CN116031138A - Gas-phase pollutant all-species high-sensitivity online mass spectrometer and detection method - Google Patents
Gas-phase pollutant all-species high-sensitivity online mass spectrometer and detection method Download PDFInfo
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Abstract
The invention discloses a gas-phase pollutant all-species high-sensitivity online mass spectrometer and a detection method, and relates to the technical field of mass spectrometry technology development. The mass spectrometer comprises a high-energy photoionization ion source structure, an ion transmission structure and a mass spectrum detection structure. The high-energy photoionization ion source structure comprises a high-energy photon generating structure, a sample inlet pipe and an ionization chamber, wherein the high-energy photon generating structure generates high-energy photons by utilizing neon discharge, and the high-energy photons are mixed with gas to be detected entering through the sample inlet pipe in the ionization chamber through the array type microporous channel plate and ionize the gas to be detected; the ion transmission structure is provided with radio-frequency quadrupole rods for filtering a large amount of N generated during air measurement 2 + And O 2 + Waiting for non-target background ions; the mass spectrum detection structure is provided with a pulse-compensation double-electrode ion removing device,the method is used for further removing non-target background ions and relieving measurement saturation and loss of the ion detector. The invention can realize the full-coverage high-sensitivity detection of all gas-phase organic and inorganic pollutants in the atmosphere.
Description
Technical Field
The invention relates to the technical field of mass spectrometry technology development, in particular to a high-sensitivity mass spectrometer with detection indexes covering all atmosphere organic and inorganic polluted gases and a detection method.
Background
Mass spectrometry is a method for analyzing chemical components of substances, and molecular structure information of the substances is determined through ion mass-to-charge ratio and ion abundance, and various substances can be ionized and detected by matching different ionization sources. Mass spectrometry techniques commonly used to detect gas phase materials mainly include electron ionization mass spectrometry, proton transfer reaction mass spectrometry, and single photon ionization mass spectrometry. Electron ionization usually uses electron beams with 70eV energy to bombard neutral molecules to ionize, and in theory, all organic and inorganic gases can be ionized, but the high vacuum environment suitable for the electron ionization technology leads to lower detection sensitivity of electron ionization mass spectrometry for directly detecting gas-phase species, and cannot meet the detection requirements of most low-concentration volatile organic matters in ambient air. Proton transfer reaction mass spectrometry with high detection sensitivity utilizes hydronium ions (H 3 O + ) The ionic type proton transfer reaction with the object to be detected can only protonate the substance with proton affinity greater than water, and can not detect some small molecular hydrocarbon and inorganic substances with proton affinity smaller than water. Single photon ionization is a threshold ionization in which a molecule is directly ionized by absorbing a single photon when the photon energy is equal to or higher than the ionization energy of the molecule. Single photon ionization mass spectrometry generally uses a vacuum ultraviolet lamp as a light source, and the principle of luminescence is: the rare gas is excited by using a direct current or radio frequency electric field to generate excited state atoms or excimer molecules, and the excited state atoms or excimer molecules radiate absorbed energy in the form of photons when spontaneously transiting to a ground state. The main luminescent medium gases are helium (58.4 nm), neon (74.4 nm), argon (106.7 nm), krypton (123.6 nm) and xenon (147.6 nm). In order to transmit vacuum ultraviolet light and maintain the pressure of rare gas in the discharge chamber, the vacuum ultraviolet lamp generally uses a magnesium fluoride window as a light outlet. Through many years of technical innovation, high-flux vacuum ultraviolet lamps and high-pressure ion sources and single light are developedThe detection sensitivity of the ionization mass spectrum is greatly improved, and the ionization mass spectrum is successfully used for on-line monitoring of volatile organic compounds in ambient air. However, since the crystal structure of the window can only transmit light above 110nm, the conventional single photon ionization source generally discharges with krypton, the photon energy generated is 10.0eV and 10.6eV, and the ionization and detection cannot be effectively performed on organic or inorganic matters with ionization energy exceeding 10.6 eV. Therefore, the existing mass spectrometry technology for directly detecting gas-phase substances cannot realize full-coverage high-sensitivity detection of organic and inorganic polluted gases in ambient air due to the limitation of ionization modes.
