In-source membrane sample introduction radio frequency enhanced chemical ionization source
A technology of enhanced chemistry and membrane sampling, applied in the direction of circuits, discharge tubes, electrical components, etc., can solve the problems of insufficient ionization efficiency and unfavorable ion efficient transmission, and achieve the effect of improving instrument sensitivity, sensitivity, and efficiency
Active Publication Date: 2021-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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[0006] These methods are only applied under single photon ionization conditions, the ionization efficiency is not high enough, and the sample molecules cannot directly enter the electric field formed by the internal electrodes after permeating out of the membrane, which is not conducive to the efficient transmission of ions
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Embodiment Construction
[0017] In order to improve the sensitivity of membrane sampling, the invention provides a radio frequency enhanced chemical ionization source for membrane sampling in the source.
[0018] Such as figure 1 Shown: the present invention is applied to a mass spectrometry instrument, wherein 1 is a vacuum ultraviolet light source, 2 is a repelling electrode, 3 is a focusing electrode, 4 is a transmission electrode, 5 is a differential electrode, 6 is an insulating column, and 9 and 11 are metal capillaries , 8 and 17 are silica gel electric heating belts, 16 is insulation cotton, and 13 is a reagent gas sampling capillary. The light emitted by the vacuum ultraviolet light source 1 is injected into the ionization chamber 15, and the ionization area of the mass spectrometry ionization source is formed at the lower end of the vacuum ultraviolet light source 1. The tubular membrane 7 is directly placed in the ionization area of the mass spectrometry ionization source, and the two e...
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The invention relates to a mass spectrometry instrument, in particular to an in-source membrane sample introduction radio frequency enhanced chemical ionization source. The chemical ionization source specifically structurally comprises an ionization source cavity, a vacuum ultraviolet lamp, a gas sample introduction tube, a tubular membrane, a silica gel electric heating tape, a liquid sample introduction tube, a repulsion electrode, a radio frequency electrode and a differential electrode. The ionization source can work in three modes: a single photon ionization mode, a chemical ionization mode and a radio frequency enhancement mode. High-sensitivity analysis of the volatile organic compounds in the water is achieved through ionization in the ionization source, and the permeability of the volatile organic compounds in the water passing through the tubular membrane is improved through heating of the liquid sample feeding pipe and the ionization source. Reagent gas can be introduced in a chemical ionization mode, ionization is carried out firstly under ultraviolet irradiation, sample molecules permeating out of the membrane and reagent ions are subjected to charge transfer or proton transfer reaction, and the ionization efficiency is greatly improved. The introduction of the radio frequency electric field can improve the collision frequency of ion molecules and improve the yield of the ion molecule reaction, thereby improving the sensitivity.
Description
technical field [0001] The invention belongs to a mass spectrometry analysis instrument, in particular to a source inner membrane sampling radio frequency enhanced chemical ionization source. The ionization source can realize rapid enrichment and analysis of volatile organic pollutants in liquid samples. The sample in the tubular membrane is ionized by the ionization source after rapid permeation under the action of the concentration difference and pressure difference between the inside and outside of the membrane. The ionization source can work in three modes: single photon ionization mode, chemical ionization mode, radio frequency enhanced mode. The chemical ionization mode can introduce reagent gas. The reagent gas is first ionized under ultraviolet light irradiation, and the sample molecules permeated from the membrane then undergo charge transfer or proton transfer reaction with the reagent ions, which greatly improves the ionization efficiency. The introduction of radi...
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IPC IPC(8): H01J49/14H01J49/04
CPCH01J49/0404H01J49/0422H01J49/0431H01J49/145
Inventor 侯可勇吴称心谢园园于艺李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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