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Microwave plasma generator and proton transfer mass spectrometer

A microwave plasma and proton transfer technology, which is applied in the field of proton transfer ionization mass spectrometry, can solve the problems of the existence of radioactive substances, the complex mass spectrum, and the difficulty of analysis, and achieves low working power, low heat dissipation requirements, and enhanced sensitivity. Effect

Active Publication Date: 2011-06-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the involvement of chromatography and electron bombardment ionization, they also have defects: sample collection, concentration extraction and separation make the measurement laborious and time-consuming; electron bombardment ionization will form a variety of ion fragments, making mass spectrograms complex and difficult to analyze. High difficulty
Although the radioactive ion source is a non-polar discharge source with high ionization efficiency and can cause multiple ionizations, the ion flow is stable for a long time and the pollution is small, but the equipment of this discharge source must work at a higher voltage and the use of radioactive substances exists. Security risks

Method used

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  • Microwave plasma generator and proton transfer mass spectrometer
  • Microwave plasma generator and proton transfer mass spectrometer
  • Microwave plasma generator and proton transfer mass spectrometer

Examples

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Embodiment 1

[0032] In this embodiment, the structure of the microwave plasma generator used for the proton transfer ionization mass spectrometer is as follows figure 1 , figure 2 , image 3 As shown, it includes a microwave generator 21, a microwave cavity 23 made of stainless steel, an end cover 22, a tuning rod 24 and a microwave coupling adjustment assembly, and a circular discharge tube 26 made of ceramics; the microwave cavity 23 is a thin-walled cylinder, and the upper end Two semicircular grooves 231 are symmetrically arranged on the cavity wall, and two semicircular grooves 221 are symmetrically arranged on the cover wall at the lower end of the end cover 22. The connection mode between the end cover 22 and the microwave cavity 23 is clamping, After the end cover 22 is installed on the upper end of the microwave cavity 23, the four grooves are combined into two circular holes matching the outer diameter of the circular discharge tube, and the discharge tube 26 is fixed through t...

Embodiment 2

[0034] In this embodiment, the overall structure of the proton transfer ionization mass spectrometer based on the microwave plasma source is as follows Figure 4 As shown, it includes a steam supply system 1 for providing water vapor, making water vapor generate H 3 o + Ion microwave plasma generator 2, for analyte molecules and H 3 o + The drift tube 5 for ion proton transfer reaction, the mass spectrometer 7 for analysis and detection, and the vacuum control system 8, the steam delivery tube of the steam supply system 1 is connected to the discharge tube of the plasma generator 2, and the discharge tube of the plasma generator 2 The tube is connected to a drift tube 5 through a first joint 3 , and the drift tube 5 is provided with a sample inlet 4 and connected to a mass spectrometer 7 through a second joint 6 .

[0035] The structure of each part that forms the described proton transfer ionization mass spectrometer is as follows Figure 5 As shown, the following will be...

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Abstract

The invention provides a microwave plasma generator for a proton transfer mass spectrometer, comprising a microwave generator, and a microwave cavity, an end cover, a tuning rod and a microwave coupling adjustment module which are made of metal materials, as well as a discharge tube made of an insulating material. The invention also provides a microwave plasma source-based mass transfer ionization mass spectrometer which comprises a steam supply system for providing water vapor, a microwave plasma generator leading the water vapor to generate H3O<+> ions, a drift tube for a proton transfer reaction of analyte molecules and H3O<+> ions, a mass spectrometer for analysis and detection, and a vacuum regulation system, wherein the steam conveying pipe of the steam supply system is connected with the discharge pipe of the plasma generator; the discharge pipe of the microwave plasma generator is connected with the drift tube through a first joint; and a sample inlet formed on the drift tube is connected with the mass spectrometer through a second joint.

Description

technical field [0001] The invention belongs to the field of proton transfer ionization mass spectrometry analysis, in particular to a microwave plasma generator and a proton transfer ionization mass spectrometer using microwave plasma as an ionization source. Background technique [0002] Volatile organic compounds (VOCs for short) are the main pollutants in the atmosphere, water and soil environment. Long-term intake of VOCs may cause cancer, teratogenicity, and mutagenicity. In addition, VOCs in the air will also participate in photochemical reactions, leading to severe changes in the climate, such as acid rain, photochemical smog, organic aerosols, and the emergence of the greenhouse effect. Therefore, the highly sensitive detection of trace VOCs in the atmosphere, water and soil has always been a subject of special concern. Food also contains a lot of VOCs. By analyzing the volatiles of food, we can know the composition and quality of food. VOCs are also important com...

Claims

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Application Information

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IPC IPC(8): H01J49/10G01N27/64
Inventor 段忆翔詹雪芳
Owner SICHUAN UNIV
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