Mass spectrum ionization device and method for cooperatively monitoring dirt and carbon

Abstract

The invention relates to the technical field of mass spectrum analyzers, in particular to a mass spectrum ionization device and method for cooperatively monitoring dirt and carbon. The device comprises a high-pressure photochemical ionization cavity and a low-pressure photoelectron ionization cavity, an ion transmission module and an ion convergence reaction electrode group are arranged in the high-pressure photochemical ionization cavity; organic product ions are generated in the high-pressure photochemical ionization cavity and penetrate through a differential electrode to be transmitted into the low-pressure photoelectron ionization cavity; an electron transmission module, an ion convergence multi-pole rod group and an ion extraction electrode are arranged in the low-pressure photoelectron ionization cavity, the low-pressure photoelectron ionization cavity generates inorganic product ions, and the inorganic product ions and organic product ions penetrate through the ion extraction electrode and are transmitted to the mass analyzer for detection. Cascade connection of the two ion sources under different working air pressures is realized through vacuum difference, so that ionization detection of the two ionization sources can be obtained through single sample introduction, the analysis coverage of a mass spectrometer is greatly improved, and the application field is widened.

Description

Technical Field

[0001] This invention relates to the field of mass spectrometry analysis technology, and in particular to a mass spectrometry ionization device and method for co-monitoring pollution and carbon. Background Technology

[0002] Flue gas pollutants include VOCs, NH3, and CO2, which are under key control in key industries. They are characterized by complex background matrices, diverse types, wide concentration ranges, and significant property differences. VOCs are major precursors to ozone (O3) and secondary organic particulate matter (SOA); NH3 is an important precursor to secondary inorganic ammonium salts, and "ammonia escape" not only affects solar radiation intensity but also exacerbates photochemical pollution; CO2, as a major greenhouse gas, will trigger a series of climate changes, including global warming. High coverage, high sensitivity, and high accuracy monitoring of VOCs, NH3, and CO2 in flue gas are prerequisites for tracing the causes and controlling complex atmospheric pollution. However, commonly used FTIR and other spectroscopic techniques suffer from cross-interference of complex system components, affecting measurement accuracy. While GC-MS is the gold standard for analysis and detection, its long analysis cycle and complex procedures are unsuitable for long-term continuous monitoring of flue gas pollutants. Online mass spectrometry offers fast analysis speed and high sensitivity, but the ionization coverage and accurate identification capabilities of current technologies cannot yet meet the needs of coordinated monitoring of pollutants and carbon.

[0003] A search of patents and papers revealed the following relevant patent: Shandong University disclosed a pressure-controlled photoelectron ionization and chemical ionization switching system and method on August 25, 2023. This system regulates the ionization source pressure by switching flow rate and center aperture, enabling photoelectron ionization at low pressure and chemical ionization at medium pressure. However, this switching method is cumbersome, requiring adjustments to flow rate and aperture, making real-time control difficult and unsuitable for co-monitoring of atmospheric pollution and carbon. Therefore, there is an urgent need to develop a mass spectrometry ionization method for co-monitoring pollution and carbon to achieve simultaneous measurement of trace organic matter and inorganic components such as CO2. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a mass spectrometry ionization device for co-monitoring pollution and carbon, so as to solve the problem of co-monitoring of organic pollutants and inorganic components such as CO2.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In one aspect, the present invention provides a mass spectrometry ionization device for co-monitoring pollution and carbon, comprising a high-pressure photochemical ionization cavity and a low-pressure photoelectron ionization cavity, both of which operate under vacuum and achieve vacuum differential through a plate-shaped differential electrode with a central hole.

[0007] The high-pressure photochemical ionization cavity is equipped with an ion transport module and an ion convergence reaction electrode group coaxial with the differential electrode. The ion transport module is used for ion generation and transport. The ion convergence reaction electrode group is used for chemical reaction ionization with trace organic compound components in the sample gas molecules to generate organic product ions and transport the organic product ions through the differential electrode to the low-pressure photoelectron ionization cavity.

