An integrated on-line analysis device for atmospheric VOCs and organic aerosols

Abstract

The application discloses an atmospheric VOCs and organic aerosol integrated online analysis device, which comprises a gas inlet module, an aerosol module and a VOCs module which are sequentially communicated, further comprises a one-way valve, a thermal desorption gas supply module and a gas suction module, the VOCs module and a flow limiting component form a serial connection path, the serial connection path and the one-way valve form a parallel connection path, the first end of the parallel connection path is communicated to the first end of the aerosol module, the second end of the parallel connection path is communicated to the thermal desorption gas supply module and the gas suction module, the air flow direction of the one-way valve is from the gas inlet module to the gas suction module, the gas suction module comprises a first three-way valve, a second three-way valve and a gas suction pump, and the aerosol module is further connected to an analysis module. The device can realize the integrated synchronous collection and online analysis of atmospheric VOCs and organic aerosols, assist in revealing the real generation path and chemical mechanism of atmospheric secondary organic aerosols, and provide more accurate and actual basis for pollution control and atmospheric pollution prevention and control.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring and air pollution analysis technology, and more specifically, to an integrated online analysis device for atmospheric VOCs and organic aerosols. Background Technology

[0002] Atmospheric organic matter is a significant component of air pollution, significantly impacting environmental quality and human health. With the ongoing efforts to control PM2.5, secondary organic aerosols (SOA) have become a major component of fine particulate matter, accounting for over 70% especially during periods of heavy pollution. SOA formation involves complex transformation processes between gaseous and particulate organic matter, making the precise elucidation of its formation mechanism crucial—a key issue in atmospheric chemistry and pollution control.

[0003] Existing instruments for analyzing atmospheric organic compounds include organic carbon / elemental carbon analyzers, aerosol mass spectrometers (AMS), thermal desorption aerosol gas chromatography-mass spectrometry (TAG), and various VOCs analyzers and chemical ionization mass spectrometers based on gas chromatography-mass spectrometry. However, some of these instruments can only detect VOCs at the molecular level, while others can only detect organic aerosols at the molecular level. This leads to the following problems: First, separate collection of gas and particulate phases results in inconsistent data, making it impossible to accurately reconstruct the dynamic formation process of secondary organic aerosols; second, insufficient spatiotemporal resolution prevents the capture of key transformation stages during periods of high pollution; third, the lack of complete molecular-level input data severely restricts the accuracy of source apportionment models and air quality predictions; and fourth, the equipment is bulky, costly to deploy, and complex to maintain, making it difficult to meet the needs of extensive and long-term environmental monitoring. Therefore, there is an urgent need for an integrated device capable of simultaneously measuring atmospheric VOCs and organic aerosols online at the molecular level. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an integrated online analysis device for atmospheric VOCs and organic aerosols. This device enables the simultaneous and online collection and analysis of atmospheric VOCs and organic aerosols, helping to reveal the true formation pathways and chemical mechanisms of secondary organic aerosols in the atmosphere. It provides more accurate and realistic evidence for pollutant control and air pollution prevention, and helps improve the scientific nature of air pollution source tracing and the pertinence of control measures.

[0005] This utility model provides an integrated online analysis device for atmospheric VOCs and organic aerosols, comprising an air inlet module, an aerosol module, and a VOCs module connected in sequence, and further comprising a one-way valve, a thermal desorption gas supply module, and an extraction module. The VOCs module and a flow-limiting component form a series path, and the series path and the one-way valve form a parallel path. The first end of the parallel path is connected to the first end of the aerosol module, and the second end of the parallel path is connected to the thermal desorption gas supply module and the extraction module. The airflow direction of the one-way valve is from the air inlet module to the extraction module. The extraction module includes a first three-way valve, a second three-way valve, and an extraction pump. The first end of the first three-way valve is connected to the third end of the second three-way valve, the second end of the first three-way valve is connected to the second end of the parallel path, and the third end of the first three-way valve is connected to the second end of the aerosol module. The first end of the second three-way valve is connected to the external environment, and the second end of the second three-way valve is connected to the extraction pump. The aerosol module is also connected to an analysis module.

[0006] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the flow-limiting component is a flow-limiting microporous sheet.

[0007] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the VOCs module includes a first heating component and a first temperature control component for performing thermal desorption of VOCs.

[0008] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the aerosol module includes a second heating component and a second temperature control component for performing thermal desorption of aerosols.

