Water sample pretreatment device

Abstract

The utility model relates to the technical field of environmental monitoring, and discloses a water sample pretreatment device which comprises a table top, a brown narrow-mouthed bottle is arranged at the top of the table top, a screw cap is in threaded connection with the outer wall of the brown narrow-mouthed bottle, a rubber plug is fixedly connected in the screw cap, a guide pipe is fixedly connected in the screw cap, and a water outlet is formed in the guide pipe. One end of the guide pipe is fixedly connected with a sinker head, one end of the guide pipe is fixedly connected with a small extraction column, the bottom of the small extraction column is slidably connected with a flow control valve, the bottom of the flow control valve is in threaded connection with a cover plate, and a connecting hole is formed in the cover plate. According to the device disclosed by the utility model, through the structures such as the spiral cover and the peristaltic pump, the loss of a detected object is reduced, the extraction device is subjected to suction filtration at the flow speed of 20-25ML / min through the peristaltic pump, the opening degree of a valve does not need to be supervised and adjusted by personnel aside, the flow speed is uniform, the problems that the detected object is easy to volatilize and lose and the flow speed fluctuates are solved, and the safety of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to a water sample pretreatment device. Background Art

[0002] The detection of alkyl mercury in water usually requires a series of pretreatment steps and then the determination using appropriate analytical techniques. First, the water sample needs to be properly pretreated to concentrate the target substance and remove interfering substances. This can be achieved by solid phase extraction, solvent extraction, distillation or other appropriate methods. For the determination of alkyl mercury, chemical reactions are usually used to convert alkyl mercury into organic mercury compounds, such as methyl mercury. Alkyl mercury usually exists in the form of methyl mercury, so it needs to be converted into organic mercury compounds that are easy to analyze. The commonly used method is to react the alkyl mercury in the sample with some reagents (such as stannous chloride) to generate methyl mercury that is easy to detect. This step helps to increase the sensitivity and accuracy of the detection.

[0003] The traditional method for measuring alkyl mercury in water is usually the "Gas Chromatography Method for Determination of Alkyl Mercury in Water Quality". The advantages of this method are that the instrumentation is simple and universal, the detection hardware requirements are low, there is no need to purchase expensive equipment such as purge and trap, cold atomic fluorescence, and the subsequent equipment maintenance costs are low.

[0004] However, the technical difficulty of this method is the water sample pretreatment, because the operation steps are cumbersome; the core detection consumables "thiol cotton tube" need to be prepared by oneself, which is time-consuming and labor-intensive, and the recovery rate error is large; the concentration of the analyte in water is extremely low and has strong volatility; resulting in a large loss of the analyte in the water sample pretreatment process and poor reproducibility of the test results. Therefore, a water sample pretreatment device is proposed to solve the above problems. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a water sample pretreatment device, aiming to improve the problems in the prior art that the components to be tested are easy to volatilize over a long period of time, the speed control in the adsorption and desorption operations of alkyl mercury is not good, and the extraction is insufficient.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A water sample pretreatment device, comprising a table, a brown narrow-necked bottle is arranged on the top of the table, a screw cap is threadedly connected to the outer wall of the brown narrow-necked bottle, a rubber plug is fixedly connected inside the screw cap, a catheter is fixedly connected inside the screw cap, a sinker head is fixedly connected to one end of the catheter, an extraction column is fixedly connected to one end of the catheter, a flow control valve is slidably connected to the bottom of the extraction column, a cover plate is threadedly connected to the bottom of the flow control valve, a connecting hole is arranged inside the cover plate, a guide needle is threadedly connected to the inner wall of the connecting hole, a rubber seam is arranged at the bottom of the cover plate, a waste liquid cylinder is slidably connected to the inside of the rubber seam, a peristaltic pump is slidably connected to the outer wall of the waste liquid cylinder, the bottom of the peristaltic pump is fixedly connected to the top of the table, a support column is threadedly connected to the bottom of the cover plate, a support frame is fixedly connected to the top of the table, a multi-tube vortex oscillator is arranged on the top of the table, a knob is rotatably connected to the outer wall of the multi-tube vortex oscillator, and a placement component is arranged on the top of the table;

[0008] As a further description of the above technical solution:

[0009] The placement assembly includes a test tube and a support frame, the bottom of the support frame is arranged on the top of the table, and the outer wall of the test tube is arranged on the inner wall of the support frame;

[0010] As a further description of the above technical solution:

[0011] A fixed column is fixedly connected inside the screw cover, and a rotating block is rotatably connected to the outer wall of the fixed column;

[0012] As a further description of the above technical solution:

