flow Analysis of Carbon Isotopic Composition of CO₂ in Fluid Inclusions