A portable solid phase extraction device for fire rescue scene

Abstract

The present invention belongs to the technical field of fire rescue equipment, specifically a portable solid phase extraction device for fire rescue sites. It includes a vacuum pump, a waste liquid bottle, a recovery bottle, a sample bottle and a solvent bottle, which are arranged in a device box; the waste liquid bottle and the recovery bottle are provided with a gas guide interface and a liquid guide interface, the waste liquid bottle and the recovery bottle are connected through the gas guide interface, and the liquid guide interface of the waste liquid bottle can be detachably connected with the solid phase extraction column; the liquid guide interface of the recovery bottle is connected to the solid phase extraction column through the sample bottle, and then connected to the solvent bottle through the solid phase extraction column; a through cavity that can be vacuumed is formed between the bottles; when the vacuum pump is extracted, the valve interface connected to different solid phase extraction columns is adjusted to open and close, and substances in different liquids are adsorbed, eluted and collected. The advantages of the present invention are that the portable solid phase extraction device has a clever structure, high integration, simple operation, and a large sample processing capacity, which can provide strong technical support for the related work of sample detection and analysis at the fire rescue site.

Description

Technical Field

[0001] The invention belongs to the technical field of fire rescue equipment, and in particular relates to a portable solid phase extraction device for fire rescue sites. Background Art

[0002] Water is often used for fire extinguishing, hazardous chemical dilution and disinfection at fire rescue sites such as fire accidents, explosions and leaks of hazardous chemicals. In the process of using water for disposal, some characteristic target compounds at the fire rescue site will be carried into the water body. These characteristic target compounds have strong directionality. Rapid and accurate detection and identification of these compounds is of great significance for finding out the cause of the accident and effectively carrying out emergency rescue work.

[0003] However, since analytical instruments such as chromatography and mass spectrometry have special requirements for testing samples, the residual water at the fire rescue site cannot usually be directly used for detection and analysis by many scientific instruments due to its high water content and many impurities, which makes the detection and identification of compound components in the water very difficult. In this regard, the use of solid phase extraction technology to extract characteristic target compounds from the water at the fire rescue site and make them suitable for subsequent detection and analysis is an effective means to solve the above difficult problems. For water samples at the fire rescue site, the advantage of solid phase extraction technology is that it can adsorb the characteristic target compounds in the liquid sample onto the solid adsorption material, thereby separating the characteristic target compounds from the water, and then using organic reagents to elute the compounds adsorbed on the solid material to achieve the purpose of separating, extracting and enriching the characteristic target compounds.

[0004] Based on the principle of solid phase extraction technology, commercial solid phase extraction devices have been developed and produced one after another. However, the existing solid phase extraction devices have problems such as insufficient portability, small sample processing capacity, poor structural integrity, and complex processing steps, which cannot meet the needs of rapid separation and extraction of liquid samples at the fire rescue site. Therefore, it is necessary to invent a portable solid phase extraction device with ingenious structure, simple operation, and large sample processing capacity to provide strong technical support for the work related to sample detection and analysis at the fire rescue site. Summary of the invention

[0005] The object of the present invention is to provide a portable solid phase extraction device for fire rescue sites, which has an ingenious structure, high integration, simple operation and large sample processing capacity.

[0006] The portable solid phase extraction device for fire rescue scene provided by the present invention comprises a device box, a horizontal partition, a vertical partition, a partition plate, a cover assembly, a vacuum and positive pressure dual-purpose pump, a waste liquid bottle, a recovery bottle, a sample bottle and a solvent bottle;

[0007] The device box comprises a box body with an upper opening and a box cover covering the box body opening; a transverse partition is arranged at the box body opening position and covers the entire opening; a vertical partition is arranged vertically in the box body to divide the box body into a lower left space area and a lower right space area; the partition part of the transverse partition located in the lower left space area is arranged as a cover plate assembly that can be independently flipped upward; the partition plate is arranged horizontally in the lower right space area to divide the lower right space area into upper and lower spaces that are sealed and isolated from each other;

