A method and device for quantifying the concentration of active particles entering aerosol

Abstract

The present invention relates to the technical field of plasma bioaerosol inactivation, and in particular to a method and apparatus for quantifying the concentration of active particles entering an aerosol. A method for quantifying the concentration of active particles entering an aerosol, comprising the following steps: selecting a carrier that can undergo a physical and chemical reaction with the active particles based on the composition of the active particles. The carrier is then prepared into an aerosol, so that the active particles can enter the aerosol and undergo a series of physical and chemical reactions with the carrier in the aerosol. In this way, the active particles with a short lifespan are converted into products through physical and chemical reactions, and the product is a chemical substance that can be quantitatively measured. The concentration of the product is measured by a chemical ionization mass spectrometer, and then the concentration of the active particles that enter the aerosol and react with the carrier in the aerosol is reversed through the chemical reaction formula in the conversion process, thereby quantifying the concentration of the active particles entering the aerosol.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma bioaerosol inactivation, and in particular to a method and device for quantifying the concentration of active particles entering aerosol. Background Art

[0002] Coronaviruses are a class of viruses that are enveloped and have linear, single-stranded, positive-sense genomes. They are a widespread class of viruses in nature. Studies have shown that pathogens such as coronaviruses can form bioaerosols and spread through the air, but ventilation or fresh air systems alone are difficult to reduce the risk of bioaerosol transmission. Bioaerosol inactivation technologies can effectively prevent the spread of pathogens such as coronaviruses through the air. Atmospheric pressure low-temperature plasma technology, due to its high efficiency and environmental friendliness, has been a very active research area in recent years. However, the key to understanding the mechanism of low-temperature plasma bioaerosol inactivation is how to quantify the concentration of active particles that enter and react with the aerosol during the aerosol plasma discharge process.

[0003] During the bioaerosol inactivation process, active particles in the plasma must enter the aerosol to be effective. Existing techniques for plasma bioaerosol inactivation primarily measure the emission spectrum of active particles surrounding the aerosol. While this spectrum correlates somewhat with active particles that have entered and reacted with the aerosol, it cannot quantify the concentration of these particles. Summary of the Invention

[0004] In order to solve the technical problem in the prior art that the concentration of active particles entering into the aerosol cannot be quantified, the present invention provides a method and apparatus for quantifying the concentration of active particles entering into the aerosol.

[0005] The present invention is implemented by the following technical solution: a method for quantifying the concentration of active particles entering an aerosol, comprising the following steps:

[0006] S1: A variety of active species are generated in the reaction chamber through high-voltage discharge of a plasma discharge device.

[0007] S2: Select a carrier that can react with the active particles according to the composition of the active particles that need to be quantified in the reaction chamber, and prepare the carrier into an aerosol that allows the active particles to enter the aerosol.

[0008] S3: Introducing the aerosol into the reaction chamber of the plasma discharge device, the particle size of the aerosol entering the reaction chamber is in the micron or submicron order, so that all the active particles that need to be quantified in the reaction chamber can enter the aerosol and react chemically with the carrier in the aerosol to generate intermediate 1, and intermediate 1 generates products under the action of oxygen and water in the reaction chamber.

[0009] S4: The generated product is vaporized and introduced into a chemical ionization mass spectrometer for measurement, and the concentration of the active particles introduced into the aerosol is inferred by measuring the concentration of the product.

[0010] As a further improvement of the present invention, the aerosol in step S2 is SO2 aerosol, and the concentration of SO2 in the SO2 aerosol is C, 5%≥C≥0.1%.

[0011] As a further improvement of the present invention, the plurality of active particles include a mixture of any one or more of free radical active particles, excited state active particles or electronic active particles.

[0012] As a further improvement of the present invention, the particle size of the aerosol introduced into the plasma discharge device is adjusted as follows: nitrogen is added to the prepared aerosol to dilute it, the flow rate of the aerosol generated in the aerosol generator is adjusted, and the particle size distribution in the aerosol is controlled using a scanning mobility particle size spectrometer so that the particle size of the aerosol entering the plasma discharge device is on the micron or submicron level.