Disclosure of Invention
The invention aims to provide a gas-phase pollutant all-species high-sensitivity online mass spectrometer and a detection method, which are combined with a high-energy photoionization ion source structure, a radio-frequency quadrupole rod and a pulse-compensation double-electrode ion removing device to realize all-coverage high-sensitivity detection of all volatile organic pollutants in the atmosphere and inorganic pollutants such as carbon dioxide, sulfur dioxide, nitrogen oxide and the like, widen the applicable range of mass spectrometry detection and solve the problem that the existing mass spectrometry cannot achieve both the full coverage and the high-sensitivity detection of the gas-phase pollutants.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a gas-phase pollutant all-species high-sensitivity online mass spectrometer, which comprises a high-energy photoionization ion source structure, an ion transmission structure and a mass spectrum detection structure which are sequentially communicated; the high-energy photoionization ion source structure comprises a high-energy photon generation structure, a sample feeding tube and an ionization chamber, wherein neon is used as discharge gas in the high-energy photon generation structure to generate high-energy photons, and the high-energy photons are mixed with gas to be detected entering through the sample feeding tube in the ionization chamber and ionize the gas to be detected; the ion transmission structure comprises a radio-frequency quadrupole rod and an electrostatic lens, one end of the radio-frequency quadrupole rod corresponds to an outlet of the high-energy photoionization ion source structure, the other end of the radio-frequency quadrupole rod corresponds to the electrostatic lens, the radio-frequency quadrupole rod is used for filtering non-target background ions, and the electrostatic lens is used for focusing ions; the mass spectrum detection structure comprises a pulse extraction electrode, an accelerating electrode, a field-free flight area, a reflecting electrode, a pulse-compensation double-electrode ion removing device, a micro-channel plate detector and a signal acquisition system, wherein ions entering the mass spectrum detection structure are extracted by the pulse extraction electrode and enter the accelerating electrode for acceleration, the accelerating electrode is positioned at an inlet on one side of the field-free flight area, the reflecting electrode is arranged on the other side of the field-free flight area, an outlet is further arranged on one side of the field-free flight area, the pulse-compensation double-electrode ion removing device is arranged at the outlet, ions entering the field-free flight area from the inlet move in the field-free flight area, when the ions move to the reflecting electrode, the ions are reflected and reversely move under the action of the reflecting electrode, the ions leave the field-free flight area from the outlet, the pulse-compensation double-electrode ion removing device is used for further removing non-target background ions, and the micro-channel plate detector is used for receiving ions in a specified mass range controlled by the pulse-compensation double-electrode ion removing device and outputting the ions to the signal acquisition system.
Preferably, the high-energy photon generating structure comprises a discharge structure, a radio frequency coil, a neon inlet tube and a neon outlet tube, wherein the radio frequency coil is wound on the discharge structure, the discharge structure is provided with a discharge cavity, and the neon inlet tube and the neon outlet tube are communicated with the discharge cavity.
Preferably, the discharge structure is made of quartz, and the air pressure in the discharge cavity is 50-1000Pa.
Preferably, the high-energy photoionization ion source structure further comprises an array type microporous channel plate, wherein the array type microporous channel plate is arranged between the discharge cavity and the ionization chamber and is used for transmitting high-energy photons.
Preferably, the discharge cavity, the ionization chamber, the radio-frequency quadrupole rod and the electrostatic lens are coaxially arranged in sequence.
Preferably, the pulse-compensation double-electrode ion removing apparatus includes a pulse electrode and a compensation electrode, a gap is provided between the pulse electrode and the compensation electrode, the pulse electrode provides a forward electric field for passing ions in a designated pulse width time, and provides a reverse strong electric field for preventing ions from passing in the rest time, and the compensation electrode has a reverse stable voltage for inhibiting penetration of non-target background ions and secondary ions and baseline drift.