[0009] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the thermal desorption gas supply module includes a mass flow controller and a helium container, wherein the mass flow controller is located between the helium container and the second end of the parallel passage.

[0010] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, both the first three-way valve and the second three-way valve are electric three-way valves with intermediate stop function.

[0011] Preferably, the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols further includes a main control module, which is communicatively connected to the VOCs module, the mass flow controller, the first three-way valve, and the second three-way valve.

[0012] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the air intake module includes an air intake pipe and a particulate cutter, a humidifier and a two-way solenoid valve arranged sequentially on the air intake pipe.

[0013] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, an air flow meter is also provided between the second three-way valve and the air pump.

[0014] Preferably, in the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the analysis module is a gas chromatography-mass spectrometry module, and the connection between the analysis module and the aerosol module is achieved by using an injection needle to open or close the pathway.

[0015] As can be seen from the above technical solution, the integrated online analysis device for atmospheric VOCs and organic aerosols provided by this utility model includes an air inlet module, an aerosol module, and a VOCs module connected in sequence. It also includes a one-way valve, a thermal desorption gas supply module, and an extraction module. The VOCs module and the flow-limiting component form a series path, and the series path and the one-way valve form a parallel path. The first end of the parallel path is connected to the first end of the aerosol module, and the second end of the parallel path is connected to the thermal desorption gas supply module and the extraction module. The airflow direction of the one-way valve is from the air inlet module to the extraction module. Therefore, the flow-limiting component and the one-way valve can balance the different flow requirements of VOCs and aerosols during collection. Furthermore, the presence of the one-way valve ensures that during thermal desorption, the gas will not pass through the one-way valve but will only pass through the VOCs module, thus guaranteeing efficient thermal desorption. Furthermore, the extraction module includes a first three-way valve, a second three-way valve, and an extraction pump. The first end of the first three-way valve is connected to the third end of the second three-way valve, the second end of the first three-way valve is connected to the second end of the parallel passage, the third end of the first three-way valve is connected to the second end of the aerosol module, the first end of the second three-way valve is connected to the external environment, and the second end of the second three-way valve is connected to the extraction pump. The aerosol module is also connected to the analysis module. By utilizing the cooperation of these structures, the sampling process, the thermal desorption process, and the purging process can be realized. Thus, it can be seen that the device can realize the integrated synchronous collection and online analysis of atmospheric VOCs and organic aerosols, helping to reveal the true generation path and chemical mechanism of secondary organic aerosols in the atmosphere, providing more accurate and realistic evidence for pollutant treatment and air pollution prevention and control, and helping to improve the scientific nature of air pollution source tracing and the pertinence of treatment measures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 A schematic diagram of an embodiment of an integrated online analysis device for atmospheric VOCs and organic aerosols provided by this utility model;

[0018] Figure 2 This is a schematic diagram of a VOCs module used in this application;

[0019] Figure 3 A schematic diagram showing the communication connections of the main control module;

[0020] Figure 4 This is a schematic diagram of a simultaneous sampling mode for VOCs and aerosols.

[0021] Figure 5 This is a schematic diagram of the thermal desorption mode;

[0022] Figure 6 This is a schematic diagram of the purging and cleaning mode. Detailed Implementation