[0013] A device for quantifying the concentration of active particles entering an aerosol, comprising an aerosol generator, a plasma discharge device, a vaporization device, and a chemical ionization mass spectrometer. The plasma discharge device is provided with a reaction chamber, and the plasma discharge device generates a plurality of active particles in the reaction chamber through high-voltage discharge. The two ends of the reaction chamber are respectively connected to the aerosol generator and the vaporization device. The aerosol generator is used to prepare an aerosol from a carrier that can react with the active particles to be quantified in the reaction chamber, and to transport the aerosol into the reaction chamber. The product generated in the reaction chamber enters the vaporization device for vaporization. The chemical ionization mass spectrometer is connected to the other end of the vaporization device and is used to measure the concentration of the vaporized product.

[0014] As a further improvement of the present invention, the aerosol generating device includes a solution preparation device of a carrier that can react with the active particles that need to be quantified in the reaction chamber, an aerosol generator and a scanning mobility particle size spectrometer, and the two ends of the aerosol generator are respectively connected to the solution preparation device and the scanning mobility particle size spectrometer; the solution preparation device is used to prepare the carrier solution and transport the prepared carrier solution to the aerosol generator, the aerosol generator is used to prepare the prepared carrier solution into an aerosol, and transport the prepared aerosol to the scanning mobility particle size spectrometer, the scanning mobility particle size spectrometer is used to select the particle size of the prepared aerosol, and transport the aerosol with a particle size of the micron or submicron order to the reaction chamber.

[0015] As a further improvement of the present invention, the aerosol generator further includes an electronic injection pump and a sprayer. The electronic injection pump is used to deliver the carrier solution prepared by the solution preparation device to the sprayer, and the sprayer prepares the carrier solution into an aerosol by spraying.

[0016] As a further improvement of the present invention, the aerosol generating device and the plasma discharge device are connected via a pipe 1, and the diameter of the pipe 1 is 2 mm-6 mm.

[0017] As a further improvement of the present invention, pipeline 1 is a PFA pipeline.

[0018] As a further improvement of the present invention, the vaporization device is a stainless steel pipeline.

[0019] The technical solution provided by the present invention has the following beneficial effects:

[0020] (1) The present invention provides a method for quantifying the concentration of active particles entering an aerosol. The aerosol is introduced into a reaction chamber in a dielectric barrier discharge device, so that the active particles generated during the discharge process of the dielectric barrier discharge device can enter the aerosol and undergo a series of physical and chemical reactions with the carrier in the aerosol. The short-lived active particles are converted into products through the physical and chemical reactions. The product is a chemical substance that can be quantitatively measured. The concentration of the product is measured by a chemical ionization mass spectrometer. The concentration of the active particles that enter the aerosol and react with the carrier in the aerosol is then reversely pushed forward by the chemical reaction formula in the conversion process, thereby quantifying the concentration of the active particles that enter the aerosol. In existing bioaerosol inactivation technologies, the key role in biological inactivation is played by the active particles that enter the aerosol and react with substances in the aerosol. These active particles usually do not emit light and the lifetime of some particles is very short. Therefore, the conventional emission spectroscopy method cannot directly measure the concentration of active particles. In this embodiment, a carrier that can chemically react with the active particles to be quantified is used to prepare an aerosol, and the prepared aerosol is introduced into the dielectric barrier discharge region as a sensor, so that the active particles to be quantified can enter the aerosol and react with the carrier in the aerosol to generate products. By detecting the concentration of the products of this chemical reaction, the concentration of the active particles that have entered the aerosol and participated in the reaction is quantified, thereby achieving accurate and effective measurement of the concentration of some non-luminous and short-lived active particles.