[0008] The low-pressure photoelectron ionization cavity is equipped with an electron transport module, an ion converging multipole group, and an ion extraction electrode in sequence. The electron transport module is used to generate photoelectrons and generate inorganic product ions by colliding with inorganic components in the sample gas molecules. The ion converging multipole group is used to transmit inorganic and organic product ions through the central hole of the ion extraction electrode to the mass analyzer for detection. Vacuum differential is achieved between the low-pressure photoelectron ionization cavity and the mass analyzer through the ion extraction electrode.

[0009] The ion transport module includes a first vacuum ultraviolet light source, an axial ion extraction electrode, and an axial electron extraction electrode arranged sequentially at intervals along the optical path. A reagent gas inlet pipe is introduced between the first vacuum ultraviolet light source and the axial ion extraction electrode, and a sample gas inlet pipe is introduced between the axial electron extraction electrode and the ion convergence reaction electrode group. The first vacuum ultraviolet light source is used to generate photons to directly photoionize or photoelectron ionize the reagent gas. The generated ions are extracted into the ion convergence reaction electrode group under the action of the axial ion extraction electrode and the axial electron extraction electrode.

[0010] Both the axial ion extraction electrode and the axial electron extraction electrode are flat plate structures with a central through hole, and the central hole is coaxial.

[0011] The ion-converging reaction electrode assembly includes two or more parallel and spaced-apart converging electrodes. Each converging electrode is a flat plate structure with a central through hole, and the central holes of each converging electrode are coaxial.

[0012] The ion-converging reaction electrode group is a uniform electrostatic field ion-converging reaction region composed of multiple identical converging electrodes; or, the ion-converging reaction electrode group is an electrostatic field or radio frequency field ion-converging reaction region composed of multiple converging electrodes with successively decreasing inner diameters.

[0013] The inner diameter of the reagent gas inlet line and the sample gas inlet line is 0.1-2 mm, and the flow rate is 1-100 mL / min.

[0014] The electron transport module includes a second vacuum ultraviolet light source, a vertical electron accelerating electrode, and a vertical electron extraction electrode arranged sequentially along a direction perpendicular to the axis of the differential electrode. The vertical electron accelerating electrode and the vertical electron extraction electrode are arranged at equal intervals on both sides of the axis of the differential electrode. The light emitted by the second vacuum ultraviolet light source irradiates the vertical electron extraction electrode to generate photoelectrons. The photoelectrons are accelerated and collide with inorganic components in the sample gas molecules under the action of the electric field between the vertical electron accelerating electrode and the vertical electron extraction electrode, generating inorganic product ions.

[0015] The vertical electron accelerating electrode is a flat plate structure with a central through hole, and the central through hole is coaxial with the light emission hole of the second vacuum ultraviolet light source; the vertical electron extraction electrode is a flat plate structure, placed parallel to the vertical electron accelerating electrode below it.

[0016] The ion converging multipole group is composed of radio frequency multipoles, and the central axis of the ion converging multipole group coincides with the central axis of the differential electrode; the ion extraction electrode is a flat plate structure with a through hole in the center.

[0017] The high-pressure photochemical ionization cavity operates at a pressure range of 10 Pa to 5000 Pa; the low-pressure photoelectron ionization cavity operates at a pressure range of 0.01 Pa to 10 Pa.

[0018] Another aspect of the present invention provides a mass spectrometry ionization method for co-monitoring pollution and carbon, which is implemented using the pollution and carbon co-monitoring mass spectrometry ionization device described above. The method includes the following steps:

[0019] 1) The reagent gas and sample gas are introduced into the high-pressure photochemical ionization cavity; the photons generated by the first vacuum ultraviolet light source directly photoionize or photoelectron ionize the reagent gas; the generated ions are drawn out to the ion convergence reaction electrode group under the action of the axial ion extraction electrode and the axial electron extraction electrode, and chemically react with the trace organic compound components in the introduced sample gas molecules to generate organic product ions. The organic product ions pass through the central hole of the differential electrode under the action of the ion convergence reaction electrode group and are transported to the low-pressure photoelectron ionization cavity.

[0020] 2) Unionized inorganic components in the sample gas pass through the central hole of the differential electrode and enter the low-pressure photoelectron ionization chamber under the action of vacuum differential. The light emitted by the second vacuum ultraviolet light source irradiates the vertical electron extraction electrode to generate photoelectrons. The photoelectrons are accelerated and collide with the inorganic component sample under the action of the electric field between the vertical electron accelerating electrode and the vertical electron extraction electrode, generating inorganic product ions. Under the action of the ion converging multi-pole group, the inorganic product ions and the organic product ions that have entered the low-pressure photoelectron ionization chamber pass through the central hole of the ion extraction electrode and are transmitted to the mass analyzer for detection.

