A simultaneous extraction device for organic pollutants in water samples

Abstract

The application designs a synchronous extraction device for organic pollutants in water samples, relates to the technical field of extraction, and comprises an extraction unit, a water sample bottle fixedly connected to the top of the extraction unit, an extraction solvent bottle, an L-shaped connecting pipe arranged in the extraction solvent bottle, a quantitative sampler and a separating funnel. Through cooperation of the first liquid inlet device, equal volumes of water samples in the multiple quantitative samplers are mixed with different types of extraction solvents and enter the separating funnel to perform liquid-liquid extraction, so that classified synchronous extraction of different organic pollutants in the water samples is realized, manual operation is simplified, and the extraction efficiency of the organic pollutants is improved.

Description

Technical Field

[0001] This invention relates to the field of extraction technology, and more particularly to a device for the simultaneous extraction of organic pollutants from water samples. Background Technology

[0002] Extraction, also known as solvent extraction or liquid-liquid extraction, is a method that utilizes the difference in solubility or partition coefficient of a substance in two immiscible solvents to transfer the substance from one solvent to the other. It is commonly used for separating mixtures and is widely applied in environmental analysis, food safety testing, chemical engineering, and metallurgy. The process of separating the two immiscible liquids after extraction is called liquid-liquid extraction.

[0003] Existing technologies disclose some patent documents related to the field of extraction technology. Utility model patent with publication number CN210065237U discloses an extraction device for organic pollutants in water samples, belonging to the field of extraction technology. It includes a device body, with an operating table, a cleaning door, and a drain valve installed sequentially from top to bottom on the outer surface of the device body. Two feed inlets are penetrating through the middle of the top of the device body. This extraction device for organic pollutants in water samples is equipped with a dispersion net and a guide plate.

[0004] Current techniques typically involve adding an extraction solvent to a water sample, creating two immiscible phases. Organic pollutants are then extracted into the organic phase via liquid-liquid partitioning. However, in practice, the diverse types and chemical properties of organic pollutants in water samples necessitate the addition of appropriate extraction solvents based on the characteristics of the pollutants to be separated. Furthermore, the extraction process usually requires operators to take multiple sets of water samples in parallel and add a specific proportion of different extraction solvents to each set for the classification and extraction of organic matter. This process involves multiple manual measurements and solvent additions, which is tedious, time-consuming, and exposes operators to potentially toxic organic solvents. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a simultaneous extraction device for organic pollutants in water samples.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A simultaneous extraction device for organic pollutants in a water sample includes an extraction unit, a water sample bottle fixedly connected to the top of the extraction unit, an L-shaped connecting tube inside the extraction unit, the L-shaped connecting tube including a vertical section and a horizontal section, the vertical section passing through the extraction unit and extending to the top of the extraction unit and then fixedly connected to the bottom of the water sample bottle, the horizontal section being connected to a sealing device, and a filter device being connected to the water sample bottle.

[0008] Multiple quantitative samplers are fixedly connected to the bottom of the horizontal section. A one-way liquid inlet valve is fixedly installed at the connection between the quantitative sampler and the horizontal section. A drain pipe is fixedly connected to the bottom of the quantitative sampler. A stop valve is installed on each drain pipe. A separating funnel is fixedly connected to the bottom of the drain pipe. Multiple extraction solvent bottles are fixedly installed on the top of the extraction unit. A first liquid inlet device is connected between each extraction solvent bottle and the corresponding quantitative sampler.

[0009] The filtration device includes a mounting bracket fixedly connected to the top of the extraction unit, which has a circular hole. The water sample bottle is located below the circular hole. A clamping ring is provided above the mounting bracket. Two connecting plates are fixedly connected to the side of the clamping ring along the circumference. The bottom of each connecting plate is fixedly connected to a first limiting pin. The first limiting pin is slidably inserted into the mounting bracket. A bolt is rotatably connected to the top of the mounting bracket. The bolt is threadedly connected to one of the connecting plates.

[0010] The sealing device includes a connecting block, which is located at the opening at one end of the horizontal section. A sealing plug is fixedly connected to one end of the connecting block, and the sealing plug slides and seals inside the one end of the horizontal section.

