CN116487240A - Vortex gas collecting medium blocking air discharge ion source and environment emission object detection method - Google Patents
Vortex gas collecting medium blocking air discharge ion source and environment emission object detection method Download PDFInfo
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- CN116487240A CN116487240A CN202310440168.3A CN202310440168A CN116487240A CN 116487240 A CN116487240 A CN 116487240A CN 202310440168 A CN202310440168 A CN 202310440168A CN 116487240 A CN116487240 A CN 116487240A
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- air discharge
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- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000000903 blocking effect Effects 0.000 title claims abstract description 8
- 150000002500 ions Chemical class 0.000 claims abstract description 39
- 230000004888 barrier function Effects 0.000 claims abstract description 17
- 230000007613 environmental effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- 239000010453 quartz Substances 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- SFDJOSRHYKHMOK-UHFFFAOYSA-N nitramide Chemical compound N[N+]([O-])=O SFDJOSRHYKHMOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 53
- 239000002360 explosive Substances 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- -1 nitro ions Chemical class 0.000 abstract description 4
- 150000001450 anions Chemical class 0.000 abstract description 3
- 238000010891 electric arc Methods 0.000 abstract description 2
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 abstract description 2
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 abstract description 2
- 239000003989 dielectric material Substances 0.000 abstract 1
- 239000003570 air Substances 0.000 description 54
- 230000007935 neutral effect Effects 0.000 description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Chemical compound ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 description 6
- 238000001819 mass spectrum Methods 0.000 description 6
- TZRXHJWUDPFEEY-UHFFFAOYSA-N Pentaerythritol Tetranitrate Chemical compound [O-][N+](=O)OCC(CO[N+]([O-])=O)(CO[N+]([O-])=O)CO[N+]([O-])=O TZRXHJWUDPFEEY-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 3
- 239000012159 carrier gas Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000000065 atmospheric pressure chemical ionisation Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- FZRKAZHKEDOPNN-UHFFFAOYSA-N Nitric oxide anion Chemical compound O=[N-] FZRKAZHKEDOPNN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical class OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000451 chemical ionisation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001601 dielectric barrier discharge ionisation Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000037427 ion transport Effects 0.000 description 1
- 238000005040 ion trap Methods 0.000 description 1
- 230000000155 isotopic effect Effects 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/68—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using electric discharge to ionise a gas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/105—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation, Inductively Coupled Plasma [ICP]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Plasma & Fusion (AREA)
- Engineering & Computer Science (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention discloses a vortex gas collecting medium blocking air discharge ion source and a method for detecting environment dissipation objects. The vortex gas collection module comprises a vortex gas collection port, an air pump, a gas circuit interface and a power supply module; the air dielectric barrier discharge technology structurally comprises a convenient power supply, a high-frequency alternating current module, electrodes and dielectrics. The ion source has the functions of enrichment and ionization, is small in size and reliable in structure, is suitable for scenes of on-line detection of environmental dissipation objects and atmospheric pollution sites, limits discharge current due to the existence of a dielectric layer, avoids forming an electric arc, and has good safety. The device has unique advantages in detection of explosives due to rich nitrogen-oxygen background in the air, and the product of the device can be added with primary nitro ions to form target anions with nitro groups, so that the sensitivity of a test target is improved, and real detection with high sensitivity is realized.
Description
Technical Field
The invention relates to the field of normal pressure ion sources, in particular to a vortex gas collecting medium blocking air discharge ion source and an environment emission object detection method.
Background
The ion source is a chemical ionization means, is commonly used for the first part of mass spectrometry, the traditional ion source comprises an electron bombardment ion source (EI), an electrospray ion source (ESI) and the like, the normal pressure ion source is a novel ionization technology which is rapidly developed in recent years and comprises an atmospheric pressure chemical ionization source (APCI), a paper spray ion source (PSI), a low-temperature plasma ion source (LTP) and the like, and the ion source often comprises a complex gas path system, a carrier gas, a peristaltic pump and other matched sample injection modules in the actual application scene, so that the ion source is often limited to the application of a laboratory scene and cannot be effectively adapted to the portable mass spectrum to carry out the on-line direct detection of atmospheric components in the scene such as an industrial production interval and the like, and therefore, the realization of the high-sensitivity portable ion source in the field environment is an industrial problem to be solved.
Disclosure of Invention
Aiming at the problems, the invention provides the vortex gas collecting medium blocking air discharge ion source and the method for detecting the environmental emission substances, which can realize the enrichment of environmental gas, the direct ionization of environmental pollutants and high portability, and expand the application of mass spectrum in the field of real detection in the atmospheric environment.
