Method for analyzing stable isotope ratio of CO2 based on chromatography-mass spectrometry

A stable isotope, carbon dioxide technology, applied in the direction of analysis of materials, material separation, measurement devices, etc., can solve the problem of insufficient detailed expression of carbon dioxide source, single, etc., and achieve good application prospects and simple methods.

Inactive Publication Date: 2012-07-11
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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Problems solved by technology

However, in animals and plants with rich sources of carbon dioxide, it is obvious that a C of carbon dioxid

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  • Method for analyzing stable isotope ratio of CO2 based on chromatography-mass spectrometry
  • Method for analyzing stable isotope ratio of CO2 based on chromatography-mass spectrometry
  • Method for analyzing stable isotope ratio of CO2 based on chromatography-mass spectrometry

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Embodiment Construction

[0024] Chromatography-mass spectrometry analysis carbon dioxide stable isotope ratio method, comprising the following steps:

[0025] ⑴Establish a mathematical model of carbon dioxide stable isotope ratio:

[0026] According to the carbon dioxide molecule is composed of five stable isotopes C 12 、C 13 , O 16 , O 17 , O 18 Element composition, under different conditions, 12 carbon, oxygen and carbon dioxide molecules with different mass numbers will be formed, namely Table 1:

[0027]

[0028] Accordingly, 15 stable isotope ratios of carbon dioxide can be obtained, namely Table 2:

[0029] .

[0030] ⑵ Make the purity less than 10 -5 % of the carrier gas passes through the purifier at an output pressure of 0.20~0.60 MPa, so that the purity of the purified carrier gas is less than 10 -6 % or 10 -7 %.

[0031] (3) Pass the purified carrier gas into the chromatographic column of the gas chromatograph where the sample to be tested is placed at a flow rate of 25~195ml...

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Abstract

The invention relates to a method for analyzing the stable isotope ratio of CO2 based on chromatography-mass spectrometry. The method comprises the following steps: firstly, building a mathematical model for the stable isotope ratio of CO2; secondly, purifying the carrier gas with purity lower than 10 <-5> percent with a purifier, so that the purity of the purified carrier gas is lower than 10 <-6> percent or 10 <-7> percent; thirdly, introducing the purified carrier gas in a gas chromatograph and a chromatographic column where a to-be-tested sample is placed, and then measuring the CO2 in the to-be-tested sample through a mass detector after adsorption and desorption, so as to obtain the mass number (44, 45, 46, 47, 48 and 49) of CO2 in the to-be-tested gas; and fourthly, performing substitution of the mass number (44, 45, 46, 47, 48 and 49) of CO2 in the to-be-tested gas in Table 2 to obtain 15 isotope ratios of CO2. The method achieves the purpose of subtly expressing the CO2 source by building the mathematical model, and can be applied to non-invasive detection in human health, human body medicine and planet and animal studies.

Description

technical field [0001] The invention relates to the field of carbon dioxide stable isotope research, in particular to a chromatographic-mass spectrometry method for analyzing carbon dioxide stable isotope ratios. Background technique [0002] Stable isotopes of carbon and oxygen in carbon dioxide molecules are tracers for the study of ecosystem and atmospheric material circulation and flux. Previously in this field by detecting the C of carbon dioxide 13 / C 12 isotope ratios to identify the source of carbon dioxide. However, in animals and plants with rich sources of carbon dioxide, it is obvious that a C of carbon dioxide 13 / C 12 The comparison of the isotope ratios of the carbon dioxide is too simple to express the source of carbon dioxide in detail. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a simple and easy chromatography-mass spectrometry method for analyzing the stable isotope ratio of carbon di...

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Application Information

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IPC IPC(8): G01N30/88
Inventor 潘旭
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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