[0011] The first liquid inlet device includes a first liquid inlet pipe and a buoyancy ring. The first liquid inlet pipe is fixedly connected to the bottom of the extraction solvent bottle. One end of the first liquid inlet pipe extends into the interior of the extraction unit and is fixedly connected to a circular shell. Both the upper and lower ends of the circular shell are provided with connecting holes. The buoyancy ring is set inside the quantitative sampler. A second liquid inlet pipe is fixedly connected inside the buoyancy ring. One end of the second liquid inlet pipe passes through the quantitative sampler and extends to the top of the quantitative sampler, and is located at the bottom of the corresponding circular shell. A sealing baffle is fixedly connected to one end of the second liquid inlet pipe. The sealing baffle is located inside the connecting hole below. A second liquid inlet device is connected to the second liquid inlet pipe.

[0012] The second liquid inlet device includes a liquid inlet hole, which is located on the side of the second liquid inlet pipe. The diameter of the liquid inlet hole and the height of the sealing baffle are the same as the height of the connecting hole. When the buoyancy ring rises to its highest point due to buoyancy, the sealing baffle is located in the connecting hole above the circular shell, and the liquid inlet hole is located at the top of the connecting hole below the circular shell. A limit ring is fixedly connected to the second liquid inlet pipe, and two second limit pins are slidably inserted on the limit ring. The second limit pins are fixedly connected to the bottom of the corresponding circular shell.

[0013] The extraction unit is internally fixedly connected to a U-shaped bracket, and multiple rotating shafts are rotatably connected to the U-shaped bracket. One end of the rotating shaft is fixedly connected to the corresponding shut-off valve shaft, and the other end of the rotating shaft is fixedly connected to a gear. A rack is slidably connected to the U-shaped bracket, and multiple gears mesh with the rack. Pull rings are fixedly connected to both ends of the rack.

[0014] Each side of the quantitative sampler is equipped with a U-shaped tube, and both ends of the U-shaped tube are fixedly connected to the corresponding side of the quantitative sampler. The U-shaped tube is rotatably connected to a connecting shaft, and multiple stirring blades are fixedly connected to the connecting shaft along the circumference. A micro motor is fixedly installed at the bottom of the U-shaped tube, and the output shaft of the micro motor is fixedly connected to the bottom end of the corresponding connecting shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By using the first liquid inlet device, different types of extraction solvents are mixed with an equal volume of water sample in the corresponding quantitative sampler for extraction, realizing the simultaneous extraction of different types of organic pollutants in the water sample, reducing manual operation in the extraction process, improving extraction efficiency, and reducing human error.

[0017] 2. Through the threaded connection between the bolts and the corresponding connecting plates, the two connecting plates drive the first limit pin to move downward along the sliding insertion of the mounting bracket, and bring the clamping ring close to the mounting bracket, thereby clamping the filter screen between the clamping ring and the top of the mounting bracket. Then, the water sample is poured in from above the filter screen. After being filtered by the filter screen, the water sample flows downward along the circular hole and enters the water sample bottle, completing the filtration of impurities in the water sample.

[0018] 3. When the second inlet pipe rises to its maximum height with the buoyancy ring, the extraction solvent inside the circular shell is transferred to the second inlet pipe and comes into contact with the water sample inside the quantitative sampler through the action of the second inlet device. At the same time, the connection between the first inlet pipe and the circular shell is blocked to prevent the extraction solvent from continuing to flow into the circular shell, so that the extraction solvent can be added quantitatively.

[0019] 4. The buoyancy ring drives the second inlet pipe to move downward. When the inlet hole moves into the connecting hole below the circular shell, the sealing baffle at the top of the second inlet pipe moves to the bottom of the connecting hole above the circular shell and releases the blockage of the connecting hole above the first inlet pipe during the continued descent, so that the extraction solvent in the extraction solvent bottle can enter the circular shell along the first inlet pipe for replenishment.

