Cadmium ion enrichment and detection device

Abstract

The invention relates to an enrichment and detection device for cadmium ions. The enrichment and detection device comprises an electrochemical electrolytic tank and a main control box, the main control box is used for controlling the work of the electrochemical electrolytic tank, and the electrochemical electrolytic tank comprises an electrolytic tank cavity, and a graphite electrode, a fluorescent optical fiber probe and a net-shaped glassy carbon electrode which are arranged in the electrolytic tank cavity. Wherein the graphite electrode is fixed through a bracket at the top of the electrolytic tank cavity, and the bottom of the graphite electrode is in contact with the bottom of the electrolytic tank cavity; the net-shaped glassy carbon electrode is fixed through a support at the top of the electrolytic tank cavity, the bottom and the two sides of the net-shaped glassy carbon electrode are in contact with the electrochemical electrolytic tank, the net-shaped glassy carbon electrode and the graphite electrode are arranged at intervals to form a closed loop, and the net-shaped glassy carbon electrode is used for enrichment and electrolysis of cadmium ions; and the fluorescent optical fiber probe is suspended and fixed in the cavity of the electrolytic tank and is used for measuring the concentration of cadmium ions. The invention provides an instant, efficient, simple and convenient device for dynamically monitoring cadmium ions on site, and the ever-increasing environmental monitoring requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of cadmium ion detection, in particular to a cadmium ion enrichment and detection device. Background Art

[0002] With the increasing severity of heavy metal pollution, especially cadmium ions, a highly toxic and difficult-to-degrade heavy metal, cadmium ions can not only harm organisms through the food chain but also cause various diseases. Therefore, real-time monitoring of cadmium ion concentrations in the environment has become particularly important for protecting the natural environment and human health.

[0003] Currently, a wide variety of methods exist for detecting cadmium ions, including atomic absorption spectroscopy, emission spectroscopy, X-ray fluorescence spectroscopy, and inductively coupled plasma spectroscopy, among other high-precision instruments. While these methods can provide accurate results, they are often time-consuming and require complex sample preparation, specialized technicians, and specialized laboratory facilities. This results in high costs and makes them unsuitable for widespread adoption.

[0004] Furthermore, some dynamic monitoring instruments currently available on the market, such as those based on dithizone spectrophotometry, while lightweight, are typically large, difficult to port, and require constant consumption of colorimetric reagents, creating an additional environmental impact. Online detection systems based on anodic stripping voltammetry or polarography, while simple in design, often suffer from interferences in the sample, resulting in poor selectivity and inability to achieve true online monitoring.

[0005] Portable cadmium ion detectors have a certain degree of mobility and can perform instantaneous measurements, but they often require manual operation, and it is difficult to ensure the continued accuracy of the results during the measurement process.

[0006] Therefore, existing detection methods still exhibit shortcomings such as complex operation, expensive equipment, and lack of portability. Improvements are necessary to meet the requirements of on-site analysis for simplicity and low cost. Summary of the Invention

[0007] In the prior art, existing detection methods still exhibit disadvantages such as complex operation, expensive equipment, and insufficient portability. Therefore, the present invention provides a cadmium ion enrichment and detection device for solving the above problems.

[0008] To achieve the above-mentioned object, the present invention provides a cadmium ion enrichment and detection device, which includes an electrochemical electrolytic cell and a main control box, wherein the main control box is used to control the operation of the electrochemical electrolytic cell, and the electrochemical electrolytic cell includes an electrolytic cell cavity, and a graphite electrode, a fluorescent fiber probe and a meshed glassy carbon electrode arranged inside the electrolytic cell cavity, wherein: The graphite electrode is fixed by a bracket on the top of the electrolytic cell cavity, and the bottom is in contact with the bottom of the electrolytic cell cavity; The mesh glassy carbon electrode is fixed by a bracket on the top of the electrolytic cell cavity, and the bottom and both sides are in contact with the electrochemical electrolytic cell. The mesh glassy carbon electrode and the graphite electrode are spaced apart to form a closed loop. The mesh glassy carbon electrode is used for the enrichment and electrolysis of cadmium ions; The fluorescent fiber optic probe is suspended and fixed in the electrolytic cell cavity and is used to measure the concentration of cadmium ions.

