A quadrupole mass spectrometry sampling system for hydrogen isotope gas analysis

Abstract

The invention discloses a quadrupole mass spectrometer sampling system for hydrogen isotope gas analysis, which includes a quadrupole mass spectrometer and a sampling system connected with the quadrupole mass spectrometer and used for introducing an ion source. The sampling system includes a quadrupole mass spectrometer along The gas flow direction is sequentially connected to the first air inlet, the first shut-off valve, the second shut-off valve, the fifth shut-off valve, the first buffer bottle, the sixth shut-off valve and the quadrupole mass spectrometer. The first injection valve is equipped with a corresponding inert gas cleaning system and a step-down pressure reduction system. In the present invention, the high-pressure sample is fed through the first air inlet, and the gas source is intercepted through the pipeline between the first stop valve and the second stop valve, and then the ion source is introduced after decompression through the first buffer bottle, which can realize the The precise regulation of sample pressure improves the accuracy of isotope analysis.

Description

technical field [0001] The invention relates to the technical field of isotope gas analysis, in particular to a quadrupole mass spectrometry sampling system for hydrogen isotope gas analysis. Background technique [0002] A mass spectrometer, also known as a mass spectrometer, is an instrument for the separation and detection of different isotopes. That is, according to the principle that charged particles can be deflected in the electromagnetic field, a type of instrument is used to separate and detect the composition of substances according to the mass difference of atoms, molecules or molecular fragments. In order to realize the test of mass spectrometer, the mass spectrometer needs to be equipped with corresponding sample injection system. [0003] Most of the existing quadrupole mass spectrometry sampling systems for hydrogen isotope analysis are a single pipeline connected to the injection valve. The pipeline is connected to a pressure sensor, a vacuum gauge and a vac...

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Problems solved by technology

However, due to the different diffusion rates of different hydrogen isotope gas molecules through the same leak hole, during the continuous measurement of hydrogen isotope gas conditions, the proportion of sample components will change over time, so it is necessary to use the diffusion law for data correction. Increased the difficulty of analysis and reduced the accuracy and precision of monitoring data

[0005] Second, the sample gas consumption is large, and it is difficult to accurately control the injection pressure. The traditional sampling system must change the injection pressure by opening and closing the connected vacuum pump valve. If the valve is too late and the pressure drop is excessive, the sample gas consumption will be large, and it is difficult to accurately control the injection pressure

[0006] Third, there is no inert gas to assist in cleaning the pipeline, hydrogen isotope gas, especially H 2 , due to its light weight, it is difficult to be completely pumped away by the molecular pump. If the heavy mass inert gas (such as N 2 , Ar) mixed with hydrogen isotope gas to increase the pumping speed, hydrogen isotope gas is easy to stay in the pipeline, causing high background interference and affecting the accuracy of analysis

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