[0020] 5. The output shaft of the micro motor drives the connecting shaft to rotate in one direction, thereby causing multiple stirring blades on the connecting shaft to rotate inside the corresponding U-shaped tubes. This causes the water sample inside the U-shaped tubes to flow in one direction, and also causes the water sample inside the quantitative sampler to flow. This allows the extraction solvent inside the second inlet tube to quickly mix and extract with the water sample as it flows, thus improving the extraction efficiency of the water sample. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the first structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0023] Figure 3 This is a schematic diagram of the second structure of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B in the diagram;

[0025] Figure 5 This is a schematic diagram of the third structure of the present invention;

[0026] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C;

[0027] Figure 7 This is a schematic cross-sectional view of the quantitative sampler, the first inlet pipe, and the second inlet pipe of the present invention.

[0028] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point D;

[0029] Figure 9 This is a schematic diagram of the circular shell and the second liquid inlet pipe in the bottom position of the present invention (the circular shell has been cut out).

[0030] Figure 10 This is a schematic diagram of the structure of the circular shell and the second liquid inlet pipe in the top position of the present invention (the circular shell has been cut out).

[0031] Figure 11 This is a schematic diagram of the combined structure of the quantitative sampler and the U-tube of the present invention (the quantitative sampler and the U-tube have been cut out).

[0032] Figure 12 This is an exploded view of the L-shaped connecting pipe and sealing plug mating structure of the present invention.

[0033] In the diagram: 1. Extraction unit; 2. Water sample bottle; 3. L-shaped connecting tube; 301. Vertical section; 302. Horizontal section; 4. Quantitative sampler; 5. One-way inlet valve; 6. Drain pipe; 7. Stop valve; 8. Separating funnel; 9. Extraction solvent bottle; 10. Mounting bracket; 11. Circular hole; 12. Clamping ring; 13. Connecting plate; 14. First limiting pin; 15. Bolt; 16. Connecting block; 17. Sealing plug; 18. First inlet pipe; 19. Buoyancy ring; 20. Circular shell; 21. Connecting hole; 22. Second inlet pipe; 23. Sealing baffle; 24. Inlet hole; 25. Limiting ring; 26. Second limiting pin; 27. U-shaped bracket; 28. Rotating shaft; 29. ​​Gear; 30. Rack; 31. Pull ring; 32. U-shaped tube; 33. Connecting shaft; 34. Stirring blade; 35. Micro motor. Detailed Implementation

[0034] The following description is intended to illustrate the invention and enable those skilled in the art to implement it. The embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0035] like Figures 1 to 12 The device for simultaneous extraction of organic pollutants in a water sample includes an extraction unit 1, a water sample bottle 2 fixedly connected to the top of the extraction unit 1, an L-shaped connecting tube 3 inside the extraction unit 1, the L-shaped connecting tube 3 including a vertical section 301 and a horizontal section 302, the vertical section 301 passing through the extraction unit 1 and extending to the top of the extraction unit 1 and then fixedly connected to the bottom of the water sample bottle 2, the horizontal section 302 being connected to a sealing device, and a filter device being connected to the water sample bottle 2.

[0036] Multiple quantitative samplers 4 are fixedly connected to the bottom of the horizontal section 302. A one-way liquid inlet valve 5 is fixedly installed at the connection between the quantitative sampler 4 and the horizontal section 302. A drain pipe 6 is fixedly connected to the bottom of the quantitative sampler 4. A stop valve 7 is installed on each drain pipe 6. A separating funnel 8 is fixedly connected to the bottom of the drain pipe 6. Multiple extraction solvent bottles 9 are fixedly installed on the top of the extraction unit 1. A first liquid inlet device is connected between each extraction solvent bottle 9 and the corresponding quantitative sampler 4.

[0037] The specific working principle of this invention is as follows:

[0038] First, the water sample for extraction is poured into water sample bottle 2 and filtered through a filtration device to reduce the impact of solid particles on subsequent extraction. The water sample enters the vertical section 301 along the connection between water sample bottle 2 and L-shaped connecting tube 3, and moves towards the horizontal section 302. After entering the horizontal section 302, the water sample enters multiple quantitative samplers 4 along the connection between the horizontal section 302 and the quantitative samplers 4 until all quantitative samplers 4 are filled with water sample.

