Atmospheric mercury sampling device based on directional wind

Abstract

The application relates to a device for sampling atmospheric mercury based on directional wind, which comprises a wind direction indicator, a first zero gas tank, a first mercury collection assembly, a first air inlet channel, a second zero gas tank, a second mercury collection assembly and a second air inlet channel; the wind direction indicator is used for detecting a first directional wind and a second directional wind, the first directional wind and the second directional wind have a first preset angle, the first air inlet channel is located on the first directional wind, and the second air inlet channel is located on the second directional wind; when the wind direction indicator detects the first directional wind, the first mercury collection assembly and the first air inlet channel are communicated, and the second zero gas tank and the second air inlet channel are communicated; when the wind direction indicator detects the second directional wind, the first mercury collection assembly and the first zero gas tank are communicated, and the second mercury collection assembly and the second air inlet channel are communicated. The device can collect atmospheric mercury according to different directional winds.

Description

Technical Field

[0001] This invention relates to the field of atmospheric sampling technology, and in particular to an atmospheric mercury sampling device based on directional wind. Background Technology

[0002] Mercury is a toxic heavy metal that is liquid at normal temperature and pressure. It can volatilize into the atmosphere at -38°C and remain there for a considerable period, allowing it to travel long distances. Atmospheric mercury can settle to the Earth's surface, where it is converted into highly toxic methylmercury by microorganisms or other chemical processes, posing potential risks to ecological security and human health. Furthermore, mercury at the Earth's surface can also be reduced to elemental mercury through complex physical or chemical processes and released back into the atmosphere.

[0003] Atmospheric mercury can migrate and be transported along horizontal, upwind, and downwind directions. Due to the unique physicochemical properties of mercury, the concentration distribution and isotopic fractionation of atmospheric mercury differ in each wind direction. Atmospheric mercury concentration in the horizontal wind direction represents the characteristics of horizontal migration, atmospheric mercury concentration in the upwind direction represents the characteristics of atmospheric mercury release to the Earth's surface, and concentration in the downwind direction represents the characteristics of atmospheric mercury deposition to the Earth's surface. Currently, atmospheric mercury monitoring mainly focuses on total quantity or speciation, and cannot provide in-depth and comprehensive research on the migration characteristics of atmospheric mercury.

[0004] Therefore, this invention proposes an atmospheric mercury sampling device based on directional wind. Summary of the Invention

[0005] (1) Technical problems to be solved

[0006] This invention provides an atmospheric mercury sampling device based on directional wind, which solves the technical problem that existing technologies cannot sample and study the migration characteristics of atmospheric mercury.

[0007] (2) Technical solution

[0008] To address the aforementioned technical problems, this invention proposes an atmospheric mercury sampling device based on directional wind, comprising an anemometer, a first zero gas tank, a first mercury collection assembly, a first air inlet channel, a second zero gas tank, a second mercury collection assembly, and a second air inlet channel;

[0009] The wind vane is used to detect wind in a first direction and wind in a second direction. There is a first preset angle between the first wind and the second wind. The first air intake channel is located on the first wind and the second air intake channel is located on the second wind.

[0010] When the wind vane detects wind in the first direction, the first mercury collection assembly is connected to the first air intake channel, and the second zero gas tank is connected to the second air intake channel.

[0011] When the wind vane detects wind in the second direction, the first mercury collection component is connected to the first zero gas tank, and the second mercury collection component is connected to the second air intake channel.

[0012] Optionally, the atmospheric mercury sampling device based on directional wind further includes a third zero gas tank, a third mercury collection assembly, and a third air intake channel. The wind vane is also used to detect a third directional wind. There is a second preset angle between the first directional wind and the third directional wind, and a third preset angle between the second directional wind and the third directional wind. The third air intake channel is located on the third directional wind.

[0013] When the wind vane detects wind in the first direction, the first mercury collection assembly is connected to the first air intake channel, the second zero gas tank is connected to the second air intake channel, and the third zero gas tank is connected to the third air intake channel;

[0014] When the wind vane detects wind in the second direction, the first zero gas tank and the first air intake channel are connected, the second mercury collection assembly and the second air intake channel are connected, and the third zero gas tank and the third air intake channel are connected.

