Chemical ioning method based on dielectric blocking discharge and mass ion source

A technology of dielectric barrier discharge and chemical ion, which is applied in the field of mass spectrometry ion source

Inactive Publication Date: 2006-11-15
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on its use in mass spectrometry ionization. The use of thi

Method used

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  • Chemical ioning method based on dielectric blocking discharge and mass ion source
  • Chemical ioning method based on dielectric blocking discharge and mass ion source
  • Chemical ioning method based on dielectric blocking discharge and mass ion source

Examples

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Effect test

Embodiment 1

[0021] Implementation example 1. Select water vapor as the reaction gas, and pass it into the discharge chamber. The discharge chamber adopts a cylindrical structure, double-layer dielectric, the discharge channel (3) is 2 mm in height, and the discharge area length is 10 cm. The barrier medium (2) is Quartz (0.5mm) produces a stable discharge under the discharge voltage of 3000V and frequency of 20kHz. The water vapor flow rate is 10ml / min. The outlet current of the discharge chamber that can be measured with a nanoampere meter is: 10nA, indicating that a certain amount of discharge has been obtained. H 3 o + , introduce the air sample containing volatile organic compounds to be tested into the reaction chamber. H produced by discharge 3 o + That is, it undergoes a proton transfer reaction with volatile organic compounds in the air to ionize them, so as to achieve detection by mass spectrometry. The ion source has high sensitivity (ppbv level), wide linear range (more tha...

Embodiment 2

[0022] Implementation example two, select ammonia gas as the reaction gas, and pass it into the discharge chamber, the discharge chamber adopts a flat structure, double-layer dielectric, the discharge channel (3) is 0.5mm in height, and the discharge area length is 3cm, and glass is the barrier medium (2 ) (5mm), the discharge voltage is 220V, a stable discharge is produced under the condition of a frequency of 50MHz, and the ammonia flow rate is 300ml / min, and hexachlorobenzene is introduced into the reaction chamber. NH produced by discharge 4 + That is, ion-molecule reaction with hexachlorobenzene to ionize it, so as to realize detection by mass spectrometry.

Embodiment 3

[0023] Implementation example three, select methane gas as the reaction gas, and pass it into the discharge chamber, the discharge chamber adopts a flat plate structure, double-layer dielectric, the discharge channel (3) is 10mm in height, and the discharge area length is 20cm, and alumina ceramics is the barrier medium ( 2) (1mm), the discharge voltage is 10000V, a stable discharge is generated under the condition of frequency 50Hz, the flow rate of methane is 1000ml / min, and porphyrin is introduced into the reaction chamber. The ions generated by the discharge will react with the porphyrin molecules to ionize them, so that they can be detected by mass spectrometry.

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Abstract

This invention relates to chemical ionization base on medium resisting discharging and mass spectrum ion source, it belongs to chemical engineering technique field. It especially relates to active base group ionization to organic matter molecular based on medium resisting discharging technique and mass spectrum ion source used for organic matter detecting. The features are that the medium resisting discharging device is used to ionize the reaction gas that can be used to chemical ionization, the reaction gas is ionized to generate ion and the reaction ion is ion-molecular react with the measuring organic matter to make the organic matter ionization, so mass spectrum can be used t realize detecting. The discharging voltage is 220V-10000V, frequency is 50 Hz to 50MHz, and reaction gas flow velocity is 10ml/min-1000ml/min. The corresponding mass spectrum is also provided. The measuring organic matter can be ionized in this invention, and it can be realized in atmospheric pressure environment, the device volume is small, energy consumption is low.

Description

Technical field: [0001] The chemical ionization method and mass spectrometry ion source based on dielectric barrier discharge belong to the field of chemical and chemical technology, and especially relate to the mass spectrometry ion source technology based on the ionization of organic molecules by the active groups generated by dielectric barrier discharge, and then the detection of organic matter. Background technique: [0002] At present, the common mass spectrometric ionization methods mainly include: electron ionization source (EI), chemical ionization source (CI), fast atom bombardment source (FAB), electrospray ionization source (ESI), atmospheric pressure chemical ionization source (APCI), laser Parse source (LD), etc. Among them, electron ionization source and chemical ionization source are mainly used for ionization of volatile organic samples. The electron ionization source relies on electron bombardment to ionize the sample, the structure is simple and easy to i...

Claims

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Application Information

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IPC IPC(8): H01J49/12H01J49/10H01J49/26
Inventor 张新荣朱振利薛俊海
Owner TSINGHUA UNIV
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