[0013] The outer wall of the rotating block is fixedly connected with a clamping block, and the outer wall of the clamping block is arranged on the outer wall of the brown narrow-mouth bottle;

[0014] As a further description of the above technical solution:

[0015] The inner wall of the screw cover is fixedly connected with a fixed block, and the outer wall of the fixed block is slidably connected with the outer wall of the rotating block;

[0016] As a further description of the above technical solution:

[0017] A fixing fixture is fixedly connected to the top of the multi-tube vortex oscillator, and a limiting groove is opened inside the multi-tube vortex oscillator;

[0018] As a further description of the above technical solution:

[0019] The outer wall of the multi-tube vortex oscillator is rotatably connected to a screw rod, the outer wall of the screw rod is threadedly connected to a moving frame, and the outer wall of the moving frame is slidably connected to the inside of the limiting groove;

[0020] As a further description of the above technical solution:

[0021] The outer wall of the movable frame is fixedly connected with a movable fixture, and the outer wall of the screw rod is fixedly connected with a rotating rod.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the utility model, the brown narrow-mouth bottle realizes its sealing function by covering the screw cap. When the screw cap is covered, the volatilization is blocked by the inner and outer joints and the internal rubber plug, reducing the loss of the detected object. The peristaltic pump is then used to filter the extraction device at a flow rate of 20-25ML / min. There is no need for personnel to supervise and adjust the valve opening. The flow rate is uniform, which solves the problem of easy volatile loss of the detected object and fluctuation of the flow rate, and improves the safety of the device.

[0024] 2. In the utility model, the screw cap realizes its fixing function through the card block. When the card block is slid, the fixed block, the fixed column and the rotating block are linked together to realize the fixing of the screw cap. Fixing the screw cap to the bottle mouth can ensure a more secure closure to prevent accidental opening or sample leakage. The rear moving fixture realizes its moving function through the rotating rod. When the rotating rod is rotated, the limiting groove, the screw rod and the moving frame are linked together to realize the fixing of the test tube, which can prevent the test tube from accidentally tilting or falling during the shaking process, reduce the sample leakage and damage that may be caused thereby, solve the problem of damage to the detection reagent caused by tipping, and improve the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of a water sample pretreatment device proposed by the utility model;

[0026] Figure 2 This is a schematic diagram of the structure inside the screw cover of a water sample pretreatment device proposed by the utility model;

[0027] Figure 3 This is a structural schematic diagram of the bottom of a cover plate of a water sample pretreatment device proposed by the utility model;

[0028] Figure 4 This is a structural schematic diagram of the top of a multi-tube vortex oscillator of a water sample pretreatment device proposed by the utility model.

[0029] Legend:

[0030] 1. Table; 2. Brown narrow-necked bottle; 3. Catheter; 4. Peristaltic pump; 5. Test tube; 6. Support frame; 7. Extraction column; 8. Flow control valve; 9. Waste liquid tank; 10. Sinking head; 11. Block; 12. Rotating block; 13. Fixed block; 14. Fixed column; 15. Support column; 16. Rubber seam; 17. Guide needle; 18. Multi-tube vortex oscillator; 19. Rotating rod; 20. Limiting groove; 21. Moving fixture; 22. Fixed fixture; 23. Screw; 24. Moving frame; 25. Knob; 26. Rubber plug; 27. Screw cap; 28. Cover plate; 29. ​​Connecting hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 4 The utility model provides an embodiment: a water sample pretreatment device, comprising a table 1, a brown narrow-necked bottle 2 is arranged on the top of the table 1, a screw cover 27 is threadedly connected to the outer wall of the brown narrow-necked bottle 2, a rubber plug 26 is fixedly connected inside the screw cover 27, a conduit 3 is fixedly connected inside the screw cover 27, a sinker head 10 is fixedly connected to one end of the conduit 3, an extraction column 7 is fixedly connected to one end of the conduit 3, a flow control valve 8 is slidably connected to the bottom of the extraction column 7, a cover plate 28 is threadedly connected to the bottom of the flow control valve 8, and an opening inside the cover plate 28 is fixedly connected to the sinker head 10, an extraction column 7 is fixedly connected to one end of the conduit 3, a flow control valve 8 is slidably connected to the bottom of the flow control valve 8, a cover plate 28 is threadedly connected to the bottom of the cover plate 28, and an opening inside the cover plate 28 is fixedly connected to the sinker head 10, an extraction column 7 is fixedly connected to the one end of the conduit 3, a flow control valve 8 is slidably connected to the bottom of the flow control valve 8, a cover plate 28 is threadedly connected to the bottom of the flow control valve ... A connecting hole 29 is provided, and a guide pin 17 is threadedly connected to the inner wall of the connecting hole 29, a rubber seam 16 is provided at the bottom of the cover plate 28, a waste liquid cylinder 9 is slidably connected inside the rubber seam 16, a peristaltic pump 4 is slidably connected to the outer wall of the waste liquid cylinder 9, the bottom of the peristaltic pump 4 is fixedly connected to the top of the table 1, a support column 15 is threadedly connected to the bottom of the cover plate 28, a support frame 6 is fixedly connected to the top of the table 1, a multi-tube vortex oscillator 18 is provided on the top of the table 1, a knob 25 is rotatably connected to the outer wall of the multi-tube vortex oscillator 18, and a placement component is provided on the top of the table 1;