[0023] The core of this invention is to provide an integrated online analysis device for atmospheric VOCs and organic aerosols, which can realize the integrated synchronous collection and online analysis of atmospheric VOCs and organic aerosols. This helps to reveal the true generation path and chemical mechanism of secondary organic aerosols in the atmosphere, providing more accurate and realistic evidence for pollutant treatment and air pollution prevention and control. It also helps to improve the scientific nature of air pollution source tracing and the pertinence of treatment measures. This device can be applied to various scenarios such as urban environment, industrial park, transportation corridor, extreme weather and sudden pollution events.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] An example of an implementation of the integrated online analysis device for atmospheric VOCs and organic aerosols provided by this utility model. Figure 1 As shown, Figure 1This is a schematic diagram of an embodiment of an integrated online analyzer for atmospheric VOCs and organic aerosols provided by this utility model. The integrated online analyzer for atmospheric VOCs and organic aerosols may include an inlet module 1, an aerosol module 2, and a VOCs module 3 connected in sequence. Gas entering from the inlet module 1 can sequentially enter the aerosol module 2 and the VOCs module 3. It also includes a one-way valve 5, a thermal desorption gas supply module 6, and an extraction module 7. Furthermore, the VOCs module 3 and the flow-limiting component 4 form a series circuit, thus limiting the gas flow rate through the VOCs module to a small range, preventing the flow rate from exceeding the required level. The series path and the one-way valve 5 form a parallel path. With this parallel path, most of the gas that cannot pass through the series path can flow through the one-way valve 5, preventing the accumulation of high pressure that cannot be released. Furthermore, the first end of the parallel path is connected to the first end of the aerosol module 2, and the second end is connected to the thermal desorption gas supply module 6 and the extraction module 7. The thermal desorption gas supply module 6 provides inert gas for reverse gas supply, allowing the thermally desorbed organic matter to be purged out for subsequent detection. The one-way valve 5 has a flow direction from the inlet module 1 to the extraction module 7. Figure 1See, the gas can only flow from left to right, but not from right to left. This ensures that during the thermal desorption process, all gas passes through the VOCs module, maximizing the efficiency of thermal desorption. The aforementioned extraction module 7 may include a first three-way valve 71, a second three-way valve 72, and an extraction pump 73. The first end A of the first three-way valve 71 is connected to the third end C1 of the second three-way valve 72, and the second end B of the first three-way valve 71 is connected to the second end of the aforementioned parallel passage. The third terminal C of module 1 is connected to the second terminal of aerosol module 2. The first terminal A1 of the second three-way valve 72 is connected to the external environment, and the second terminal B1 of the second three-way valve 72 is connected to the vacuum pump 73. This connection can be direct or indirect; there are no restrictions. Aerosol module 2 is also connected to analysis module 9. In this case, when A, B, C1, and B1 are open, and C and A1 are closed—that is, when A is connected to B, and also connected to C1 and B1—synchronous data collection occurs. Under the action of the air pump 73, air is introduced from the air inlet. The aerosol module 2 is connected to the VOCs module 3 and the air inlet module 1. Air passes through the aerosol module 2 and the VOCs module 3 in sequence, thereby achieving simultaneous collection of VOCs and aerosols during the gas extraction process. When A, B, C, A1, B1 and C1 are closed, the thermal desorption gas supply module 6 is turned on to enter the thermal desorption mode. The injection needle pierces the double septum and enters the injection port of the analysis module, allowing the VOCs collected by the VOCs module to be thermally desorbed for detection. The system can detect organic matter in aerosols collected by the aerosol module by thermal desorption. When C, A, C1, and A1 are turned on and B and B1 are turned off, the thermal desorption gas supply module 6 is turned on. Inert gas can then pass through the VOCs module, aerosol module, C, A, C1, and A1 in sequence, and finally be introduced into the atmospheric environment. This achieves purging and cleaning of the entire collection pipeline to facilitate subsequent sample collection. In purging mode, the injection needle retracts to the middle of the double septum and disconnects from the analysis module.

[0026] It should be noted that this embodiment solves the problem of flow rate mismatch in the simultaneous collection of aerosols and VOCs. This is because the sampling flow rate of aerosols is much greater than the flow rate required for VOCs sampling. The VOCs sampling flow rate is 10-200 ml / min, while the flow rate range of the aerosol collection method (impact method) is in the L / min range. Direct combination would cause the VOCs module to fail to collect samples normally. The solution here is to introduce a flow-limiting component in the VOCs module path and design a parallel path. When collecting a large flow of aerosols, only a small flow rate enters the VOCs module, and the remaining flow rate bypasses through the parallel path, which effectively balances the flow rate requirements. This embodiment also resolves the conflict in the carrier gas path during thermal desorption. Specifically, during thermal desorption, without special design, the carrier gas will preferentially pass through the low-resistance parallel path, causing the VOCs module to fail to achieve effective thermal desorption. The solution here is to set a one-way valve in the parallel path. In sampling mode, the one-way valve is open, and the airflow is unobstructed. In thermal desorption mode, the airflow is reversed, the one-way valve is automatically closed, and the thermal desorption carrier gas is forced to pass through the VOCs module path to perform complete thermal desorption of the collected VOCs sample.