[0015] When the wind vane detects the third direction wind, the first zero gas tank and the first air intake channel are connected, the zero gas tank and the second air intake channel are connected, and the third mercury collection assembly and the third air intake channel are connected.

[0016] Optionally, the first directional wind is a horizontal wind, the second directional wind is an upwind wind, and the third directional wind is a downwind wind.

[0017] Optionally, the directional wind-based atmospheric mercury sampling device further includes a first three-way valve, a second three-way valve, and a third three-way valve. The first air intake channel can be connected to the first zero gas tank and the first mercury collection component through the first three-way valve, the second air intake channel can be connected to the second zero gas tank and the second mercury collection component through the second three-way valve, and the third air intake channel can be connected to the third zero gas tank and the third mercury collection component through the third three-way valve.

[0018] Optionally, the atmospheric mercury sampling device based on directional wind further includes a control element, wherein the first three-way valve, the second three-way valve, and the third three-way valve are all solenoid valves, and the control element is electrically connected to the first three-way valve, the second three-way valve, and the third three-way valve, respectively.

[0019] Optionally, a first check valve is provided between the first three-way valve and the first intake channel, a second check valve is provided between the second three-way valve and the second intake channel, and a third check valve is provided between the third three-way valve and the third intake channel.

[0020] Optionally, the first mercury collection assembly includes a first mercury collection tube and a first vacuum pump, wherein the first vacuum pump, the first mercury collection tube and the first three-way valve are connected in sequence.

[0021] The second mercury collection assembly includes a second mercury collection tube and a second vacuum pump, wherein the second vacuum pump, the second mercury collection tube and the second three-way valve are connected in sequence.

[0022] The third mercury collection assembly includes a third mercury collection tube and a third vacuum pump, which are connected in sequence.

[0023] Optionally, a first mass flow controller is provided between the first mercury collection tube and the first vacuum pump, a second mass flow controller is provided between the second mercury collection tube and the second vacuum pump, and a third mass flow controller is provided between the third mercury collection tube and the third vacuum pump.

[0024] Optionally, the first air intake channel, the second air intake channel, and the third air intake channel are each provided with a filter membrane.

[0025] Optionally, the filter membrane is a Teflon filter membrane.

[0026] (3) Beneficial effects

[0027] In summary, the directional wind-based atmospheric mercury sampling device of this invention can collect atmospheric mercury according to different wind directions, and analyze its migration characteristics based on the atmospheric mercury collected from different wind directions. This directional wind-based atmospheric mercury sampling device can be used in conjunction with online atmospheric mercury analysis. By collecting atmospheric mercury from different wind directions, analysis and research can be conducted to accurately analyze the concentration distribution, flux, and isotope ratios of atmospheric mercury in different directions. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of an atmospheric mercury sampling device based on directional wind in one embodiment of the present invention.

[0030] In the picture:

[0031] 100-Atmospheric mercury sampling device based on directional wind; 10-Wind vane; 11-First zero gas tank; 12-First mercury collection assembly; 122-First mercury trapping tube; 124-First suction pump; 13-First air inlet channel; 14-Second zero gas tank; 15-Second mercury collection assembly; 152-Second mercury trapping tube; 154-Second suction pump; 16-Second air inlet channel; 17-Third zero gas tank; 18-Third mercury collection assembly; 182-Third mercury trapping tube; 184-Third suction pump; 19-Third air inlet channel; 20-First three-way valve; 21-Second three-way valve; 22-Third three-way valve; 23-First check valve; 24-Second check valve; 25-Third check valve; 26-First mass flow controller; 27-Second mass flow controller; 28-Third mass flow controller. Detailed Implementation

[0032] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0035] Please refer to Figure 1An atmospheric mercury sampling device 100 based on directional wind includes an anemometer 10, a first zero gas tank 11, a first mercury collection assembly 12, a first air intake channel 13, a second zero gas tank 14, a second mercury collection assembly 15, and a second air intake channel 16. The anemometer 10 is used to detect a first directional wind and a second directional wind, which have a first preset angle. The first air intake channel 13 is located on the first directional wind, and the second air intake channel 16 is located on the second directional wind. When the anemometer 10 detects the first directional wind, the first mercury collection assembly 12 and the first air intake channel 13 are connected, and the second zero gas tank 14 and the second air intake channel 16 are connected. When the anemometer 10 detects the second directional wind, the first mercury collection assembly 12 and the first zero gas tank 11 are connected, and the second mercury collection assembly 15 and the second air intake channel 16 are connected.

