A dielectric barrier discharge mass spectrometry ionization source device with selective detection reagent added

Abstract

The invention relates to a DBD mass-spectrum ionization source device added with a selective detection reagent. The ionization source device comprises a T-shaped glass tube, a central ground electrode, a radiofrequency high-voltage electrode and a front ground electrode, wherein the rear port of the T-shaped glass tube is used as a discharge gas inlet, the middle port of the T-shaped glass tube is used as a selective detection reagent inlet, and the front port of the T-shaped glass tube is used as an outlet for plasma formed by discharge. During work of the ionization device, two discharge areas are respectively formed between the radiofrequency high-voltage electrode and the central ground electrode as well as between the radiofrequency high-voltage electrode and the front ground electrode, so that more heat can be generated and used for thermal analysis on samples, and the ionization efficiency is improved. When the selective detection reagent gas is input through the middle port of the T-shaped glass tube, the reagent gas can selectively react with a certain substance to form new ions so that the certain substance is distinguished from other substances, thereby improving the detection selectivity, being helpful for qualitative analysis on the samples, avoiding the central ground electrode from corrosion, and prolonging the service life of the electrodes.

Description

technical field [0001] The invention relates to an ionization source, in particular to a dielectric barrier discharge mass spectrometry ionization source device added with selective detection reagents. When the ionization source device works, two discharge regions can be formed to generate more heat for sample thermal analysis and improve ionization efficiency. When the selective detection reagent gas is introduced into the middle port of the T-shaped glass tube, the reagent gas can selectively react with the sample to form new ions, which improves the detection selectivity, is beneficial to the qualitative analysis of the sample, and will not corrode the center. electrode, prolong the service life of the electrode. Background technique [0002] Dielectric barrier discharge is a non-equilibrium gas discharge in which an insulating medium is inserted into the discharge space. Dielectric barrier discharge can work in high pressure and wide frequency range, the working pressu...

AI Technical Summary

Problems solved by technology

However, when the dielectric barrier discharge of the traditional coaxial cylindrical electrode structure uses this method to improve the qualitative ability, it is necessary to mix the selective detection reagent gas with the discharge gas in advance, and pass through the discharge area together.

Due to the addition of reagent gas, it will have a certain impact on the discharge, and when the reagent gas is corrosive, it will also corrode the central electrode and shorten the service life of the electrode

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