[0021] (2) The present invention provides a method for quantifying the concentration of active particles entering an aerosol. The carrier can be a substance with a calibrated particle size, concentration, and number density. The substance is configured into a solution and the configured solution is made into an aerosol through an aerosol generator. The concentration of the product of the reaction between the active particles and the carrier in the aerosol is measured, thereby quantifying the concentration of the active particles that enter the aerosol and react.

[0022] (3) The present invention provides a method for quantifying the concentration of active particles entering an aerosol. The method controls the particle size of the aerosol entering the reaction chamber to be in the micrometer or submicrometer order. The purpose is that the micrometer or submicrometer order aerosol has a penetration depth comparable to that of short-lived active particles in the plasma, so that all active particles to be quantified in the reaction chamber can enter the aerosol and chemically react with the carrier in the aerosol to generate an intermediate 1, which generates a product under the action of oxygen and water in the reaction chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the reaction principle between SO2 and active particles in the plasma discharge region in a method for quantifying the concentration of active particles entering aerosol provided by the present invention.

[0024] Figure 2 A schematic diagram of the reaction principle of SO2 in the DBD discharge zone with the active particles in the discharge zone in a method for quantifying the concentration of active particles entering the aerosol provided by the invention.

[0025] Figure 3 A schematic diagram of the structure of a device for quantifying the concentration of active particles entering aerosol provided by the present invention.

[0026] Figure 4 This is a schematic structural diagram of a solution preparation device in a device for quantifying the concentration of active particles entering an aerosol provided by the present invention.

[0027] Figure 5 This is a schematic structural diagram of the connection between a plasma discharge device and a vaporization device in an apparatus for quantifying the concentration of active particles entering an aerosol provided by the present invention.

[0028] The markings in the figure are: 1. Aerosol generating device; 11. Solution preparation device; 12. Aerosol generator; 13. Scanning mobility particle size spectrometer; 2. Plasma discharge device; 3. Vaporization device; 4. Chemical ionization mass spectrometry device; 5. Pipeline 1. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of the present invention, it should be noted that for directional words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and should not be understood as limiting the specific scope of protection of the present invention. The terms "first", "second", etc. in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "including" and "having" and any variations thereof in the description and claims of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0031] In existing bioaerosol inactivation technologies, the key to biological inactivation is the active particles that enter the aerosol and react with substances in the aerosol. These active particles usually do not emit light, and some particles have a very short lifespan. Therefore, existing emission spectroscopy methods cannot directly measure the concentration of active particles that enter the aerosol and react with substances in the aerosol.

[0032] In this embodiment, a carrier capable of undergoing a physicochemical reaction with the active particles is selected based on the composition of the active particles, and the carrier is then prepared into an aerosol, so that the active particles can enter the aerosol and undergo a series of physicochemical reactions with the carrier in the aerosol. As a result, the short-lived active particles are converted into products through physicochemical reactions, and the product is a chemical substance that can be quantitatively measured. The concentration of the product is measured by the chemical ionization mass spectrometry device 4, and then the concentration of the active particles that enter the aerosol and react with the carrier in the aerosol is reversely promoted through the chemical reaction formula in the conversion process, thereby quantifying the concentration of the active particles entering the aerosol.

[0033] The specific quantification method is as follows:

[0034] A method for quantifying the concentration of reactive particles entering an aerosol comprises the following steps:

[0035] S1: A plasma discharge device 2 generates a variety of active species in its reaction chamber through high-voltage discharge. In this step, the plasma discharge device 2 can be a dielectric barrier discharge device. During the discharge process, the plasma discharge device 2 generates a variety of active species. These active species may include a mixture of one or more of free radical active species, excited state active species, or electronic active species. Examples include plasma active species such as OH, O, and NO. These plasma active species can be used in the bioaerosol inactivation process.

[0036] S2: Select a carrier that can react with the active particles according to the composition of the active particles that need to be quantified in the reaction chamber, and prepare the carrier into an aerosol that allows the active particles to enter the aerosol.

