Cigarette smoke online analysis device based on assistance of low-temperature plasma atomized gas

Abstract

The utility model provides a cigarette smoke online analysis device based on assistance of low-temperature plasma atomized gas. The device comprises a coaxial spray needle, a low-temperature plasma generation assembly, a smoke generation assembly for generating cigarette smoke and conveying the cigarette smoke into an inner sleeve, a solution injection assembly for conveying an electrospray reagent into a middle sleeve, and a mass spectrometer, the low-temperature plasma generation assembly comprises a power supply, a voltage regulator, a ballast, an insulating tee joint, a spray point and an atomized gas storage device, one output end of the ballast is wound outside the horizontal section, the other output end of the ballast is connected with one end of the spray point, and the other end of the spray point is arranged in the horizontal section; one end of the horizontal section is communicated with the atomized gas storage device, and the other end of the horizontal section is communicated with the outer sleeve; an outlet of the coaxial spray needle is arranged close to the mass spectrum vacuum interface; and a high-voltage power supply of the mass spectrometer is connected with the outer sleeve. According to the utility model, polar substances, weak polar substances or non-polar substances in smoke can be detected at the same time, the sensitivity is improved, and the detection range is expanded.

Description

Technical Field

[0001] The utility model belongs to the technical field of cigarette smoke mass spectrometry analysis, and in particular relates to a cigarette smoke online analysis device assisted by low-temperature plasma atomization gas. Background Art

[0002] Polycyclic aromatic hydrocarbons (PAHs) present in cigarette smoke are composed of terpenes, phytosterols, waxes, sugars, amino acids and cellulose in tobacco, which are formed by thermal cracking and high-temperature thermal synthesis reactions during cigarette burning or by various primary hydrocarbon free radical reactions. PAHs exist in the particulate matter of smoke and can be intercepted by Cambridge filters. However, due to the complex composition of the particulate matter and the low release of PAHs, which is only a few to a dozen nanograms per cigarette, the number of cigarettes tested in each group should be as large as possible, and after the smoke is captured, PAHs need to be further separated and purified to achieve better detection results. The current mainstream methods for detecting PAHs are high performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS), but these analytical methods all require pre-treatment processes, which are relatively cumbersome and lengthy.

[0003] The applicant disclosed an online mass spectrometry analysis method for cigarette smoke in patent CN202310950845.6, which includes the following steps: using a smoke generation module to continuously absorb smoke from a lit cigarette, and transporting the smoke to the first layer sleeve of a coaxial spray needle, and then spraying it out; using a solution injection module, transporting an electrospray reagent to the second layer sleeve of the coaxial spray needle, and spraying it out, so that the smoke reacts with the electrospray reagent to form a reacted solution; transporting nitrogen in a nitrogen storage device to the third layer sleeve of the coaxial spray needle, and spraying it out, so that the reacted solution forms a micro-droplet spray; using a high-voltage power supply of a mass spectrometer to provide voltage to the third layer sleeve to ionize the micro-droplet spray; the ionized micro-droplet spray enters the mass spectrometer vacuum interface of the mass spectrometer, and the ionized micro-droplet spray is analyzed by the mass spectrometer.

[0004] Although the above analysis method uses electrospray ionization technology, it is only applicable to the analysis of polar substances in cigarette smoke, and it is not easy to analyze and identify weakly polar or non-polar substances in cigarette smoke. Therefore, how to detect polar substances in cigarette smoke while also being able to more easily detect weakly polar or non-polar substances in cigarette smoke, so as to improve the sensitivity of the analysis device and expand the detection range of the analysis device, has become a technical problem that technicians in this field need to solve urgently. Utility Model Content

