Simulation system capable of quantitatively adjusting plant phyllosphere exposed micro / nano plastic aerosol

Abstract

The invention provides a simulation system capable of quantitatively adjusting plant phyllosphere exposed micro / nano plastic aerosol, which comprises an ozone generation device, a micro / nano plastic aerosol generation device, an aerosol aging reaction device and a plant culture device, the ozone generation device and the micro / nano plastic aerosol generation device are both connected with an air inlet of the aerosol aging reaction device, and the plant culture device is connected with an air outlet of the aerosol aging reaction device. Ozone generated by the ozone generation device generates hydroxyl radicals under irradiation of an ultraviolet light source of the aerosol aging reaction device, and micro / nano plastic aerosol generated by the micro / nano plastic aerosol generation device is aged in the aerosol aging reaction device through the hydroxyl radicals. And introducing the aged micro / nano plastic aerosol into the plant culture device.

Description

Technical Field

[0001] The invention relates to the technical field of poisoning experimental devices, and in particular to a simulation system capable of quantitatively regulating the exposure of plant leaves to micro / nano plastic aerosols. Background Art

[0002] With the continuous growth of the global population and the popularization of plastic applications, plastic pollution has become an environmental problem that needs to be solved urgently. Microplastics refer to plastic particles with a size between 1 micron and 5 mm. These microplastic particles mainly come from the decomposition of plastic waste through natural aging and degradation processes. Under the influence of various environmental factors such as ultraviolet radiation, mechanical wear and microbial action, plastic waste gradually decomposes into smaller particles. Tiny particles with a size between 1 and 100 nanometers are called nanoplastics. Micro / nanoplastics can enter the atmosphere, land environment, marine environment, freshwater environment and even organisms, forming a global pollution network. Compared with the research on micro / nanoplastics in water environment and soil environment, the research on the environmental behavior and ecological effects of atmospheric micro / nanoplastics was carried out later and significantly lagged behind. The main sources of micro / nanoplastics in the atmosphere are synthetic fibers, rubber tire wear particles and urban dust. These micro / nanoplastics float into the atmosphere under the action of wind, and then migrate in the atmosphere, water and soil by wind and natural sedimentation. They can also reach remote and sparsely populated areas through atmospheric transmission. As an important part of terrestrial ecosystems, plants are exposed to micro / nano plastics in water, soil and atmosphere. From the perspective of the food chain, plants are at the bottom of the food chain and play an important role in it. The absorption and accumulation of micro / nano plastics in plants pose a potential threat to food security and human health. Compared with exposure to micro / nano plastics in the soil, research on the direct exposure of plants to micro / nano plastics from the atmosphere through the leaf interface is very limited.

