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High-selectivity ion mobility spectrometry capable of being used for online monitoring benzene series in soil

An ion mobility spectrometry, high-selectivity technology, used in ion sources/guns, measuring devices, particle separation tubes, etc., can solve the problems of short service life, need to be replaced frequently, and reduce ionization efficiency, to improve the sensitivity of the instrument, The effect of avoiding temperature exchange and accelerating penetration

Pending Publication Date: 2021-03-16
NORTHWEST UNIV(CN)
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Problems solved by technology

For the detection of benzene series in soil, the use of ultraviolet light as the ion source can eliminate the interference of some impurity gases (molecules with higher ionization energy than the electron energy of ultraviolet light), but if the gas to be measured is directly passed into the ion mobility spectrometer, Impurity gases have a serious impact on the measurement results, such as water molecules in the air, and humid air will reduce ionization efficiency and thus affect sensitivity and resolution
If the membrane is used to directly filter impurities and inject samples, disadvantage 1: the specific surface area is not very large, and the removal effect of impurities is not good. Disadvantages
2: Short service life, need to be replaced frequently, not suitable for online monitoring
The selectivity of such ion mobility spectra is not high, and the resolution of the obtained spectra is not high.

Method used

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  • High-selectivity ion mobility spectrometry capable of being used for online monitoring benzene series in soil
  • High-selectivity ion mobility spectrometry capable of being used for online monitoring benzene series in soil
  • High-selectivity ion mobility spectrometry capable of being used for online monitoring benzene series in soil

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Embodiment Construction

[0031] The present invention will be further described below in combination with specific embodiments.

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 and 2 It is a top view and a cross-sectional view of the structure of the ion mobility spectrometer ion source of the three-ultraviolet lamp in this embodiment, and the injection port 1 in the ion source area is as figure 1 As shown, the injection holes at the injection port are a number of scattered holes that are not concentrated in the center of the ion source area. These holes are used to disperse the sample gas carried by the carrier gas to prevent the gas from concentrating in one hole. The flow rate is too large, and the sample directly Carried by the gas to the ion gate. Such as figure 2, UV lamp installation position 2, the UV lam...

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Abstract

The invention discloses an ion mobility spectrometry which adopts an ultraviolet light ionization source. A multi-channel filter membrane is used so that the ion mobility spectrometry has dual selectivity, and the ion mobility spectrometry can be used for carrying out field detection or online monitoring on benzene series and polycyclic aromatic hydrocarbon in a complex matrix environment, such asbenzene series and polycyclic aromatic hydrocarbon in soil. Impurities with a high polarity are separated for the first time by using a multi-channel membrane assembly, and secondary selection is carried out by selective ionization of an ultraviolet lamp so that an instrument has dual selectivity. The multi-channel membrane assembly is placed in a self-designed internal circulation closed heat preservation cavity, permeation of a target compound is accelerated, and the separation efficiency of the multi-channel membrane assembly is improved. The ion mobility spectrometry adopts a design thatthree ultraviolet lamps are circumferentially and uniformly distributed so that the ionization efficiency of the ion source can be improved. The ion mobility spectrometry can be applied to online monitoring of the benzene series in the soil, is faster and more convenient compared with a traditional method for detecting the benzene series, and is beneficial to pollution control work of the benzeneseries in the soil.

Description

technical field [0001] The invention relates to the technical field of analytical instruments, in particular to a highly selective ion mobility spectrum for on-line detection of benzene series in soil. Background technique [0002] Benzene series are one of the main pollutants that cause soil pollution in the leakage of organic chemicals. Petroleum, chemical coking and other activities can easily bring benzene series into the environment. Benzene series that enter the environment will cause huge harm to the human body. harm. The soil is the main destination of environmental pollutants, and benzene series pollutants can easily enter the soil environment and cause pollution to it. Therefore, it is of great significance to carry out the detection and research of benzene series in soil. [0003] The technologies currently used for the detection of benzene series in soil include gas chromatography (gas chromatography, GC), liquid chromatography (liquid chromatography, LC), gas c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/622G01N27/64H01J49/04H01J49/16
CPCG01N27/622G01N27/64H01J49/0422H01J49/162
Inventor 代渐雄刘岩
Owner NORTHWEST UNIV(CN)
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