[0036] In this embodiment, the atmospheric mercury sampling device 100 based on directional wind uses an anemometer 10 to detect the first directional wind and the second directional wind. The first zero air tank 11 and the second zero air tank 14 are mercury-free filters. The air filtered by the first zero air tank 11 and the second zero air tank 14 is free of mercury, resulting in mercury-free atmosphere.

[0037] When the anemometer 10 detects wind from the first direction, the first mercury collection assembly 12 is connected to the first air intake channel 13, the first empty gas tank 11 is not connected to the first air intake channel 13, the second empty gas tank 14 is connected to the second air intake channel 16, and the second mercury collection assembly 15 is not connected to the second air intake channel 16. The first mercury collection assembly 12 collects atmospheric mercury from the wind from the first direction, while the second empty gas tank 14 filters air from the wind from the second direction to prevent interference with the first air intake channel 13. The first mercury collection assembly 12 collects atmospheric mercury from the wind from the first direction and then analyzes and studies the collected atmospheric mercury. Similarly, when the anemometer 10 detects wind from the second direction, the first mercury collection assembly 12 is not connected to the first air intake channel 13, the first empty gas tank 11 is connected to the first air intake channel 13, the second empty gas tank 14 is not connected to the second air intake channel 16, and the second mercury collection assembly 15 is connected to the second air intake channel 16. The second mercury collection component 15 collects atmospheric mercury from the second directional wind, and then analyzes and studies the collected atmospheric mercury.

[0038] This embodiment of the directional wind-based atmospheric mercury sampling device 100 can collect atmospheric mercury according to different wind directions, and analyze its migration characteristics based on the atmospheric mercury collected from different wind directions. This directional wind-based atmospheric mercury sampling device 100 can be used in conjunction with online atmospheric mercury analysis. By collecting atmospheric mercury from different wind directions, it can analyze and study the atmospheric mercury, accurately analyzing the concentration distribution, flux, and isotope ratios of atmospheric mercury in different directions.

[0039] In one embodiment, the atmospheric mercury sampling device 100 based on directional wind further includes a third zero gas tank 17, a third mercury collection assembly 18, and a third air intake channel 19. The anemometer 10 is also used to detect a third directional wind. The first directional wind and the third directional wind have a second preset angle between them, and the second directional wind and the third directional wind have a third preset angle between them. The third air intake channel 19 is located on the third directional wind. When the anemometer 10 detects the first directional wind, the first mercury collection assembly 12 and the first air intake channel 13 are connected, and the second zero gas tank 14 and the second air intake channel 19 are connected. Channel 16 is connected, the third zero gas tank 17 and the third air intake channel 19 are connected; when the wind vane 10 detects the second direction wind, the first zero gas tank 11 and the first air intake channel 13 are connected, the second mercury collection assembly 15 and the second air intake channel 16 are connected, and the third zero gas tank 17 and the third air intake channel 19 are connected; when the wind vane 10 detects the third direction wind, the first zero gas tank 11 and the first air intake channel 13 are connected, the zero gas tank and the second air intake channel 16 are connected, and the third mercury collection assembly 18 and the third air intake channel 19 are connected.

