Film sampling proton transfer reaction mass spectrometry

A technology of proton transfer reaction and membrane injection, which is applied in the direction of ion source/gun, parts of particle separator tubes, etc., to achieve the effect of lowering the detection limit

Pending Publication Date: 2018-08-28
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Ordinary PTR-MS instrument mainly detects gas samples, but for liquid or solid

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  • Film sampling proton transfer reaction mass spectrometry
  • Film sampling proton transfer reaction mass spectrometry

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Specific embodiment:

[0033] Such as figure 1 As shown, it includes a hollow cathode ion source 2, a drift tube 5, an ion transmission area 7, a mass analyzer 8 and a membrane sampling system 9.

[0034] The hollow cathode ion source 2 has a water vapor inlet 1 at the front end and a water vapor outlet 3 at the back end. The present invention only takes the most commonly used hollow cathode ion source as an example, and there are other forms of ion sources, such as electron bombardment ionization sources, plane electrode DC discharge sources, radioactive ionization sources, light-induced ion sources and microwave plasma sources. In addition to using H produced by water 3 O + In addition to the parent ion, NH can also be used 4 + , NO + , O 2 + Wait.

[0035] The drift tube 5 has an inlet 4 for the object to be tested at the front end, and an exhaust port 6 at the rear end. The drift tube 5 is composed of metal ring electrodes separated by insulating rings, and resistors of the sam...

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Abstract

The invention discloses a film sampling proton transfer reaction mass spectrometry. The film sampling proton transfer reaction mass spectrometry comprises an ion source, a drift tube, an ion transmission region and a mass analyzer which are sequentially connected, wherein a steam inlet is arranged in a front end of the ion source, a steam outlet is arranged in a rear end of the ion source, an object to be tested inlet is arranged in a front end of the drift tube, an extraction hole is formed in a rear end, the object to be tested inlet is connected with a film sampling system, a sample inlet is arranged in a front end of the film sampling system, a mechanical pump is connected to a rear end, a PDMS film is arranged at a middle part, and a rear cavity of the PDMS film is connected with theobject to be tested inlet. By employing the film sampling system combined with the proton transfer reaction spectrometry, a gas/liquid sample can be directly introduced, a solid sample can be introduced after being thermally decomposed, and the detection reliability of a gas, liquid or solid constituent is improved; the trace quantity VOCs in the sample is detected after being enriched by a silicone rubber film, the detection limit of an instrument is further reduced, and a volatile organic matter in gas, liquid or solid can be detected.

Description

technical field [0001] The invention relates to a proton transfer reaction mass spectrometer in the field of analytical instruments, in particular to a membrane-injected proton transfer reaction mass spectrometer. Background technique [0002] Proton Transfer Reaction Mass Spectrometry (PTR-MS) is an online detection technique for trace volatile organic compounds. PTR-MS usually adopts H 3 o + As the initial reactant ion, the quasi-molecular ion MH is generated through the proton transfer reaction with the organic molecule M + , and use mass spectrometry to detect the intensity of product ions to quantitatively determine the absolute concentration of organic matter M. Water vapor passes through the ionization source area and is discharged to generate H 3 o + , and then enter the drift tube, and collide with the analyte M in the process of drift diffusion in the drift tube, H 3 o + The proton is transferred to the analyte M to ionize it. The reaction formula is: [0...

Claims

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Application Information

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IPC IPC(8): H01J49/10
CPCH01J49/10
Inventor 孙瑞瑞陈军黄培余业鹏李照辉林烜盛六四
Owner UNIV OF SCI & TECH OF CHINA
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