Method and equipment for quantifying concentration of active particles entering aerosol

Abstract

The invention relates to the technical field of plasma biological aerosol inactivation, in particular to a method and equipment for quantifying the concentration of active particles entering aerosol. A method of quantifying the concentration of active particles into an aerosol comprises the step of selecting a carrier capable of physically and chemically reacting with the active particles by the composition of the active particles. And then the carrier is prepared into aerosol, so that the active particles can enter the aerosol and have a series of physical and chemical reactions with the carrier in the aerosol. In this way, the active particles with short service life are converted into a product through a physical-chemical reaction, and the product is a chemical substance which can be quantitatively measured. The concentration of the product is measured through a chemical ionization mass spectrometry device, and then the concentration of active particles which are reversely propelled into the aerosol and react with a carrier in the aerosol is measured through a chemical reaction formula in the conversion process, so that the concentration of the active particles entering the aerosol is quantified.

Description

Technical Field

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

[0002] The viruses to which the coronavirus belongs are enveloped RNA viruses with linear single-stranded positive genomes. They are a large class of viruses that are widely present in nature. Studies have found that pathogens such as coronaviruses can form bioaerosols and spread through the air, and it is difficult to reduce the risk of bioaerosol transmission by ventilation or fresh air systems alone. Bioaerosol inactivation technology can effectively prevent pathogens such as coronaviruses from spreading through the air. Among them, atmospheric pressure low-temperature plasma technology has been a very active research field in recent years due to its high efficiency and environmental friendliness. However, the key to restricting the inactivation mechanism of low-temperature plasma bioaerosols is how to quantify the concentration of active particles that enter the aerosol and react with the aerosol during the aerosol plasma discharge process.

[0003] In the process of bioaerosol inactivation, the active particles in the plasma must enter the aerosol to play an effective role. In the prior art, in the process of plasma bioaerosol inactivation research, the emission spectrum mainly measures the emission spectrum of the active particles around the aerosol, and there is a certain correlation between the active particles that enter the aerosol and react with the aerosol, but it is also unable to quantify the concentration of the active particles that enter the aerosol and react with the aerosol. Summary of the invention

[0004] In order to solve the technical problem in the prior art that the concentration of active particles entering into an aerosol cannot be quantified, the present invention provides a method and a device for quantifying the concentration of active particles entering into an 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 inversely estimated 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: by adding nitrogen to the prepared aerosol to dilute it, and adjusting the flow rate of the aerosol generated in the aerosol generator, and then using a scanning mobility particle size spectrometer to regulate the particle size distribution in the aerosol, so that the particle size of the aerosol entering the plasma discharge device is in the micron or submicron order.

[0013] A device for quantifying the concentration of active particles entering an aerosol, comprising an aerosol generator, a plasma discharge device, a vaporizer, and a chemical ionization mass spectrometer. The plasma discharge device is provided with a reaction chamber, and the plasma discharge device generates a variety of active particles in the reaction chamber by high-voltage discharge. The two ends of the reaction chamber are respectively connected to the aerosol generator and the vaporizer. The aerosol generator is used to prepare a carrier that can react with the active particles to be quantified in the reaction chamber into an aerosol, and transport the aerosol into the reaction chamber. The product generated in the reaction chamber enters the vaporizer for vaporization. The chemical ionization mass spectrometer is connected to the other end of the vaporizer, 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 active particles that need to be quantified in the reaction chamber, an aerosol generator, and a scanning mobility particle size spectrometer. 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 a carrier solution, and to transport the prepared carrier solution to the aerosol generator; the aerosol generator is used to prepare the prepared carrier solution into an aerosol, and to 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 to transport the aerosol with a particle size of the micron level or the submicron level to the reaction chamber.