[0040] When the wind vane 10 detects wind from the first direction, the first mercury collection assembly 12 is connected to the first air intake channel 13, the first zero gas tank 11 is not connected to the first air intake channel 13, the second zero gas tank 14 is connected to the second air intake channel 16, the second mercury collection assembly 15 is not connected to the second air intake channel 16, the third zero gas tank 17 is connected to the third air intake channel 19, and the third mercury collection assembly 18 is not connected to the third air intake channel 19. The first mercury collection assembly 12 collects atmospheric mercury from the wind from the first direction, while the second zero gas tank 14 filters air from the wind from the second direction, and the third zero gas tank 17 filters air from the wind from the third direction to prevent interference with the first air intake channel 13. The first mercury collection assembly 12 collects atmospheric mercury from the wind from the first direction, and then the collected atmospheric mercury is analyzed and studied. Similarly, when the anemometer 10 detects wind from the second direction, the first mercury collection assembly 12 and the first air intake channel 13 are not connected, the first zero gas tank 11 and the first air intake channel 13 are connected, the second zero gas tank 14 and the second air intake channel 16 are not connected, the second mercury collection assembly 15 and the second air intake channel 16 are connected, the third zero gas tank 17 and the third air intake channel 19 are connected, and the third mercury collection assembly 18 and the third air intake channel 19 are not connected. The second mercury collection assembly 15 collects atmospheric mercury from the wind from the second direction, and then analyzes and studies the collected atmospheric mercury. Similarly, when the anemometer 10 detects wind from the third direction, the first mercury collection assembly 12 and the first air intake channel 13 are not connected, the first zero gas tank 11 and the first air intake channel 13 are connected, the second zero gas tank 14 and the second air intake channel 16 are connected, the second mercury collection assembly 15 and the second air intake channel 16 are not connected, the third zero gas tank 17 and the third air intake channel 19 are not connected, and the third mercury collection assembly 18 and the third air intake channel 19 are connected. The third mercury collection component 18 collects atmospheric mercury from a third-direction wind, and then analyzes and studies the collected atmospheric mercury. The first preset angle, the second preset angle, and the third preset angle can be set according to user needs.

[0041] Understandably, depending on user needs, the wind vane 10 can also detect winds in the fourth direction, fifth direction, etc. Correspondingly, the atmospheric mercury sampling device 100 based on directional wind also includes a fourth zero gas tank, a fourth mercury collection component and a fourth air intake channel, a fifth zero gas tank, a fifth mercury collection component and a fifth air intake channel, etc. These will not be listed exhaustively here.

[0042] In one embodiment, the first directional wind is a horizontal wind, the second directional wind is an upwind, and the third directional wind is a downwind. By collecting atmospheric mercury from the horizontal wind, the characteristics of horizontal migration can be analyzed; by collecting atmospheric mercury from the upwind, the characteristics of atmospheric mercury release and migration from the Earth's surface can be analyzed; and by collecting atmospheric mercury from the downstream airflow, the characteristics of atmospheric mercury deposition and migration to the Earth's surface can be analyzed. It is understood that, according to user needs, the first directional wind, the second directional wind, and the third directional wind can also be winds from other directions. Here, horizontal wind refers to wind flowing horizontally, upwind is wind flowing obliquely upwards, and downwind is wind flowing obliquely downwards.

[0043] In one embodiment, the directional wind-based atmospheric mercury sampling device 100 further includes a first three-way valve 20, a second three-way valve 21, and a third three-way valve 22. The first air intake channel 13 can be connected to the first zero gas tank 11 and the first mercury collection assembly 12 via the first three-way valve 20, respectively. The second air intake channel 16 can be connected to the second zero gas tank 14 and the second mercury collection assembly 15 via the second three-way valve 21, respectively. The third air intake channel 19 can be connected to the third zero gas tank 17 and the third mercury collection assembly 18 via the third three-way valve 22, respectively. The first three-way valve 20 controls the first air intake channel 13 to connect to either the first zero gas tank 11 or the first mercury collection assembly 12, providing convenient control and a reasonable structural design. The second three-way valve 21 controls the second air intake channel 16 to connect to either the second zero gas tank 14 or the second mercury collection assembly 15, providing convenient control and a reasonable structural design. The third three-way valve 22 controls the connection between the third air intake channel 19 and one of the third zero gas tank 17 or the third mercury collection assembly 18, making control convenient and the structural design reasonable.

[0044] In one embodiment, the atmospheric mercury sampling device 100 based on directional wind further includes a control element. The first three-way valve 20, the second three-way valve 21, and the third three-way valve 22 are all solenoid valves. The control element is electrically connected to the first three-way valve 20, the second three-way valve 21, and the third three-way valve 22, respectively. The control element can control the opening and closing of each of the two ports in the first three-way valve 20, the second three-way valve 21, and the third three-way valve 22, reducing manual operation workload, improving sampling efficiency, and providing convenient and simple control. It can be applied to high-resolution continuous monitoring of atmospheric mercury isotope ratios. The control element is connected to the first three-way valve 20, the second three-way valve 21, and the third three-way valve 22 via control lines, and the control element is an electrical component that can be controlled, such as a switch.