[0033] Specifically, a brown sample bottle and a screw cap 27 with a rubber stopper 26 are used, a catheter 3 is inserted into the screw cap 27, and the other end of the catheter 3 is inserted into the mouth of an extraction column 7, which fits perfectly, so that the sample loading and adsorption process remains sealed, and then the optimal adsorption flow rate is controlled by a peristaltic pump 4 to be a fixed value. Compared with the separatory funnel, the flow rate changes due to gravity, and there is no need for personnel to supervise and adjust the valve opening, and the flow rate is uniform; a solid phase extraction column 7 corresponding to the structure of the analyte is used (a special solid phase extraction column 7 for alkyl mercury replaces a homemade thiol cotton tube), the commercially mass-produced extraction column 7 has a uniform adsorption medium layer with high adsorption efficiency and no preparation process errors, a relatively stable recovery rate, good reproducibility of test results, simplified cumbersome operations (omitting the preparation of thiol cotton tubes and the detection of the recovery rate of thiol cotton tubes, and the adsorption layer of the extraction column 7 also has the function of small solid impurities), shortening the detection time, reducing the volatilization of the sample, and then using a vortex oscillator to quickly and fully extract the component to be tested into the organic phase and separate it from the aqueous phase.

[0034] Reference Figure 1 , the placement component includes a test tube 5 and a support frame 6, the bottom of the support frame 6 is arranged on the top of the table 1, and the outer wall of the test tube 5 is arranged on the inner wall of the support frame 6;

[0035] Specifically, the cover plate 28 is placed on the top through the test tube 5 and the support frame 6 to store and access the extracted solution, and 1 ml of HCL is added for fusion, and the dripping of the solution is adjusted by the flow control valve 8.

[0036] Reference Figure 2 and Figure 4 , a fixed column 14 is fixedly connected inside the screw cover 27, and a rotating block 12 is rotatably connected to the outer wall of the fixed column 14. A clamping block 11 is fixedly connected to the outer wall of the rotating block 12. The outer wall of the clamping block 11 is arranged on the outer wall of the brown narrow-mouth bottle 2, and a fixed block 13 is fixedly connected to the inner wall of the screw cover 27. The outer wall of the fixed block 13 is slidably connected to the outer wall of the rotating block 12. A fixed fixture 22 is fixedly connected to the top of the multi-tube vortex oscillator 18. A limiting groove 20 is provided inside the multi-tube vortex oscillator 18. A screw rod 23 is rotatably connected to the outer wall of the screw rod 23. A moving frame 24 is threadedly connected to the outer wall of the screw rod 23. The outer wall of the moving frame 24 is slidably connected to the inside of the limiting groove 20. The outer wall of the moving frame 24 is fixedly connected to the moving clamp 21, and the outer wall of the screw rod 23 is fixedly connected to the rotating rod 19;

[0037] Specifically, cover the screw cap 27, drive the clamping block 11 to rotate to the bottom of the bottle mouth through the bottle mouth of the brown narrow-mouth bottle 2, and then move the rotating block 12 to the bottom of the fixed block 13 to clamp it, so that the screw cap 27 cannot be taken out, which can provide better sealing and stability, reduce the risk of accidental opening, reduce the possibility of sample leakage, and improve safety. The clamping block 11 can be moved again before it can be removed. Before sliding the test tube 5, the test tube 5 is placed between the fixed clamp 22 and the movable clamp 21, and the screw rod 23 is driven to rotate by rotating the rotating rod 19, and then the movable frame 24 is driven to move by the screw rod 23, and then the movable clamp 21 is driven by the movable frame 24 to move and clamp it. The test tube 5 can be stably placed on the oscillation device to prevent the test tube 5 from colliding with the device or other test tubes 5, reduce wear and damage to the equipment and samples, and ensure that the test tube 5 maintains a relatively fixed position during oscillation, which helps to evenly mix the sample in the test tube 5 and improve the accuracy and reproducibility of the experiment.