[0021] The advantages and beneficial effects of this invention are as follows: This invention ingeniously achieves the cascading of two ion sources under different working pressures through vacuum differential, thereby enabling the detection of ionization from two ion sources in a single sample injection, greatly improving the analytical coverage of the mass spectrometer, and thus realizing the simultaneous measurement of organic and inorganic substances in pollutant carbon components. Attached Figure Description

[0022] The accompanying drawings further illustrate the present invention, but the content of the drawings does not constitute any limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of a mass spectrometry ionization device for co-monitoring pollution and carbon according to the present invention.

[0024] In the figure: 1 is the first vacuum ultraviolet light source, 2 is the axial ion extraction electrode, 3 is the axial electron extraction electrode, 4 is the ion convergence reaction electrode group, 5 is the differential electrode, 6 is the second vacuum ultraviolet light source, 7 is the vertical electron acceleration electrode, 8 is the ion convergence multipole group, 9 is the mass analyzer, 10 is the ion extraction electrode, 11 is the low-pressure photoelectron ionization cavity, 12 is the vertical electron extraction electrode, 13 is the convergence electrode, 14 is the high-pressure photochemical ionization cavity, 15 is the sample gas inlet pipeline, and 16 is the reagent gas inlet pipeline. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0027] See Figure 1As shown, an embodiment of the present invention provides a mass spectrometry ionization device for co-monitoring of pollution and carbon, including a high-pressure photochemical ionization cavity 14 and a low-pressure photoelectron ionization cavity 11, both of which operate under vacuum and achieve vacuum differential through a plate-shaped differential electrode 5 with a hole in the middle.

[0028] With the upward direction as the Y direction and the rightward direction as the X direction, the high-pressure photochemical ionization cavity 14 operates under vacuum with a working pressure of P1; the low-pressure photoelectron ionization cavity 11 operates under vacuum with a pressure of P2, and P1 is greater than P2; the high-pressure photochemical ionization cavity 14 and the low-pressure photoelectron ionization cavity 11 are connected in series along the X direction, and vacuum differential is achieved through a plate-shaped differential electrode 5 with a through hole in the middle.

[0029] The high-pressure photochemical ionization cavity 14 is sequentially equipped with an ion transport module and an ion convergence reaction electrode group 4, coaxial with the differential electrode 5. The ion transport module is used for ion generation and transport. The ion convergence reaction electrode group 4 is used for ion chemical reaction ionization with trace organic compound components in the sample gas molecules to generate organic product ions, which are then transported through the differential electrode 5 to the low-pressure photoelectron ionization cavity 11. The low-pressure photoelectron ionization cavity 11 is sequentially equipped with an electron transport module, an ion convergence multipole group 8, and an ion extraction electrode 10. The electron transport module is used to generate photoelectrons and generate inorganic product ions by colliding with inorganic components in the sample gas molecules. The ion convergence multipole group 8 is used to transport inorganic and organic product ions through the central hole of the ion extraction electrode 10 to the mass analyzer 9 for detection. Vacuum differential is achieved between the low-pressure photoelectron ionization cavity 11 and the mass analyzer 9 through the ion extraction electrode 10.

[0030] In an embodiment of the present invention, the ion transport module includes a first vacuum ultraviolet light source 1, an axial ion extraction electrode 2, and an axial electron extraction electrode 3 arranged sequentially at intervals along the optical path. The first vacuum ultraviolet light source 1 is fixed and sealed to the left side of the high-pressure photochemical ionization cavity 14, and a light-emitting aperture is provided at the light-emitting point. A reagent gas inlet pipe 16 is introduced between the first vacuum ultraviolet light source 1 and the axial ion extraction electrode 2, and a sample gas inlet pipe 15 is introduced between the axial electron extraction electrode 3 and the ion convergence reaction electrode group 4. The first vacuum ultraviolet light source 1 is used to generate photons to directly photoionize or photoelectron ionize the reagent gas, and the generated ions are extracted into the ion convergence reaction electrode group 4 under the action of the axial ion extraction electrode 2 and the axial electron extraction electrode 3.