[0039] The sealing device is released from one end of the horizontal section 302, allowing the remaining water sample inside the water sample bottle 2 and the horizontal section 302 to drain out through the opening at one end of the horizontal section 302, ensuring that the volume of water sample inside each quantitative sampler 4 is the same. During the water sample collection process inside the quantitative sampler 4, the first liquid inlet device allows different types of extraction solvents in multiple extraction solvent bottles 9 to come into contact with and mix with the water sample in the corresponding quantitative sampler 4.

[0040] Then, the shut-off valve 7 is opened, allowing the water sample in the quantitative sampler 4 and the corresponding extraction solvent to flow along the drain pipe 6 into the corresponding separatory funnel 8 for liquid-liquid distribution, thereby extracting and separating the organic pollutants in the water sample. The extraction process can use different extraction solvents to extract different organic pollutants in the water sample simultaneously, improving extraction efficiency and reducing manual operation and human error.

[0041] The filtration device includes a mounting bracket 10 fixedly connected to the top of the extraction unit 1, which has a circular hole 11. The water sample bottle 2 is located below the circular hole 11. A clamping ring 12 is provided above the mounting bracket 10. Two connecting plates 13 are fixedly connected to the side of the clamping ring 12 along the circumference. A first limiting pin 14 is fixedly connected to the bottom of each connecting plate 13. The first limiting pin 14 is slidably inserted into the mounting bracket 10. A bolt 15 is rotatably connected to the top of the mounting bracket 10. The bolt 15 is threadedly connected to one of the connecting plates 13. During operation, the filter screen is placed between the mounting frame 10 and the clamping ring 12, with the filter screen positioned above the circular hole 11. Then, by rotating the bolt 15, the threaded connection between the bolt 15 and the corresponding connecting plate 13 causes the two connecting plates 13 to move the first limiting pin 14 downward along the sliding insertion point of the mounting frame 10, bringing the clamping ring 12 closer to the mounting frame 10. This clamps the filter screen between the clamping ring 12 and the top of the mounting frame 10. The water sample is then poured in from above the filter screen. After being filtered by the filter screen, the water sample flows downward along the circular hole 11 and enters the water sample bottle 2, completing the filtration of impurities in the water sample.

[0042] The sealing device includes a connecting block 16, which is located at the opening at one end of the horizontal section 302. A sealing plug 17 is fixedly connected to one end of the connecting block 16, and the sealing plug 17 slides and seals inside one end of the horizontal section 302.

[0043] During operation, the sealing plug 17 seals the opening at one end of the horizontal section 302, allowing the water sample to enter the horizontal section 302 and then flow along the connection between the horizontal section 302 and the quantitative sampler 4 into the multiple quantitative samplers 4 until all the quantitative samplers 4 are filled with water sample. Pulling the connecting block 16 causes the sealing plug 17 to detach from the opening at one end of the horizontal section 302, allowing the remaining water sample inside the water sample bottle 2 and the horizontal section 302 to be discharged through the opening at one end of the horizontal section 302.

[0044] The first liquid inlet device includes a first liquid inlet pipe 18 and a buoyancy ring 19. The first liquid inlet pipe 18 is fixedly connected to the bottom of the extraction solvent bottle 9. One end of the first liquid inlet pipe 18 extends into the interior of the extraction unit 1 and is fixedly connected to a circular shell 20. Both the upper and lower ends of the circular shell 20 are provided with connecting holes 21. The buoyancy ring 19 is disposed inside the quantitative sampler 4. A second liquid inlet pipe 22 is fixedly connected inside the buoyancy ring 19. One end of the second liquid inlet pipe 22 passes through the quantitative sampler 4 and extends to the top of the quantitative sampler 4, and is located at the bottom of the corresponding circular shell 20. A sealing baffle 23 is fixedly connected to one end of the second liquid inlet pipe 22. The sealing baffle 23 is located inside the connecting hole 21 below. A second liquid inlet device is connected to the second liquid inlet pipe 22.

