Detection device for heavy metal ions and detection method thereof

Abstract

The invention relates to the technical field of water quality detection, and discloses a detection device for heavy metal ions and a detection method thereof.The detection device comprises a detection device body, a connecting line is fixedly connected to the top of the detection device body, and a probe is fixedly connected to the end, away from the detection device body, of the connecting line; a storage rack is fixedly mounted at the top of the detection workbench, the detection device main body is fixedly mounted at the top of the storage rack, and a homogenizing mechanism is arranged at the top of the detection workbench. Through the overall design of the homogenizing mechanism and the work of the driving motor, the rotating shaft can provide power for the speed increaser, the speed increaser then drives the extension shaft and the stirring blade to rapidly rotate, and the stirring blade can stir a to-be-detected solution in the inner cavity of the detection cylinder and homogenize the to-be-detected solution, so that the uniformity of the to-be-detected solution is improved. The problem that heavy metal ions are settled in a static solution due to gravity action is avoided, so that the accuracy of detection work is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water quality detection, in particular to a detection device for heavy metal ions and a detection method thereof. BACKGROUND

[0002] Detecting heavy metal ions in water is the basis of water pollution treatment and ecological environment protection, because heavy metals (such as lead, mercury, cadmium, etc.) are highly toxic and difficult to degrade, and can accumulate hazards to human health through the food chain, such as damaging the nervous system, kidneys and bones. Accurate detection of heavy metal content in water quality helps to assess the degree of pollution, optimize treatment programs, and ensure the safety of drinking water and industrial water.

[0003] In the prior art, CH3CN / H2O (9:1, v / v) mixed solvent is selected as the probe to recognize Hg 2+ The probe is usually immersed in the solution to be detected when detecting heavy metal ions in water. The solution is in a static state, and the detection work needs to be continued for a period of time. The heavy metal ions will settle in the static solution due to gravity, resulting in a decrease in ion concentration in the upper layer of the solution and an increase in ion concentration in the lower layer. The sampling point of the detection instrument may not reflect the true concentration. SUMMARY

[0004] To overcome the shortcomings of the prior art, the present application provides a detection device for heavy metal ions and a detection method thereof, which has the advantages of automatically homogenizing the solution to be detected, and solves the problem that the heavy metal ions in the static solution will settle due to gravity, thereby affecting the detection effect.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a detection device for heavy metal ions, comprising a detection device main body, a connecting line fixedly connected to the top of the detection device main body, and a probe fixedly connected to the end of the connecting line away from the detection device main body, further comprising a detection workbench, a storage rack fixedly installed on the top of the detection workbench, and the detection device main body fixedly installed on the top of the storage rack, a homogenizing mechanism provided on the top of the detection workbench, and a waste liquid temporary storage mechanism provided on the inner wall of the detection workbench.

[0006] The homogenizing mechanism comprises a support sleeve and a drive motor, the support sleeve is fixedly installed on the top of the detection workbench, a detection cylinder is fixedly installed on the inner wall of the support sleeve, a speed increaser is fixedly installed at the bottom of the detection cylinder, the drive motor is fixedly installed on the top of the detection workbench, a rotating shaft is fixedly connected to the output shaft of the drive motor, the top of the rotating shaft is fixedly connected to the input end of the speed increaser, an extension shaft is fixedly connected to the output end of the speed increaser, the extension shaft is rotatably connected to the bottom of the inner cavity of the detection cylinder, and stirring blades are fixedly installed on the outer wall of the extension shaft.

[0007] Preferably, the homogenizing mechanism further comprises a plate seat detachably connected to the top of the detection workbench, the top of the plate seat is fixedly installed with vertical blocks, the adjacent side between the two vertical blocks is fixedly installed with a track cross bar, the outer wall of the track cross bar is slidably connected with a sliding block, the two sides of the sliding block are both fixedly installed with elastic members, and the end of the elastic member away from the sliding block is fixedly connected to the outer wall of the vertical block.

[0008] Preferably, the top of the sliding block is fixedly installed with a rigid support arm, the right side of the rigid support arm is fixedly installed with a side extension arm, the end of the side extension arm away from the rigid support arm is rotatably connected with a roller, and the outer wall of the rotating shaft is fixedly sleeved with a cam.