[0045] In one embodiment, a first one-way valve 23 is provided between the first three-way valve 20 and the first intake passage 13, a second one-way valve 24 is provided between the second three-way valve 21 and the second intake passage 16, and a third one-way valve 25 is provided between the third three-way valve 22 and the third intake passage 19. The first one-way valve 23 is used to prevent backflow of gas between the first intake passage 13 and the first three-way valve 20, the second one-way valve 24 is used to prevent backflow of gas between the second intake passage 16 and the second three-way valve 21, and the third one-way valve 25 is used to prevent backflow of gas between the third intake passage 19 and the third three-way valve 22.

[0046] In one embodiment, the first mercury collection assembly 12 includes a first mercury trapping pipe 122 and a first suction pump 124, the first suction pump 124, the first mercury trapping pipe 122, and the first three-way valve 20 are connected in sequence; the second mercury collection assembly 15 includes a second mercury trapping pipe 152 and a second suction pump 154, the second suction pump 154, the second mercury trapping pipe 152, and the second three-way valve 21 are connected in sequence; the third mercury collection assembly 18 includes a third mercury trapping pipe 182 and a third suction pump 184, the third suction pump 184, the third mercury trapping pipe 182, and the third three-way valve 22 are connected in sequence. When the first mercury trapping pipe 122, the second mercury trapping pipe 152, and the third mercury trapping pipe 182 collect atmospheric mercury in different wind directions... Atmospheric mercury is obtained by heating and desorption of the first mercury collection tube 122, the second mercury collection tube 152, and the third mercury collection tube 182. The collected atmospheric mercury is then loaded into a mercury analyzer using a carrier gas for analysis of atmospheric mercury concentration and isotope ratios. Each of the first mercury collection tube 122, the second mercury collection tube 152, and the third mercury collection tube 182 includes a tube body and an adsorption block. The tube body is made of borosilicate glass, and the adsorption block is one of activated carbon, modified activated carbon, gold ingots, or gold-plated ingots.

[0047] In one embodiment, a first mass flow controller 26 is provided between the first mercury collection tube 122 and the first vacuum pump 124; a second mass flow controller 27 is provided between the second mercury collection tube 152 and the second vacuum pump 154; and a third mass flow controller 28 is provided between the third mercury collection tube 182 and the third vacuum pump 184. The first mass flow controller 26 controls the flow rate between the first vacuum pump 124 and the first mercury collection tube 122. The second mass flow controller 27 controls the flow rate between the second vacuum pump 154 ​​and the second mercury collection tube 152. The third mass flow controller 28 controls the flow rate between the third vacuum pump 184 and the third mercury collection tube 182.

[0048] In one embodiment, the first air intake channel 13, the second air intake channel 16, and the third air intake channel 19 are each provided with a filter membrane. In one embodiment, the filter membrane is a Teflon filter membrane. The pore size of the Teflon filter membrane is 0.2 micrometers. The first zero gas tank 11, the first mercury collection tube 122, the first mass flow controller 26, the first vacuum pump 124, the first one-way valve 23, and the first air intake channel 13 can be connected by a first gas pipe fitting. The second zero gas tank 14, the second mercury collection tube 152, the second mass flow controller 27, the second vacuum pump 154, the second one-way valve 24, and the second air intake channel 16 can be connected by a second gas pipe fitting. The third zero gas tank 17, the third mercury collection tube 182, the third mass flow controller 28, the third vacuum pump 184, the third one-way valve 25, and the third air intake channel 19 can be connected by a third gas pipe fitting. Among them, the first gas line fitting, the second gas line fitting, and the third gas line fitting can all be made of Teflon tubing that does not absorb mercury.