[0003] In the atmospheric environment, micro-nano plastic particles undergo a complex multiphase aging process, mainly including photochemical aging that causes carbon chain breakage through photooxidative degradation mechanisms under ultraviolet radiation, thermomechanical aging caused by ambient temperature fluctuations leading to glass transition of materials, mechanical wear driven by wind, and mechanical crushing caused by collisions with atmospheric particles to produce secondary particle size classification. These aging processes significantly change the physicochemical properties of micro / nano plastics, such as particle size distribution, surface charge, crystallinity, and specific surface area, resulting in a decrease in molecular weight and increased toxicity. It is worth noting that hydroxyl radicals (·OH) are continuously generated in the atmosphere through photolysis and oxidative degradation pathways, and their concentration can reach 1×10 6 Radicals cm -3, is the natural oxidant with the highest standard redox potential. It has high activity and can trigger chain free radical reactions to accelerate plastic aging, but existing exposure devices cannot simulate this key chemical process. At present, research on plant leaf exposure to micro / nano plastics in the atmosphere is being conducted, such as an exposure simulation device for plant leaf absorption of micro / nano plastics in the atmosphere. The exposure simulation device consists of three parts: an exposure device, a control device, and a bracket: in the exposure device, the airflow can simulate atmospheric deposition and directly enter from the upper end of the main closed device, and the actual environmental dust is deposited on the plant leaf surface; in the control device, the airflow first passes through the purification device to filter out micron and nano plastics, and then simulates atmospheric deposition and enters from the upper end of the main closed device, and the environmental dust that shields the micron and nano plastics is deposited on the plant leaf surface; after the sample is collected, the quantitative analysis of micro / nano plastics absorbed by the plant leaf surface is achieved through hot alkali-assisted-liquid mass spectrometry or thermal cracking gas-mass spectrometry. Although the current mainstream exposure simulation devices can achieve dust deposition and quantify the micro / nano plastics absorbed by the plant leaf surface through airflow simulation, they still have significant limitations. The device uses a fixed atmospheric particle source, which cannot dynamically simulate the ·OH-mediated aging reaction, resulting in distorted assessment of plastic environmental behavior; key variables such as exposure intensity (such as particle flux, oxidant concentration) and duration are difficult to accurately control, which restricts the study of dose-effect relationships; factors such as temperature and humidity fluctuations and particle co-deposition in the actual atmosphere introduce uncontrollable variables, resulting in reduced experimental repeatability and comparability. Key technical issues such as static exposure source limitations, lack of parameter control, and uncontrollable environmental interference have restricted scientific research on the plant absorption distribution and toxicity mechanism of atmospheric micro / nanoplastics. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a simulation system for quantitatively adjusting the exposure of plant leaves to micro / nano plastic aerosols, comprising an ozone generating device, a micro / nano plastic aerosol generating device, an aerosol aging reaction device and a plant cultivation device, wherein the ozone generating device and the micro / nano plastic aerosol generating device are both connected to the air inlet of the aerosol aging reaction device, and the plant cultivation device is connected to the air outlet of the aerosol aging reaction device. The ozone generated by the ozone generating device generates hydroxyl radicals under the irradiation of the ultraviolet light source of the aerosol aging reaction device, the micro / nano plastic aerosol generated by the micro / nano plastic aerosol generating device is aged by the hydroxyl radicals in the aerosol aging reaction device, and the aged micro / nano plastic aerosol is passed into the plant cultivation device.

[0005] Optionally, the ozone generating device includes an air source supply device, a first mass flow controller and an ozone generator which are connected in sequence, and the air outlet of the ozone generator is connected to the air inlet of the aerosol aging reaction device.

[0006] Optionally, the gas source supplied by the gas source supply device is high-purity air or oxygen.

[0007] Optionally, the micro / nano plastic aerosol generating device includes a carrier gas generator, a second mass flow controller and an aerosol generator which are connected in sequence, and the air outlet of the aerosol generator is connected to the air inlet of the aerosol aging reaction device.

[0008] Optionally, the carrier gas generated by the carrier gas generator is zero gas.

[0009] Optionally, the micro / nano plastic aerosol generating device further comprises a dryer for removing water vapor in the micro / nano plastic aerosol, and the dryer is connected to the air outlet of the aerosol generator.

[0010] Optionally, the micro / nano plastic aerosol generating device further comprises an activated carbon filter for removing VOCs in the micro / nano plastic aerosol, and the activated carbon filter is connected to the air outlet of the dryer.

[0011] Optionally, the micro / nano plastic aerosol generating device further comprises a humidity regulator for adjusting the humidity of the micro / nano plastic aerosol, and the humidity regulator is connected to the air outlet of the activated carbon filter.

[0012] Optionally, the humidity regulator includes a humidity exchange tube, which is divided into an inner cavity and an outer cavity by a humidity exchange membrane, the inner cavity is used to pass the micro / nano plastic aerosol, and the outer cavity is used to pass a humid air flow, and the water molecules in the humid air flow in the outer cavity pass through the humidity exchange membrane and enter the micro / nano plastic aerosol in the inner cavity.

[0013] Optionally, the aerosol aging reaction device includes a flow tube reactor and the ultraviolet light source, the air inlet of the flow tube reactor is respectively connected to the air outlets of the ozone generating device and the micro / nano plastic aerosol generating device, and the air outlet of the flow tube reactor is connected to the plant cultivation device; the ultraviolet light source is located on the outside of the flow tube reactor and is used to irradiate the ozone in the flow tube reactor.

[0014] Optionally, the flow tube reactor is a light-transmitting tubular structure.

[0015] Optionally, the aerosol aging reaction device further comprises a cooling water circulation system, and the cooling water circulation system is connected to the flow tube reactor by heat exchange, so as to control the temperature inside the flow tube reactor.

[0016] Optionally, the simulation system capable of quantitatively regulating the exposure of plant leaves to micro / nano plastic aerosols further includes an ozone catalytic decomposer, which is respectively connected to the air outlet of the flow tube reactor and the plant cultivation device.