[0009] Preferably, the end of the rigid support arm is fixedly installed with an assembly block one, one side of the assembly block one is fixedly installed with a limiting rod, the outer wall of the limiting rod is slidably connected with an assembly block two, the side surface of the assembly block two is threadedly connected with a connecting bolt, the threaded end of the connecting bolt extends into the interior of the assembly block one, and the assembly block one and the assembly block two are both provided with a fitting groove, the probe is movably inserted into the inner cavity of the fitting groove, and the inner wall of the fitting groove is fixedly connected with a rubber strip.

[0010] Preferably, the outer wall of the rigid support arm is fixedly sleeved with a sleeve, the inner wall of the sleeve is fixedly sleeved with a filter bin, the bottom of the filter bin is fixedly connected with a conical cylinder, the inner wall of the filter bin is fixedly installed with an inner supporting ring, the inner wall of the inner supporting ring is fixedly installed with a magnetic block, the top of the inner supporting ring is movably inserted with a movable ring, the top of the movable ring is fixedly installed with a handle, and the bottom of the movable ring is fixedly connected with a filter cylinder.

[0011] Preferably, the side surface of the filter bin is fixedly installed with a protruding block, the side surface of the protruding block is threadedly connected with a dismounting bolt, the inner cavity of the protruding block is movably inserted with a strip-shaped block, the threaded end of the dismounting bolt movably abuts against the outer wall of the strip-shaped block, and the end of the strip-shaped block is fixedly installed with a temporary storage cylinder.

[0012] Preferably, the waste liquid temporary storage mechanism comprises a waste liquid cylinder, the waste liquid cylinder is fixedly installed on the inner wall of the detection workbench, the top of the waste liquid cylinder is fixedly connected with a connecting pipe, the top of the connecting pipe is fixedly connected with a valve one, the valve one is fixedly connected to the bottom of the detection cylinder, and the top of the waste liquid cylinder is fixedly connected with a valve two.

[0013] Preferably, the inner wall of the waste liquid cylinder is slidably connected with a sealing sliding plate, the bottom of the sealing sliding plate is fixedly installed with a sliding arm, and the bottom of the waste liquid cylinder is provided with a through hole.

[0014] Preferably, a handle is fixedly installed at the bottom of the sliding arm, a raised frame is fixedly installed at the bottom of the waste liquid cylinder, and a positioning bolt is threaded onto the outer wall of the raised frame.

[0015] Compared with the prior art, the present invention provides a detection device and method for heavy metal ions, which has the following beneficial effects:

[0016] Through the overall design of the homogenization mechanism, the drive motor provides power to the speed increaser via the rotating shaft. The speed increaser then drives the extension shaft and stirring blades to rotate rapidly. The stirring blades agitate the test solution in the inner cavity of the detection cylinder, homogenizing the solution and preventing heavy metal ions from settling due to gravity in a static solution. This ensures the accuracy of the detection. Simultaneously, the cam drive allows the probe to move left and right. The moving probe can contact the target ions more quickly, shortening the response time, reducing local ion concentration fluctuations, ensuring sufficient binding between the probe and ions, and improving the detection limit. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram of the detection cylinder of the present invention;

[0019] Figure 3 This is a schematic diagram of the overall structure of the plate base of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of assembly block one and assembly block two of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the filter chamber and temporary storage cylinder of the present invention;

[0022] Figure 6 This is a cross-sectional structural diagram of the filter chamber of the present invention;

[0023] Figure 7 This is a schematic diagram of the waste liquid temporary storage mechanism of the present invention;

[0024] Figure 8 This is a cross-sectional structural diagram of the waste liquid cylinder of the present invention.