[0038] Working principle: Place the screw cap 27 on the outer wall of the threaded brown narrow-necked bottle 2, and at the same time, drive the block 11 connected to the screw cap 27 to rotate through the brown narrow-necked bottle 2, and then move the block 11 to the bottom of the fixed block 13 to get stuck, and then start the peristaltic pump 4, fix one end of the catheter 3 on the top of the extraction column 7, and then place the extraction column 7 on the top of the threaded flow control valve 8, and then place the flow control valve 8 inside the threaded connection hole 29, and at the same time place the guide needle 17 inside the sliding connection hole 29, and then place the cover plate 28 on the top of the waste liquid cylinder 9 through the rubber seam 16, and then use the peristaltic pump 4 to perform fixed value suction filtration on the extraction device. The eluate containing the sample can be collected. After completion, the cover plate 28 is placed on the top of the support frame 6, water and organic solvent are added, and the test object is also extracted into the test tube 5 through the flow control valve 8, and then the test tube 5 is placed on the top of the multi-tube vortex oscillator 18, and the rotating rod 19 is rotated. The fixedly connected screw rod 23 is driven to rotate by the rotating rod 19, and then the threaded movable frame 24 is driven to move by the screw rod 23, and then the fixedly connected movable clamp 21 is driven by the movable frame 24 to move to fix the test tube 5, and then the multi-tube vortex oscillator 18 is started by the knob 25. After standing, the upper acid solution is discarded, and the lower organic phase is taken for GC-ECD detection.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water sample pretreatment device, comprising a table (1), characterized in that: A brown narrow-necked bottle (2) is arranged on the top of the table (1); a screw cap (27) is threadedly connected to the outer wall of the brown narrow-necked bottle (2); a rubber plug (26) is fixedly connected to the inside of the screw cap (27); a conduit (3) is fixedly connected to the inside of the screw cap (27); a sinker head (10) is fixedly connected to one end of the conduit (3); an extraction column (7) is fixedly connected to one end of the conduit (3); a flow control valve (8) is slidably connected to the bottom of the extraction column (7); a cover plate (28) is threadedly connected to the bottom of the flow control valve (8); a connection hole (29) is opened inside the cover plate (28); the inner wall of the connection hole (29) is A guide needle (17) is threadedly connected, a rubber seam (16) is opened at the bottom of the cover plate (28), a waste liquid cylinder (9) is slidably connected inside the rubber seam (16), a peristaltic pump (4) is slidably connected to the outer wall of the waste liquid cylinder (9), the bottom of the peristaltic pump (4) is fixedly connected to the top of the table top (1), a support column (15) is threadedly connected to the bottom of the cover plate (28), the top of the table top (1) is fixedly connected to a support frame (6), a multi-tube vortex oscillator (18) is arranged on the top of the table top (1), the outer wall of the multi-tube vortex oscillator (18) is rotatably connected to a knob (25), and a placement component is arranged on the top of the table top (1).

2. A water sample pretreatment device according to claim 1, characterized in that: The placement assembly comprises a test tube (5) and a support frame (6), wherein the bottom of the support frame (6) is arranged on the top of the table (1), and the outer wall of the test tube (5) is arranged on the inner wall of the support frame (6).

3. A water sample pretreatment device according to claim 1, characterized in that: The interior of the spiral cover (27) is fixedly connected to a fixing column (14), and the outer wall of the fixing column (14) is rotatably connected to a rotating block (12).

4. A water sample pretreatment device according to claim 3, characterized in that: The outer wall of the rotating block (12) is fixedly connected with a clamping block (11), and the outer wall of the clamping block (11) is arranged on the outer wall of the brown narrow-mouth bottle (2).

5. A water sample pretreatment device according to claim 4, characterized in that: The inner wall of the screw cover (27) is fixedly connected to a fixed block (13), and the outer wall of the fixed block (13) is slidably connected to the outer wall of the rotating block (12).

6. A water sample pretreatment device according to claim 1, characterized in that: A fixing fixture (22) is fixedly connected to the top of the multi-tube vortex oscillator (18), and a limiting groove (20) is provided inside the multi-tube vortex oscillator (18).

7. A water sample pretreatment device according to claim 6, characterized in that: The outer wall of the multi-tube vortex oscillator (18) is rotatably connected to a screw rod (23), the outer wall of the screw rod (23) is threadedly connected to a movable frame (24), and the outer wall of the movable frame (24) is slidably connected to the interior of the limiting groove (20).

8. A water sample pretreatment device according to claim 7, characterized in that: The outer wall of the movable frame (24) is fixedly connected to a movable fixture (21), and the outer wall of the screw rod (23) is fixedly connected to a rotating rod (19).

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