[0027] As can be seen from the above technical solution, the embodiment of the integrated online analysis device for atmospheric VOCs and organic aerosols provided by this utility model includes an air inlet module, an aerosol module, and a VOCs module connected in sequence. The VOCs module and the flow limiting component form a series path, and the series path and the one-way valve form a parallel path. The other end of the parallel path is connected to the thermal desorption gas supply module and the extraction module. The airflow direction of the one-way valve is from the air inlet module to the extraction module. It can be seen that the flow limiting component and the one-way valve can balance the contradiction between the different flow requirements of VOCs and aerosols during collection. Moreover, with the presence of the one-way valve, the gas will not pass through the one-way valve during thermal desorption, but can only pass through the VOCs module. This ensures the high efficiency of thermal desorption. Furthermore, the extraction module includes... The device consists of a first three-way valve, a second three-way valve, and an air extraction pump. The first end of the first three-way valve is connected to the third end of the second three-way valve, the second end of the first three-way valve is connected to a parallel passage, and the third end of the first three-way valve is connected to an aerosol module. The first end of the second three-way valve is connected to the external environment, and the second end of the second three-way valve is connected to the air extraction pump. By utilizing the coordination of these structures, simultaneous sampling, VOCs and aerosol analysis, thermal desorption, and purging processes can be achieved. Thus, the device can realize integrated simultaneous collection and online analysis of atmospheric VOCs and organic aerosols, helping to reveal the true generation path and chemical mechanism of secondary organic aerosols in the atmosphere, providing more accurate and realistic evidence for pollutant treatment and air pollution prevention and control, and helping to improve the scientific nature of air pollution source tracing and the pertinence of treatment measures.

[0028] In a specific embodiment of the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, the flow limiting component 4 can preferably be a flow limiting microporous sheet. This flow limiting microporous sheet can be a circular thin sheet with one or more micro-holes in the center. The pore size is usually in the micrometer range. The fluid is throttled through these micro-holes, so that the fluid generates a pressure drop when passing through the micro-holes, thereby limiting the flow rate. Of course, other types of flow limiting components can also be selected according to actual needs, which is not limited here.

[0029] In another specific embodiment of the aforementioned integrated online analysis device for atmospheric VOCs and organic aerosols, refer to Figure 2 , Figure 2 This is a schematic diagram of a VOCs module used in this application. The VOCs module 3 may include a first heating element 31 for performing thermal desorption of VOCs and a first temperature control element. Figure 2 (Not shown) This first temperature control component can use a temperature probe to measure the temperature and feed the detected temperature back to the temperature controller in the electrical box to determine whether the first heating component 31 should be heated or not, thus achieving the effect of heating and temperature control. The temperature controller can be controlled by a computer. Figure 2 The diagram also illustrates the VOCs adsorption and collection tube 32, demonstrating that it provides independent heating and temperature control components for the VOCs adsorption process, thus avoiding interference from the aerosol desorption process. Furthermore, the aforementioned aerosol module 2 may include a second heating component and a second temperature control component for aerosol thermal desorption. This indicates that the aerosol thermal desorption process and the VOCs thermal desorption process can be performed separately at different temperatures, achieving more efficient thermal desorption within their respective temperature environments. In summary, this embodiment resolves the problem of conflicting thermal desorption temperature ranges. Specifically, existing high-temperature aerosol desorption methods are not suitable for VOCs; therefore, a separate heating unit (first heating component 31 and first temperature control component) is required for the VOCs module's thermal desorption process. Moreover, precise temperature control via PID control, but not limited to, can be used to prevent VOCs sample degradation.

[0030] In another specific embodiment of the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, refer to... Figure 1 The thermal desorption gas supply module 6 may include a mass flow controller 61 and a helium container 62, with the mass flow controller 61 located between the helium container 62 and the second end of the parallel passage. In this configuration, helium can be supplied to the entire gas pipeline, and the mass flow controller 61 can be used to control the flow rate of helium entering the gas pipeline, thereby achieving precise on-demand control of the gas flow. Of course, other types of inert gas containers can also be selected according to actual needs; this is not limited here. Furthermore, other types of gas flow control devices can also be selected; this is also not limited here.