[0025] In the diagram: 1. Testing workbench; 11. Shelf; 12. Main body of testing device; 13. Connecting line; 14. Probe; 2. Homogenizing mechanism; 21. Support sleeve; 22. Testing cylinder; 23. Drive motor; 24. Rotating shaft; 25. Speed ​​increaser; 251. Extension shaft; 252. Stirring blade; 26. Cam; 27. Plate base; 271. Vertical block; 272. Track crossbar; 273. Elastic element; 274. Slider; 275. Rigid support arm; 2751. Side extension arm; 2752. Roller; 28. Assembly block one; 281. Limiting rod; 282. Assembly block 2. 283. Connecting bolt; 284. Fitting groove; 285. Rubber strip; 29. ​​Kit; 291. Filter chamber; 2911. Inner support ring; 2912. Magnetic block; 2913. Movable ring; 2914. Handle; 2915. Filter cartridge; 292. Protruding block; 293. Disassembly bolt; 294. Strip block; 295. Temporary storage cylinder; 296. Conical cylinder; 3. Waste liquid temporary storage mechanism; 31. Waste liquid cylinder; 32. Connecting pipe; 33. Valve one; 34. Valve two; 35. Sealing slide plate; 36. Sliding arm; 37. Through hole; 38. Protruding frame; 39. Positioning bolt. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a detection device and detection method for heavy metal ions.

[0028] A method for detecting heavy metal ions using mercury ion compounds as the identification target includes the following steps:

[0029] A fluorescent probe is provided, wherein the fluorescent probe is selected from at least one of a symmetrical phenyl-substituted tripyrazine derivative L2, a symmetrical methyl-substituted tripyrazine derivative L3, or an asymmetrical phenyl-substituted tripyrazine derivative L4.

[0030] The fluorescent probe is dissolved in a mixed solvent of organic solvent and water to form a probe solution, wherein the volume ratio of organic solvent to water is 9:1.

[0031] Mix the test solution with the probe solution, or add the test solution to the detection device containing the probe solution;

[0032] The probe solution was excited at an excitation wavelength of 350 nm, and the changes in its fluorescence signal at 457 nm, 467 nm, or 528 nm were measured.

[0033] The presence or concentration of mercury ions can be detected based on changes in fluorescence signals.

[0034] The molecular formula of the symmetrical phenyl-substituted tripyrazine derivative L2 is C92H62N12, and the molecular weight of the symmetrical methyl-substituted tripyrazine derivative L3 is 849.40 [M+H]. + The molecular formula of the asymmetric phenyl-substituted tripyrazine derivative L4 is C58H44N6.

[0035] The organic solvent is acetonitrile.

[0036] The change in fluorescence signal is fluorescence quenching.

[0037] The detection limit for mercury ions is below 5 nM.

[0038] When using compound L2, for Hg 2+ The detection limit is 3.2 nM; when using compound L3, the detection limit for Hg is [missing information]. 2+ The detection limit is 4.9 nM; when using compound L4, the detection limit for Hg is [missing information]. 2+ The detection limit is 4.2 nM.

[0039] The detection method also includes using test strips, which are impregnated with a solution containing fluorescent probes.

[0040] The detection method is applicable to the detection of mercury ions in actual water samples, including river water, lake water, or industrial wastewater.

[0041] Pyrene tripyrazine derivatives with specific structures were used as fluorescent molecular probes. These probe molecules react with mercury ions (Hg). 2+ After binding, the fluorescence signal of mercury ions changes significantly (specifically, it manifests as fluorescence quenching) due to alterations in mechanisms such as heavy atom effects and intramolecular photoinduced electron transfer (PET) or chelate fluorescence enhancement (CHEF). Qualitative and quantitative analysis of mercury ions can be achieved by measuring the degree of change in the fluorescence signal.

[0042] The fluorescent probe used is at least one of the following three pyrene tripyrazine derivatives:

[0043] Probe L2: A symmetrical phenyl-substituted tripyrazine derivative with the molecular formula C2 92 H 62 N 12 In a CH3CN / H2O (9:1, v / v) mixed solvent, the reaction of Hg... 2+ It exhibits a fluorescence quenching response, with a detection limit of up to 3.2 nM.

[0044] Probe L3: A symmetrical methyl-substituted tripyrazine derivative with a molecular weight of 849.40 [M+H]. + Under the same solvent system, for Hg 2+ The detection limit is 4.9 nM.

[0045] Probe L4: An asymmetric phenyl-substituted tripyrazine derivative with the molecular formula C0 58 H 44 N6. Under the same solvent system, for Hg 2+ The detection limit is 4.2 nM and the complexation ratio is 1:1.

[0046] Example 1:

[0047] This embodiment details the synthesis method of the fluorescent molecular probe L2, the core component for achieving highly selective mercury ion detection.