[0008] The solvent bottle is fixedly arranged on the inner side of the box cover;

[0009] The vacuum and positive pressure dual-purpose pump and the waste liquid bottle are arranged in the lower left space area of ​​the device box; the recovery bottle and the sample bottle are arranged in the lower right space area of ​​the device box, the recovery bottle is located in the lower space; the sample bottle is located in the upper space;

[0010] The waste liquid bottle is provided with two bottle body air guide interfaces and one bottle body liquid guide interface on the top; the recovery bottle is provided with a bottle body air guide interface and one bottle body liquid guide interface on the top;

[0011] The cover plate assembly is provided with a plurality of valve interfaces penetrating the cover plate assembly; an independent pluggable solid phase extraction column interface valve is provided at the upper end of the valve interface, and the lower end of the valve interface is respectively connected to a conduit, and each conduit converges into a conducting interface; the conducting interface is further connected to the bottle body liquid conducting interface of the waste liquid bottle through a conduit; in the waste liquid bottle, the bottle body liquid conducting interface is also provided with a vertical downward liquid conducting tube extending to the bottom of the waste liquid bottle;

[0012] In the waste liquid bottle, one bottle body air guide interface is connected to the air vent of the vacuum and positive pressure dual-purpose pump through a conduit; the other bottle body air guide interface is connected to the bottle body air guide interface of the recovery bottle through a conduit;

[0013] The transverse partition is located at the partition part on the lower right space area, on which a plurality of independently openable sampling glands are arranged; a plurality of soft horizontal conduits are arranged under the sampling glands, one end of each horizontal conduit corresponds to a sampling gland, and the other end of each horizontal conduit converges to another conduction interface, which is then connected to the bottle body liquid conduction interface of the recovery bottle through the conduit, and the bottle body liquid conduction interface is also provided with a vertical downward liquid conduction tube extending to the bottom of the recovery bottle;

[0014] Each of the sampling glands is provided with a sampling hole that penetrates the sampling gland, and a valve interface is provided on the sampling hole; in addition, a conducting needle and a gas guiding needle are also provided corresponding to each sampling gland;

[0015] The lower end of the conducting needle passes through the sampling hole, and the upper end of the conducting needle is connected to the solid phase extraction column interface valve through the valve interface;

[0016] The air guide needle is a hollow needle tube bent at 90 degrees, with a needle head section facing vertically downward and a needle tail section arranged horizontally, and is arranged below the sampling gland; the needle tail of the air guide needle is butted against one end of a soft horizontal conduit corresponding to the sampling gland where it is located;

[0017] The recovery bottle is arranged in the lower space of the lower right space area, and a hole is preset on the partition plate for the bottle body liquid guide interface of the recovery bottle and the catheter connected to the conduction interface to pass through;

[0018] There are several sample bottles, which are respectively arranged on the partition plate and at corresponding positions under the sampling pressure cover; the mouths of the sample bottles are provided with rubber bottle caps with sealing function, and the rubber bottle caps can be inserted and passed through by the guide needle and the gas guide needle.

[0019] In the present invention, the cover plate assembly and the sampling pressure cover are rotatably connected to the transverse partition through a rotating shaft, so that the cover plate assembly and the sampling pressure cover can cover the transverse partition and can also be flipped upward.

[0020] In the present invention, the bottle body air guide interface connected to the vacuum and positive pressure dual-purpose pump in the waste liquid bottle and the bottle body air guide interface in the recovery bottle are both provided with an anti-backflow valve (anti-liquid suction component);

[0021] The anti-backflow valve comprises a fixed box and a float; the top and bottom of the fixed box are both provided with openings; the float is arranged in the fixed box and can move up and down along the height direction of the fixed box under the action of the buoyancy of the liquid;

[0022] The top opening of the fixed box is sealed and connected with the air guide interface of the bottle body; when the waste liquid bottle and the recovery bottle are almost full of liquid, the liquid enters the fixed box from the bottom opening of the fixed box, floats the float, and when the float floats to the top of the fixed box, it can support the top opening of the sealed fixed box, thereby preventing the liquid from being sucked back into the air guide interface of the bottle body.