[0005] The utility model aims to provide an on-line cigarette smoke analysis device assisted by low-temperature plasma atomization gas to solve the above technical problems in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A low-temperature plasma atomized gas-assisted online cigarette smoke analysis device comprises a low-temperature plasma generating component, a smoke generating component, a solution injection component, a coaxial spray needle and a mass spectrometer, wherein the smoke generating component is used to generate cigarette smoke and transport it to the inner sleeve of the coaxial spray needle, and the solution injection component is used to transport the electrospray reagent to the middle sleeve of the coaxial spray needle; the low-temperature plasma generating component comprises a power supply, a voltage regulator, a ballast, an insulating tee, a discharge needle and an atomized gas storage device, wherein the input end of the voltage regulator is connected to the power supply through a wire, the output end of the voltage regulator is connected to the input end of the ballast through a wire, and the ballast One output end of the ballast is wound around the outer circumference of the horizontal section of the insulating tee through enameled wire, the other output end of the ballast is connected to one end of the discharge needle through a wire, and the other end of the discharge needle is arranged in the horizontal section of the insulating tee after passing through the vertical section of the insulating tee; one end of the horizontal section of the insulating tee is connected to the atomizing gas storage device through a first atomizing gas path, and the other end of the horizontal section of the insulating tee is connected to the outer sleeve of the coaxial spray needle through a second atomizing gas path; the outlet of the coaxial spray needle is arranged close to the mass spectrometer vacuum interface of the mass spectrometer, and the high voltage power supply of the mass spectrometer is connected to the outer sleeve through a power line.

[0008] Preferably, the insulating tee is made of high borosilicate glass.

[0009] Preferably, the discharge needle is made of carbon steel or tungsten steel.

[0010] Preferably, the first atomizing gas circuit and the second atomizing gas circuit are both made of polyurethane.

[0011] Preferably, the power supply is a 220V power supply.

[0012] Preferably, the output voltage of the voltage regulator is 0-220V.

[0013] Preferably, the output voltage of the ballast is 0-10 kV.

[0014] Preferably, the atomizing gas stored in the atomizing gas storage device is high-purity helium, and its purity is ≥99.999%.

[0015] Preferably, the axis of the coaxial spray needle coincides with the axis of the mass spectrometer vacuum interface.

[0016] Preferably, the horizontal distance between the outlet end face of the coaxial spray needle and the inlet end face of the mass spectrometer vacuum interface is 5-10 mm.

[0017] The beneficial effects of the utility model are:

[0018] The utility model discloses an on-line analysis device for cigarette smoke assisted by low-temperature plasma atomizing gas. When in use, cigarette smoke is transported into the inner sleeve of a coaxial spray needle and sprayed out from its outlet, and an electrospray reagent is transported into the middle sleeve of the coaxial spray needle and sprayed out from its outlet, so that cigarette smoke reacts with the electrospray reagent to form a sample solution; and a discharge needle of a low-temperature plasma generating assembly is discharged in a horizontal section of an insulating tee to generate low-temperature plasma, so that atomizing gas passing through the horizontal section forms low-temperature plasma atomizing gas under the action of low-temperature plasma, and is transported into the outer sleeve of the coaxial spray needle and then sprayed out from its outlet, so that the sample solution is ionized under the action of the low-temperature plasma atomizing gas to form sample ions; at the same time, because the outer sleeve is also connected to a high-voltage power supply, the sample solution can also be electrosprayed ionized under the action of high voltage electricity to form sample ions, and then these sample ions enter a mass spectrometer through a mass spectrometer vacuum interface, and the mass spectrometer is used to realize real-time on-line analysis of the sample ions. It can be seen that the utility model can not only utilize high voltage electricity to ionize the sample solution by electrospray ionization, so that polar substances in cigarette smoke can be easily detected, but also can utilize low-temperature plasma atomization gas to ionize the sample solution, so that weakly polar or non-polar substances in cigarette smoke can also be easily detected, thus better realizing the combination of low-temperature plasma ionization and electrospray ionization, improving the sensitivity of the cigarette smoke online analysis device, and expanding its detection range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present utility model in detail in conjunction with the drawings, wherein

[0020] Figure 1 A schematic diagram of an on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance provided by an embodiment of the utility model;

[0021] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0022] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0023] Markings in the accompanying drawings:

[0024] 1. Cigarette, 2. Cigarette holder, 3. Peristaltic pump, 4. Silicone hose, 5. First adapter,

[0025] 6. first needle, 7. coaxial spray needle, 71. inner sleeve, 72. middle sleeve,

[0026] 73. Outer casing, 8. Mass spectrometer vacuum interface, 9. Flow injection pump, 10. Syringe,

[0027] 11. PTFE tube, 12. Luer external rotation female connector, 13. Luer external rotation male connector,

[0028] 14. Second needle, 15. Power supply, 16. Voltage regulator, 17. Ballast,

[0029] 18. Insulating tee, 181. Horizontal section, 182. Vertical section, 19. Discharge needle,

[0030] 20. Atomizing gas storage device, 21. First atomizing gas path, 22. Second adapter,

[0031] 23. The third needle, 24. The power cord, 25. The mass spectrometer, 26. The second nebulizer gas line. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the utility model, the solution will be further described in detail below in conjunction with specific embodiments.