[0048] Referring to the Chinese invention patent (CN103642488B, "A Preparation Method and Application of a Multidentate Pyridine-Based Quinoxaline Fluorescent Probe") and the master's thesis from Nankai University, "Synthesis and Fluorescence Sensing Properties of Pyrene Modified Hexaazatriphenylene Derivatives", the specific steps are as follows:

[0049] Benzene hexamine (HAB) was prepared from mesitylene as a starting material via nitration and amination reactions.

[0050] Pyrene was reacted with tert-butyl chloride via Friedel-Crafts alkylation, followed by oxidation with RuCl3 / NaIO4 to yield 2,7-di-tert-butyl-4,5,9,10-pyrenetetrone (S5).

[0051] HAB was reacted with di(2-phenyl)ethylenedione in an ethanol / water solution to give intermediate S6.

[0052] Finally, under nitrogen protection, S5 (0.16 g, 0.43 mmol) and S6 (0.44 g, 0.86 mmol) were dissolved in a mixed solvent of ethanol (50 mL) and glacial acetic acid (2 mL), and the mixture was heated to reflux at 100 °C for 5 hours. After the reaction was completed, the mixture was cooled to room temperature, filtered, and washed successively with ethanol, acetone, and diethyl ether. The crude product was purified by silica gel column chromatography (eluting solvent: dichloromethane / methanol, 100 / 1 to 50 / 1, v / v gradient elution) to give a bright yellow solid L2 in approximately 39% yield.

[0053] Characterization data: 1 H NMR (300MHz, CF3COOD): δ (ppm): 1.52 (s, 18H), 7.15 (s, 8H), 7.28-7.38 (m, 16H), 7.40-7.54 (m, 16H), 9.95 (s, 4H). HRMS m / z: 1336.54[M+H] + Theoretical values ​​of elemental analysis (C) 92 H 62 N 12 •2H₂O): C, 80.56; H, 5.58; N, 12.25%. Experimental values: C, 80.41; H, 5.47; N, 12.14%.

[0054] The structure of the product was characterized and confirmed by 1H NMR, high-resolution mass spectrometry (HRMS), and elemental analysis.

[0055] Example 2:

[0056] This embodiment demonstrates how to combine the specific probe prepared in Example 1 with a detection device for heavy metal ions to achieve high-precision quantitative detection of trace mercury ions in water samples.

[0057] Mercury ions in water samples were detected using a detection device and probe L2.

[0058] Preparation stage: Prepare a concentration of 1.0 × 10⁻⁶ -5 M is a CH3CN / H2O (9:1, v / v) solution for probe L2. Check that all components of the detection device are intact and that the waste container is empty.

[0059] Sample and probe mixing: Place 3 mL of probe solution into the detection tube 22 of the detection device. Then, use a microsyringe to add an appropriate amount of the water sample to be tested (or Hg of known concentration) into the detection tube 22. 2+ The solution is used to plot a standard curve.

[0060] Initiating homogenization and detection: Close the detection cylinder cover. Start the drive motor 23, set the speed, and make the stirring blades 252 perform high-speed homogenization and stirring of the solution. At the same time, the probe oscillation mechanism starts working, driving the physical probe 14 on the connecting line to move regularly left and right below the liquid surface.

[0061] Fluorescence measurement: Start the main body of the detection device 12, set the excitation wavelength to 350nm and the emission wavelength to 457nm, and begin real-time monitoring of fluorescence intensity changes. Record the data after the signal stabilizes.

[0062] Concentration calculation: The measured fluorescence intensity value is compared with the pre-plotted Hg... 2+The concentration of mercury ions in the water sample was calculated by comparing the concentration-fluorescence quenching efficiency standard curve.

[0063] Cleaning and waste liquid treatment: After the test is completed, open valve 33 at the bottom of the test cylinder 22. The waste liquid is drawn into the waste liquid cylinder 31 for temporary storage under the action of gravity and the sealing slide plate 35. Clean the test cylinder 22 and pipeline with pure water for future use.

[0064] Example 3:

[0065] Prepare a 0.1 mM solution of probe L2 in dichloromethane. Immerse a clean chromatographic filter paper strip in this solution, ensuring it is fully wetted. After removing it, air dry it in a well-ventilated place away from light to obtain the mercury ion detection strip.