[0023] In the present invention, the side wall of the fixing box is also provided with a plurality of auxiliary openings to assist the liquid to flow quickly into the fixing box, and can also serve as auxiliary ventilation openings to ensure rapid passage of airflow when the vacuum and positive pressure dual-purpose pump is operating to draw a vacuum.

[0024] In the present invention, the waste liquid bottle is sealed and fixedly connected to the bottom of the recovery bottle and the bottom of the device box, and a through hole is provided at the corresponding bottom position of the two, and a bottom drain valve is provided on the through hole to empty the waste liquid in the waste liquid bottle and the recovery bottle; there is no need to take out the waste liquid bottle and the recovery bottle.

[0025] In the present invention, a silicone sleeve interface is provided on the needle body of the conducting needle, which can be squeezed and inserted into the valve interface, so as to facilitate the sealing and fixed docking of the conducting needle and the valve interface.

[0026] The present invention works as follows.

[0027] 1. Adsorption of compounds: Insert the lower end of the new solid phase extraction column into the solid phase extraction column interface valve on the cover assembly, open the solid phase extraction column interface valve on the cover assembly, and close the solid phase extraction column interface valve on the sampling gland; Pour the liquid sample collected at the fire scene directly into the column from the upper end opening of the solid phase extraction column using a container, or drain it into the solid phase extraction column through a catheter, by sealing and connecting one end of the catheter to the upper end opening of the solid phase extraction column, and inserting the other end into the liquid sample; Under the vacuum action of the vacuum and positive pressure dual-purpose pump, after the liquid sample passes through the solid phase extraction column, it passes through the solid phase extraction column interface valve, valve interface, and conduction interface in sequence into the waste liquid bottle; At the same time, the compound components in the liquid sample are adsorbed on the filler in the solid phase extraction column. If there is too much liquid in the waste liquid bottle and it is almost full of the waste liquid bottle, due to the action of the anti-backflow valve, the float floats up under the action of the liquid buoyancy and blocks the gas guide interface of the bottle body, the pump cannot draw vacuum, stops working, and waits for discharge, thereby preventing the liquid from being sucked into the vacuum and positive pressure dual-purpose pump.

[0028] 2. Elution of analytical compounds: Close the SPE column interface valve on the cover assembly, remove the SPE column with adsorbed compounds, and then insert the lower end of the SPE column into the SPE column interface valve on the sampling gland. The upper end opening of the SPE column is sealed and connected to one end of the conduit, and the other end of the conduit is inserted into the organic solvent in the solvent bottle. At this time, the liquid guide interface of the waste liquid bottle is closed.

[0029] Open the SPE column interface valve on the sampling gland, start the vacuum and positive pressure dual-purpose pump, and since the waste liquid bottle and the recovery bottle are also connected through the bottle body gas guide interface, an air flow channel for the pump to evacuate the recovery bottle is formed; the channel passes through the bottle body liquid guide interface of the recovery bottle, through the conduction interface, valve interface, SPE column interface valve, SPE column, and is connected to the solvent bottle; under the vacuuming action of the pump, the organic solvent flows from the solvent bottle through the SPE column, so that the adsorbed compounds are eluted and analyzed by the organic solvent and enter the sample bottle with the organic solvent through the conduction needle; when there is too much liquid in the sample bottle, the liquid is drawn into the recovery bottle through the gas guide needle. If the liquid in the recovery bottle is full and closed by the anti-backflow valve, the pump cannot draw vacuum, stops working, and waits for liquid discharge, thereby preventing liquid from being sucked into the waste liquid bottle.