Preferably, the high-energy photoionization ion source structure, the ion transmission structure and the mass spectrum detection structure are all in vacuum environments.
The invention also provides a detection method adopting the gas-phase pollutant all-species high-sensitivity online mass spectrometer, which comprises the following steps:
step one: providing a vacuum environment for a high-energy photoionization ion source, an ion transmission structure and a mass spectrum detection structure;
step two: neon enters the discharge cavity from the neon inlet pipe, flows out from the neon outlet pipe, and maintains a certain pressure in the discharge cavity; the neon in the discharge cavity is excited by the radio frequency coil to generate high-energy photons;
step three: the high-energy photons enter an ionization chamber through the array type micro-hole channel plate, are mixed with the gas to be detected introduced by the sample injection pipe, and ionize the gas to be detected;
step four: ions generated by ionization enter an ion transmission structure from an outlet of an ionization chamber, and part of non-target background ions are filtered by a radio-frequency quadrupole rod and then focused by an electrostatic lens to enter a mass spectrum detection structure;
step five: ions entering the mass spectrum detection structure are led out by a forward electric field provided by the pulse leading-out electrode; then, under the action of the accelerating electrode, ions enter a field-free flight area, and after flying at a constant speed for a period of time, the ions are repelled by a reverse electric field provided by the reflecting electrode and move reversely;
step six: the ions reach a pulse-compensation double-electrode ion removing device to further remove the residual non-target background ions;
step seven: ions in the specified mass range are received by the microchannel plate detector and then output to the signal acquisition system.
Compared with the prior art, the invention has the following technical effects:
the gas phase pollutant of the invention is all-species gaolingThe sensitive online mass spectrometer directly feeds samples through a sample feeding pipe, and online detection can be realized without pretreatment; the ionization technology adopted by the invention is a high-sensitivity photoionization technology combining a high-flux light source with a high-pressure ion source, so that high-sensitivity detection can be realized; the invention ionizes all organic and inorganic pollution gases in the atmosphere through the high-energy photoionization ion source structure; removing high intensity N generated by the mass spectrometer when measuring air by using radio frequency quadrupole and pulse-compensation double electrode ion removal technology 2 + And O 2 + And the background ions are plasma, so that the problem that high-energy photons cannot be utilized is solved, and the technical application problem that the background ion strength is too high when the high-energy photoionization mass spectrum is actually used for measuring air is solved. The invention provides a novel gas-phase pollutant all-species high-sensitivity online mass spectrometer and a detection method by combining a high-energy photoionization ion source structure, a radio-frequency quadrupole and a pulse-compensation double-electrode ion removal technology, so that the gas-phase pollutant all-species high-sensitivity detection is realized, the problem that the existing mass spectrometry technology cannot be used for all-coverage and high-sensitivity detection of organic and inorganic polluted gas in the environment is solved, and the application range of mass spectrometry is widened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a gas phase contaminant whole species high sensitivity online mass spectrometer of the present invention;
wherein: 1. the ion source structure of high-energy photoionization, 2, ion transmission structure, 3, mass spectrum detection structure, 4, molecular pump, 5, discharge cavity, 6, radio frequency coil, 7, neon inlet pipe, 8, neon outlet pipe, 9, array type micropore channel plate, 10, ionization chamber, 11, sample injection pipe, 12, radio frequency quadrupole, 13, an electrostatic lens, 14, a pulse leading-out electrode, 15, an accelerating electrode, 16, a field-free flight zone, 17, a reflecting electrode, 18, a pulse-compensation double-electrode ion removing device, 19, a microchannel plate detector, 20, a signal acquisition system, 21, a discharge structure, 22 and a high-energy photon generating structure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the invention without any inventive effort, are intended to fall within the scope of the invention.