[0031] In embodiments of the present invention, both the axial ion extraction electrode 2 and the axial electron extraction electrode 3 are flat plate structures with a central through hole, and the central hole is coaxial. The ion convergence reaction electrode group 4 includes two or more parallel and spaced-apart convergence electrodes 13, each of which is a flat plate structure with a central through hole, and the central holes of each convergence electrode are coaxial.

[0032] Preferably, the ion converging reaction electrode group 4 is a radio frequency field ion converging reaction region composed of converging electrodes 13 with successively decreasing inner diameters.

[0033] In embodiments of the present invention, the ion convergence reaction electrode group 4 is a uniform electrostatic field ion convergence reaction region composed of a plurality of identical convergence electrodes 13; or, the ion convergence reaction electrode group 4 is an electrostatic field or radio frequency field ion convergence reaction region composed of a plurality of convergence electrodes 13 with successively decreasing inner diameters.

[0034] Specifically, the reagent gas inlet line 16 and the sample gas inlet line 15 pass through the lower end wall of the high-pressure photochemical ionization chamber 14 from the outside of the lower side. The upper outlet of the reagent gas inlet line 16 extends between the axial ion extraction electrode 2 and the axial electron extraction electrode 3. The upper outlet of the sample gas inlet line 15 extends between the axial electron extraction electrode 3 and the ion convergence reaction electrode group 4. The outer walls of the reagent gas inlet line 16 and the sample gas inlet line 15 are sealed to the lower end wall of the high-pressure photochemical ionization chamber 14.

[0035] Furthermore, the reagent gas inlet line 16 and the sample gas inlet line 15 can be made of one or more of the following materials: metal or non-metal, such as stainless steel, aluminum alloy, copper, PEEK, PTFE, plexiglass, etc. The inner diameter of the reagent gas inlet line 16 and the sample gas inlet line 15 is 0.1-2 mm, and the flow rate is 1-100 mL / min. Preferably, both the reagent gas inlet line 16 and the sample gas inlet line 15 are stainless steel capillaries with an inner diameter of 250 μm and a flow rate of approximately 10 mL.

[0036] In an embodiment of the present invention, the electron transport module includes a second vacuum ultraviolet light source 6, a vertical electron accelerating electrode 7, and a vertical electron extraction electrode 12 arranged sequentially along a direction perpendicular to the axis of the differential electrode 5. Specifically, the second vacuum ultraviolet light source 6 is placed inside a low-pressure photoelectron ionization cavity 11, with the light emission direction downwards and the X-direction perpendicular. The vertical electron accelerating electrode 7 and the vertical electron extraction electrode 12 are arranged sequentially along the light emission direction of the second vacuum ultraviolet light source 6, and are equally spaced on both sides of the axis of the differential electrode 5. The light emitted from the second vacuum ultraviolet light source 6 irradiates the vertical electron extraction electrode 12 to generate photoelectrons. These photoelectrons are accelerated and collide with inorganic components in the sample gas molecules under the influence of the electric field between the vertical electron accelerating electrode 7 and the vertical electron extraction electrode 12, generating inorganic product ions.

[0037] In an embodiment of the present invention, the vertical electron accelerating electrode 7 is a flat plate structure with a central through hole, and the central through hole is coaxial with the light emission hole of the second vacuum ultraviolet light source 6; the vertical electron extraction electrode 12 is a flat plate structure and is placed parallel to the vertical electron accelerating electrode 7 below.

[0038] In this embodiment of the invention, the ion converging multipole group 8 is composed of radio frequency multipoles, and the central axis of the ion converging multipole group 8 coincides with the central axis of the differential electrode 5; the ion extraction electrode 10 is a flat plate structure with a through hole in the center. The ion extraction electrode 10 is coaxial with the central hole of the differential electrode 5; the low-pressure photoelectron ionization cavity 11 and the mass analyzer 9 are separated by the ion extraction electrode 10 to achieve vacuum differential.

[0039] Furthermore, the ion-converging multipole assembly 8 can be composed of conventional cylindrical quadrupoles, hexapoles, octapoles, or more poles; it can also be composed of rectangular quadrupoles, hexapoles, octapoles, or more poles; in addition, it can also be composed of segmented quadrupoles, hexapoles, octapoles, etc., that can provide an axial electric field.