[0030] 3. Sampling: Pull out the SPE column, SPE column interface valve and guide needle, open the sampling pressure cover and flip it upwards, pull out the gas guide needle, and take out the sample bottle for subsequent detection and analysis; because of the soft rubber gasket cover, the guide needle and gas guide needle are sealed when they are pulled out.

[0031] 4. The liquid in the waste liquid bottle and recovery bottle can flow out by opening the liquid release valve.

[0032] The remaining components can be flexibly disassembled and replaced.

[0033] The advantages of the present invention are that the portable solid phase extraction device has an ingenious structure, high integration, simple operation, and a large sample processing capacity, and provides powerful technical support for the work related to sample detection and analysis at the fire rescue site. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the present invention (reflecting the connection relationship between the components, and the size depends on the actual situation).

[0035] Figure 2 This is a schematic diagram of the anti-backflow valve structure.

[0036] Figure 3 It is a schematic diagram of the local structure of the sampling gland, rubber bottle cap, and sample bottle.

[0037] Numbers in the figure: 1 is a device box, 2 is a horizontal partition, 3 is a vertical partition, 4 is a partition plate, 5 is a cover assembly, 6 is a vacuum and positive pressure dual-purpose pump, 7 is a waste liquid bottle, 8 is a recovery bottle, 9 is a sample bottle, 10 is a solvent bottle, 11 is a bottle body gas guide interface, 12 is a bottle body liquid guide interface, 13 is a valve interface, 14 is a solid phase extraction column interface valve, 15 is a conduction interface, 16 is a sampling pressure cover, 17 is a conduction needle, 18 is a gas guide needle, 19 is a rubber bottle cap, 20 is an anti-backflow valve, 21 is a fixing box, 22 is a float, 23 is an auxiliary opening, and 24 is a solid phase extraction column. DETAILED DESCRIPTION

[0038] The present invention mainly comprises a device box 1, a horizontal partition 2, a vertical partition 3, a partition plate 4, a cover assembly 5, a vacuum and positive pressure dual-purpose pump 6, a waste liquid bottle 7, a recovery bottle 8, a sample bottle 9 and a solvent bottle 10.

[0039] The device box 1 includes a box body with an upper opening and a box cover covering the box body opening, which are made of plastic; a horizontal partition 2 is arranged at the box body opening position and covers the entire opening, and a vertical partition 3 is vertically arranged in the box body to divide the box body into a lower left space area and a lower right space area; the partition part of the horizontal partition 2 located in the lower left space area is provided with an opening, and the cover assembly 5 can be independently flipped upward to cover the opening, and the cover assembly 5 is rotatably connected to the horizontal partition 2 through a rotating shaft; the partition plate 4 is horizontally arranged in the lower right space area to divide the lower right space area into upper and lower spaces that are sealed and isolated from each other;

[0040] The solvent bottle 10 is fixedly arranged on the inner side of the box cover and fixed by a bottle body fixing buckle integrally formed with the box cover. The deformable property of the plastic of the bottle body fixing buckle is utilized for plug-in disassembly and installation.

[0041] The vacuum and positive pressure dual-purpose pump 6 and the waste liquid bottle 7 are arranged in the lower left space area of ​​the device box 1; the recovery bottle 8 is arranged in the lower space of the lower right space area of ​​the device box; the sample bottle 9 is arranged in the upper space of the lower right space area of ​​the device box, placed on the partition plate 4.

[0042] The waste liquid bottle 7 is provided with two bottle body air guide interfaces 11 and one bottle body liquid guide interface 12 on the top; the recovery bottle 8 is provided with a bottle body air guide interface 11 and one bottle body liquid guide interface 12 on the top.