[0017] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0018] 1. The present invention constructs a simulated environment (i.e., exposure source) for plant leaf interstices to be exposed to micro / nano plastic aerosols by means of an ozone generator, a micro / nano plastic aerosol generator, and an aerosol aging reaction device. The content of micro / nano plastic aerosols in the exposure source can be accurately measured, ensuring the stability and sustainability of the exposure source. At the same time, the exposure conditions can be quantitatively regulated, and effective comparisons can be made by adjusting the simulated environment, thereby meeting the precise requirements of experimental research.

[0019] 2. The exposure source provided by the present invention is highly adjustable and can realize convenient variable control experimental research by regulating the aging degree of micro / nano plastic aerosol airflow and key parameters such as temperature, humidity, and particle concentration. By precisely controlling experimental conditions and combining multi-scale analysis, researchers can obtain highly reliable experimental data, providing strong support for in-depth research in related fields.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic diagram of the structure of a simulation system capable of quantitatively regulating plant leaf-interval exposure to micro / nano plastic aerosols provided in Example 1 of the present invention;

[0023] Figure 2 A schematic diagram of the structure of the simulation device provided for Comparative Example 1;

[0024] Figure 3 A schematic diagram of the structure of the simulation device provided for Comparative Example 2;

[0025] Description of reference numerals:

[0026] 1--Ozone generating device;

[0027] 101--gas supply device;

[0028] 102--the first mass flow controller;

[0029] 103--Ozone generator;

[0030] 2--Micro / nano plastic aerosol generating device,

[0031] 201--Carrier gas generator;

[0032] 202--first mass flow controller;

[0033] 203--Aerosol generator;

[0034] 204--Dryer;

[0035] 205--Activated carbon filter;

[0036] 206--humidity regulator;

[0037] 3--Aerosol aging reaction device;

[0038] 301--Flow tube reactor;

[0039] 302--the ultraviolet light source;

[0040] 303--Cooling water circulation system;

[0041] 4--Ozone catalytic decomposer

[0042] 5--Plant cultivation device. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The terms "on" and "above" and any variations thereof are intended to describe positional relationships and do not represent a relationship of direct contact between the objects described.

[0045] Example 1

[0046] Please refer to Figure 1 An embodiment of the present invention provides a simulation system for quantitatively regulating the exposure of plant leaf interstices to micro / nano plastic aerosols, comprising an ozone generating device 1, a micro / nano plastic aerosol generating device 2, an aerosol aging reaction device 3 and a plant cultivation device 5, wherein the ozone generating device 1 and the micro / nano plastic aerosol generating device 2 are both connected to the air inlet of the aerosol aging reaction device 3, and the plant cultivation device 5 is connected to the air outlet of the aerosol aging reaction device 3. The ozone generated by the ozone generating device 1 generates hydroxyl radicals under the irradiation of the ultraviolet light source of the aerosol aging reaction device 3, the micro / nano plastic aerosol generated by the micro / nano plastic aerosol generating device 2 is aged by the hydroxyl radicals in the aerosol aging reaction device 3, the aged micro / nano plastic aerosol is passed into the plant cultivation device 5, and the plants in the plant cultivation device 5 are exposed to the aged micro / nano plastic aerosol.

[0047] As an embodiment, the ozone generating device 1 includes an air source supply device 101 , a first mass flow controller 102 and an ozone generator 103 which are connected in sequence, and the air outlet of the ozone generator 103 is connected to the air inlet of the aerosol aging reaction device 3 .

[0048] The present embodiment does not limit the specific type of the gas source supplied by the gas source supply device 101 , and the gas source may be, for example, high-purity air or oxygen.

[0049] In this embodiment, the first mass flow controller 102 controls the flow rate of the gas source introduced into the ozone generator 103 to control the flow rate of the generated ozone, thereby controlling the flow rate of the hydroxyl radicals generated in the aerosol aging reaction device 3 .

[0050] The micro / nano plastic aerosol generating device 2 comprises a carrier gas generator 201 , a second mass flow controller 202 and an aerosol generator 203 which are connected in sequence, and the air outlet of the aerosol generator 203 is connected to the air inlet of the aerosol aging reaction device 3 .