In order to work of the vortex gas-collecting dielectric barrier air discharge ion source, neutral target molecules in the atmosphere are collected through the vortex gas-collecting sample injection module, and are input into a dielectric barrier discharge area for ionization by utilizing airflow. Comprising the following steps: the vortex gas sampling module is composed of a funnel-shaped sampling port, a vortex tube and a gas circuit adapter; a micro air pump for providing airflow power, sucking the sample in the atmosphere and pushing the sample into the ionization region; the three-way air pipe is arranged at the outlet of the air passage adapter; the quartz tube is arranged at the front end of the three vent pipes; a brass inner electrode inserted into the quartz tube and extending from below the tee; an external electrode wound on the outer wall of the front end of the quartz tube; the power supply module is fixed below the miniature air pump and simultaneously provides high-voltage alternating current of a discharge area and direct current driving of the miniature air pump. The parts are fixed by screws, and the electrodes are connected with a power supply by leads.
A vortex gas collection dielectric barrier air discharge ion source comprising:
a funnel-shaped sample inlet;
a vortex tube connected with the funnel-shaped sample inlet;
the gas circuit adapter is connected with the vortex tube;
the vortex gas sampling module is connected with the gas circuit adapter;
the vortex gas sampling module comprises:
the air pump is connected with the air passage adapter and used for providing airflow power;
a three-way air pipe arranged at the outlet of the air pump;
a quartz tube (i.e., a quartz glass tube) connected to the three-way gas pipe;
an outer electrode and an inner electrode connected with the quartz tube;
and the power supply module is connected with the air pump.
In actual operation, a miniature air pump is utilized to provide a certain pumping force below a vortex tube, so that gas in the environment enters the vortex tube through an upper funnel-shaped sample inlet, the staggered inner wall structure in the tube enables the entering gas flow to generate a vortex flow field, so that the gas flow speed is stabilized and improved, the sample injection and collection efficiency of a target sample is increased, then neutral sample molecules are pushed into a dielectric barrier discharge area under the action of the miniature air pump, the voltage generated by a high-voltage alternating current power supply module is applied to the inner electrode at the center and the outer electrode at the outer wall surface of the quartz tube, low-temperature plasma can be generated through dielectric breakdown air discharge, neutral sample molecules are ionized into positive and negative ions, and then fly out of an ionization area under the pushing action of the gas flow, and the neutral sample molecules enter a rear-end mass spectrum inlet, so that enrichment collection and online ionization of the environmental gas sample are realized.
Further, a sealing O ring is arranged at the joint of the funnel-shaped sample inlet and the vortex tube.
Further, a standby exhaust hole is formed in the air passage connector and used for adjusting the flow speed.
Further, the gas circuit adapter is connected with the air pump through a sample injection gas pipe. The inner electrode needs to extend into the quartz tube but not beyond the foremost opening.
Further, the screw hole is installed to miniature air pump lower extreme, and the fixed power pack of below, integrated circuit board place in the power pack, the side opening is with connecting wire. The power module includes a circuit board and a power source. The outer electrode and the inner electrode are electrically connected with the power supply module.
Further, the micro air pump can adjust the rotating speed through the driving voltage, so that the air flow rate is controlled to increase the collection efficiency. The gas circuit adapter is connected with the air pump through a sample injection gas pipe.
Further, the quartz tube is inserted into one end tube in the three-way air tube and connected with the inner electrode, and one end, far away from the three-way air tube, of the quartz tube is connected with the outer electrode. The outer electrode is mounted on an outer surface of the quartz tube, and the inner electrode is connected into the quartz tube. The outer electrode is a copper foil which is wound on the outer surface of the quartz tube;
the inner electrode is a copper wire, and the copper wire is inserted into the quartz tube.
Further, the method can produce high abundance gas phase nitrate anions NO 3 - The anions are used as primary ions to be directly combined with part of molecules of the to-be-detected object, and are particularly suitable for detecting explosive substances such as nitroaromatic hydrocarbon, nitrate, nitroamine and the like.
Compared with the prior art, the invention has the following advantages:
the invention relates to a vortex gas-collecting dielectric barrier air discharge ion source which mainly comprises a vortex gas-collecting sample injection module and an air dielectric barrier discharge ionization source. The vortex gas collection module comprises a vortex gas collection port, an air pump, a gas circuit interface and a power supply module; the air dielectric barrier discharge technology is also a low-temperature plasma generating device, and the structure comprises a convenient power supply, a high-frequency alternating current module, an electrode and a dielectric medium (quartz glass and the like). Dielectric barrier discharge technology is a non-equilibrium gas discharge ionization source with insulating medium inserted into the discharge space, and is most remarkable in that it can generate stable low-temperature plasma under atmospheric pressure. The ion source has the functions of enrichment and ionization, does not need the provision of extra carrier gas, is small in device and reliable in structure, is suitable for the scene of pollution discharge and on-site detection of atmospheric pollution, has the advantages that the existence of a dielectric layer limits discharge current, avoids forming an electric arc, and has good safety. The device has unique advantages in detection of explosives due to rich nitrogen-oxygen background in the air, and the product of the device can be added with primary nitro ions to form target anions with nitro groups, so that the sensitivity of a test target is improved, and real detection with high sensitivity is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic view of the whole structure after the installation is completed.