[0043] The cover plate assembly 5 is provided with four valve interfaces 13 penetrating the cover plate assembly 5; an independent pluggable solid phase extraction column interface valve 14 is provided at the upper end of the valve interface 13, and the lower end of the valve interface 13 is respectively connected to a conduit, and each conduit is horizontally converged to a conduction interface 15 (the conduit can be fixed to the bottom of the cover plate assembly 5 by a conduit buckle fixedly provided under the cover plate assembly 5); the conduction interface 15 is a five-way pipe, having openings in four directions of the horizontal plane and an opening vertically downward; the vertically downward opening of the conduction interface 15 is connected to the bottle body liquid conduction interface 12 of the waste liquid bottle 7 through a conduit; in the waste liquid bottle 7, the bottle body liquid conduction interface 12 is also provided with a vertically downward liquid conduction tube extending close to the bottom of the waste liquid bottle 7;

[0044] Among them, the solid phase extraction column interface valve 14 is used to connect with the solid phase extraction column 24, and the solid phase extraction column 24 can be inserted into the valve port in a pluggable manner. The valve port is determined according to the size of the solid phase extraction column 24 currently sold on the market, and a rubber sealing ring is provided to ensure that the valve port remains sealed after the solid phase extraction column 24 is inserted.

[0045] In the waste liquid bottle 7, one bottle body air guide interface 11 is connected to the vent of the vacuum and positive pressure dual-purpose pump 6 through a conduit; the other bottle body air guide interface 11 is connected to the bottle body air guide interface 11 of the recovery bottle 8 through a conduit.

[0046] The transverse partition 2 is located at the partition part on the lower right space area, and is provided with four openings, and each corresponding opening is provided with a sampling pressure cover 16 that can be opened / closed independently, and the sampling pressure cover 16 is also rotatably connected to the transverse partition 2 through a rotating shaft; four soft horizontal conduits are arranged under each sampling pressure cover 16, and one end of each horizontal conduit corresponds to the bottom of a sampling pressure cover 16, and the other end of each horizontal conduit converges to another conducting interface 15; the conducting interface 15 is also a five-way tube; the vertically downward opening of the conducting interface 15 is then connected to the bottle body liquid conduction interface 12 of the recovery bottle 8 through a conduit, and the bottle body liquid conduction interface 12 is also provided with a vertically downward liquid conduction tube extending close to the bottom of the recovery bottle 8.

[0047] Each sampling gland 16 is provided with a sampling hole penetrating the sampling gland 16 , and a valve interface 13 is provided on the sampling hole; in addition, a conducting needle 17 and an air guiding needle 18 are provided corresponding to the lower side of each sampling gland 16 .

[0048] The lower end of the conducting needle 17 passes through the sampling hole, and the upper end of the conducting needle 17 is connected to the solid phase extraction column interface valve 14 through the valve interface 13.

[0049] The air guide needle 18 is a hollow needle tube bent at 90 degrees, with a needle head section facing vertically downward and a needle tail section arranged horizontally. The needle tail of the air guide needle 18 is connected to one end of a soft horizontal catheter under the sampling gland 16 where it is located.

[0050] The recovery bottle 8 is arranged in the lower space of the lower right space area, and a hole is preset on the partition plate 4 for the conduit connected to the bottle body liquid guide interface 12 and the conduction interface 16 of the recovery bottle 8 to pass through.

[0051] There are four sample bottles 9, which are respectively arranged on the partition plate 4 and fixed at corresponding positions under the sampling pressure cover 16; the mouth of the sample bottle 9 is provided with a rubber bottle cover 19 with a sealing function, and the rubber bottle cover 19 can be inserted and passed through by the guide needle 17 and the gas guide needle 18.

[0052] The bottle body air guide interface 11 located in the waste liquid bottle 7 and connected to the vacuum and positive pressure dual-purpose pump 6, and the bottle body air guide interface 11 in the recovery bottle 8 are both provided with an anti-backflow valve 20 (anti-liquid suction component);

[0053] The anti-backflow valve 20 includes a fixed box 21 and a float 22; a circular opening is provided at the top and bottom of the fixed box 21, and a plurality of auxiliary openings 23 are provided on the side wall of the fixed box 21; the float 22 body is cylindrical and is arranged in the fixed box 21, and the diameter of the circular cross-section is larger than the circular opening at the top of the fixed box 21, and can move up and down along the height direction of the fixed box 21 under the action of liquid buoyancy.