[0033] like Figures 1 to 3As shown, the embodiment of the utility model provides an online analysis device for cigarette smoke assisted by low-temperature plasma atomization gas, which includes a low-temperature plasma generating component, a smoke generating component, a solution injection component, a coaxial spray needle 7 and a mass spectrometer 25, wherein the smoke generating component is used to generate cigarette smoke and transport it to the inner sleeve 71 of the coaxial spray needle 7, and the solution injection component is used to transport the electrospray reagent to the middle sleeve 72 of the coaxial spray needle 7; the low-temperature plasma generating component includes a power supply 15, a voltage regulator 16, a ballast 17, an insulating tee 18, a discharge needle 19 and an atomization gas storage device 20, the input end of the voltage regulator 16 is connected to the power supply 15 through a wire, the output end of the voltage regulator 16 is connected to the input end of the ballast 17 through a wire, and the ballast One output end of the ballast 17 is wound on the outer circumference of the horizontal section 181 of the insulating tee through enameled wire, and the other output end of the ballast 17 is connected to one end of the discharge needle 19 through a wire, and the other end of the discharge needle 19, i.e. the discharge end, passes through the vertical section 182 of the insulating tee and is arranged in the horizontal section 181 of the insulating tee; one end of the horizontal section 181 of the insulating tee is connected to the atomizing gas storage device 20 through the first atomizing gas path 21, and the other end of the horizontal section 181 of the insulating tee is connected to the outer sleeve 73 of the coaxial spray needle 7 through the second atomizing gas path 26; the outlet of the coaxial spray needle 7 is arranged close to the mass spectrometer vacuum interface 8 of the mass spectrometer 25, and the high voltage power supply of the mass spectrometer 25 is connected to the outer sleeve 73 through the power line 24.

[0034] The embodiment of the utility model provides an on-line analysis device for cigarette smoke assisted by low-temperature plasma atomization gas. When in use, cigarette smoke is transported to the inner sleeve 71 of the coaxial spray needle 7 and sprayed out from its outlet, and the electrospray reagent is transported to the middle sleeve 72 of the coaxial spray needle 7 and sprayed out from its outlet, so that the cigarette smoke reacts with the electrospray reagent to form a sample solution; and the discharge needle 19 of the low-temperature plasma generating assembly is discharged in the horizontal section 181 of the insulating tee to generate low-temperature plasma, so that the atomized gas passing through the horizontal section Under the action of low-temperature plasma, low-temperature plasma atomized gas is formed, and transported to the outer sleeve 73 of the coaxial needle 7 and then ejected from its outlet, so that the above-mentioned sample solution is ionized under the action of low-temperature plasma atomized gas to form sample ions; at the same time, because the outer sleeve 73 is also connected to a high-voltage power supply, the sample solution can also be electrosprayed under the action of high voltage electricity to form sample ions, and then these sample ions enter the mass spectrometer through the mass spectrometer vacuum interface 8, and the mass spectrometer 25 is used to realize real-time online analysis of the sample ions. It can be seen that the utility model can not only use high voltage electricity to ionize the sample solution in the form of electrospray ionization, so that polar substances in cigarette smoke can be easily detected, but also can use low-temperature plasma atomized gas to ionize the sample solution, so that weak polar or non-polar substances in cigarette smoke can also be easily detected, and the combination of low-temperature plasma ionization and electrospray ionization is well realized, the sensitivity of the cigarette smoke online analysis device is improved, and its detection range is expanded.

[0035] Preferably, the insulating tee 18 is made of high borosilicate glass, the discharge needle 19 is made of carbon steel or tungsten steel, and the first atomizing gas path 21 and the second atomizing gas path 26 are both made of polyurethane.

[0036] In a specific embodiment, the outer diameter of the horizontal section 181 of the insulating tee is 8 mm, the inner diameter of the horizontal section is 5.6 mm, the outer diameter of the vertical section 182 is 6 mm, and the inner diameter of the vertical section is 4 mm; the outer diameter of the first atomizing gas path 21 and the second atomizing gas path 26 are both 12 mm, and the inner diameter is 8 mm; the diameter of the discharge needle is 4 mm and the length is 50 mm.