[0015] As a further improvement of the present invention, the aerosol generator also includes an electronic injection pump and a sprayer. The electronic injection pump is used to transport 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 discharging 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, wherein an aerosol is introduced into a reaction chamber in a dielectric barrier discharge device, so that 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 carriers in the aerosol, thereby converting active particles with short lifespans into products through physical and chemical reactions, and the products are a chemical substance that can be quantitatively measured, and the concentration of the products is measured by a chemical ionization mass spectrometer, and then the concentration of active particles entering the aerosol and reacting with carriers in the aerosol is reversed through the chemical reaction formula in the conversion process, thereby quantifying the concentration of active particles entering the aerosol. In the existing bioaerosol inactivation technology, the key to bioinactivation is the active particles that enter the aerosol and react with substances in the aerosol. These active particles usually do not emit light and the lifespan of some particles is very short, so 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 the aerosol, and the prepared aerosol is introduced into the dielectric barrier discharge area 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. The concentration of the products of this chemical reaction is detected to quantify the concentration of the active particles that enter the aerosol and participate in the reaction, 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 an aerosol generator is used to make the configured solution into an aerosol. 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 a 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 a 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. The intermediate 1 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 of SO2 and active particles in a plasma discharge region in a method for quantifying the concentration of active particles entering an aerosol provided by the present invention.

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

[0026] Figure 4 A schematic diagram of the structure 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 A schematic structural diagram of a device for quantifying the concentration of active particles entering an aerosol provided by the present invention when a plasma discharge device is connected to a vaporization device.

[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 one. DETAILED DESCRIPTION

[0029] The present invention is 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 a new embodiment.

[0030] In the description of the present invention, it should be noted that for directional words, such as the terms "center", "lateral", "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 drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention. The terms "first", "second", etc. in the specification 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" in the specification and claims of the present invention and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0032] In the present 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, thereby converting the short-lived active particles 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 a chemical ionization mass spectrometer 4, and then the concentration of the active particles that enter the aerosol and react with the carrier in the aerosol is reversely pushed forward through the chemical reaction formula in the conversion process, thereby quantifying the concentration of the active particles that enter 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: Generate multiple active particles in the reaction chamber through high voltage discharge of the plasma discharge device 2. In this step, the plasma discharge device 2 may be a dielectric barrier discharge device, which may generate multiple active particles during the generated discharge process. The multiple active particles may include any one or more mixtures of free radical active particles, excited state active particles or electronic active particles. Such as plasma active particles such as OH, O, NO, etc. These plasma active particles can be used in the process of bioaerosol inactivation.

[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 particle size of the aerosol entering the reaction chamber is in the micrometer or submicrometer order. In this embodiment, the purpose of controlling the particle size of the aerosol entering the reaction chamber to be in the micrometer or submicrometer order is that the penetration depth of the aerosol in the micrometer or submicrometer order is equivalent to that of the short-lived active particles in the plasma, so that all the 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.

[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] Among them, the quantization method of this embodiment has the following advantages:

[0040] 1. In the existing bioaerosol inactivation technology, the key to biological inactivation is the active particles that enter the aerosol and react with the substances in the aerosol. These active particles usually do not emit light and the life of some particles is very short. Therefore, the usual emission spectroscopy method cannot directly measure the concentration of active particles. In this embodiment, a carrier that can react chemically with the active particles to be quantified is used to prepare the aerosol, and the prepared aerosol is introduced into the dielectric barrier discharge area 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. The concentration of the active particles that enter the aerosol and participate in the reaction is quantified by detecting the concentration of the product of this chemical reaction, so as to accurately and effectively measure the concentration of some active particles that do not emit light and have a short life.

[0041] 2. In this embodiment, the carrier can be a substance with calibrated particle size, concentration, and number density. By configuring it into a solution and using the aerosol generator 12 to make the configured solution into an aerosol, and by measuring the concentration of the product of the reaction between the active particles and the carrier in the aerosol, the concentration of the active particles that enter the aerosol and react can be quantified.

[0042] Therefore, in this embodiment, by introducing the aerosol into the reaction chamber in 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 carrier in the aerosol, thereby converting the active particles with a short life into products through the physical and chemical 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 spectrometer 4, and then the concentration of the active particles that enter the aerosol and react with the carrier in the aerosol is reversely pushed forward through the chemical reaction formula in the conversion process, thereby realizing the quantification of the concentration of the active particles entering the aerosol.