[0054] The top opening of the fixed box 21 is sealed and connected with the bottle gas guide interface 11; when the liquid in the waste liquid bottle 7 and the recovery bottle 8 rises to a certain height and is almost full, the liquid enters the fixed box 21 from the bottom opening of the fixed box 21 and the auxiliary opening 23, floats the float 22, and when the float 22 floats to the top of the fixed box 21, it can support the top opening of the sealed fixed box 21, thereby preventing the liquid from being sucked back into the bottle gas guide interface 11; when the vacuum and positive pressure dual-purpose pump is running to draw vacuum, the air flow can also quickly enter the fixed box 21 through the bottom opening of the fixed box 21 and the auxiliary opening 23, and flow to the docked bottle gas guide interface 11.

[0055] The waste liquid bottle 7 is sealed and fixedly connected to the bottom of the recovery bottle 8 and the bottom of the device box, and a through hole is provided at the corresponding bottom position of the two. A bottom drain valve that can be opened and closed is provided on the through hole to facilitate emptying the liquid in the waste liquid bottle 7 and the recovery bottle 8.

[0056] The guide needle 17 is provided with a silicone sleeve interface on the needle body, which can be squeezed and inserted into the valve interface to facilitate the sealing and fixed connection between the guide needle 17 and the valve interface. Various conventional sealing methods such as gluing can also be used.

[0057] The specific embodiments of the present invention are exemplified as follows.

[0058] Benzene series are an important detection target for fire rescue scene detection. This type of compound exists in many hazardous chemicals and is also a characteristic target component involved in petrochemical oil fires. After being flushed and soaked with fire-fighting water, it will be carried into the water body. The application of the present invention to benzene series in the water body at the fire scene is illustrated by an on-site example.

[0059] 1. Adsorption of compounds: Insert the lower end of the new commercial C18 solid phase extraction column into the solid phase extraction column interface valve on the cover assembly, open the solid phase extraction column interface valve on the cover assembly, and close the solid phase extraction column interface valve on the sampling pressure cap; Pour the water sample collected at the fire scene directly into the column from the upper opening of the C8 solid phase extraction column with a beaker, or it can be drained into the solid phase extraction column through a catheter, the method is to seal one end of the catheter with the upper opening of the solid phase extraction column through an adapter, and insert the other end of the catheter into the water sample; Under the vacuum action of the vacuum and positive pressure dual-purpose pump, the water sample at the fire rescue site passes through the solid phase extraction column, and then passes through the solid phase extraction column interface valve, valve interface, and conduction interface in sequence into the waste liquid bottle; At the same time, the benzene component in the water sample is adsorbed on the non-polar filler in the C18 solid phase extraction column. If there is too much water in the waste liquid bottle and it is almost full, due to the action of the backflow prevention valve, the float will float up under the buoyancy of the liquid and seal the air guide interface of the bottle. The pump cannot draw vacuum and stops working, waiting for drainage, thereby preventing liquid from being sucked into the vacuum and positive pressure dual-purpose pump.

[0060] 2. Elution of analytical compounds: Close the SPE column interface valve on the cover assembly, remove the SPE column with adsorbed compounds, and then insert the lower end of the SPE column into the SPE column interface valve on the sampling gland. The upper opening of the SPE column is sealed and connected to one end of the catheter through an adapter, and the other end of the catheter is inserted into the n-hexane solution pre-filled in the solvent bottle. At this time, the liquid guide interface of the waste liquid bottle is closed.