[0045] During operation, when the water sample enters the quantitative sampler 4, as the height of the water sample inside the quantitative sampler 4 increases, the buoyancy ring 19 moves upward under the action of buoyancy, which in turn moves the second inlet pipe 22 upward. Part of the extraction solvent inside the extraction solvent bottle 9 fills the corresponding circular shell 20 along the first inlet pipe 18, and the sealing baffle 23 at the top of the second inlet pipe 22 seals the connecting hole 21 below the circular shell 20. Figure 8 and Figure 9 As shown, this reduces leakage of the extraction solvent. When the second inlet pipe 22 rises to its maximum height with the buoyancy ring 19, the extraction solvent inside the circular shell 20 is transferred to the second inlet pipe 22 and comes into contact with the water sample inside the quantitative sampler 4 through the action of the second inlet device. At the same time, the connection between the first inlet pipe 18 and the circular shell 20 is blocked to prevent the extraction solvent from continuing to flow into the circular shell 20, so that the extraction solvent can be added quantitatively.

[0046] The second liquid inlet device includes a liquid inlet hole 24, which is opened on the side of the second liquid inlet pipe 22. The diameter of the liquid inlet hole 24 and the height of the sealing baffle 23 are the same as the height of the connecting hole 21. When the buoyancy ring 19 rises to the highest point by buoyancy, the sealing baffle 23 is located in the connecting hole 21 above the circular shell 20, and the liquid inlet hole 24 is located at the top of the connecting hole 21 below the circular shell 20. A limit ring 25 is fixedly connected to the second liquid inlet pipe 22. Two second limit pins 26 are slidably inserted on the limit ring 25. The second limit pins 26 are fixedly connected to the bottom of the corresponding circular shell 20.

[0047] During operation, when the second inlet pipe 22 moves upward synchronously with the buoyancy ring 19, the limiting ring 25 on the second inlet pipe 22 moves along the sliding insertion of the second limiting pin 26, thereby limiting the movement of the second inlet pipe 22. The sealing baffle 23 at the top of the second inlet pipe 22 moves upward from the connecting hole 21 below the circular housing 20, and when it reaches the bottom of the connecting hole 21 above the circular housing 20, it seals the connection between the circular housing 20 and the first inlet pipe 18. At this time, the inlet hole 24 is located in the connecting hole 21 below the circular housing 20. And when the sealing baffle 23 moves completely into the connecting hole 21 above the circular housing 20 along with the second inlet pipe 22, as... Figure 10 As shown, the inlet hole 24 is located at the top of the connecting hole 21 below the circular shell 20, so that the extraction solvent inside the circular shell 20 enters the second inlet pipe 22 along the inlet hole 24 and comes into contact with the water sample inside the quantitative sampler 4 along the bottom opening of the second inlet pipe 22.

[0048] Open the stop valve 7 on the drain pipe 6, allowing the water sample inside the quantitative sampler 4 and the extraction solvent inside the second inlet pipe 22 to enter the separating funnel 8 along the drain pipe 6. As the water sample inside the quantitative sampler 4 descends, the buoyancy ring 19 drives the second inlet pipe 22 downwards. When the inlet hole 24 moves into the connecting hole 21 below the circular shell 20, the sealing baffle 23 at the top of the second inlet pipe 22 moves to the bottom of the connecting hole 21 above the circular shell 20, and releases the blockage of the connecting hole 21 above the first inlet pipe 18 during the continued descent, allowing the extraction solvent in the extraction solvent bottle 9 to enter the circular shell 20 along the first inlet pipe 18 for replenishment.

[0049] The extraction unit 1 is internally fixedly connected to a U-shaped bracket 27. Multiple rotating shafts 28 are rotatably connected to the U-shaped bracket 27. One end of the rotating shaft 28 is fixedly connected to the shaft center of the corresponding shut-off valve 7, and the other end of the rotating shaft 28 is fixedly connected to a gear 29. A rack 30 is slidably connected to the U-shaped bracket 27. Multiple gears 29 mesh with the rack 30. Both ends of the rack 30 are fixedly connected to pull rings 31.