[0037] Specifically, the power supply 15 is a 220V power supply; the output voltage of the voltage regulator 16 is 0-220V; and the output voltage of the ballast 17 is 0-10kV.

[0038] Preferably, the atomizing gas stored in the atomizing gas storage device 20 is high-purity helium with a purity of ≥99.999%. At this time, its gas pressure can be preferably 0.25 MPa.

[0039] Furthermore, the axis of the coaxial spray needle 7 coincides with the axis of the mass spectrometer vacuum interface 8 , that is, the outlet of the coaxial spray needle is located right in front of the mass spectrometer vacuum interface.

[0040] Preferably, the horizontal distance between the outlet end face of the coaxial spray needle 7 and the inlet end face of the mass spectrometer vacuum interface 8 is 5-10 mm.

[0041] It should be noted that plasma, as the fourth state of matter, has not only been recognized by people, but also plasma technology has entered a wide range of practical applications. Plasma refers to partially or completely ionized gas, and the sum of the positive and negative charges carried by free electrons and ions completely cancels out, presenting neutral charge on a macroscopic scale. Plasma can be divided into low-temperature plasma (LTP for short) and high-temperature plasma (HTP for short) according to its temperature. The temperature of the former is no higher than 104K, while the temperature of the latter can reach 107K or even higher.

[0042] LTP has been widely used in open ion source technology. Compared with electrospray ionization (ESI for short), it has no polarity selection, has higher ionization efficiency, and the generated plasma can better reduce the fragment ions of the analyte. The low-temperature plasma source is a non-surface contact type, normal-pressure open ionization source that utilizes dielectric barrier discharge, that is, a high-frequency alternating current is applied to the insulating medium. When the applied voltage exceeds the Paschen voltage, the inert gas between the insulating medium is broken down and ionized. During the dielectric barrier discharge process, a large number of free radicals, electrons, ions, excited atoms and other metastable particles will be generated. Common insulating media include glass, ceramics, quartz, etc., and commonly used inert gases include helium, argon, and neon. For the LTP jet used in mass spectrometry, helium (chemical formula He) is usually selected as the discharge gas, which can ionize most gases because most molecules (denoted as M) can be excited through the Penning mechanism to form helium metastable He m * ionization:

[0043] He m * +M→He+M ·+ +e - ;

[0044] Since the metastable ions have high energy and are unstable, they collide with N2 and H2O in the atmosphere. When the excitation energy is greater than the ionization energy, charge transfer occurs as follows:

[0045] He m * +N2→He+N2 ·+ +e - ;

[0046] He m *+H2O→He+H2O + +e - ;

[0047] N2 ·+ It can react with water in the environment or sample in a multi-stage gas phase to generate water molecule clusters [(H2O) n+1 H] + Further ionize the analyte. When the proton affinity of H2O and water molecule cluster is less than M, a proton exchange reaction occurs to produce [M+H] + Ions. When combined with a mass spectrometer for detection, the target compound needs to be a gaseous charged ion, so LTP has a high sensitivity to small molecular volatile compounds. The utility model combines low-temperature plasma ionization and electrospray ionization, which can not only improve the sensitivity of the analysis device and expand the detection range of the analysis device, but also effectively reduce the matrix effect of complex cigarette samples, and realize real-time online analysis of weakly polar or non-polar substances in cigarette smoke that are difficult to detect when only electrospray ionization is used.

[0048] Specifically, the smoke generating assembly may include a cigarette holder 2 for clamping a cigarette 1, a peristaltic pump 3, and a silicone hose 4. The silicone hose 4 is arranged in a hose slot of the peristaltic pump 3. One end of the silicone hose is connected to the air outlet of the cigarette holder. The other end of the silicone hose is provided with a first adapter 5. The first adapter is connected to the inner sleeve 71 through a first needle 6. When the peristaltic pump is working, it can continuously absorb the smoke generated by the lit cigarette through the silicone hose, and transport the smoke to the inner sleeve through the first adapter and the first needle.

[0049] Preferably, the rotation speed of the peristaltic pump 3 is 14 rpm, that is, the flow rate of the flue gas in the silicone hose is 35 mL / min, and the inner diameter of the silicone hose is 6.4 mm and the outer diameter is 9.6 mm.