[0037] S3: Introducing the aerosol into the reaction chamber of the plasma discharge device 2, wherein the aerosol entering the reaction chamber has a particle size of the micron or submicron order. In this embodiment, the purpose of controlling the particle size of the aerosol entering the reaction chamber to be micron or submicron order is to ensure that the micron or submicron aerosol has a penetration depth comparable to that of short-lived active particles in the plasma, thereby allowing all active particles to be quantified in the reaction chamber to enter the aerosol and chemically react with the carrier in the aerosol to form an intermediate 1. The intermediate 1 then generates a product under the action of oxygen and water in the reaction chamber.

[0038] S4: The generated product is vaporized and introduced into the chemical ionization mass spectrometer 4 for measurement, and the concentration of the active particles introduced into the aerosol is inversely estimated by measuring the concentration of the product.

[0039] The quantization method of this embodiment has the following advantages:

[0040] 1. In existing bioaerosol inactivation technologies, the key to bioinactivation lies in the active particles that enter the aerosol and react with substances in the aerosol. These active particles are typically non-luminescent, and some have very short lifetimes. Therefore, conventional emission spectroscopy cannot directly measure their concentration. However, in this embodiment, an aerosol is prepared using a carrier that can chemically react with the active particles to be quantified. This prepared aerosol is then introduced into a dielectric barrier discharge region as a sensor, allowing the active particles to enter the aerosol and react with the carrier in the aerosol to produce products. By detecting the concentration of the products of this chemical reaction, the concentration of the active particles that have entered the aerosol and participated in the reaction is quantified, enabling accurate and effective concentration measurement of some non-luminescent and short-lived active particles.

[0041] Second, in this embodiment, the carrier can be a substance with a calibrated particle size, concentration, and number density. By configuring the substance into a solution and using the aerosol generator 12 to make the configured solution into an aerosol, the concentration of the active particles that enter the aerosol and react are quantified by measuring the concentration of the product of the reaction between the active particles and the carrier in the aerosol.

[0042] Therefore, in this embodiment, by introducing the aerosol into the reaction chamber of the dielectric barrier discharge device, the active particles generated in the dielectric barrier discharge device can enter the aerosol and undergo a series of physical and chemical reactions with the carriers in the aerosol. As a result, the short-lived active particles are converted into products through the physical and chemical reactions. The product is a chemical substance that can be quantitatively measured. The concentration of the product is measured by the chemical ionization mass spectrometer 4, and the concentration of the active particles that enter the aerosol and react with the carriers in the aerosol is then reversely promoted through the chemical reaction formula during the conversion process, thereby quantifying the concentration of the active particles entering the aerosol.

[0043] In this embodiment, the aerosol in step S2 can be SO2 aerosol. The purpose of selecting SO2 aerosol is that there have been many studies in the field of chemistry between SO2 aerosol and active particles, and there are sufficient experimental data on its physical parameters such as reaction mechanism and reaction rate. Among them, the reaction principle between SO2 and active particles in the plasma discharge region can be referred to Figure 1 and Figure 2As shown. The reaction between active particles and aerosol particles in the discharge area is mainly the reaction between active particles and SO2 molecules and water molecules in the aerosol. The reaction mechanism and mass transfer process of active particles and water are studied in depth and detail. At the same time, it is necessary to consider that the particle size of the aerosol is in the micron or submicron order, which is comparable to the penetration depth of many active particles, thereby enabling the active particles to quickly enter the aerosol. Figure 1 and Figure 2 The reaction process of active particles generated by discharge and SO2 aerosol can be concluded that H2SO4 generated by the reaction of active particles can be obtained by Figure 1 and Figure 2 The theoretical research gives.

[0044] In addition, SO2 has high solubility in water. It enters the plasma discharge region as a sensor. The concentration of SO2 volatilized into the plasma discharge region is low, which has little interference with the plasma discharge region and is conducive to the measurement of active particles generated in the plasma discharge region.