[0066] Immerse one end of the test strip in the water sample to be tested for a moment, then remove it and let it air dry slightly.

[0067] Observe the color change of the test strip under a 365nm ultraviolet lamp. If the blue fluorescence of the test strip significantly weakens or turns colorless, it indicates that the water sample contains mercury ions. Semi-quantitative analysis can be performed by comparing with a standard color chart.

[0068] Example 4:

[0069] Please see Figures 1 to 8 A detection device for heavy metal ions includes a detection device body 12, a connecting line 13 fixedly connected to the top of the detection device body 12, a probe 14 fixedly connected to the end of the connecting line 13 away from the detection device body 12, and a detection workbench 1. A shelf 11 is fixedly installed on the top of the detection workbench 1, the detection device body 12 is fixedly installed on the top of the shelf 11, a homogenizing mechanism 2 is provided on the top of the detection workbench 1, and a waste liquid temporary storage mechanism 3 is provided on the inner wall of the detection workbench 1.

[0070] The homogenizing mechanism 2 includes a support sleeve 21 and a drive motor 23. The support sleeve 21 is fixedly installed on the top of the testing workbench 1. A testing cylinder 22 is fixedly installed on the inner wall of the support sleeve 21. A speed increaser 25 is fixedly installed on the bottom of the testing cylinder 22. The drive motor 23 is fixedly installed on the top of the testing workbench 1. A rotating shaft 24 is fixedly connected to the output shaft of the drive motor 23. The top of the rotating shaft 24 is fixedly connected to the input end of the speed increaser 25. An extension shaft 251 is fixedly connected to the output end of the speed increaser 25. The extension shaft 251 is rotatably connected to the bottom of the inner cavity of the testing cylinder 22. A stirring blade 252 is fixedly installed on the outer wall of the device 1. The probe 14 is located in the inner cavity of the detection cylinder 22. The test solution is added to the inner cavity of the detection cylinder 22. The main body of the detection device 12 is started, and the heavy metal ions in the solution inside the detection cylinder 22 can be detected. The drive motor 23 is controlled to work, which can drive the rotating shaft 24 to rotate slowly. The speed increaser 25 drives the extension shaft 251 to rotate rapidly, and synchronously drives the stirring blade 252 to rotate. The stirring blade 252 will stir the test solution in the inner cavity of the detection cylinder 22, homogenize the test solution, and improve the accuracy of subsequent detection work.

[0071] Among them, such as Figure 3 As shown, the homogenizing mechanism 2 also includes a plate base 27, which is detachably connected to the top of the testing workbench 1. A block 271 is fixedly installed on the top of the plate base 27. A track bar 272 is fixedly installed between the adjacent sides of two blocks 271. A slider 274 is slidably connected to the outer wall of the track bar 272. Elastic members 273 are fixedly installed on both sides of the slider 274. The end of the elastic member 273 away from the slider 274 is fixedly connected to the outer wall of the block 271. In the initial state, the elastic force of the elastic member 273 causes the slider 274 to be located near the middle of the track bar 272.

[0072] Among them, such as Figure 1 , Figure 2 As shown, a rigid support arm 275 is fixedly installed on the top of the slider 274, and a side extension arm 2751 is fixedly installed on the right side of the rigid support arm 275. A roller 2752 is rotatably connected to the end of the side extension arm 2751 away from the rigid support arm 275. A cam 26 is fixedly sleeved on the outer wall of the rotating shaft 24. During the rotation of the rotating shaft 24, the cam 26 will rotate. During the rotation of the cam 26, the rigid support arm 275 will be pushed by the side extension arm 2751 and the roller 2752. Then, the rigid support arm 275 will be reset by the elastic force of the elastic element 273. Since the probe 14 is installed at the end of the rigid support arm 275, the probe 14 will continuously move left and right in the inner cavity of the detection tube 22. The moving probe 14 can contact the target ion more quickly, shorten the response time, reduce local ion concentration fluctuations, ensure that the probe 14 fully binds with the ion, and improve the detection limit.