Fig. 2 is a schematic diagram of the overall structure of the present invention.
Fig. 3 is a schematic diagram of a sample injection device.
Fig. 4 is a schematic structural diagram of a dielectric barrier discharge region.
FIG. 5 is a schematic diagram of the result of the volatile organic compound test.
FIG. 6 is a graph of explosive RDX, HMX test results.
FIG. 7 is a graph of explosive NG, PETN test results.
The main components in the figure are as follows: 1. a funnel-shaped sample inlet; 2. sealing the O ring; 3. a vortex gas path pipe; 4. the gas path connecting piece; 5. a sample injection air pipe; 6. a nut plug; 7. the air path is three-way; 8. a quartz tube; 9. an external electrode; 10. an inner electrode; 11. a micro air pump; 12. a motor electrode; 13. and a circuit module.
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 obtained by those skilled in the art without making any inventive effort are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "middle", "vertical", "horizontal", and the like indicate orientation or positional relationship based on that shown in the drawings, and are merely for convenience of description of the invention and to simplify the description, and do not indicate or imply that the apparatus or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
As shown in fig. 1, 2 and 3, the present invention includes a micro air pump 11, and a fixed vortex gas collection sampling module on the micro air pump 11. The lower end of the vortex gas collection sample injection module is provided with a gas circuit connecting piece 4 which is connected with a vortex gas circuit pipe 3 above, a funnel-shaped sample injection port 1 is connected with the vortex gas circuit pipe 3 through a sealing O ring 2, a nut plug 6 is connected with the gas circuit connecting piece 4, and the gas circuit connecting piece 4 is connected with a miniature air pump 11 through a sample injection air pipe 5. The discharging device comprises a gas path tee joint 7 arranged at the outlet of a miniature gas pump 11, a quartz tube 8 arranged at the front end of the gas path tee joint 7, an external electrode 9 arranged on the outer surface of the quartz tube 8, and an internal electrode 10 inserted into the quartz tube 8 and extending to the lower part of the tee joint; the circuit module 13 is fixed below the micro air pump 11, and the circuit module 13 (i.e. the power module) is connected with the micro air pump 11 through the motor electrode 12.
The operation steps are as follows: the power supply is switched on, the micro air pump 11 is started, the air flow carries the neutral molecules to be tested to be sucked from the funnel-shaped sample inlet 1, then the air flow is enabled to generate vortex flow fields through staggered inner wall structures in the vortex air channel pipe 3, so that the air flow speed is stabilized and improved, and then the air flow enters the air channel tee joint 7 through the air channel connecting piece 4 and the sample inlet air pipe 5; meanwhile, the circuit module 13 generates high-voltage alternating current to act on the inner electrode 10 in the center and the outer electrode 9 on the outer wall surface of the quartz tube, low-temperature plasma is generated in the quartz tube 8 at the front end of the gas path tee joint 7, ionization electrification of neutral target molecules is initiated, and the neutral target molecules enter the rear end mass spectrum under the pushing of the gas flow.
In order to test that the method is suitable for detecting environmental emissions including various explosives, the method is combined with a linear ion trap mass spectrometer for analysis.
1. Test materials
The compound materials tested included: acetone, chlorobenzene and trichloroethylene are mixed gas steel cylinders; RDX, NMX, NG, PETN, stored in acetonitrile solution at a concentration of 10mM/L when tested, and kept in a refrigerator when not tested.
2. Experimental conditions
During testing, acetone, chlorobenzene and trichloroethylene are directly injected by diluting to 1 ppm; RDX, NMX, NG, PETN the thermal desorption is carried out by using a heating plate which is controlled at 200 ℃ and is used for desolventizing and gasifying the sample.
In experimental operation, the heating plate is arranged at the mouth of the vortex gas collecting device, 2ul of samples are taken by using the pipettor, the heating plate is arranged, the thermal desorption effect is fast desolventized, the samples are gasified and sucked into the vortex gas collecting device, and the flow of the gas is pumped: 1L/min.
Starting the device of the invention, the power supply module provides alternating voltage of the inner electrode and the outer electrode, and Vpp:3kV, frequency: 10kHz, as shown in FIG. 4, produces a light purple discharge in the air gap between the inside of the quartz tube and the inner electrode.