[0050] During operation, by pulling one side of the pull ring 31, the pull ring 31 drives the rack 30 to move to one side along the sliding connection. During the movement, the rack 30 meshes with multiple gears 29, driving the multiple gears 29 to rotate in the same direction, and driving the corresponding rotating shaft 28 to rotate, thereby causing multiple stop valves 7 to rotate and open synchronously. When another pull ring 31 is pulled to move the rack 30 in the opposite direction, it drives multiple stop valves 7 to close synchronously.

[0051] A U-shaped tube 32 is provided on one side of each quantitative sampler 4. Both ends of the U-shaped tube 32 are fixedly connected to the corresponding side of the quantitative sampler 4. A connecting shaft 33 is rotatably connected inside the U-shaped tube 32. Multiple stirring blades 34 are fixedly connected to the connecting shaft 33 along the circumferential direction. A micro motor 35 is fixedly installed at the bottom of the U-shaped tube 32. The output shaft of the micro motor 35 is fixedly connected to the bottom end of the corresponding connecting shaft 33.

[0052] During operation, when the extraction solvent enters the second inlet pipe 22 through the inlet hole 24 and comes into contact with the water sample inside the quantitative sampler 4 at the bottom opening of the second inlet pipe 22, the output shaft of the micro motor 35 drives the connecting shaft 33 to rotate unidirectionally. This causes the multiple stirring blades 34 on the connecting shaft 33 to rotate inside the corresponding U-shaped tubes 32, causing the water sample inside the U-shaped tubes 32 to flow in one direction and drive the water sample inside the quantitative sampler 4 to flow as well. This allows the extraction solvent inside the second inlet pipe 22 to quickly mix and extract with the water sample as it flows, improving the extraction efficiency of the water sample.

[0053] Working principle of this invention:

[0054] First, the water sample for extraction is poured into water sample bottle 2. The water sample is then filtered through a filtration device to reduce the impact of solid particles in the water sample on subsequent extraction. The water sample then flows along water sample bottle 2 and L-shaped connecting tube 3 into multiple quantitative samplers 4. By switching on and off the sealing device, the volume of water sample inside each quantitative sampler 4 is made the same.

[0055] During the water sample collection process using the quantitative sampler 4, the first liquid inlet device allows different types of extraction solvents in multiple extraction solvent bottles 9 to come into contact with and mix with the corresponding water samples in the quantitative sampler 4. Then, the stop valve 7 is opened, allowing the water samples and extraction solvents in the quantitative sampler 4 to flow along the drain pipe 6 into the corresponding separating funnel 8 for liquid-liquid distribution, thereby extracting and separating organic pollutants from the water samples. The extraction process using the quantitative sampler 4 allows multiple equal volumes of water samples to be mixed with different extraction solvents, achieving simultaneous extraction of different organic pollutants in the water samples, reducing manual operation and human error in the extraction process, and improving the extraction efficiency of organic pollutants in the water samples.

