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GC-IRMS direct measurement method for hydrogen sulfide sulfur isotope in mixed gas

A technology of sulfur isotope and mixed gas, which is applied in the field of geochemical analysis, test and experiment to achieve the effect of less gas consumption, reduced error and good repeatability

Inactive Publication Date: 2011-01-05
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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Problems solved by technology

Currently, the natural gas H 2 There are few research literatures on sulfur isotope analysis methods in S, and the sulfur isotope testing technology adopted can only convert sulfur-containing substances in solid form into SO 2 or SF 6 , and then use the isotope mass spectrometer to determine the sulfur isotope

Method used

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Embodiment Construction

[0027] The GC-IRMS direct determination method of hydrogen sulfide sulfur isotope in mixed gas comprises the following steps:

[0028] (1) Start the gas chromatography-stable isotope ratio mass spectrometer with Isodat NT 2.0 software.

[0029] Among them: the experimental instrument is DeltaPlusXP gas chromatography-stable isotope ratio mass spectrometer, including Agilent 6890A gas chromatograph, interface part (GC-CIII interface) and DeltaPlusXP mass spectrometer host, and the workstation software is Isodat NT 2.0. The present invention can also be used with other instruments and configurations having similar performance.

[0030] The chromatographic column is HP-PLOT Q 32m×0.32mm×20μm, the carrier gas is He (99.999%), the high voltage of the mass spectrometer is 3.0kV, the emission current is 1.5mA, and the electron energy is 131eV.

[0031] The start-up steps are the same as other isotope analysis, that is, turn on the vacuum system of the main engine, turn on the carrie...

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Abstract

The invention relates to a GC-IRMS direct measurement method for hydrogen sulfide sulfur isotope in mixed gas, which comprises the steps of: firstly, by utilizing a gas chromatogram-stable isotope ratio mass spectrum combined instrument with I s o d a t N T 2.0 software, carrying out the magnetic field control so that an intermediate receiving cup receives ions with the receiving charge-to-mass ratio of 35, which are 35H2S, and correspondingly, receiving cups on two sides respectively receive ions with charge-to-mass ratios of 34 and 36, which are 34H2S and 36H2S, and recording a numerical value of a magnetic filed at the moment; then correcting the instrument by H2S reference gas; secondly, injecting a plurality of gas samples containing 1-5ml H2S into a gas chromatograph in the instrument, and meanwhile obtaining gas chromatograms of 36H2S, 35H2S and 34H2S and gas chromatograms of ratios of 36H2S / 34H2S and 35H2S / 34H2S; finally, processing obtained data to gain a value of hydrogen sulfide sulfur isotope in a mixed gas sample. The GC-IRMS direct measurement method has the characteristics of simpleness, rapidness, accuracy and small sample consumption, and does not need sample preparation and correction of interference isotopes.

Description

technical field [0001] The invention relates to the technical field of geochemical analysis, testing and experiments, in particular to a GC-IRMS direct determination method for hydrogen sulfide sulfur isotopes in mixed gases. Background technique [0002] With the continuous discovery of high-sulfur natural gas reservoirs, the use of sulfur isotopes to study the formation mechanism of high-sulfur natural gas has gradually attracted widespread attention from domestic scholars. Currently, the natural gas H 2 There are few research literatures on sulfur isotope analysis methods in S, and the sulfur isotope testing technology adopted can only convert sulfur-containing substances in solid form into SO 2 or SF 6 , and then use the isotope mass spectrometer to determine its sulfur isotope. The sulfur isotope analysis method of hydrogen sulfide in natural gas generally adopts chemical methods to convert H in natural gas on site. 2 S is converted into sulfide, and then the sulfid...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 李立武李中平杜丽曹春辉
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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