Novel chlorine/bromine isotope mass spectrometer based on normal pressure plasma ionization and analysis method thereof

Abstract

The invention provides a normal pressure plasma ion source; an inertia reaction gas tube is connected with the inlet end of a reaction ionization tube; the reaction ionization tube is wrapped by an electrode slice; an insulation sleeve sleeves on the reaction ionization tube and the electrode slice; the electrode slice is connected with an electrode wire; the electrode wire leads out from a hole of the insulation sleeve and is connected with a high pressure medium block discharge source phase; the invention also discloses a new chlorine / bromine isotope mass spectrometer comprising the ion source, and provides a chlorine / bromine isotope ratio analysis method. The method can use a plasma ionization source stably working under a normal pressure to combine a sample conversion process with an ionization process, thus greatly reducing the analysis flow; a magnetic mass analyzer and a Faraday detector satisfying ionization fragment requirements are matched and coupled to form the novel chlorine / bromine isotope mass spectrometer with a high analysis precision; the ionization source can work under a normal pressure and atmospheric pressure conditions, and can be applied to the chemical, environmental protection, geosciences and medical science fields.

Description

technical field [0001] The invention relates to an atmospheric pressure plasma ion source, a novel chlorine / bromine isotope mass spectrometer based on atmospheric pressure plasma ionization and a chlorine or bromine isotope analysis method, belonging to the field of isotope mass spectrometry analysis. Background technique [0002] With the continuous deepening of earth science, environmental science, food science and medical research, the traditional whole sample isotope ratio analysis (BSIA) can no longer meet the research needs, and the new organic monomer isotope technology (CSIA) has become a frontier research hotspot. The CSIA method can be used to identify and track groundwater, surface water and soil organic pollution sources, monitor the degradation process of organic pollutants and test the effect of prevention and control measures, identify manufacturers of chlorinated organic substances, and investigate the relevant responsibilities of organic pollution incidents. ...

AI Technical Summary

Problems solved by technology

However, since the negative chemical ionization method is a soft ionization technology, the efficiency of the ionization source is still not high, and some substances with strong molecular structure symmetry (such as hexachlorobenzene, etc.) still cannot achieve the stripping of halogen atoms while ionizing

To solve this problem, our research group has developed an isotope mass spectrometer based on radio frequency discharge ionization, but this ionization source needs to work in a vacuum, which has caused certain difficulties for equipment maintenance.

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