[0073] Among them, such as Figure 4 As shown, an assembly block 28 is fixedly installed at the end of the rigid support arm 275. A limit rod 281 is fixedly installed on one side of the assembly block 28. An assembly block 282 is slidably connected to the outer wall of the limit rod 281. A connecting bolt 283 is threadedly connected to the side of the assembly block 282. The threaded end of the connecting bolt 283 extends into the interior of the assembly block 28. Both the assembly block 28 and the assembly block 282 have a mating groove 284. The probe 14 is movably inserted into the inner cavity of the mating groove 284. A rubber strip 285 is fixedly connected to the inner wall. When the probe 14 is installed at the end of the rigid support arm 275, the probe 14 is inserted into the mating groove 284. Then, the assembly block 282 slides on the limiting rod 281 to make the assembly block 282 fit with the assembly block 28. At this time, the connecting bolt 283 is rotated so that its end is screwed into the interior of the assembly block 28, thus completing the installation of the probe 14. The design of the rubber strip 285 can improve the stability of the probe 14 installed in the mating groove 284.

[0074] Among them, such as Figure 6 As shown, a kit 29 is fixedly sleeved on the outer wall of the rigid support arm 275, a filter chamber 291 is fixedly sleeved on the inner wall of the kit 29, a conical cylinder 296 is fixedly connected to the bottom of the filter chamber 291, an inner support ring 2911 is fixedly installed on the inner wall of the filter chamber 291, a magnetic block 2912 is fixedly installed on the inner wall of the inner support ring 2911, a movable ring 2913 is movably inserted into the top of the inner support ring 2911, a handle 2914 is fixedly installed on the top of the movable ring 2913, and a filter cartridge 291 is fixedly connected to the bottom of the movable ring 2913. 5. Before testing the solution, it needs to be filtered. Pour it into the inner cavity of the filter chamber 291. The solution will move through the filter cartridge 2915 to filter out large particulate impurities inside, avoiding the problem that large particulate impurities can easily affect the detection of heavy metal ions. The movable ring 2913 is inserted into the top of the inner support ring 2911. At the same time, the magnetic block 2912 will magnetically attract the movable ring 2913. With this design, the filter cartridge 2915 can be pulled out from the inner cavity of the filter chamber 291 directly from the handle 2914, which facilitates the cleaning work.

[0075] Among them, such as Figure 5As shown, a protrusion 292 is fixedly installed on the side of the filter chamber 291. A disassembly bolt 293 is threadedly connected to the side of the protrusion 292. A strip block 294 is movably inserted into the inner cavity of the protrusion 292. The threaded end of the disassembly bolt 293 movably abuts against the outer wall of the strip block 294. A temporary storage cylinder 295 is fixedly installed at the end of the strip block 294. The filtered solution inside the filter chamber 291 will enter the inner cavity of the temporary storage cylinder 295 for temporary storage. When the temporary storage cylinder 295 is moved for use, the disassembly bolt 293 is loosened, and then the strip block 294 is pulled out from the inside of the protrusion 292. When the cam 26 rotates, it will move the rigid support arm 275 as a whole. The temporary storage cylinder 295 will move left and right accordingly. The solution inside will be continuously homogenized due to shaking. The effect is better and the homogenization time is shorter during subsequent testing.

[0076] Among them, such as Figure 7 As shown, the waste liquid temporary storage mechanism 3 includes a waste liquid cylinder 31, which is fixedly installed on the inner wall of the detection workbench 1. A connecting pipe 32 is fixedly connected to the top of the waste liquid cylinder 31, and a valve 33 is fixedly connected to the top of the connecting pipe 32. The valve 33 is fixedly connected to the bottom of the detection cylinder 22, and a valve 34 is fixedly connected to the top of the waste liquid cylinder 31. After the solution inside the detection cylinder 22 is detected, the valve 33 is opened, and the solution can be transported through the connecting pipe 32 to the inner cavity of the waste liquid cylinder 31 for temporary storage, realizing the function of closed temporary storage and reducing the pollution of the experimental environment caused by wastewater evaporation.

[0077] Among them, such as Figure 7 , Figure 8 As shown, a sealing slide plate 35 is slidably connected to the inner wall of the waste liquid cylinder 31. A sliding arm 36 is fixedly installed at the bottom of the sealing slide plate 35. A through hole 37 is opened at the bottom of the waste liquid cylinder 31. After the valve 33 is opened, the sealing slide plate 35 will slide downward under the action of gravity, thereby generating suction from the inner cavity of the detection cylinder 22 to absorb the waste liquid into the inner cavity of the waste liquid cylinder 31.