[0031] In a preferred embodiment of the aforementioned integrated online analysis device for atmospheric VOCs and organic aerosols, both the first three-way valve 71 and the second three-way valve 72 can preferably be electric three-way valves with intermediate stop function. These combine the multi-functionality and intermediate stop function of an electric three-way valve, enabling more precise control under specific operating conditions. They typically consist of an electric actuator and a three-way valve body. The valve body has three ports, classified as either a confluence type (two inlets and one outlet) or a diversion type (one inlet and two outlets). The electric three-way valve with intermediate stop function adds intermediate stop control logic to the actuator, allowing it to remain stationary at a specific position. The electric actuator receives signals from the control system (such as 4-20mA or 1-5V DC) and drives the valve core to move within the valve seat, thereby achieving diversion or confluence control of the fluid. The intermediate stop function precisely controls the motor of the actuator, keeping the valve core in the intermediate position, achieving temporary stagnation or partial flow of the fluid. Based on this, refer to... Figure 3 , Figure 3 The diagram illustrates the communication connections of the main control module. The aforementioned device may also include a main control module 8, which is communicatively connected to the VOCs module 3, the mass flow controller 61, the first three-way valve 71, and the second three-way valve 72. This allows the main control module 8 to automatically control the opening and closing of each valve, as well as parameters such as the flow rate of the mass flow controller, without human intervention, and ensures more precise control. Of course, from... Figure 3 As can be seen, this main control module 8 can also communicate with many other components, such as the first temperature control component, the second temperature control component, the injection needle, etc., which will not be elaborated here.

[0032] In another preferred embodiment of the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, refer to... Figure 1 The aforementioned air intake module 1 may include an air intake pipe 11 and a particulate cutter 12, a humidifier 13, and a two-way solenoid valve 14 sequentially arranged on the air intake pipe 11. It should be noted that the main function of the particulate cutter 12 is to separate particles of a specific size from the airflow based on the aerodynamic properties of the particles for subsequent monitoring and analysis. It mainly utilizes principles such as inertial impaction, centrifugal separation, or gravity sedimentation to achieve particle separation. It can remove particles larger than 2.5 micrometers in diameter, retaining particles smaller than 2.5 micrometers (PM2.5), ensuring that the airflow entering the monitoring instrument contains only particles within the target size range. Furthermore, the humidifier 13 can be used to adjust the intake air humidity to increase the humidity of the particles and improve the efficiency of particle collection. The two-way solenoid valve 14 is used to control the opening or closing of the air intake pipe and can also communicate with the main control module 8 to receive its control, thereby further improving the level of automation control.

[0033] In another preferred embodiment of the above-mentioned integrated online analysis device for atmospheric VOCs and organic aerosols, refer to... Figure 1 A flow meter 74 can be installed between the second three-way valve 72 and the vacuum pump 73 to monitor and control the aerosol vacuum flow rate, thereby further improving the accuracy of airflow control. Furthermore, the analysis module 9 can preferably be a gas chromatography-mass spectrometry (GC-MS) module. The connection between the analysis module 9 and the aerosol module 2 can be opened or closed using an injection needle. Specifically, when the injection needle is inserted downwards, the connection is opened, allowing thermally desorbed organic matter to enter the GC-MS module for online molecular-level analysis and detection. When the injection needle retracts upwards, the connection is closed, which is suitable for aerosol collection and gas path scavenging processes (details omitted here). This GC-MS module can also communicate with the main control module 8 for control.

[0034] The three usage modes of the above device are described in detail below:

[0035] (1) Reference Figure 4 , Figure 4 This is a schematic diagram of the simultaneous sampling mode for VOCs and aerosols / GC analysis mode.

[0036] Opening the two-way solenoid valve 14 connects the first three-way valve 71 to A and B, and the second three-way valve 72 connects B1 and C1. Under the action of the pump set to the aerosol collection flow rate, the device is in atmospheric VOCs and aerosol sampling mode. Specifically, air enters the inlet module through the sampling port, all airflow passes through the aerosol module, and most airflow bypasses the VOCs module through a parallel path. Only a small portion of suitable airflow enters the VOCs module through the flow-limiting microporous plate for VOCs collection. At this time, the one-way valve is open to ensure unobstructed bypass passages, meeting the high-flow-rate sampling requirements for aerosols. In this sampling mode, the injection needle is positioned between two sealed septa, and both the VOCs module and the aerosol module are isolated from the gas chromatography-mass spectrometry (GC-MS) module. Simultaneously, the GC-MS module analyzes the previously collected VOCs and aerosol samples.

[0037] (2) Reference Figure 5 , Figure 5 This is a schematic diagram of the thermal desorption mode.

[0038] With the two-way solenoid valve 14 closed, the first three-way valve 71 and the second three-way valve 72 are in a neutral position (neither end is open). The carrier gas enters the VOCs module and the aerosol module sequentially through the mass flow controller (MFC). The injection needle pierces the double septum and enters the injection port of the gas chromatography-mass spectrometry (GC-MS) module. Both the VOCs module and the aerosol module are connected to the GC-MS module. The one-way valve closes due to the reversed gas flow direction, forcing the carrier gas through the VOCs module for thermal desorption of the adsorbed VOCs sample. The VOCs module and the aerosol module complete sample desorption through precise temperature control. The desorbed VOCs and aerosol organics then enter the GC-MS module for qualitative and quantitative analysis.