[0043] In this embodiment, the aerosol in step S2 may be SO2 aerosol. The purpose of selecting SO2 aerosol is that there have been many studies in the chemical field of SO2 aerosol and active particles, and there are sufficient experimental data on its physical parameters in terms of reaction mechanism and reaction rate. Among them, the reaction principle of SO2 and active particles in the plasma discharge zone 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. In-depth and detailed research is conducted on the reaction mechanism and mass transfer process of active particles and water. At the same time, it is necessary to consider that the particle size of aerosol is in the micron or submicron order, which is comparable to the penetration depth of many active particles, so that active particles can quickly enter the aerosol. Figure 1 and Figure 2 The reaction process between the active particles generated by the discharge and the SO2 aerosol can be concluded that the H2SO4 generated by the active particles can be Figure 1 and Figure 2 given by theoretical research.

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

[0045] In this embodiment, the concentration C of SO2 in the SO2 aerosol can range from 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, the Henry constant is relatively small. However, too high a concentration of SO2 in the aerosol will interfere with the experimental results, mainly because the aerosol surface area ratio is very large. According to Henry's law, the SO2 in the aerosol diffuses into the gas in the plasma discharge zone, changes the composition of the discharge gas, and interferes with the measurement results. Therefore, in order to avoid interference with the discharge gas, it is necessary to reduce the concentration of SO2 in the aerosol. 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 the active particles in the plasma discharge zone.

[0046] In this embodiment, before the prepared aerosol is introduced into the discharge zone of the dielectric barrier discharge device, the particle size of the entering aerosol needs to be adjusted, and the adjustment method is as follows: by adding nitrogen to the prepared aerosol to dilute it, and adjusting the flow rate of the aerosol generated in the aerosol generator 12, and then using the scanning mobility particle size spectrometer 13 to adjust the particle size distribution in the aerosol, so that the particle size of the aerosol entering the discharge zone in the dielectric barrier discharge device is in the micron or submicron order. Through the above method, the particle size of the aerosol entering the discharge zone in the dielectric barrier discharge device is in the micron or submicron order, so that the active particles generated in the discharge zone of the dielectric barrier discharge device that can react with the carrier in the aerosol can quickly enter the aerosol and react with the carrier in the aerosol, so that some active particles with a shorter life span can also quickly enter the aerosol, thereby improving the accuracy of the measurement.

[0047] Next, we take OH radicals as an example to give the conditions that need to be met for measuring the concentration of active particles and prove that the method of this embodiment can quantify the concentration of active particles. After OH radicals enter the aerosol, they will 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] Among them, t is the time for the active particles entering the aerosol to react with SO2. Since the lifetime of OH radicals is about nanoseconds, the integration time t is at most nanoseconds, which is 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 reaction substances H2O, SO2, etc. is sufficient and the concentration before and after the reaction can be ignored, the OH radical will be proportional to the H2SO4 concentration detected in the chemical ionization mass spectrometer, and the ratio is 1:1. Under the experimental conditions set in this embodiment, the concentration of H2O can easily be much greater than the concentration of free radicals, because when configuring the SO2 concentration, its concentration cannot be too low. Therefore, it is necessary to limit the SO2 concentration in the previous text to meet this condition.

[0057] The above analysis of OH radicals proves that the quantification method of this embodiment can effectively quantify the concentration of active particles entering the aerosol. In practical applications, the quantification method of this application 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] In this embodiment, an aqueous solution containing SO2 is atomized to generate an aerosol as a sensor, which is introduced into the plasma discharge area of ​​a dielectric barrier discharge device. Since SO2 in the aerosol is physically dissolved and mainly exists in the aerosol in a molecular state, and the reaction between SO2 aerosol and active particles in atmospheric chemistry has been extensively studied, in this embodiment, the reaction mechanism and reaction kinetics of active particles and SO2 aerosol are analyzed to explore the spatiotemporal evolution of active particles. Combined with the plasma discharge reaction parameters, the key active particles that enter the SO2 aerosol and participate in the reaction can be screened, and the concentration of active particles that enter the SO2 aerosol and react with the substances therein can be inferred from the concentration of the product H2SO4. In this way, the concentration of active particles that enter the aerosol and participate in the reaction is quantified.