[0045] In this embodiment, the concentration C of SO2 in the SO2 aerosol can be in the range of 5% ≥ C ≥ 0.1%. The reason for limiting the SO2 concentration is that in order to meet the principle of accurate measurement of active particles such as OH radicals, it is beneficial to increase the concentration of SO2 in the aerosol. Although SO2 is soluble in water and has a relatively small Henry's constant, an excessively high SO2 concentration in the aerosol will interfere with the experimental results, mainly because the aerosol has a large surface area ratio. According to Henry's law, SO2 in the aerosol diffuses into the gas in the plasma discharge region, changing the composition of the discharge gas and interfering with the measurement results. Therefore, in order to avoid interference with the discharge gas, the concentration of SO2 in the aerosol needs to be reduced. Therefore, in this embodiment, by limiting the concentration of SO2, it is possible to balance the above two contradictions and achieve the purpose of accurately measuring active particles in the plasma discharge region.

[0046] In this embodiment, the particle size of the prepared aerosol is adjusted before it is introduced into the discharge region of the dielectric barrier discharge device. The adjustment method is as follows: nitrogen is added to the prepared aerosol to dilute it, the flow rate of the aerosol generated by the aerosol generator 12 is adjusted, and the particle size distribution of the aerosol is controlled using a scanning mobility particle size spectrometer 13. This ensures that the particle size of the aerosol entering the discharge region of the dielectric barrier discharge device is on the micron or submicron scale. This method ensures that the particle size of the aerosol entering the discharge region of the dielectric barrier discharge device is on the micron or submicron scale, thereby allowing the active particles generated in the discharge region of the dielectric barrier discharge device, which are capable of reacting with carriers in the aerosol, to quickly enter the aerosol and react with the carriers in the aerosol. This allows some active particles with shorter lifespans to quickly enter the aerosol, thereby improving measurement accuracy.

[0047] Next, we take OH radicals as an example to provide the conditions required for measuring active particle concentration and demonstrate that the method of this embodiment can quantify the concentration of active particles. When OH radicals enter the aerosol, they react as follows:

[0048] OH+SO2+M—→HSO3+M (1)

[0049] HSO3+O2→SO3+HO2 (fast) (2)

[0050] SO3+H2O+M→H2SO4+M (fast) (3)

[0051] Wherein, M is a neutral molecule generated in the discharge region of the dielectric barrier discharge device.

[0052] For reactions (1), (2) and (3), when the concentrations of H2O, O2, SO2 and neutral molecules M are much greater than the concentration of OH radicals, the changes in their concentrations before and after reactions (1), (2) and (3) can be ignored, so:

[0053]

[0054] Where t is the time it takes for active particles entering the aerosol to react with SO2. Since the lifetime of OH radicals is approximately nanoseconds, the integral time t is at most nanoseconds, making it difficult to detect directly. However, the integral term reflects the total amount of all free radicals that can react with SO2. And since reactions (2) and (3) are very fast, we have:

[0055] [H2SO4]=[HSO3] (5)

[0056] From the above analysis, it can be seen that only when the amount of neutral reactants such as H2O and SO2 is sufficient and their concentrations are negligible before and after the reaction will the OH radical concentration be directly proportional to the H2SO4 concentration detected by the chemical ionization mass spectrometer, with a ratio of 1:1. Under the experimental conditions set in this example, the H2O concentration can easily be much greater than the radical concentration, because the SO2 concentration cannot be too low when configuring. This is why the SO2 concentration is required to meet this condition.

[0057] The above analysis of OH radicals demonstrates that the quantification method of this embodiment can effectively quantify the concentration of active particles entering the aerosol. In practical applications, this quantification method can be used to clarify the inactivation mechanism of plasma bioaerosols, provide universal and effective plasma bioaerosol inactivation parameters, and provide a reference for controlling harmful byproducts.