The invention aims to provide a gas-phase pollutant all-species high-sensitivity online mass spectrometer and a detection method, which are combined with a high-energy photoionization ion source structure, a radio-frequency quadrupole rod and a pulse-compensation double-electrode ion removing device to realize all-coverage high-sensitivity detection of all volatile organic pollutants in the atmosphere and inorganic pollutants such as carbon dioxide, sulfur dioxide, nitrogen oxide and the like, widen the applicable range of mass spectrometry detection and solve the problem that the existing mass spectrometry cannot achieve both the full coverage and the high-sensitivity detection of the gas-phase pollutants.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1: the embodiment provides a gas-phase pollutant all-species high-sensitivity online mass spectrometer, which comprises a high-energy photoionization ion source structure 1, an ion transmission structure 2 and a mass spectrum detection structure 3 which are sequentially communicated, wherein the interiors of the high-energy photoionization ion source structure 1, the ion transmission structure 2 and the mass spectrum detection structure 3 are all vacuum environments, and the vacuum environments of the structures are respectively provided by a molecular pump 4; the high-energy photoionization ion source structure 1 comprises a high-energy photon generation structure 22, a sample introduction pipe 11 and an ionization chamber 10, wherein the sample introduction pipe 11 and the ionization chamber 10 are vertically arranged, the high-energy photon generation structure 22 takes neon as discharge gas to generate high-energy photons, the high-energy photons are mixed with gas to be detected entering through the sample introduction pipe 11 in the ionization chamber 10, and the gas to be detected is ionized; the ion transmission structure 2 comprises a radio-frequency quadrupole 12 and an electrostatic lens 13, one end of the radio-frequency quadrupole 12 corresponds to the outlet of the high-energy photoionization ion source structure 1, the other end of the radio-frequency quadrupole 12 corresponds to the electrostatic lens 13, the radio-frequency quadrupole 12 is used for filtering non-target background ions, reducing background noise, and the electrostatic lens 13 is used for focusing ions; the mass spectrum detection structure 3 comprises a pulse extraction electrode 14, an accelerating electrode 15, a field-free flight zone 16, a reflecting electrode 17, a pulse-compensation double-electrode ion removing device 18, a micro-channel plate detector 19 and a signal acquisition system 20, wherein ions entering the mass spectrum detection structure 3 are extracted by the pulse extraction electrode 14 and enter the accelerating electrode 15 for acceleration, the accelerating electrode 15 is positioned at an inlet on one side of the field-free flight zone 16, the reflecting electrode 17 is arranged on the other side of the field-free flight zone 16, an outlet is further arranged on one side of the field-free flight zone 16, the pulse-compensation double-electrode ion removing device 18 is arranged at the outlet, ions entering the field-free flight zone 16 from the inlet move in the field-free flight zone 16 and are reflected and reversely move under the action of the reflecting electrode 17 and leave the field-free flight zone 16 from the outlet, the pulse-compensation double-electrode ion removing device 18 is used for further removing non-target background ions, and the micro-channel plate detector 19 is used for receiving ions in a specified mass range controlled by the pulse-compensation double-electrode ion removing device 18 and outputting the ions to the signal acquisition system 20. In this embodiment, the direction of movement of ions in the ion transport structure 2 is perpendicular to the direction of movement in the mass detection structure 3.
Specifically, in this embodiment, the high-energy photon generating structure 22 includes a discharge structure 21, a radio frequency coil 6, a neon inlet tube 7, and a neon outlet tube 8, the radio frequency coil 6 is wound on the discharge structure 21, the discharge structure 21 is cylindrical, the discharge structure 21 is provided with a discharge chamber 5, and the neon inlet tube 7 and the neon outlet tube 8 are both in communication with the discharge chamber 5. The discharge structure 21 is made of quartz, neon enters the discharge chamber 5 from the neon inlet tube 7 and flows out from the neon outlet tube 8, and the air pressure in the discharge chamber 5 is 50-1000Pa.