[0078] Among them, such as Figure 7 , Figure 8 As shown, a handle is fixedly installed at the bottom of the sliding arm 36, and a raised frame 38 is fixedly installed at the bottom of the waste liquid cylinder 31. A positioning bolt 39 is threadedly connected to the outer wall of the raised frame 38. If the waste liquid needs to be discharged, the recovery pipe is connected to the valve 2 34. After opening the valve 2 34, the sealing slide plate 35 is pushed upward from the sliding arm 36 to discharge the waste liquid. If the height of the sealing slide plate 35 needs to be temporarily locked, the positioning bolt 39 is rotated to make the end of the positioning bolt 39 abut against the outer wall of the sliding arm 36.

[0079] A detection method for a heavy metal ion detection device includes the following steps:

[0080] S1. Pour the solution to be tested into the inner cavity of the filter chamber 291. The solution will move through the filter cylinder 2915 to filter out large particulate impurities inside.

[0081] S2. Loosen the disassembly bolt 293, pull the strip block 294 out from the inside of the protrusion block 292, and then pour the test solution inside the temporary storage cylinder 295 into the inner cavity of the detection cylinder 22.

[0082] S3. Control the drive motor 23 to work and drive the stirring blade 252 to rotate. The stirring blade 252 will stir the test solution in the inner cavity of the detection cylinder 22 and homogenize the test solution. The probe 14 will move left and right continuously in the inner cavity of the detection cylinder 22. The moving probe 14 can contact the target ion more quickly.

[0083] S4. The probe 14 is located in the inner cavity of the detection cylinder 22. The detection device body 12 is activated, and the heavy metal ions in the solution inside the detection cylinder 22 can be detected.

[0084] S5. After the test is completed, control valve 33 is opened, and the solution can be transported through connecting pipe 32 to the inner cavity of waste liquid cylinder 31 for temporary storage.

[0085] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A detection device for heavy metal ions, comprising a detection device body (12), wherein a connecting wire (13) is fixedly connected to the top of the detection device body (12), and a probe (14) is fixedly connected to one end of the connecting wire (13) away from the detection device body (12), characterized in that: It also includes a testing workbench (1), on the top of which a shelf (11) is fixedly installed, and the main body (12) of the testing device is fixedly installed on the top of the shelf (11). A homogenizing mechanism (2) is provided on the top of the testing workbench (1), and a waste liquid temporary storage mechanism (3) is provided on the inner wall of the testing workbench (1). The homogenizing mechanism (2) includes a support sleeve (21) and a drive motor (23). The support sleeve (21) is fixedly installed on the top of the testing workbench (1). A testing cylinder (22) is fixedly installed on the inner wall of the support sleeve (21). A speed increaser (25) is fixedly installed at the bottom of the testing cylinder (22). The drive motor (23) is fixedly installed on the top of the testing workbench (1). A rotating shaft (24) is fixedly connected to the output shaft of the drive motor (23). The top of the rotating shaft (24) is fixedly connected to the input end of the speed increaser (25). An extension shaft (251) is fixedly connected to the output end of the speed increaser (25). The extension shaft (251) is rotatably connected to the bottom of the inner cavity of the testing cylinder (22). A stirring blade (252) is fixedly installed on the outer wall of the extension shaft (251).

2. The device for detecting heavy metal ions according to claim 1, characterized in that: The homogenizing mechanism (2) also includes a plate base (27), which is detachably connected to the top of the testing workbench (1). A vertical block (271) is fixedly installed on the top of the plate base (27). A track bar (272) is fixedly installed between the adjacent sides of the two vertical blocks (271). A slider (274) is slidably connected to the outer wall of the track bar (272). An elastic element (273) is fixedly installed on both sides of the slider (274). The end of the elastic element (273) away from the slider (274) is fixedly connected to the outer wall of the vertical block (271).

3. The device for detecting heavy metal ions according to claim 2, characterized in that: A rigid support arm (275) is fixedly installed on the top of the slider (274), and a side extension arm (2751) is fixedly installed on the right side of the rigid support arm (275). A roller (2752) is rotatably connected to the end of the side extension arm (2751) away from the rigid support arm (275). A cam (26) is fixedly sleeved on the outer wall of the rotating shaft (24).