[0039] (3) Reference Figure 6 , Figure 6 This is a schematic diagram of the purging and cleaning mode.

[0040] The device enters the cleaning mode, closes the two-way solenoid valve 14, connects the first three-way valve 71 to A and C, and connects the second three-way valve 72 to A1 and C1. The MFC controls the carrier gas flow rate, and the check valve remains closed, thereby achieving a comprehensive purging and cleaning of the VOCs module and aerosol module and their piping system, removing system residues and background interference, improving analytical accuracy and system stability, and preparing for the next round of sample collection.

[0041] The above process ensures the simultaneous collection and efficient analysis of atmospheric VOCs and organic aerosols, effectively solving technical challenges in airflow distribution, sample thermal desorption, and gas path switching, thus achieving integrated online analysis. This device not only collects organic aerosols but also incorporates a VOCs module, overcoming the technical bottleneck of simultaneous measurement of gaseous and particulate organic matter. Furthermore, it improves the airflow and thermal desorption paths. Addressing the mismatch between VOCs and particulate matter collection flow rates, a flow-limiting microporous plate + parallel pathway structure was fabricated to ensure normal sampling by the VOCs module without affecting the large-flow-rate particulate matter collection. During the thermal desorption stage, a one-way valve automatically changes the airflow path, completely resolving the issue of carrier gas preferentially passing through the low-resistance bypass channel, achieving efficient and complete VOCs thermal desorption. The independent heating unit for the VOCs module and precise temperature control ensure the integrity and efficient desorption of organic matter with different volatility levels. This device is highly integrated and flexible in control. It uses a combination of a three-way solenoid valve and a two-way valve with an intermediate stop position, and works with MFC to achieve efficient automatic switching between sampling, thermal desorption and purging cleaning, reducing system complexity and maintenance costs. It is applicable to a wide range of scenarios and has strong data continuity.

[0042] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated on-line analysis device for atmospheric VOCs and organic aerosols, characterized by, The system includes an intake module, an aerosol module, and a VOCs module connected in sequence. It also includes a one-way valve, a thermal desorption gas supply module, and an extraction module. The VOCs module and the flow-limiting component form a series path, and the series path and the one-way valve form a parallel path. The first end of the parallel path is connected to the first end of the aerosol module, and the second end of the parallel path is connected to the thermal desorption gas supply module and the extraction module. The one-way valve directs airflow from the intake module to the extraction module. The extraction module includes a first three-way valve, a second three-way valve, and an extraction pump. The first end of the first three-way valve is connected to the third end of the second three-way valve, the second end of the first three-way valve is connected to the second end of the parallel path, and the third end of the first three-way valve is connected to the second end of the aerosol module. The first end of the second three-way valve is connected to the external environment, and the second end of the second three-way valve is connected to the extraction pump. The aerosol module is also connected to an analysis module.

2. The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 1, characterized in that, The current-limiting component is a current-limiting microporous sheet. 3.The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 1, characterized in that, The VOCs module includes a first heating component and a first temperature control component for performing VOCs thermal desorption. 4.The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 1, characterized in that, The aerosol module includes a second heating component and a second temperature control component for performing thermal desorption of aerosols.

5. The integrated on-line analysis device for atmospheric VOCs and organic aerosols according to any one of claims 1-4, characterized in that, The thermal desorption gas supply module includes a mass flow controller and a helium container, with the mass flow controller located between the helium container and the second end of the parallel passage.

6. The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 5, characterized in that, Both the first three-way valve and the second three-way valve are electric three-way valves with intermediate stop function.

7. The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 6, characterized in that, It also includes a main control module, which is communicatively connected to the VOCs module, the mass flow controller, the first three-way valve, and the second three-way valve. 8.The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 1, characterized in that, The air intake module includes an air intake pipe and a particulate cutter, a humidifier, and a two-way solenoid valve arranged sequentially on the air intake pipe. 9.The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 1, characterized in that, An air flow meter is also installed between the second three-way valve and the air pump. 10.The atmospheric VOCs and organic aerosol integrated online analysis device according to claim 1, characterized in that, The analysis module is a gas chromatography-mass spectrometry module, and the connection between the analysis module and the aerosol module is achieved by using an injection needle to open or close the pathway.

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