[0051] This embodiment does not limit the specific type of carrier gas generated by the carrier gas generator 201, such as nitrogen or zero gas. Taking zero gas as an example, the carrier gas generator 201 is a zero gas generator, and the laboratory air is passed through the zero gas generator to remove organic matter and the like to generate a clean laboratory standard gas mixture. Therefore, the main components of the zero gas include nitrogen, oxygen and water vapor in the air. In this embodiment, zero gas is used as the carrier gas, and the aerosol generator 203 is filled with a micro / nano plastic solution. The zero gas is passed into the aerosol generator 203 to impact the micro / nano plastic solution to generate a micro / nano plastic aerosol.

[0052] In this embodiment, the flow rate of the carrier gas introduced into the aerosol generator 203 is controlled by the second mass flow controller 202 to control the flow rate of the generated micro / nano plastic aerosol and the concentration of the micro / nano plastic aerosol particles.

[0053] This embodiment can control the aging degree of micro / nano plastic aerosol by controlling the flow rate of ozone gas flow and the flow rate of micro / nano plastic aerosol, thereby simulating the aging of micro / nano plastic aerosol under different equivalent atmospheric exposure times.

[0054] In the micro / nano plastic aerosol generating device 2, in order to remove water vapor in the micro / nano plastic aerosol, a dryer 204 is also connected to the air outlet of the aerosol generator 203. The present embodiment does not limit the specific type of the dryer 204, as long as it can remove water vapor in the micro / nano plastic aerosol, such as a silica gel drying tube.

[0055] In the micro / nano plastic aerosol generating device 2, in order to remove VOC (volatile organic compounds, referred to as VOC, volatile organic compounds) in the micro / nano plastic aerosol, an activated carbon filter 205 is also connected to the air outlet of the dryer 204. The purpose of removing VOC in the micro / nano plastic aerosol is to ensure that no pollutants other than micro / nano plastics are introduced in the preparation process of the micro / nano plastic aerosol, and to ensure the stability of the control variables of the plant exposure experiment.

[0056] In the micro / nano plastic aerosol generating device 2, in order to adjust the humidity of the micro / nano plastic aerosol, a humidity regulator 206 is also connected to the air outlet of the activated carbon filter 205, so as to ensure the stability and controllability of the humidity of the micro / nano plastic aerosol airflow.

[0057] This embodiment does not limit the specific type of the humidity regulator 206. For example, the humidity regulator 206 includes a humidity exchange tube, which is divided into an inner cavity and an outer cavity by a humidity exchange membrane. The inner cavity is used to pass the micro / nano plastic aerosol, and the outer cavity is used to pass the humid air flow. The water molecules in the humid air flow in the outer cavity pass through the humidity exchange membrane and enter the micro / nano plastic aerosol in the inner cavity.

[0058] This embodiment does not limit the specific type of the humidity exchange tube. If the humidity exchange tube is a Nafion tube (ie, a perfluorosulfonic acid resin tube), then the humidity exchange membrane is a Nafion membrane.

[0059] By adjusting the airflow speed, water molecules have enough time to be transferred through the Nafion membrane. Use a humidity sensor to monitor the humidity of the output airflow in real time. Adjust the humidity or flow rate of the reference airflow as needed to achieve the target humidity.

[0060] In summary, the micro / nano plastic aerosol generated by the aerosol generator 203 is sequentially passed through the dryer 204 to remove water vapor, and through the activated carbon filter 205 to remove VOC, and then the humidity of the air flow is adjusted by the humidity regulator 206 before being passed into the aerosol aging reaction device 3.

[0061] The aerosol aging reaction device 3 includes a flow tube reactor 302 and an ultraviolet light source 301. The air inlet of the flow tube reactor 302 is respectively connected to the air outlets of the ozone generating device 1 and the micro / nano plastic aerosol generating device 2, and the air outlet of the flow tube reactor 302 is connected to the plant cultivation device 5; the ultraviolet light source 301 is located on the outside of the flow tube reactor 302 and is used to irradiate the ozone in the flow tube reactor 302.

[0062] This embodiment does not limit the specific type of the ultraviolet light source 301 , for example, it may include several ultraviolet lamps.

[0063] In order to ensure that the ultraviolet light source 301 can penetrate the flow tube reactor 302 to irradiate the ozone inside it, the flow tube reactor 302 is a light-transmitting tubular structure, such as made of quartz material with high light transmittance.