In this embodiment, the high-energy photoionization ion source structure 1 further includes an array type micro-porous channel plate 9, the array type micro-porous channel plate 9 is disposed between the discharge chamber 5 and the ionization chamber 10, and the array type micro-porous channel plate 9 is used for transmitting high-energy photons. The array type micro-hole channel plate 9 is used for replacing magnesium fluoride crystal window sheets, and the leakage of discharge gas to the ionization chamber 10 and the reflux of gas to be measured to the discharge chamber 5 are weakened by utilizing air resistance while light is transmitted, so that the pressure of rare gas in the discharge chamber 5 is maintained, and the light is normally emitted.
In this embodiment, the discharge chamber 5, the ionization chamber 10, the rf quadrupole 12 and the electrostatic lens 13 are coaxially arranged in this order.
In this embodiment, the pulse-compensated double electrode ion removing apparatus 18 includes a pulse electrode and a compensation electrode, a gap of 1-3mm is provided between the pulse electrode and the compensation electrode, the pulse electrode provides a forward electric field for passing ions in a specified pulse width time, and provides a reverse strong electric field for preventing ions from passing in the rest time, and the compensation electrode has a reverse stable voltage for suppressing permeation of non-target background ions and secondary ions and baseline drift.
In the embodiment, neon is used as discharge gas, the high-energy photoionization ion source uses neon as discharge gas, high-energy photons with 16.67eV energy are generated by discharge, the high-energy photons enter the ionization chamber 10 through the array type microporous channel plate 9, gas phase substances to be detected are ionized by the high-energy photons after entering the ionization chamber 10 through the sampling tube 11, and as the ionization energy of most organic and inorganic gases is less than 16.67eV, all organic and inorganic pollution gases in the atmosphere can be ionized by the transmitted high-energy photons; ions generated by ionization enter the ion transport structure 2 from the outlet of the ionization chamber 10, a large number N 2 + And O 2 + The non-target background ions are filtered by the radio-frequency quadrupole 12, focused by the electrostatic lens 13 and enter the mass spectrum detection structure 3; the ions to be measured are led out, accelerated and reflected by the pulse and then reach the pulse-compensation double-electrode ion removing device 18; the pulse electrodes of the pulse-compensated bipolar ion removal device 18 provide a forward electric field within a specified pulse width to allow ions to pass through, and ions whose time of flight is outside the pulse width period cannot pass through, the compensation electrodes of the pulse-compensated bipolar ion removal device 18 have a reverse constant voltage for suppressing the permeation of non-target background ions and secondary ionsPenetrating, thereby further removing residual background ions; finally, the ions to be measured acquire mass spectrum signals through a microchannel plate detector 19 and a signal acquisition system 20.
In the embodiment, neon is used as discharge gas to generate high-energy photons with energy up to 16.7 eV; an array type micro-hole channel plate is used for replacing a magnesium fluoride crystal window, and when light is transmitted, the leakage of discharge gas to an ionization chamber and the reflux of gas to be measured to a discharge cavity are weakened by utilizing air resistance, so that the pressure of rare gas in the discharge cavity is maintained, and the discharge cavity emits light normally; because the ionization energy of most organic and inorganic gases is less than 16.67eV, all organic and inorganic pollution gases in the atmosphere can be ionized by the transmitted high-energy photons; the low mass discrimination effect of the rf quadrupole 12 at the ion source outlet is used in conjunction with a pulse-compensated double electrode ion removal device 18 at the ion detector (microchannel plate detector 19) inlet to remove the high intensity N generated by the mass spectrum in measuring air 2 + And O 2 + The plasma background ion avoids the saturation or damage of the measurement of the ion detector (the microchannel plate detector 19), thereby solving the problem that high-energy photons cannot be utilized, and the technical application problem that the background ion strength is too high when the high-energy photoionization mass spectrum is actually used for measuring air, and realizing the high-sensitivity online detection of all the species of the gas-phase pollutants.