[0061] Open the SPE column interface valve on the sampling gland, start the vacuum and positive pressure dual-purpose pump, and since the waste liquid bottle and the recovery bottle are also connected through the bottle body gas guide interface, an air flow channel for the pump to evacuate the recovery bottle is formed; the channel passes through the bottle body liquid guide interface of the recovery bottle, through the conduction interface, valve interface, SPE column interface valve, SPE column, and through the conduit to the solvent bottle; under the vacuum action of the pump, n-hexane flows from the solvent bottle through the C18 SPE column, and the adsorbed benzene series are eluted and analyzed and enter the sample bottle with n-hexane through the conduction needle; when there is too much n-hexane solution in the sample bottle, the solution is drawn into the recovery bottle through the gas guide needle. If the solution in the recovery bottle is full, it is closed by the anti-backflow valve, the pump cannot draw vacuum, stops working, and waits for drainage, thereby preventing the liquid from being sucked into the waste liquid bottle.

[0062] 3. Sampling: Pull out the C18 solid phase extraction column, solid phase extraction column interface valve and guide needle, open the sampling pressure cover and flip it upwards, pull out the gas guide needle, and take out the sample bottle for subsequent gas chromatography / mass spectrometry detection and analysis; because of the soft rubber gasket cover, the guide needle and gas guide needle are sealed when they are pulled out.

[0063] 4. The liquid in the waste liquid bottle and recovery bottle can flow out by opening the liquid release valve.

[0064] The remaining components of the present invention (for example, baffles, pumps, various bottles, etc.) can be detachably connected through conventional snap-fit ​​structures or plug-in structures in the art, so as to achieve flexible disassembly and replacement, and facilitate the removal of various components for sampling, replacement or cleaning and maintenance.

[0065] The advantages of the present invention are that the portable solid phase extraction device has an ingenious structure, high integration, simple operation, and a large sample processing capacity, and can provide powerful technical support for sample detection and analysis related work at fire rescue sites.

[0066] Although the above methods are illustrated and described as a series of structures for simplicity of explanation, it should be understood and appreciated that these methods are not specifically limited because according to one or more embodiments, some structures may occur in different orders and / or concurrently with other actions from those illustrated and described herein or not illustrated and described herein but understandable to those skilled in the art.