[0058] This example uses an aerosol generated by atomizing a water solution containing SO₂ as a sensor, which is then introduced into the plasma discharge region of a dielectric barrier discharge device. Since SO₂ in the aerosol is physically dissolved and primarily exists in a molecular state, and the reaction between SO₂ aerosol and reactive species has been extensively studied in atmospheric chemistry, this example explores the spatiotemporal evolution of reactive species by analyzing the reaction mechanism and kinetics of reactive species with SO₂ aerosol. Combined with plasma discharge reaction parameters, this allows the screening of key reactive species that enter the SO₂ aerosol and participate in the reaction. The concentration of the product H₂SO₄ can then be used to infer the concentration of reactive species that enter the SO₂ aerosol and react with substances therein. This allows the concentration of reactive species that enter the aerosol and participate in the reaction to be quantified.

[0059] Furthermore, this embodiment also designs a device based on the aforementioned quantification method. This device is used to perform the aforementioned method for quantifying the concentration of active particles entering aerosols. This device enables experimental operation of a method for quantifying the concentration of active particles entering aerosols. The device is described below:

[0060] A device that quantifies the concentration of active particles entering the aerosol, see Figure 3As shown, the method quantifies the concentration of active particles entering the aerosol. This method quantifies the active particles generated by a plasma discharge device 2 during high-voltage discharge. The method comprises an aerosol generator 1, a plasma discharge device 2, a vaporizer 3, and a chemical ionization mass spectrometer 4. The plasma discharge device 2 is provided with a reaction chamber, and the plasma discharge device 2 generates a variety of active particles in the reaction chamber through high-voltage discharge. The two ends of the reaction chamber are connected to the aerosol generator 1 and the vaporizer 3, respectively. The aerosol generator 1 is used to prepare an aerosol from a carrier that can react with the active particles to be quantified in the reaction chamber, and then transport the aerosol into the reaction chamber. The products generated in the reaction chamber enter the vaporizer 3 for vaporization. The chemical ionization mass spectrometer 4 is connected to the other end of the vaporizer 3 and is used to measure the concentration of the vaporized products.

[0061] In this embodiment, the materials used in the aerosol generating device 1 are mainly glass and sulfuric acid-resistant Teflon material.

[0062] The aerosol generating device 1 includes a solution preparation device 11, an aerosol generator 12 and a scanning mobility particle size spectrometer 13. The solution preparation device 11 is used to prepare a solution that can react with the active particles that need to be quantified. In this embodiment, the SO2 solution can be prepared by the solution preparation device 11. One end of the aerosol generator 12 is connected to the solution preparation device 11 through a pipeline, and the other end of the aerosol generator 12 is connected to the scanning mobility particle size spectrometer 13 through a pipeline. The aerosol is used to form an aerosol by spraying the prepared solution and transporting the formed aerosol to the scanning mobility particle size spectrometer 13. The other end of the scanning mobility particle size spectrometer 13 is connected to the plasma discharge device 2, and the scanning mobility particle size spectrometer 13 is used to screen the particle size of the incoming aerosol so that the aerosol particles with a size of micron or submicron enter the plasma discharge device 2. By setting up the scanning mobility particle size spectrometer 13, the particle size of the aerosol can be regulated and screened so that the particle size of the aerosol entering the plasma discharge device 2 is in the micron or submicron order, thereby accelerating the speed at which the active particles generated in the plasma discharge device 2 enter the aerosol, preventing some short-lived active particles from not having enough time to enter the aerosol, and allowing more active particles whose concentration needs to be measured to enter the aerosol, thereby improving the accuracy of the entire quantification of the active particle concentration.

[0063] The aerosol generating device 1 and the plasma discharge device 2 are connected via a pipe 5, the diameter of which is 2 mm to 6 mm. The pipe 5 is a PFA pipe.