Example two
The embodiment provides a detection method of a gas-phase pollutant all-species high-sensitivity online mass spectrometer, which comprises the following steps:
step one: the molecular pump 4 is used for providing a vacuum environment for the high-energy photoionization ion source, the ion transmission structure 2 and the mass spectrum detection structure 3;
step two: neon enters the discharge cavity 5 through the neon inlet tube 7, flows out through the neon outlet tube 8, and maintains a certain pressure in the discharge cavity 5; the neon in the discharge cavity 5 is excited by the radio frequency coil 6 to generate high-energy photons;
step three: the high-energy photons enter an ionization chamber 10 through the array type micro-pore channel plate 9, are mixed with the gas to be detected introduced by the sample injection pipe 11, and ionize the gas to be detected;
step four: ionization generationFrom the outlet of the ionization chamber 10 into the ion transport structure 2, a large number N 2 + And O 2 + The non-target background ions are filtered by the radio-frequency quadrupole 12 and then focused by the electrostatic lens 13 to enter the mass spectrum detection structure 3;
step five: ions entering the mass spectrum detection structure 3 are extracted by a forward electric field provided by the pulse extraction electrode 14; then under the action of the accelerating electrode 15, ions enter the field-free flight area 16 at a higher speed, and after flying at a constant speed for a period of time, the ions are repelled by a reverse electric field provided by the reflecting electrode 17 and move reversely;
step six: the ions reach the pulse-compensated double electrode ion removal device 18 to further remove the remaining non-target background ions;
step seven: ions within the specified mass range are received by the microchannel plate detector 19 and output to the signal acquisition system 20.
The principles and embodiments of the present invention have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A gas phase contaminant whole species high sensitivity on-line mass spectrometer, characterized in that: the device comprises a high-energy photoionization ion source structure, an ion transmission structure and a mass spectrum detection structure which are sequentially communicated; the high-energy photoionization ion source structure comprises a high-energy photon generation structure, a sample feeding tube and an ionization chamber, wherein neon is used as discharge gas in the high-energy photon generation structure to generate high-energy photons, and the high-energy photons are mixed with gas to be detected entering through the sample feeding tube in the ionization chamber and ionize the gas to be detected; the ion transmission structure comprises a radio-frequency quadrupole rod and an electrostatic lens, one end of the radio-frequency quadrupole rod corresponds to an outlet of the high-energy photoionization ion source structure, the other end of the radio-frequency quadrupole rod corresponds to the electrostatic lens, the radio-frequency quadrupole rod is used for filtering non-target background ions, and the electrostatic lens is used for focusing ions; the mass spectrum detection structure comprises a pulse extraction electrode, an accelerating electrode, a field-free flight area, a reflecting electrode, a pulse-compensation double-electrode ion removing device, a micro-channel plate detector and a signal acquisition system, wherein ions entering the mass spectrum detection structure are extracted by the pulse extraction electrode and enter the accelerating electrode for acceleration, the accelerating electrode is positioned at an inlet on one side of the field-free flight area, the reflecting electrode is arranged on the other side of the field-free flight area, an outlet is further arranged on one side of the field-free flight area, the pulse-compensation double-electrode ion removing device is arranged at the outlet, ions entering the field-free flight area from the inlet move in the field-free flight area, when the ions move to the reflecting electrode, the ions are reflected and reversely move under the action of the reflecting electrode, the ions leave the field-free flight area from the outlet, the pulse-compensation double-electrode ion removing device is used for further removing non-target background ions, and the micro-channel plate detector is used for receiving ions in a specified mass range controlled by the pulse-compensation double-electrode ion removing device and outputting the ions to the signal acquisition system.
2. The gas phase contaminant whole species high sensitivity online mass spectrometer of claim 1, wherein: the high-energy photon generating structure comprises a discharge structure, a radio frequency coil, a neon inlet pipe and a neon outlet pipe, wherein the radio frequency coil is wound on the discharge structure, the discharge structure is provided with a discharge cavity, and the neon inlet pipe and the neon outlet pipe are communicated with the discharge cavity.
