Gas sample introduction device and application thereof

A sampling device, gas sampling technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that are not conducive to the automation of automatic sampler, increase the number of analysis of a single sample, consume analysis time, etc., to achieve convenient isotope analysis work, avoid multiple injections, simple operation
CN104634901AActive Publication Date: 2015-05-20CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2015-05-20

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Abstract

The invention relates to a gas sample introduction device. The gas sample introduction device can perform two or more different volume sample introduction successively, has the characteristics of accurate quantification, simple operation, continuous operation, no dead volume, convenient connection with detection system, and matching use with an automatic sample injector, and realizes automated analysis of batch gas samples. By applying the variable volume sample introduction technology provided by the invention to analysis of carbon-hydrogen isotopes in natural gas, the requirements for determining the isotope ratio of different concentration component (carbon dioxide, methane, ethane, propane, isobutane, n-butane) of hydrogen and carbon can be satisfied, the signal response of all stratographic components in an isotope mass spectrometer is within a dynamic varying range and is close to working standard signal intensity as far as possible, thereby avoiding multiple injection of isotope analysis, facilitating laboratory isotope analysis work, and improving the work efficiency of sample test.
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Description

technical field

[0001] The invention belongs to the technical field of hydrocarbon isotope analysis, and relates to a gas sampling device and its application in hydrocarbon isotope analysis in natural gas. Background technique

[0002] The hydrocarbon isotopes of various compounds in natural gas samples are important geochemical tracers. However, the relative concentrations of gas components (carbon dioxide, methane, ethane, propane, isobutane, n-butane) in the samples are quite different, especially in the currently explored natural gas fields, which are highly evolved and mainly composed of methane. Objectively, the determination of hydrogen and carbon isotope ratio requires that the signal response of each separated component in the isotope mass spectrometer must meet its dynamic range and be as close as possible to the working standard signal intensity. For this purpose analysts use small volume injections (5 μL) for methane and large volume injections (500 μL) for etha...

Claims

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