[0049] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art without departing from its scope. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. An atmospheric mercury sampling device based on directional wind, characterized in that, It includes a wind vane, a first zero gas tank, a first mercury collection assembly, a first air intake channel, a second zero gas tank, a second mercury collection assembly, and a second air intake channel; The wind vane is used to detect wind in a first direction and wind in a second direction. There is a first preset angle between the first wind and the second wind. The first air intake channel is located on the first wind and the second air intake channel is located on the second wind. It also includes a third zero gas tank, a third mercury collection assembly, and a third air intake channel. The wind vane is also used to detect a third-direction wind. There is a second preset angle between the first-direction wind and the third-direction wind, and a third preset angle between the second-direction wind and the third-direction wind. The third air intake channel is located on the third-direction wind. When the wind vane detects wind in the first direction, the first mercury collection component is connected to the first air intake channel, the first zero gas tank is not connected to the first air intake channel, the second zero gas tank is connected to the second air intake channel, the second mercury collection component is not connected to the second air intake channel, the third zero gas tank is connected to the third air intake channel, and the third mercury collection component is not connected to the third air intake channel. The first mercury collection component is used to collect atmospheric mercury in the first direction of wind, the second zero gas tank filters the air in the second direction of wind, and the third zero gas tank filters the air in the third direction of wind to prevent interference with the first air intake channel; the first mercury collection component collects atmospheric mercury in the first direction of wind, and then analyzes and studies the collected atmospheric mercury. When the anemometer detects wind from the second direction, the first mercury collection component and the first air intake channel are not connected, the first zero gas tank and the first air intake channel are connected, the second zero gas tank and the second air intake channel are not connected, the second mercury collection component and the second air intake channel are connected, the third zero gas tank and the third air intake channel are connected, and the third mercury collection component and the third air intake channel are not connected; the second mercury collection component collects atmospheric mercury from the wind from the second direction, and then analyzes and studies the collected atmospheric mercury; When the anemometer detects the third-direction wind, the first mercury collection component and the first air intake channel are not connected, the first zero gas tank and the first air intake channel are connected, the second zero gas tank and the second air intake channel are connected, the second mercury collection component and the second air intake channel are not connected, the third zero gas tank and the third air intake channel are not connected, and the third mercury collection component and the third air intake channel are connected; the third mercury collection component collects atmospheric mercury from the third-direction wind, and then analyzes and studies the collected atmospheric mercury; The first directional wind is a horizontal wind, the second directional wind is an upwind wind, and the third directional wind is a downwind wind. A horizontal wind is a wind that flows horizontally, an upwind wind is a wind that flows upward at an angle, and a downwind wind is a wind that flows downward at an angle.

2. The atmospheric mercury sampling device based on directional wind according to claim 1, characterized in that, It also includes a first three-way valve, a second three-way valve, and a third three-way valve. The first air intake channel can be connected to the first zero gas tank and the first mercury collection assembly through the first three-way valve. The second air intake channel can be connected to the second zero gas tank and the second mercury collection assembly through the second three-way valve. The third air intake channel can be connected to the third zero gas tank and the third mercury collection assembly through the third three-way valve.

3. The atmospheric mercury sampling device based on directional wind according to claim 2, characterized in that, It also includes control elements, wherein the first three-way valve, the second three-way valve, and the third three-way valve are all solenoid valves, and the control elements are electrically connected to the first three-way valve, the second three-way valve, and the third three-way valve, respectively.

4. The atmospheric mercury sampling device based on directional wind according to claim 2, characterized in that, A first check valve is provided between the first three-way valve and the first air intake channel, a second check valve is provided between the second three-way valve and the second air intake channel, and a third check valve is provided between the third three-way valve and the third air intake channel.

5. The atmospheric mercury sampling device based on directional wind according to claim 2, characterized in that, The first mercury collection assembly includes a first mercury collection tube and a first vacuum pump, wherein the first vacuum pump, the first mercury collection tube and the first three-way valve are connected in sequence. The second mercury collection assembly includes a second mercury collection pipe and a second vacuum pump, wherein the second vacuum pump, the second mercury collection pipe and the second three-way valve are connected in sequence. The third mercury collection assembly includes a third mercury collection tube and a third vacuum pump, which are connected in sequence.

6. The atmospheric mercury sampling device based on directional wind according to claim 5, characterized in that, A first mass flow controller is provided between the first mercury collection tube and the first vacuum pump, a second mass flow controller is provided between the second mercury collection tube and the second vacuum pump, and a third mass flow controller is provided between the third mercury collection tube and the third vacuum pump.

7. The atmospheric mercury sampling device based on directional wind according to any one of claims 1 to 6, characterized in that, The first air intake channel, the second air intake channel and the third air intake channel are each provided with a filter membrane.

8. The atmospheric mercury sampling device based on directional wind according to claim 7, characterized in that, The filter membrane is a Teflon filter membrane.

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