[0064] Furthermore, the aerosol aging reaction device 3 also includes a cooling water circulation system, which is connected to the flow tube reactor 302 by heat exchange, and is used to control the temperature in the flow tube reactor 302. In this embodiment, the temperature of the cooling water that performs heat exchange with the gas in the flow tube reactor 302 is adjustable, and the temperature of the airflow in the flow tube reactor 302 can be affected by changing the temperature of the cooling water. At the same time, a temperature regulating device can also be set in the plant cultivation device 5, and the temperature in the plant cultivation device 5 can be adjusted by the temperature regulating device.

[0065] In order to remove unreacted ozone in the aged micro / nano plastic aerosol discharged from the aerosol aging reaction device 3, the air outlet of the flow tube reactor 302 is also connected to an ozone catalytic decomposer 4, that is, the ozone catalytic decomposer 4 is respectively connected to the air outlet of the flow tube reactor 302 and the air inlet of the plant cultivation device 5, so as to eliminate the possible negative effects of subsequent plant exposure.

[0066] This embodiment does not limit the specific catalyst type in the ozone catalytic decomposer 4, for example, it can be a copper-zinc-manganese catalyst.

[0067] In this embodiment, the plant cultivation device 5 includes a sealed and detachable acrylic box, and the closed exposure and cultivation of plants can be achieved through light. The two ends of the plant cultivation device 5 are respectively provided with an air inlet and an exhaust port. The aged micro / nano plastic aerosol discharged from the ozone catalytic decomposer 4 is introduced into the plant cultivation device 5 through the air inlet of the plant cultivation device 5. The plants in the plant cultivation device 5 are exposed to the aged micro / nano plastic aerosol environment. After the preset experimental time, the exhaust gas is discharged through the exhaust port of the plant cultivation device 5.

[0068] In summary, in the present invention, a simulated environment (i.e., exposure source) for plant leaf interlace exposure to micro / nano plastic aerosol is generated by an ozone generating device, a micro / nano plastic aerosol generating device, and an aerosol aging reaction device. The content of micro / nano plastic aerosol in the exposure source is known, so the stability and continuity of the exposure source can be guaranteed; at the same time, the exposure conditions can be quantified, and effective comparison can also be performed by adjusting the simulated environment to meet experimental research;

[0069] The exposure source provided by the present invention can also be adjusted, such as by adjusting key parameters such as the temperature, humidity, micro / nano plastic aerosol particle concentration and aging degree of the micro / nano plastic aerosol airflow, so as to conduct convenient and fast controlled variable experimental research.

[0070] Comparative Example 1

[0071] Please refer to Figure 2The difference compared with Example 1 is that this comparative example removes the ozone generator 103, aerosol generator 203, aerosol aging reaction device 3 and ozone catalytic decomposer 4 in the simulation system for quantitatively adjusting the exposure of plant foliage to micro / nano plastic aerosols provided in Example 1. After the exposure experiment, no leaf nano-polystyrene was detected in the plant foliage in the plant cultivation device 5.

[0072] Comparative Example 2

[0073] Please refer to Figure 3 The difference compared with Example 1 is that this comparative example removes the ozone generator 103, the aerosol aging reaction device 3 and the ozone catalytic decomposer 4 in the simulation system for quantitatively adjusting the exposure of plant foliage to micro / nano plastic aerosols provided in Example 1. After the exposure experiment, the leaf nano-polystyrene concentration of 221 μg / g was detected in the plant foliage in the plant cultivation device 5.

[0074] Comparative Example 3

[0075] Please refer to Figure 1 This comparative example adopts the simulation system provided in Example 1 that can quantitatively adjust the exposure of plant phyllosphere to micro / nano plastic aerosol. After the exposure experiment, the leaf nano-polystyrene concentration detected in the plant phyllosphere in the plant cultivation device 5 was 416 μg / g.

