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Surface desorption sampling method and device

A desorption, object surface technology, applied in the field of surface desorption sampling, can solve the problem of complex sampling process and so on

Inactive Publication Date: 2011-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional heating desorption sampling process is complex and belongs to offline sampling

Method used

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  • Surface desorption sampling method and device
  • Surface desorption sampling method and device
  • Surface desorption sampling method and device

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Embodiment Construction

[0018] see figure 1 shown. The sampling device mainly consists of a high-voltage AC power supply, a high-voltage metal electrode, an insulating medium, a metal ground electrode with holes, an insulating cavity, a high-voltage wire, a ground wire, and an insulating safety helmet. in:

[0019] The cylindrical insulating cavity 5 is provided with an annular boss coaxial with the cylindrical body on the surface of the inner wall of the insulating cavity 5, and a discharge discharge port communicating with the outside of the insulating cavity 5 is provided on the side wall of the annular boss. The gas inlet 9, and the top of the ring-shaped boss are successively provided with a flat insulating medium 3, a flat high-voltage metal electrode 2, and an insulating safety cap 8. The metal electrode 2 is electrically connected to the high-voltage AC power supply 1 through a high-voltage wire 6;

[0020] A metal ground electrode 4 with a hole is arranged under the annular boss, the meta...

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Abstract

The invention relates to a surface desorption sampling method and a surface desorption sampling device by using plasma produced by dielectric barrier discharge. The device comprises an alternating-current high-voltage power supply, a high-voltage electrode, a ground electrode, an insulating medium, a discharge gas inlet and outlet, a cavity and the like. Certain alternating voltage is applied between the high-voltage electrode and the ground electrode, discharge gas is broken down to produce a large number of high-energy high-concentration electrons, ions and other species, the high-energy species pass through small holes on the ground electrode under the accelerating action of an electric field and bombard the surface of an object, and sample molecules to be detected such as explosive substances, poisonous substances and the like adsorbed on the surface of the object are desorbed from the surface of the object and enter analytical instruments of a mass spectrum, a mobility spectrum and the like through a gas carrier tape so as to be detected. By the method, in-situ on-line sampling can be realized, sampling efficiency is improved, and sampling time is shortened.

Description

technical field [0001] The present invention is based on the surface desorption sampling method and device of high-energy species in dielectric barrier discharge plasma, and particularly relates to the desorption sampling of the sample to be tested that is adsorbed by the high-energy species bombarding the surface of an object, and the sample to be tested after desorption sampling enters the mass spectrometer, ion migration Spectrum, chromatography and other analysis for analysis and detection. Background technique [0002] The study of sampling technology has always been a very important research topic for analytical instruments. For gas samples, volatile or semi-volatile samples, direct sampling methods such as purging and pumping are usually used to make the samples directly enter mass spectrometry, ion mobility spectrometry, chromatography and other analytical instruments for detection; The sampling method allows the sample in the liquid to enter the analytical instrume...

Claims

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Application Information

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IPC IPC(8): G01N1/02
Inventor 李海洋王卫国仓怀文韩丰磊陈创鞠帮玉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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