Claims

1. A device for simultaneous extraction of organic pollutants from a water sample, comprising an extraction unit (1), characterized in that, A water sample bottle (2) is fixedly connected to the top of the extraction unit (1). An L-shaped connecting tube (3) is provided inside the extraction unit (1). The L-shaped connecting tube (3) includes a vertical section (301) and a horizontal section (302). The vertical section (301) passes through the extraction unit (1) and extends to the top of the extraction unit (1), and is fixedly connected to the bottom of the water sample bottle (2). A sealing device is connected to the horizontal section (302). A filter device is connected to the water sample bottle (2). Multiple quantitative samplers (4) are fixedly connected to the bottom of the horizontal section (302). A one-way liquid inlet valve (5) is fixedly installed at the connection between the quantitative sampler (4) and the horizontal section (302). A drain pipe (6) is fixedly connected to the bottom of the quantitative sampler (4). A stop valve (7) is installed on each drain pipe (6). A separatory funnel (8) is fixedly connected to the bottom of the drain pipe (6). Multiple extraction solvent bottles (9) are fixedly installed on the top of the extraction unit (1). A first liquid inlet device is connected between the extraction solvent bottle (9) and the corresponding quantitative sampler (4). The first liquid inlet device includes a first liquid inlet pipe (18) and a buoyancy ring (19). The first liquid inlet pipe (18) is fixedly connected to the bottom of the extraction solvent bottle (9). One end of the first liquid inlet pipe (18) extends into the interior of the extraction unit (1) and is fixedly connected to a circular shell (20). Both the upper and lower ends of the circular shell (20) are provided with connecting holes (21). The buoyancy ring (19) is set inside the quantitative sampler (4). The interior of the buoyancy ring (19) is fixedly connected to a second liquid inlet pipe (22). One end of the second liquid inlet pipe (22) passes through the quantitative sampler (4) and extends to the top of the quantitative sampler (4) and is located at the bottom of the corresponding circular shell (20). One end of the second liquid inlet pipe (22) is fixedly connected to a sealing baffle (23). The sealing baffle (23) is located inside the connecting hole (21) below. The second liquid inlet pipe (22) is connected to a second liquid inlet device. The second liquid inlet device includes a liquid inlet hole (24), which is located on the side of the second liquid inlet pipe (22). The diameter of the liquid inlet hole (24) and the height of the sealing baffle (23) are the same as the height of the connecting hole (21). When the buoyancy ring (19) rises to the highest point by buoyancy, the sealing baffle (23) is located in the connecting hole (21) above the circular shell (20), and the liquid inlet hole (24) is located at the top of the connecting hole (21) below the circular shell (20). A limit ring (25) is fixedly connected to the second liquid inlet pipe (22). Two second limit pins (26) are slidably inserted on the limit ring (25). The second limit pins (26) are fixedly connected to the bottom of the corresponding circular shell (20).

2. The simultaneous extraction device for organic pollutants in water samples according to claim 1, characterized in that, The filtration device includes a mounting bracket (10) fixedly connected to the top of the extraction unit (1), which has a circular hole (11) on it. The water sample bottle (2) is located below the circular hole (11). A clamping ring (12) is provided above the mounting bracket (10). Two connecting plates (13) are fixedly connected to the side of the clamping ring (12) along the circumferential direction. A first limiting pin (14) is fixedly connected to the bottom of each connecting plate (13). The first limiting pin (14) is slidably inserted into the mounting bracket (10). A bolt (15) is rotatably connected to the top of the mounting bracket (10). The bolt (15) is threadedly connected to one of the connecting plates (13).

3. The simultaneous extraction device for organic pollutants in water samples according to claim 1, characterized in that, The sealing device includes a connecting block (16), which is located at the opening at one end of the horizontal section (302). A sealing plug (17) is fixedly connected to one end of the connecting block (16), and the sealing plug (17) slides and seals inside one end of the horizontal section (302).

4. The simultaneous extraction device for organic pollutants in water samples according to claim 1, characterized in that, The extraction unit (1) is internally fixedly connected to a U-shaped bracket (27), and multiple rotating shafts (28) are rotatably connected to the U-shaped bracket (27). One end of the rotating shaft (28) is fixedly connected to the shaft of the corresponding shut-off valve (7), and the other end of the rotating shaft (28) is fixedly connected to a gear (29). A rack (30) is slidably connected to the U-shaped bracket (27), and multiple gears (29) mesh with the rack (30). Both ends of the rack (30) are fixedly connected to pull rings (31).

5. The simultaneous extraction device for organic pollutants in water samples according to claim 4, characterized in that, A U-shaped tube (32) is provided on one side of each quantitative sampler (4). Both ends of the U-shaped tube (32) are fixedly connected to the corresponding quantitative sampler (4). A connecting shaft (33) is rotatably connected inside the U-shaped tube (32). Multiple stirring blades (34) are fixedly connected along the circumference on the connecting shaft (33). A micro motor (35) is fixedly installed at the bottom of the U-shaped tube (32). The output shaft of the micro motor (35) is fixedly connected to the bottom end of the corresponding connecting shaft (33).

Images