Normal-pressure micro-glow discharge desorption mass spectrum ion source and mass spectrometry device composed of ion source

A technique of glow discharge and mass spectrometry, which is applied in the direction of measuring devices, plasma, and analytical materials. It can solve the problems of high-energy sources and the complexity of mass spectrograms, and achieve the effects of easy-to-obtain materials, convenient manufacture, and easy disassembly and assembly.

Inactive Publication Date: 2014-07-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies have played an important role in various fields, but due to defects such as the need for high energy sources and high heat complicating mass spectrograms, further improvement and improvement are needed

Method used

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  • Normal-pressure micro-glow discharge desorption mass spectrum ion source and mass spectrometry device composed of ion source
  • Normal-pressure micro-glow discharge desorption mass spectrum ion source and mass spectrometry device composed of ion source
  • Normal-pressure micro-glow discharge desorption mass spectrum ion source and mass spectrometry device composed of ion source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The structure of the desorption mass spectrometry ion source based on atmospheric pressure microglow discharge in this embodiment is as follows: Picture 1-1 , attached Figure 1-2 And attached Figure 1-3 As shown, the composition mainly includes a micro-plasma generation chamber processed on the base member 1, and a pair of platinum sheet-shaped electrodes embedded face-to-face on the upper and lower walls of the micro-plasma generation chamber for breakdown of the working gas to generate discharge. 2, and fixed on the inlet end of the micro-plasma generation chamber for connecting the gas path conversion joint 3 of the working gas introduction system, the base part is ceramics with a purity of not less than 96% of aluminum oxide, and the electrode 2 can be connected with The positive and negative poles of the DC stabilized power supply adjusted between 80 and 3000V are connected to form a circuit, and the two platinum electrodes are set at a distance of about 1 mm f...

Embodiment 2

[0049] The atmospheric pressure microglow discharge desorption mass spectrometry device of this embodiment mainly includes a working gas introduction system, the atmospheric pressure microglow discharge desorption mass spectrometry ion source described in Example 1, and a direct current whose voltage can be adjusted in the range of 80 to 3000V. Power supply, mass spectrometer and mass spectrometry data processing system. The normal-pressure microglow discharge desorption mass spectrometry ion source is clamped and fixed on a vertical rotating platform that can rotate within the range of 0-90° in the vertical direction, and the vertical rotating platform is arranged on a 3-dimensional (3D) translation platform. The working gas introduction system is a helium or argon cylinder equipped with a mass flow meter to ensure that the flow rate of helium or argon as a working gas in the micro-plasma generation chamber is controlled within the range of 0.5-2.5 L / min. The normal-pressure ...

Embodiment 3

[0051] The solid and liquid samples were analyzed using the atmospheric pressure microglow discharge desorption mass spectrometry device described in Example 2. Place the solid (or liquid) sample 10 on the carrier 11 between the plasma outlet of the ion source and the plasma gas inlet 8 of the mass spectrometer, so that the plasma gas ejected from the outlet of the ion source is aimed at the sample to be tested , so that the molecules on the surface of the sample are desorbed and ionized under the action of the plasma gas. The carrier of block, paste and liquid samples can be ordinary glass slides, filter paper, ceramic sheets, stainless steel sheets, etc. Liquid samples can also be placed directly in the container, and powder samples need to be fixed on the above-mentioned container with double-sided adhesive tape. Carrier and then detected to prevent the powder sample from entering the mass spectrometer with the airflow and blocking the inlet of the mass spectrometer. The h...

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Abstract

The invention discloses a normal-pressure micro-glow discharge desorption mass spectrum ion source and a mass spectrometry device composed of the ion source. The ion source mainly comprises a micro-plasma generation cavity formed in an insulating material base part, a pair of breakdown electrodes fixedly arranged on the wall face of the micro-plasma generation cavity, and a gas path conversion connector fixedly arranged at the inlet end of the micro-plasma generation cavity and used for being connected with a working gas introduction system, wherein the electrodes are connected with an adjustable direct-current and stable-voltage power supply. The mass spectrometry device mainly consists of the working gas introduction system, the normal-pressure micro-glow discharge desorption mass spectrum ion source, the adjustable direct-current and stable-voltage power supply, a mass spectrometer and a mass spectrum data processing system. The mass spectrometry device is used for carrying out spectral analysis on a sample and has the very prominent advantages in multiple aspects of small needed power, less needed gas amount, no need of toxic reagents, low plasma gas temperature, no pollution to the environment, simplicity and convenience for operation, no need of pre-treating the sample, high detection sensitivity, capability of realizing high-flux online detection and the like.

Description

technical field [0001] The invention belongs to the technical field of atmospheric pressure mass spectrometry ionization, and in particular relates to an atmospheric pressure desorption mass spectrometry ion source based on atmospheric pressure microglow discharge and a mass spectrometry analysis device composed of the same. Background technique [0002] Mass spectrometry is a method of mass spectrometry by measuring the mass-to-charge ratio of the measured sample ions. As an important detection tool in analytical science, mass spectrometer has the advantages of high sensitivity, fast analysis speed, good selectivity, and can be used in chemometrics. It is widely used in chemistry, chemical industry, materials, environment, geology, energy, medicine, Criminal investigation, life science, sports medicine and other fields, and it plays a huge role in the qualitative and quantitative analysis of trace analytes. The structure of a mass spectrometer mainly includes an ion source...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/72H05H1/34H05H1/32
Inventor 段忆翔丁薛璐王博
Owner SICHUAN UNIV
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