Positive/negative ion detection mode; the scanning mode is positive ion FULL SCAN (FULL SCAN), mass spectrum is open, mass spectrum inlet temperature: 275 degrees celsius; lens voltage: 110V/-120V; ion transport tube voltage: 30V/-30V.
3. Experimental results
As shown in figure 5, the signals of the obvious mass numbers 73, 112 and 129 are respectively detected by detecting the mixed gas of acetone, chlorobenzene and trichloroethylene as the detection result of common VOCs in the atmosphere[M] + The accuracy of the detection can be demonstrated by comparing the background signal with the isotopic abundance of the ions.
In addition, neutral explosives are easily associated with gas phase nitrate anions NO 3 - Under the induction of dielectric barrier discharge, an anionic adduct [ M+NO ] is formed 3 ] - . This avoids the need for inorganic anionic additives, such as NO 3 - 、NO 2 - 、Cl - Acetate and trifluoroacetate salts, simplify the operation to rapidly detect various explosives and increase the sensitivity of the instrument to all explosives tested. The results of the tests for representative explosives, such as those shown in figures 6,7, RDX, HMX, NG, PETN, etc., show that the characteristic ion is an adduct of a characteristic ion binding to the nitric oxide anion, demonstrating the possibility of the method to dissipate explosives in the field monitoring of ambient air.
In summary, the invention provides the vortex gas collecting medium for blocking the air discharge ion source, which has the functions of enrichment and ionization, does not need to provide extra carrier gas, has small and exquisite device and reliable structure, and is suitable for the scene of on-site detection of atmospheric environment emissions, pollution discharge and the like. The device breaks through the difficult problem of gaseous sample treatment, avoids the use of off-line collection devices such as gas collecting bags and the like, and has the advantage of on-line real-time detection. Meanwhile, a large amount of primary precursor ions can be generated by air discharge, and the air discharge is particularly easy to be added with explosives in a negative ion mode, so that the air discharge has unique sensitivity advantages. .
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (10)
1. A vortex gas collection dielectric barrier air discharge ion source comprising:
a funnel-shaped sample inlet;
a vortex tube connected with the funnel-shaped sample inlet;
the gas circuit adapter is connected with the vortex tube;
the vortex gas sampling module is connected with the gas circuit adapter;
the vortex gas sampling module comprises:
the air pump is connected with the air passage adapter and used for providing airflow power;
a three-way air pipe arranged at the outlet of the air pump;
a quartz tube connected with the three-way air tube;
an outer electrode and an inner electrode connected with the quartz tube;
and the power supply module is connected with the air pump.
2. The vortex gas collection dielectric barrier air discharge ion source of claim 1, wherein a sealing O-ring is arranged at the junction of the funnel-shaped sample inlet and the vortex tube.
3. The vortex gas collecting medium blocking air discharge ion source according to claim 1, wherein the gas path connector is provided with a standby exhaust hole for adjusting the flow rate.
4. The vortex gas collection dielectric barrier air discharge ion source of claim 1, wherein the gas circuit adapter is connected with the gas pump through a sample injection gas pipe.
5. The vortex gas collecting medium blocking air discharge ion source according to claim 1, wherein the quartz tube is inserted into one end tube in the three-way gas tube and connected with the inner electrode, and one end of the quartz tube away from the three-way gas tube is connected with the outer electrode.
6. The vortex gas collecting dielectric barrier air discharge ion source of claim 5 wherein the outer electrode is mounted on the outer surface of the quartz tube and the inner electrode is connected into the quartz tube.
7. The vortex gas collecting dielectric barrier air discharge ion source of claim 5 wherein the outer electrode is a copper foil wrapped around the outer surface of the quartz tube;
the inner electrode is a copper wire, and the copper wire is inserted into the quartz tube.
8. The vortex gas collection dielectric barrier air discharge ion source of claim 1 wherein the outer and inner electrodes are electrically connected to the power module.
9. A method for detecting environmental emissions, characterized in that the vortex gas collection dielectric barrier air discharge ion source according to any one of claims 1 to 8 is used in combination with a mass spectrometer for the on-line detection of environmental emissions.
10. The method of detecting an environmental emission material according to claim 9, wherein said environmental emission material is a mixed gas containing nitroaromatic hydrocarbon, nitrate or/and nitroamine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310440168.3A CN116487240A (en) | 2023-04-23 | 2023-04-23 | Vortex gas collecting medium blocking air discharge ion source and environment emission object detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310440168.3A CN116487240A (en) | 2023-04-23 | 2023-04-23 | Vortex gas collecting medium blocking air discharge ion source and environment emission object detection method |
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| CN116487240A true CN116487240A (en) | 2023-07-25 |
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| CN202310440168.3A Pending CN116487240A (en) | 2023-04-23 | 2023-04-23 | Vortex gas collecting medium blocking air discharge ion source and environment emission object detection method |
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