[0040] Preferably, the ion-converging multipole group 8 adopts a radio frequency octupole transmission structure to meet a wider range of ion transmission quality.

[0041] Furthermore, the high-pressure photochemical ionization cavity 14 operates under vacuum, with a working pressure P1 ranging from 10 Pa to 5000 Pa; the low-pressure photoelectron ionization cavity 11 operates under vacuum, with a working pressure P2 ranging from 0.01 Pa to 10 Pa.

[0042] Preferably, the high-pressure photochemical ionization cavity 14 operates under vacuum with a working pressure P1 of 500 Pa, which meets the chemical ionization pressure requirements; the low-pressure photoelectron ionization cavity 11 operates under vacuum with a working pressure P2 of 1 Pa, which meets the photoelectron ionization pressure requirements while ensuring the molecular number density as much as possible.

[0043] Furthermore, the first vacuum ultraviolet light source 1 and the second vacuum ultraviolet light source 6 are one or two of the following: gas discharge lamp light source, laser light source, or synchrotron radiation light source.

[0044] Preferably, the first vacuum ultraviolet light source 1 and the second vacuum ultraviolet light source 6 are gas discharge lamp light sources, and DC Kr gas discharge lamps with small size and low power consumption are selected.

[0045] Furthermore, the mass analyzer 9 is a time-of-flight mass analyzer, a quadrupole mass analyzer, or an ion trap mass analyzer.

[0046] Preferably, the quality analyzer 9 is a time-of-flight quality analyzer, which has a wider quality range and higher resolution, helping to improve the analysis range and enhance qualitative accuracy.

[0047] One embodiment of the present invention provides a mass spectrometry ionization device for co-monitoring of pollution and carbon. By cleverly using vacuum differential, it realizes the cascading of two ion sources under different working pressures, so that the sample can be ionized and detected by two ionization sources in a single injection, which greatly improves the analytical coverage of the mass spectrometer and enables the simultaneous measurement of organic and inorganic substances in pollution and carbon components.

[0048] Another embodiment of the present invention provides a mass spectrometry ionization method for co-monitoring pollution and carbon, which is implemented using the mass spectrometry ionization device for co-monitoring pollution and carbon as described in the above embodiment. The method includes the following steps:

[0049] 1) The reagent gas and sample gas are introduced into the high-pressure photochemical ionization cavity 14; the photons generated by the first vacuum ultraviolet light source 1 directly photoionize or photoelectron ionize the reagent gas; the generated ions are drawn out to the ion convergence reaction electrode group 4 under the action of the axial ion extraction electrode 2 and the axial electron extraction electrode 3, and chemically react with the trace organic compound components in the introduced sample gas molecules to generate organic product ions. The organic product ions pass through the central hole of the differential electrode 5 under the action of the ion convergence reaction electrode group 4 and are transported to the low-pressure photoelectron ionization cavity 11.

[0050] 2) Unionized inorganic components in the sample gas pass through the central hole of the differential electrode 5 and enter the low-pressure photoelectron ionization chamber 11 under the action of vacuum differential. The light emitted by the second vacuum ultraviolet light source 6 irradiates the vertical electron extraction electrode 12 to generate photoelectrons. The photoelectrons are accelerated and collide with the inorganic component sample under the action of the electric field between the vertical electron accelerating electrode 7 and the vertical electron extraction electrode 12, generating inorganic product ions. Under the action of the ion converging multi-pole group 8, the inorganic product ions and the organic product ions that enter the low-pressure photoelectron ionization chamber 11 pass through the central hole of the ion extraction electrode 10 and are transmitted to the mass analyzer 9 for detection.