[0064] It is understood that when the solution preparation device 11 of this embodiment is used to prepare an aqueous solution of SO2, Henry's law can be used to prepare aqueous solutions of SO2 with different concentrations. Figure 4 The preparation process can be as follows: SO2 standard gas is introduced into water through a sand filter plate to generate small bubbles. As the bubbles rise, the SO2 in the gas diffuses into the water, causing the SO2 concentration at the outlet to decrease. After a period of time, the SO2 in the gas and water reach equilibrium. At this point, the SO2 concentration at the outlet matches the concentration at the inlet, and the SO2 concentration in the surface water has reached gas-liquid equilibrium. The SO2 aqueous solution that has reached gas-liquid equilibrium can be diluted with deionized water at the same temperature to prepare an aqueous SO2 solution of a desired concentration.

[0065] The aerosol generator 12 also includes an electronic syringe pump and a sprayer. The electronic syringe pump is used to transport the solution prepared by the solution preparation device 11 to the sprayer. The sprayer converts the carrier solution into an aerosol by spraying. This achieves the conversion of the carrier solution into an aerosol. In this embodiment, the carrier solution can be an SO2 solution.

[0066] The aerosol particle size can be adjusted in the aerosol generator 1 by: first, nitrogen is added to dilute the aerosol, the flow rate of the atomizing gas in the nebulizer is adjusted, and the particle size distribution of the aerosol is adjusted using the scanning mobility spectrometer 13. When the aerosol particle size reaches the set value, the scanning mobility spectrometer 13 is disconnected, and the generated aerosol is directly introduced into the discharge zone of the plasma discharge device 2 for discharge analysis.

[0067] It is understood that the plasma discharge device 2 in this embodiment can be a pulsed DBD plasma discharge device 2. In previous studies, it was found that the coaxial DBD plasma discharge device 2 has good practicality in gas analysis and monitoring. Therefore, the coaxial DBD plasma discharge device 2 can be selected in this embodiment. The cross-sectional view of its structure is shown in FIG. Figure 5As shown. The high-voltage electrode (inner electrode) is a copper circular tube with an outer diameter of 6 mm and an inner diameter of 4 mm. It is solid in the middle and hollow at both ends. There are holes in the tube to allow aerosol to enter the quartz glass tube. The medium can be a quartz glass tube, which can be a circular structure with an inner diameter of 10 mm and a tube wall of 2 mm. The outer wall uses a stainless steel mesh as the outer electrode. The coaxial DBD plasma discharge device 2 is powered by a high-voltage AC power supply, and the discharge parameters such as discharge frequency, voltage and current are measured by a digital oscilloscope. To facilitate the observation of the discharge morphology and reduce interference with the spectral diagnosis, a circle of observation ports is set on the polytetrafluoroethylene at one end of the coaxial DBD plasma discharge device 2 to align with the position of the discharge gap, and a grating spectrometer is used to perform spectral diagnosis of the discharge area. The aerosol enters the reaction chamber through the gas inlet and reacts with the active particles in the plasma in the reaction chamber. By adjusting the flow rate of the gas flowing through the reaction chamber and based on the cross-sectional area of ​​the reaction chamber, the aerosol plasma reaction time, power density and other parameters are calculated.

[0068] The vaporization device 3 can be a stainless steel pipe, which can be heated to 120° C. by a heating tape. Its diameter can be 6 mm.

[0069] The above describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for quantifying the concentration of active particles entering an aerosol, characterized in that It includes the following steps: S1: generating a variety of active particles in its reaction chamber through high voltage discharge of a plasma discharge device (2); S2: selecting a carrier capable of reacting with the active particles according to the composition of the active particles to be quantified in the reaction chamber, and preparing the carrier into an aerosol capable of allowing the active particles to enter the aerosol; S3: introducing the aerosol into the reaction chamber of the plasma discharge device (2), wherein the particle size of the aerosol entering the reaction chamber is in the micrometer or submicrometer order, so that all active particles to be quantified in the reaction chamber can enter the aerosol and react chemically with the carrier in the aerosol to generate an intermediate 1, and the intermediate 1 generates a product under the action of oxygen and water in the reaction chamber; S4: The generated product is vaporized and introduced into a chemical ionization mass spectrometer (4) for measurement, and the concentration of the active particles introduced into the aerosol is inversely calculated by measuring the concentration of the product.