3. The gas phase contaminant whole species high sensitivity online mass spectrometer of claim 2, wherein: the discharge structure is made of quartz, and the air pressure in the discharge cavity is 50-1000Pa.
4. The gas phase contaminant whole species high sensitivity online mass spectrometer of claim 2, wherein: the high-energy photoionization ion source structure further comprises an array type micropore channel plate, wherein the array type micropore channel plate is arranged between the discharge cavity and the ionization chamber and is used for transmitting high-energy photons.
5. The gas phase contaminant whole species high sensitivity online mass spectrometer of claim 2, wherein: the discharge cavity, the ionization chamber, the radio-frequency quadrupole rods and the electrostatic lens are coaxially arranged in sequence.
6. The gas phase contaminant whole species high sensitivity online mass spectrometer of claim 1, wherein: the pulse-compensation double-electrode ion removing device comprises a pulse electrode and a compensation electrode, wherein a gap is arranged between the pulse electrode and the compensation electrode, the pulse electrode provides a forward electric field to enable ions to pass through in a designated pulse width time, the rest time provides a reverse strong electric field to prevent the ions from passing through, and the compensation electrode has a reverse stable voltage for inhibiting permeation and baseline drift of non-target background ions and secondary ions.
7. The gas phase contaminant whole species high sensitivity online mass spectrometer of claim 1, wherein: the high-energy photoionization ion source structure, the ion transmission structure and the mass spectrum detection structure are all in vacuum environments.
8. A detection method using the gas phase contaminant whole species high sensitivity on-line mass spectrometer as claimed in any one of claims 1-7, wherein: the method comprises the following steps:
step one: providing a vacuum environment for a high-energy photoionization ion source, an ion transmission structure and a mass spectrum detection structure;
step two: neon enters the discharge cavity from the neon inlet pipe, flows out from the neon outlet pipe, and maintains a certain pressure in the discharge cavity; the neon in the discharge cavity is excited by the radio frequency coil to generate high-energy photons;
step three: the high-energy photons enter an ionization chamber through the array type micro-hole channel plate, are mixed with the gas to be detected introduced by the sample injection pipe, and ionize the gas to be detected;
step four: ions generated by ionization enter an ion transmission structure from an outlet of an ionization chamber, and part of non-target background ions are filtered by a radio-frequency quadrupole rod and then focused by an electrostatic lens to enter a mass spectrum detection structure;
step five: ions entering the mass spectrum detection structure are led out by a forward electric field provided by the pulse leading-out electrode; then, under the action of the accelerating electrode, ions enter a field-free flight area, and after flying at a constant speed for a period of time, the ions are repelled by a reverse electric field provided by the reflecting electrode and move reversely;
step six: the ions reach a pulse-compensation double-electrode ion removing device to further remove the residual non-target background ions;
step seven: ions in the specified mass range are received by the microchannel plate detector and then output to the signal acquisition system.
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| CN202310033959.4A CN116031138A (en) | 2023-01-10 | 2023-01-10 | Gas-phase pollutant all-species high-sensitivity online mass spectrometer and detection method |
| ZA2023/03029A ZA202303029B (en) | 2023-01-10 | 2023-02-28 | Online mass spectrometer for full-scale high-sensitive detection of gas-phase pollutants and detection method |
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| CN202310033959.4A CN116031138A (en) | 2023-01-10 | 2023-01-10 | Gas-phase pollutant all-species high-sensitivity online mass spectrometer and detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117147670A (en) * | 2023-10-26 | 2023-12-01 | 广州源古纪科技有限公司 | VOCs detection method, system and equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147670A (en) * | 2023-10-26 | 2023-12-01 | 广州源古纪科技有限公司 | VOCs detection method, system and equipment |
| CN117147670B (en) * | 2023-10-26 | 2023-12-29 | 广州源古纪科技有限公司 | VOCs detection method, system and equipment |
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