[0050] Specifically, the solution injection assembly may include a flow injection pump 9, a syringe 10 disposed on the flow injection pump, and the liquid outlet of the syringe 10 is connected to the intermediate sleeve 72 through a Luer external rotation female connector 12, a polytetrafluoroethylene tube 11, a Luer external rotation male connector 13, and a second needle 14 that are sequentially connected. With this solution, the flow injection pump can be used to transport the electrospray reagent in the syringe to the intermediate sleeve 72 through the polytetrafluoroethylene tube and the second needle.

[0051] Preferably, the electrospray reagent is chromatographic grade methanol; the specification of the syringe is 10 ml; the working conditions of the flow injection pump are: liquid volume: 10 ml, flow rate: 600 μL / min. The voltage of the high voltage power supply is 1000-5000V.

[0052] Specifically, one end of the second atomizing gas path 26 away from the insulating tee is connected to the outer sleeve 73 of the coaxial needle through the second adapter 22 and the third needle 23 connected in sequence. It can be understood that the inner sleeve 71 is located in the middle sleeve 72, the middle sleeve 72 is located in the outer sleeve 73, and there is a flow channel between the two adjacent sleeves, and the outlet of the coaxial needle is the outlet of each sleeve; it can be preferred that the sleeves are coaxially arranged, and the end faces of the outlet ends of each sleeve are flush, so that the flue gas can be timely contacted with the electrospray reagent and the low-temperature plasma for ionization.

[0053] The general working principle of the on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance provided by the utility model is:

[0054] (a) The smoke generating assembly is used to continuously absorb the smoke from the lit cigarette and transport the smoke to the inner sleeve 71 of the coaxial spray needle 7, and then the smoke is sprayed out from the outlet of the inner sleeve; wherein the cigarette can be equilibrated for 48 hours under the conditions of a temperature of 21°C-23°C and a relative humidity of 58%-62% before being lit;

[0055] (b) using a solution injection assembly to deliver the electrospray reagent into the middle sleeve 72 of the coaxial spray needle 7, and then spraying it out from the outlet of the middle sleeve, so that the flue gas reacts with the electrospray reagent to form a sample solution;

[0056] (c) The atomized gas in the atomized gas storage device 20 is introduced into the first atomized gas path 21, and then the atomized gas flows into the horizontal section 181 of the insulating tee. Since the discharge end of the discharge needle 19 is located in the horizontal section of the insulating tee, when the 220V power supply is continuously supplied, the discharge end of the discharge needle 19 will continue to discharge to generate low-temperature plasma. When the atomized gas passes through the horizontal section 181, the atomized gas forms low-temperature plasma atomized gas under the action of the low-temperature plasma, and then the low-temperature plasma atomized gas is transported to the outer sleeve 73 through the second atomized gas path 26, and is ejected from the outlet of the outer sleeve to contact with the above-mentioned sample solution, so that the sample solution is ionized under the action of the low-temperature plasma to form sample ions;

[0057] (d) turning on the high voltage power supply connected to the outer sleeve 73, so that the sample solution is electrosprayed and ionized under the action of the high voltage to form sample ions;

[0058] (e) The sample ions formed in step (c) and step (d) enter the mass spectrometer 25 through the mass spectrometer vacuum interface 8, and the mass spectrometer 25 is used to perform real-time online analysis of the sample ions.

[0059] Specifically, in step (e), the mass spectrometer can be a LTQ-Orbitrap Velos linear ion trap-electrostatic field orbital trap combined mass spectrometer, whose unique high resolution and multi-stage mass spectrometry detection capabilities can achieve accurate analysis of the chemical components of cigarette smoke. The mass spectrometry measurement conditions are: positive ion detection mode, spray voltage: 3.0kV, capillary temperature: 275°C, S-Lens RF Level: 69%, Microscans: 1, maximum injection time: 50ms, collision gas: high-purity helium with a purity of ≥99.999%. The data acquisition method of the mass spectrometer is: the first-level mass spectrometer adopts Fourier transform high-resolution full scan, the acquisition range: 50-300m / z, and the resolution: 60000.

[0060] Compared with the prior art, the utility model has the following beneficial effects:

[0061] (1) Compared with the traditional analysis device based on electrospray ionization, the utility model is based on electrospray ionization assisted by low-temperature plasma atomization gas. Without making too many changes to the original analysis device based on electrospray ionization, the sensitivity of the analysis device is improved and the detection range of the analysis device is expanded. At the same time, the matrix effect of complex samples is effectively reduced, and the detection of weakly polar or non-polar substances in cigarette smoke that are difficult to detect when only electrospray ionization is used is realized.