2. The method for quantifying the concentration of active particles entering the aerosol according to claim 1, characterized in that The aerosol in step S2 is SO2 aerosol, and the concentration of SO2 in the SO2 aerosol is C, 5%≥C≥0.1%.

3. The method for quantifying the concentration of active particles entering the aerosol according to claim 1, wherein: The plurality of active species include a mixture of any one or more of free radical active species, excited state active species or electronic active species.

4. The method for quantifying the concentration of active particles entering an aerosol as claimed in claim 1, wherein: The particle size of the aerosol introduced into the plasma discharge device (2) is adjusted as follows: nitrogen is added to the prepared aerosol to dilute it, the flow rate of the aerosol generated in the aerosol generator (12) is adjusted, and the particle size distribution in the aerosol is controlled by using a scanning mobility particle size spectrometer (13) so that the particle size of the aerosol entering the plasma discharge device is in the micrometer or submicrometer order.

5. A device for quantifying the concentration of active particles entering an aerosol, characterized in that The method quantifies the active particles generated by a plasma discharge device (2) during high-voltage discharge by using the method for quantifying the concentration of active particles entering an aerosol as described in any one of claims 1 to 4; the method comprises an aerosol generating device (1), a plasma discharge device (2), a vaporization device (3) and a chemical ionization mass spectrometry device (4); the plasma discharge device (2) is provided with a reaction chamber, and the plasma discharge device (2) generates a plurality of active particles in the reaction chamber by high-voltage discharge; the two ends of the reaction chamber are respectively connected to the aerosol generating device (1) and the vaporization device (3); the aerosol generating device (1) is used to prepare an aerosol from a carrier that can react with the active particles to be quantified in the reaction chamber, and to transport the aerosol into the reaction chamber; the product generated in the reaction chamber enters the vaporization device (3) for vaporization; the chemical ionization mass spectrometry device (4) is connected to the other end of the vaporization device (3) and is used to measure the concentration of the vaporized product.

6. The device for quantifying the concentration of active particles entering an aerosol according to claim 5, characterized in that The aerosol generating device (1) comprises a solution preparation device (11) of a carrier capable of reacting with active particles to be quantified in the reaction chamber, an aerosol generator (12), and a scanning mobility particle size spectrometer (13), wherein both ends of the aerosol generator (12) are respectively connected to the solution preparation device (11) and the scanning mobility particle size spectrometer (13); the solution preparation device (11) is used to prepare a carrier solution and transport the prepared carrier solution to the aerosol generator (12); the aerosol generator (12) is used to prepare the prepared carrier solution into an aerosol and transport the prepared aerosol to the scanning mobility particle size spectrometer (13); the scanning mobility particle size spectrometer is used to select the particle size of the prepared aerosol and transport the aerosol with a particle size of the micron level or the submicron level to the reaction chamber.

7. The device for quantifying the concentration of active particles entering an aerosol according to claim 6, characterized in that The aerosol generator (12) further comprises an electronic injection pump and a sprayer. The electronic injection pump is used to deliver the carrier solution prepared by the solution preparation device (11) to the sprayer. The sprayer prepares the carrier solution into an aerosol by spraying.

8. The device for quantifying the concentration of active particles entering an aerosol according to claim 5, characterized in that The aerosol generating device (1) and the plasma discharge device (2) are connected via a pipe (5), and the diameter of the pipe (5) is 2 mm to 6 mm.

9. The device for quantifying the concentration of active particles entering an aerosol according to claim 8, characterized in that The pipe one (5) is a PFA pipe.

10. The device for quantifying the concentration of active particles entering an aerosol according to claim 5, characterized in that The vaporization device (3) is a stainless steel pipeline.

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