[0059] In addition, this embodiment also designs a set of equipment through the above quantification method, and the equipment is used to perform the above method of quantifying the concentration of active particles entering the aerosol. The equipment can be used to perform an experimental operation of a method of quantifying the concentration of active particles entering the aerosol. The equipment is described as follows:

[0060] A device for quantifying the concentration of active particles entering the aerosol, see Figure 3As shown, the method of quantifying the concentration of active particles entering the aerosol quantifies the active particles generated by the plasma discharge device 2 during the high-voltage discharge process. It includes an aerosol generating device 1, a plasma discharge device 2, a vaporizing device 3 and a chemical ionization mass spectrometer 4. The plasma discharge device 2 is provided with a reaction chamber. 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 respectively connected to the aerosol generating device 1 and the vaporizing device 3. The aerosol generating device 1 is used to prepare a carrier that can react with the active particles to be quantified in the reaction chamber into an aerosol, and transport the aerosol into the reaction chamber. The products generated in the reaction chamber enter the vaporizing device 3 for vaporization. The chemical ionization mass spectrometer 4 is connected to the other end of the vaporizing device 3, and is used to measure the concentration of the vaporized product.

[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 active particles that need to be quantified. In this embodiment, 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 the formed aerosol is transported 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 particle size is in the micron or submicron order and enters 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 active particles with short lifespans from entering the aerosol in time, 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 the pipe 5 is 2 mm to 6 mm, and the pipe 5 is a PFA pipe.

[0064] It is understandable 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 As shown. The configuration process can be as follows: introduce SO2 standard gas into water through the sand core filter plate and generate small bubbles. As the bubbles rise, SO2 in the gas diffuses into the water, and the SO2 concentration at the outlet decreases. After a period of time, the SO2 in the gas and water reaches equilibrium. At this time, the SO2 concentration at the outlet is consistent with the concentration at the inlet, and the SO2 concentration in the surface water reaches gas-liquid equilibrium. The SO2 aqueous solution that has reached gas-liquid equilibrium is diluted with deionized water at the same temperature to achieve the configuration of an aqueous solution of SO2 with a different concentration.

[0065] The aerosol generator 12 also includes an electronic injection pump and a sprayer. The electronic injection pump is used to deliver the solution prepared by the solution preparation device 11 to the sprayer. The sprayer makes the carrier solution into an aerosol by spraying. Thus, the carrier solution is turned into an aerosol. In this embodiment, the carrier solution can be a SO2 solution.

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

[0067] It is understandable that the plasma discharge device 2 in this embodiment can be a pulse DBD plasma discharge device 2. In the previous study, 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 round tube with an outer diameter of 6mm and an inner diameter of 4mm. The middle is solid, the two ends are hollow, and there are holes on the pipe for aerosol to enter the quartz glass tube. The medium can be a quartz glass tube, and the quartz glass tube can be a round structure with an inner diameter of 10mm and a tube wall of 2mm. 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. In order to facilitate the observation of the discharge morphology and reduce the interference with the spectral diagnosis, a circle of observation ports is set at the position of the discharge gap on the polytetrafluoroethylene at one end of the coaxial DBD plasma discharge device 2, and a grating spectrometer is used to perform spectral diagnosis on 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 according to the cross-sectional area of ​​the reaction chamber, the parameters such as the aerosol plasma reaction time and power density are calculated.

[0068] The vaporization device 3 can be a stainless steel pipe, which can be heated to 120° C. by a heating belt. 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 above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached 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 components 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 estimated 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, characterized in that: 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, characterized in that 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 regulated by a scanning mobility particle size spectrometer (13) so that the particle size of the aerosol entering the plasma discharge device is in the micrometer order or the 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 vaporizing device (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 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 vaporizing device (3); the aerosol generating device (1) is used to prepare a carrier capable of reacting with the active particles to be quantified in the reaction chamber into an aerosol, and transport the aerosol into the reaction chamber, and the product generated in the reaction chamber enters the vaporizing device (3) for vaporization; the chemical ionization mass spectrometer (4) is connected to the other end of the vaporizing 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 two 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 micrometer level or the submicrometer 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 transport 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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