[0067] The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A portable solid phase extraction device for fire rescue scene, characterized in that: It includes a device box, a horizontal partition, a vertical partition, a partition plate, a cover assembly, a vacuum and positive pressure dual-purpose pump, a waste liquid bottle, a recovery bottle, a sample bottle and a solvent bottle; The device box comprises a box body with an upper opening and a box cover covering the box body opening; a transverse partition is arranged at the box body opening position and covers the entire opening; a vertical partition is arranged vertically in the box body to divide the box body into a lower left space area and a lower right space area; the partition part of the transverse partition located in the lower left space area is arranged as a cover plate assembly that can be independently flipped upward; the partition plate is arranged horizontally in the lower right space area to divide the lower right space area into upper and lower spaces that are sealed and isolated from each other; The solvent bottle is fixedly arranged on the inner side of the box cover; The vacuum and positive pressure dual-purpose pump and the waste liquid bottle are arranged in the lower left space area of ​​the device box; the recovery bottle and the sample bottle are arranged in the lower right space area of ​​the device box, the recovery bottle is located in the lower space, and the sample bottle is located in the upper space; The waste liquid bottle is provided with two bottle body air guide interfaces and one bottle body liquid guide interface on the top; the recovery bottle is provided with a bottle body air guide interface and one bottle body liquid guide interface on the top; The cover plate assembly is provided with a plurality of valve interfaces penetrating the cover plate assembly; an independent pluggable solid phase extraction column interface valve is provided at the upper end of the valve interface, and the lower end of the valve interface is respectively connected to a conduit, and each conduit converges into a conducting interface; the conducting interface is further connected to the bottle body liquid conducting interface of the waste liquid bottle through a conduit; in the waste liquid bottle, the bottle body liquid conducting interface is also provided with a vertical downward liquid conducting tube extending to the bottom of the waste liquid bottle; In the waste liquid bottle, one bottle body air guide interface is connected to the air vent of the vacuum and positive pressure dual-purpose pump through a conduit; the other bottle body air guide interface is connected to the bottle body air guide interface of the recovery bottle through a conduit; The transverse partition is located at the partition part on the lower right space area, on which a plurality of independently openable sampling glands are arranged; a plurality of soft horizontal conduits are arranged under the sampling glands, one end of each horizontal conduit corresponds to a sampling gland, and the other end of each horizontal conduit converges to another conduction interface, which is then connected to the bottle body liquid conduction interface of the recovery bottle through the conduit, and the bottle body liquid conduction interface is also provided with a vertical downward liquid conduction tube extending to the bottom of the recovery bottle; Each of the sampling glands is provided with a sampling hole that penetrates the sampling gland, and a valve interface is provided on the sampling hole; in addition, a conducting needle and a gas guiding needle are also provided corresponding to each sampling gland; The lower end of the conducting needle passes through the sampling hole, and the upper end of the conducting needle is connected to the solid phase extraction column interface valve through the valve interface; The air guide needle is a hollow needle tube bent at 90 degrees, with a needle head section facing vertically downward and a needle tail section arranged horizontally, and is arranged below the sampling gland; the needle tail of the air guide needle is butted against one end of a soft horizontal conduit corresponding to the sampling gland where it is located; The recovery bottle is arranged in the lower space of the lower right space area, and a hole is preset on the partition plate for the catheter connected to the bottle body liquid guide interface and the conduction interface of the recovery bottle to pass through; There are several sample bottles, which are respectively arranged on the partition plate and at corresponding positions under the sampling cover; the mouths of the sample bottles are provided with rubber bottle caps with sealing function, and the rubber bottle caps can be inserted and passed through by the guide needle and the gas guide needle; The cover plate assembly and the sampling pressure cover are rotatably connected to the transverse partition through a rotating shaft, so that the cover plate assembly and the sampling pressure cover can be covered on the transverse partition and can also be flipped upwards; Anti-backflow valves are provided at the bottle body air guide interface in the waste liquid bottle that is connected to the vacuum and positive pressure dual-purpose pump and at the bottle body air guide interface in the recovery bottle; The anti-backflow valve comprises a fixed box and a float; the top and bottom of the fixed box are both provided with openings; the float is arranged in the fixed box and can move up and down along the height direction of the fixed box under the action of the buoyancy of the liquid; The top opening of the fixing box is sealed and connected with the air guide interface of the bottle body; when the waste liquid bottle and the recovery bottle are almost full of liquid, the liquid enters the fixing box from the bottom opening of the fixing box, floats the float, and when the float floats to the top of the fixing box, it can support the top opening of the sealed fixing box, thereby preventing the liquid from being sucked back into the air guide interface of the bottle body; The side wall of the fixing box is also provided with a plurality of auxiliary openings to assist the liquid to flow quickly into the fixing box, and can also serve as auxiliary ventilation openings when the vacuum and positive pressure dual-purpose pump is operating to draw a vacuum, so as to ensure the rapid passage of airflow.

2. The portable solid phase extraction device according to claim 1, characterized in that: The waste liquid bottle and the bottom of the recovery bottle and the bottom of the device box are sealed and fixedly connected, and a through hole is provided at the corresponding bottom position of the two, and a bottom drain valve is provided on the through hole to empty the waste liquid bottle and the recovery bottle; there is no need to take out the waste liquid bottle and the recovery bottle.

3. The portable solid phase extraction device according to claim 2, characterized in that: The guide needle body is provided with a silicone ferrule interface, which can be squeezed and inserted into the valve interface to facilitate the sealing and fixed docking of the guide needle and the valve interface.

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