[0051] Example 1

[0052] like Figure 1 As shown, the present invention provides a mass spectrometry ionization device for co-monitoring of pollution and carbon. Reagent gas and sample gas are introduced into a high-pressure photochemical ionization chamber 14 with a pressure of 500 Pa via a reagent gas inlet tube 16 (50 cm long, 250 μm inner diameter) and a sample gas inlet tube 15 (50 cm long, 250 μm inner diameter), respectively. Photons generated by a first vacuum ultraviolet light source 1 directly photoionize the reagent gas. The generated reagent ions are extracted to an ion-converging reaction electrode group 4 under the action of an axial ion extraction electrode 2 and an axial electron extraction electrode 3, and chemically react with trace organic compound components in the introduced sample gas molecules to generate organic product ions A, which pass through the ion-converging reaction electrode group 4. The differential electrode 5 has a central aperture that efficiently transmits the sample gas to a low-pressure photoelectron ionization chamber 11 with a pressure of 1 Pa. Unionized inorganic components in the sample gas pass through the central aperture of the differential electrode 5 and enter the low-pressure photoelectron ionization chamber 11 under the action of vacuum differential. The light emitted by the second vacuum ultraviolet light source 6 irradiates the vertical electron extraction electrode 12 to generate photoelectrons. The photoelectrons are accelerated and collide with the inorganic component sample under the action of the electric field between the vertical electron accelerating electrode 7 and the vertical electron extraction electrode 12, generating inorganic product ions B. Under the action of the ion converging multipole group 8, the inorganic product ions A that have entered the low-pressure photoelectron ionization chamber 11 pass through the central aperture of the ion extraction electrode 10 and are efficiently transmitted to the time-of-flight mass analyzer 9 for detection.

[0053] The spectral techniques commonly used for measuring pollutant carbon components, such as FTI R, suffer from cross-interference between components in complex systems, affecting measurement accuracy. While GC-MS is the gold standard for analysis and detection, its long analysis cycle and complex procedures make it unsuitable for long-term continuous monitoring of flue gas pollutant carbon. Online mass spectrometry offers high analysis speed and sensitivity, but the ionization coverage of current technologies cannot meet the needs of synergistic monitoring of pollutant carbon. High-pressure photochemical ionization is often suitable for analyzing low-concentration organic compounds, while low-pressure photoelectron ionization is suitable for ionizing high-concentration inorganic compounds, making it difficult to couple the two ionization methods. This invention cleverly utilizes vacuum differential to cascade two ion sources operating at different pressures, enabling the detection of ionization from both sources in a single sample injection. This significantly improves the analytical coverage of the mass spectrometer, allowing for the simultaneous measurement of organic and inorganic components in pollutant carbon, thus broadening its application scope.

[0054] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A mass spectrometry ionization device for co-monitoring pollution and carbon, characterized in that, It includes a high-pressure photochemical ionization cavity (14) and a low-pressure photoelectron ionization cavity (11) that both operate under vacuum and achieve vacuum differential through a plate-shaped differential electrode (5) with a hole in the middle; The high-pressure photochemical ionization cavity (14) is provided with an ion transport module and an ion convergence reaction electrode group (4) coaxial with the differential electrode (5). The ion transport module is used for the generation and transport of ions. The ion convergence reaction electrode group (4) is used for the chemical reaction and ionization of ions with trace organic compound components in the sample gas molecules to generate organic product ions and to transport the organic product ions through the differential electrode (5) to the low-pressure photoelectron ionization cavity (11). The low-pressure photoelectron ionization cavity (11) is provided with an electron transport module, an ion converging multipole group (8) and an ion extraction electrode (10) in sequence. The electron transport module is used to generate photoelectrons and generate inorganic product ions by colliding the inorganic components in the sample gas molecules with the photoelectrons. The ion converging multipole group (8) is used to transmit the inorganic product ions and organic product ions through the central hole of the ion extraction electrode (10) to the mass analyzer (9) for detection. The low-pressure photoelectron ionization cavity (11) and the mass analyzer (9) are connected by the ion extraction electrode (10) to achieve vacuum differential.

2. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 1, characterized in that, The ion transport module includes a first vacuum ultraviolet light source (1), an axial ion extraction electrode (2), and an axial electron extraction electrode (3) arranged sequentially at intervals along the optical path. A reagent gas inlet pipe (16) is introduced between the first vacuum ultraviolet light source (1) and the axial ion extraction electrode (2), and a sample gas inlet pipe (15) is introduced between the axial electron extraction electrode (3) and the ion convergence reaction electrode group (4). The first vacuum ultraviolet light source (1) is used to generate photons to directly photoionize or photoelectron ionize the reagent gas. The generated ions are extracted into the ion convergence reaction electrode group (4) under the action of the axial ion extraction electrode (2) and the axial electron extraction electrode (3).

3. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 2, characterized in that, Both the axial ion extraction electrode (2) and the axial electron extraction electrode (3) are flat plate structures with a central through hole, and the central hole is coaxial. The ion-converging reaction electrode group (4) includes two or more parallel and spaced-apart convergent electrodes (13). The convergent electrodes (13) are flat plate structures with through holes in the center, and the central holes of each convergent electrode are coaxial.

4. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 3, characterized in that, The ion-converging reaction electrode group (4) is a uniform electrostatic field ion-converging reaction region composed of multiple identical converging electrodes (13); or, the ion-converging reaction electrode group (4) is an electrostatic field or radio frequency field ion-converging reaction region composed of multiple converging electrodes (13) with successively decreasing inner diameters.

5. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 2, characterized in that, The inner diameter of the reagent gas inlet line (16) and the sample gas inlet line (15) is 0.1-2 mm, and the flow rate is 1-100 mL / min.

6. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 2, characterized in that, The electron transport module includes a second vacuum ultraviolet light source (6), a vertical electron accelerating electrode (7), and a vertical electron extraction electrode (12) arranged sequentially along a direction perpendicular to the axis of the differential electrode (5). The vertical electron accelerating electrode (7) and the vertical electron extraction electrode (12) are arranged at equal intervals on both sides of the axis of the differential electrode (5). The light emitted by the second vacuum ultraviolet light source (6) irradiates the vertical electron extraction electrode (12) to generate photoelectrons. The photoelectrons are accelerated and collide with the inorganic components in the sample gas molecules under the action of the electric field between the vertical electron accelerating electrode (7) and the vertical electron extraction electrode (12), generating inorganic product ions.

7. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 6, characterized in that, The vertical electron accelerating electrode (7) is a flat plate structure with a central through hole, and the central through hole is coaxial with the light output hole of the second vacuum ultraviolet light source (6); the vertical electron extraction electrode (12) is a flat plate structure and is placed parallel to the vertical electron accelerating electrode (7) below.

8. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 1, characterized in that, The ion converging multipole group (8) is composed of radio frequency multipoles, and the central axis of the ion converging multipole group (8) coincides with the central axis of the differential electrode (5); the ion extraction electrode (10) is a flat plate structure with a through hole in the center.

9. The mass spectrometry ionization device for co-monitoring pollution and carbon according to claim 1, characterized in that, The working pressure range of the high-pressure photochemical ionization cavity (14) is 10 Pa to 5000 Pa; the working pressure range of the low-pressure photoelectron ionization cavity (11) is 0.01 Pa to 10 Pa.

10. A mass spectrometry ionization method for synergistic monitoring of pollution and carbon, characterized in that, This method, implemented using the pollution and carbon synergistic monitoring mass spectrometry ionization device as described in claim 6, includes the following steps: 1) The reagent gas and sample gas are introduced into the high-pressure photochemical ionization cavity (14); the photons generated by the first vacuum ultraviolet light source (1) directly photoionize or photoelectron ionize the reagent gas; the generated ions are drawn out to the ion convergence reaction electrode group (4) under the action of the axial ion extraction electrode (2) and the axial electron extraction electrode (3), and chemically react with the trace organic compound components in the introduced sample gas molecules to generate organic product ions. The organic product ions pass through the central hole of the differential electrode (5) under the action of the ion convergence reaction electrode group (4) and are transported to the low-pressure photoelectron ionization cavity (11); 2) Unionized inorganic components in the sample gas pass through the central hole of the differential electrode (5) and enter the low-pressure photoelectron ionization chamber (11) under the action of vacuum differential. The light emitted by the second vacuum ultraviolet light source (6) irradiates the vertical electron extraction electrode (12) to generate photoelectrons. The photoelectrons are accelerated and collide with the inorganic component sample under the action of the electric field between the vertical electron acceleration electrode (7) and the vertical electron extraction electrode (12) to generate inorganic product ions. Under the action of the ion convergence multipole group (8), the inorganic product ions and the organic product ions that enter the low-pressure photoelectron ionization chamber (11) pass through the central hole of the ion extraction electrode (10) and are transmitted to the mass analyzer (9) for detection.

Images