[0062] (2) Compared with the conventional analysis device based on plasma ionization, the area where the low-temperature plasma is generated in the utility model does not directly contact the sample solution, thus avoiding the interference of side reactions on the analysis of the sample solution. In addition, the gas environment of the low-temperature plasma atomization gas is relatively stable, and the background signal commonly seen in the low-temperature plasma ionization process will not be introduced.

[0063] (3) Compared with the existing cigarette smoke analysis device, the utility model does not need to perform pre-treatment steps on the cigarette smoke, simplifies the analysis steps of the smoke, and makes the analysis process simple and fast. Moreover, the analysis device is operated at normal pressure and temperature, and the experimental conditions are not strict and relatively easy to implement. In addition, the analysis device is simple to build and install, and each component can be easily installed, disassembled and replaced. It is easy to clean and can be reused to eliminate smoke residues, thereby ensuring the accuracy of online smoke analysis. At the same time, the utility model also realizes real-time online analysis of weakly polar or non-polar compounds in cigarette smoke, avoids smoke aging, and more accurately reflects the true chemical composition of the cigarette smoke inhaled by the smoker during the actual smoking process.

[0064] (4) The mass spectrometer used in the present invention is a LTQ-Orbitrap Velos linear ion trap-electrostatic field orbital trap combined mass spectrometer, which has a unique high resolution and multi-stage mass spectrometry detection capability, and can achieve accurate analysis of the chemical composition of cigarette smoke.

[0065] The above are only preferred implementation modes of the present invention. It should be pointed out that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, after reading the contents of the present invention, relevant technical personnel in the field can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A cigarette smoke online analysis device based on low-temperature plasma atomization gas assistance, characterized in that: The invention comprises a low-temperature plasma generating assembly, a smoke generating assembly, a solution injecting assembly, a coaxial spray needle and a mass spectrometer. The smoke generating assembly is used to generate cigarette smoke and transport it to the inner sleeve of the coaxial spray needle. The solution injecting assembly is used to transport the electrospray reagent to the middle sleeve of the coaxial spray needle. The low-temperature plasma generating assembly comprises a power supply, a voltage regulator, a ballast, an insulating tee, a discharge needle and an atomized gas storage device. The input end of the voltage regulator is connected to the power supply through a wire, the output end of the voltage regulator is connected to the input end of the ballast through a wire, and one output end of the ballast is connected to the electric field through an enameled wire. Winding around the outer circumference of the horizontal section of the insulating tee, the other output end of the ballast is connected to one end of the discharge needle through a wire, and the other end of the discharge needle is arranged in the horizontal section of the insulating tee after passing through the vertical section of the insulating tee; one end of the horizontal section of the insulating tee is connected to the atomizing gas storage device through a first atomizing gas path, and the other end of the horizontal section of the insulating tee is connected to the outer sleeve of the coaxial spray needle through a second atomizing gas path; the outlet of the coaxial spray needle is arranged close to the mass spectrometer vacuum interface of the mass spectrometer, and the high-voltage power supply of the mass spectrometer is connected to the outer sleeve through a power cord.

2. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 1 is characterized in that: The insulating tee is made of high borosilicate glass.

3. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 1 is characterized in that: The material of the discharge needle is carbon steel or tungsten steel.

4. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 1, characterized in that: The first atomizing gas circuit and the second atomizing gas circuit are both made of polyurethane.

5. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 1 is characterized in that: The power supply is a 220V power supply.

6. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 5 is characterized in that: The output voltage of the voltage regulator is 0-220V.

7. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 6 is characterized in that: The output voltage of the ballast is 0-10kV.

8. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 1 is characterized in that: The atomizing gas stored in the atomizing gas storage device is high-purity helium, and its purity is ≥99.999%.

9. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to any one of claims 1 to 8, characterized in that: The axis of the coaxial spray needle coincides with the axis of the mass spectrometer vacuum interface.

10. The on-line cigarette smoke analysis device based on low-temperature plasma atomization gas assistance according to claim 9, characterized in that: The horizontal distance between the outlet end face of the coaxial spray needle and the inlet end face of the mass spectrometer vacuum interface is 5-10 mm.

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