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Mass spectrum ionization source

An ionization source and mass spectrometry technology, applied in the field of mass spectrometry ion sources, can solve problems such as complex instrument design, limited detection range, and single ionization source, and achieve the effects of easy production and processing, increased sample volume, and expanded application range

Active Publication Date: 2014-09-24
GUANGZHOU HEXIN INSTR CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The glow discharge ion device has a simple structure and low operating costs, but requires a certain degree of vacuum, which makes the design of the instrument complicated
The dielectric barrier discharge ion source disclosed in Chinese patent 2006100115481 has a simple structure, low gas flow rate, less pollution and low cost. It can complete the direct desorption and ionization of solid samples under atmospheric pressure, but its electrodes are on both sides of the medium, and the shape of the sample , size and thickness are limited by the size of the electrode and the dielectric space
The low-temperature plasma ionization source disclosed in Chinese patent 2008102270160 has been improved on Chinese patent 2006100115481, but it is mainly suitable for solid organic matter, liquid organic matter or solutions containing liquid organic matter. The ionization source is single and its detection range is limited.

Method used

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Examples

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Embodiment 1

[0048] This embodiment provides a mass spectrometry ionization source, the structure of the mass spectrometry ionization source is as follows Figure 1-Figure 3As shown, it includes a sampling device 1 , a repeller electrode 2 and a dielectric barrier discharge device 3 . The repelling electrode 2 is located in front of the mass spectrometer port 4 of the mass spectrometer mass analyzer, the distance between the repelling electrode 2 and the mass spectrometer port 4 is 10mm, and a positive voltage of 500V is applied to the repelling electrode 2 . The repelling electrode 2 uses a metal sheet as an electrode. By applying a certain DC voltage on the repelling electrode 2, a certain voltage drop is formed between the repelling electrode 2 and the mass spectrometer port 4, and the injection volume of the charged sample is increased.

[0049] Such as figure 2 As shown, the sampling device 1 includes a sample injection tube and a three-way nozzle 11 communicated with the sample tub...

Embodiment 2

[0057] Such as Figure 4 As shown, this embodiment provides a mass spectrometry ionization source, the structure of which is basically similar to that of Example 1, which includes a sampling device 1, a repeller electrode 2 and a dielectric barrier discharge device 3, and the sampling device 1. The structures of the repelling electrode 2 and the dielectric barrier discharge device 3 are similar to those of the corresponding components in Embodiment 1, and will not be repeated here.

[0058] The difference is that: the outlet port of the dielectric chamber 31 of the dielectric barrier discharge device 3 forms an angle of 120° with the mass spectrometer port 4, and the distance between the two ports is 5mm; The outlet port of the chamber 31 forms an included angle of 150°, and the distance between the two is 10 mm. That is, the position of the insulating medium cavity 3 has changed. Similarly, the low-temperature plasma and the ejected liquid or gas sample converge countercurre...

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Abstract

The invention discloses a mass spectrum ionization source and belongs to the technical field of mass spectrum ion sources. The mass spectrum ionization source is designed in order to solve the problems that the detection range of an existing ion source ionization source is limited and ionization efficiency is low. The mass spectrum ionization source comprises a sample injection device, a repelling electrode and a dielectric barrier discharge device; liquid or gas samples enter a tee nozzle through a sample injection tube of the sample injection device, and the liquid samples with solvent removed are sprayed out from the lead-out end of the tee nozzle along with carrier gas or the gas samples are sprayed out from the lead-out end of the tee nozzle; reaction gas enters an insulation dielectric cavity through a gas guide tube of the dielectric barrier discharge device, and low-temperature plasma is generated under the action of a discharge electrode and sprayed out from the lead-out end of the insulation dielectric cavity; the low-temperature plasma and the liquid or gas samples converge on a mass spectrum opening in a backflow mode, ionized sample molecules are formed, and the molecules converge to the mass spectrum opening under the action of the repelling electrode. According to the mass spectrum ionization source, not only is the detection range of the ionization source widened, but also the ionization efficiency and the detection sensitivity of an instrument are improved.

Description

technical field [0001] The invention relates to a mass spectrometry ion source, in particular to a mass spectrometry ionization source suitable for analyzing liquid or gas samples. Background technique [0002] Mass spectrometry is one of the most sensitive and widely used analytical methods known. The mass spectrometer used in this method consists of two parts: an ion source and a mass analyzer. [0003] Among them, the ion source is the key technology for sample ionization. Electrospray ionization (ESI) is a common ionization method for atmospheric pressure mass spectrometry. Electrospray applies an electric field to generate charged droplets, which send analyte ions to the mass spectrometer for detection by ion evaporation. Ionization is done in a liquid state. This ionization technology is suitable for the ionization of biological macromolecules, but the ionization efficiency is relatively low, and the tolerance to non-volatile salts is also relatively low. For organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/10G01N27/64
Inventor 程平刘吉星朱辉董俊国周振
Owner GUANGZHOU HEXIN INSTR CO LTD
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