4. The device for detecting heavy metal ions according to claim 3, characterized in that: The rigid support arm (275) is fixedly installed with an assembly block one (28) at its end. A limit rod (281) is fixedly installed on one side of the assembly block one (28). An assembly block two (282) is slidably connected to the outer wall of the limit rod (281). A connecting bolt (283) is threadedly connected to the side of the assembly block two (282). The threaded end of the connecting bolt (283) extends into the interior of the assembly block one (28). Both the assembly block one (28) and the assembly block two (282) are provided with a mating groove (284). The probe (14) is movably inserted into the inner cavity of the mating groove (284). A rubber strip (285) is fixedly connected to the inner wall of the mating groove (284).

5. The device for detecting heavy metal ions according to claim 3, characterized in that: A kit (29) is fixedly sleeved on the outer wall of the rigid support arm (275). A filter chamber (291) is fixedly sleeved on the inner wall of the kit (29). A conical cylinder (296) is fixedly connected to the bottom of the filter chamber (291). An inner support ring (2911) is fixedly installed on the inner wall of the filter chamber (291). A magnetic block (2912) is fixedly installed on the inner wall of the inner support ring (2911). A movable ring (2913) is movably inserted into the top of the inner support ring (2911). A handle (2914) is fixedly installed on the top of the movable ring (2913). A filter cylinder (2915) is fixedly connected to the bottom of the movable ring (2913).

6. The device for detecting heavy metal ions according to claim 5, characterized in that: A protruding block (292) is fixedly installed on the side of the filter chamber (291). A disassembly bolt (293) is threadedly connected to the side of the protruding block (292). A strip block (294) is movably inserted into the inner cavity of the protruding block (292). The threaded end of the disassembly bolt (293) movably abuts against the outer wall of the strip block (294). A temporary storage cylinder (295) is fixedly installed at the end of the strip block (294).

7. The device for detecting heavy metal ions according to claim 1, characterized in that: The waste liquid storage mechanism (3) includes a waste liquid cylinder (31), which is fixedly installed on the inner wall of the testing workbench (1). A connecting pipe (32) is fixedly connected to the top of the waste liquid cylinder (31), and a valve one (33) is fixedly connected to the top of the connecting pipe (32). The valve one (33) is fixedly connected to the bottom of the testing cylinder (22), and a valve two (34) is fixedly connected to the top of the waste liquid cylinder (31).

8. The device for detecting heavy metal ions according to claim 7, characterized in that: A sealing slide plate (35) is slidably connected to the inner wall of the waste liquid cylinder (31), and a sliding arm (36) is fixedly installed at the bottom of the sealing slide plate (35). A through hole (37) is opened at the bottom of the waste liquid cylinder (31).

9. The device for detecting heavy metal ions according to claim 8, characterized in that: A handle is fixedly installed at the bottom of the sliding arm (36), and a raised frame (38) is fixedly installed at the bottom of the waste liquid cylinder (31). A positioning bolt (39) is threadedly connected to the outer wall of the raised frame (38).

10. A detection method for a heavy metal ion detection device, characterized in that: Includes the following steps: S1. Pour the solution to be tested into the inner cavity of the filter chamber (291). The solution will move through the filter cylinder (2915) to filter out large particulate impurities inside. S2. Loosen the disassembly bolt (293), pull the strip block (294) out from the inside of the protrusion block (292), and then pour the test solution inside the temporary storage cylinder (295) into the inner cavity of the detection cylinder (22); S3. Control the drive motor (23) to work and drive the stirring blade (252) to rotate. The stirring blade (252) will stir the test solution in the inner cavity of the detection tube (22) and homogenize the test solution. The probe (14) will move left and right continuously in the inner cavity of the detection tube (22). The moving probe (14) can contact the target ion more quickly. S4. The probe (14) is located in the inner cavity of the detection tube (22). The main body (12) of the detection device is started, and the heavy metal ions in the solution inside the detection tube (22) can be detected. S5. After the test is completed, control valve 1 (33) is opened, and the solution can be transported through the connecting pipe (32) to the inner cavity of the waste liquid cylinder (31) for temporary storage.

Images