[0076] In the atmosphere, micro / nano plastics undergo a series of aging processes, including ultraviolet (UV) radiation, photodegradation caused by photooxidation, thermal degradation caused by temperature fluctuations in the air, physical wear of micro / nano plastics caused by wind and collisions with other particles in the air, etc. These processes will affect their physicochemical properties and thus change their toxic effects. Hydroxyl radicals (·OH) are one of the strongest oxidants in nature and play an important role in atmospheric chemistry. They can be generated through photochemical reactions and participate in the degradation process of various pollutants. The present invention simulates the aging of micro / nano plastics by hydroxyl radicals through an aerosol aging reaction device, and the aging degree and environmental parameters such as temperature and humidity can be adjusted. Therefore, it not only helps to understand the aging mechanism of micro / nano plastics in the atmospheric environment, but also provides a scientific basis for evaluating their ecological and health risks.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A simulation system capable of quantitatively regulating the exposure of plant leaves to micro / nano plastic aerosols, characterized in that: The invention comprises an ozone generating device, a micro / nano plastic aerosol generating device, an aerosol aging reaction device and a plant cultivation device. The ozone generating device and the micro / nano plastic aerosol generating device are both connected to the air inlet of the aerosol aging reaction device, and the plant cultivation device is connected to the air outlet of the aerosol aging reaction device. The ozone generated by the ozone generating device generates hydroxyl radicals under the irradiation of the ultraviolet light source of the aerosol aging reaction device. The micro / nano plastic aerosol generated by the micro / nano plastic aerosol generating device is aged by the hydroxyl radicals in the aerosol aging reaction device, and the aged micro / nano plastic aerosol is passed into the plant cultivation device.

2. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 1, characterized in that: The ozone generating device comprises an air source supply device, a first mass flow controller and an ozone generator which are connected in sequence, and the air outlet of the ozone generator is connected to the air inlet of the aerosol aging reaction device.

3. The simulation system capable of quantitatively regulating plant leaf-interval exposure to micro / nano plastic aerosols according to claim 2, characterized in that: The gas source supplied by the gas source supply device is high-purity air or oxygen.

4. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 1, characterized in that: The micro / nano plastic aerosol generating device comprises a carrier gas generator, a second mass flow controller and an aerosol generator which are connected in sequence, and the air outlet of the aerosol generator is connected to the air inlet of the aerosol aging reaction device.

5. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 4, characterized in that: The carrier gas generated by the carrier gas generator is zero gas.

6. The simulation system capable of quantitatively regulating plant leaf-interval exposure to micro / nano plastic aerosols according to claim 4, characterized in that: The micro / nano plastic aerosol generating device also includes a dryer for removing water vapor in the micro / nano plastic aerosol, and the dryer is connected to the air outlet of the aerosol generator.

7. The simulation system capable of quantitatively regulating plant leaf-interval exposure to micro / nano plastic aerosols according to claim 6, characterized in that: The micro / nano plastic aerosol generating device also includes an activated carbon filter for removing VOCs in the micro / nano plastic aerosol, and the activated carbon filter is connected to the air outlet of the dryer.

8. The simulation system capable of quantitatively regulating plant leaf-interval exposure to micro / nano plastic aerosols according to claim 7, characterized in that: The micro / nano plastic aerosol generating device further comprises a humidity regulator for adjusting the humidity of the micro / nano plastic aerosol, and the humidity regulator is connected to the air outlet of the activated carbon filter.

9. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 8, characterized in that: The humidity regulator includes a humidity exchange tube, which is divided into an inner cavity and an outer cavity by a humidity exchange membrane. The inner cavity is used to pass the micro / nano plastic aerosol, and the outer cavity is used to pass a humid air flow. The water molecules in the humid air flow in the outer cavity enter the micro / nano plastic aerosol in the inner cavity through the humidity exchange membrane.

10. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 1, characterized in that: The aerosol aging reaction device includes a flow tube reactor and an ultraviolet light source, the air inlet of the flow tube reactor is respectively connected to the air outlets of the ozone generating device and the micro / nano plastic aerosol generating device, and the air outlet of the flow tube reactor is connected to the plant cultivation device; the ultraviolet light source is located outside the flow tube reactor and is used to irradiate the ozone in the flow tube reactor.

11. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 10, characterized in that: The flow tube reactor is a light-transmitting tubular structure.

12. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 10, characterized in that: The aerosol aging reaction device further comprises a cooling water circulation system, which is connected to the flow tube reactor for heat exchange and is used to control the temperature inside the flow tube reactor.

13. The simulation system capable of quantitatively regulating plant leaf exposure to micro / nano plastic aerosols according to claim 10, characterized in that: It also includes an ozone catalytic decomposer, which is connected to the gas outlet of the flow tube reactor and the plant cultivation device respectively.

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