[0009] In one implementation, the electrochemical electrolytic cell further includes a stirring fan blade, which is arranged at the bottom of the electrolytic cell cavity and is used to mix the cadmium ions in the electrolytic cell cavity during electrolysis of the cadmium ions.

[0010] In one implementation, the electrochemical cell further includes an overflow drain hole, which is disposed at the upper end of the electrolytic cell cavity and is used to maintain a constant volume of the aqueous solution in the cell.

[0011] In one implementation, the electrochemical electrolytic cell further includes a water flow switch, an interface of which is connected to the bottom of the electrolytic cell cavity, and the water flow switch is used to control the discharge of the sample to be tested in the electrolytic cell cavity.

[0012] In one implementation, the main control box is fitted onto the back of the electrolytic cell cavity to form an integrated structure. The main control box includes an integrated circuit main control board and a touch display screen. The touch display screen is connected to the integrated circuit main control board for adjusting parameters and displaying monitoring data. The integrated circuit main control board is used to control the operation of the entire device.

[0013] In one implementation, the main control box further includes a flow-type peristaltic pump and a sampling port, the sampling port is connected to the flow-type peristaltic pump, and the flow-type peristaltic pump is used to measure and control the flow volume of the sample to be tested.

[0014] In one implementation, the mesh glassy carbon electrode has a thickness of 5 to 10 mm and a pore size of 30 to 60 PPI. The graphite electrode has a thickness of 3 to 8 mm.

[0015] In one implementation, the detection range of the fluorescent fiber optic probe is 0.005 to 0.05 mg / L.

[0016] Beneficial effects: The cadmium ion enrichment and detection device provided by the present invention obtains the precise concentration of low-concentration cadmium ions in water by combining an electrochemical electrolytic cell to enrich and electrolyze cadmium ions and a fluorescent fiber optic probe to detect cadmium ions. The device combines the efficient enrichment and electrolysis capabilities of the electrochemical electrolytic cell with the high specificity and high precision advantages of fluorescent sensing detection. No other reagents need to be consumed, and the detection sensitivity and accuracy are high, and the anti-interference ability is strong. In addition, the device is small in size, simple in structure, low in power consumption, and controllable in cost, and can meet the needs of fixed-point on-site dynamic monitoring. The present invention can adjust the flow volume of the sample to be tested through an injection-enrichment-discharge flow mode, resulting in a larger measurement volume and higher reliability. It can realize quantitative detection and long-term dynamic monitoring of cadmium ions, and provide an instant, efficient and simple on-site dynamic monitoring device for cadmium ions to meet the growing demand for environmental monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the cadmium ion enrichment and detection device provided by the present invention; Figure 2 yes Figure 1 The front structure diagram of the main control box is shown in FIG.

[0018] Among them, each number represents: 1. Overflow drain hole; 2. Electrochemical cell; 3. Graphite electrode; 4. Water flow switch; 5. Fluorescent fiber optic probe; 6. Mesh glassy carbon electrode; 7. Integrated circuit main control board; 8. Touch screen; 9. Stirring fan blades; 10. Main control box; 11. Flow peristaltic pump; 12. Sample inlet.

[0019] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the descriptions of the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" described below mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0021] See also Figure 1 and Figure 2, Figure 1 This is a schematic diagram of the overall structure of the cadmium ion enrichment and detection device provided by the present invention. Figure 2 yes Figure 1 The front structure diagram of the main control box is shown in FIG.

[0022] The present invention provides a cadmium ion enrichment and detection device, which includes an electrochemical cell 2 and a main control box 10, wherein the main control box 10 is used to control the operation of the electrochemical cell 2. The electrochemical cell 2 includes an electrolytic cell cavity, and a graphite electrode 3, a fluorescent fiber probe 5, and a meshed glassy carbon electrode 6 arranged inside the electrolytic cell cavity.

[0023] The graphite electrode 3 is fixed by a bracket at the top of the electrolytic cell cavity, with its bottom in contact with the bottom of the electrolytic cell cavity. The meshed glassy carbon electrode 6 is fixed by a bracket at the top of the electrolytic cell cavity, with its bottom and both sides in contact with the electrochemical electrolytic cell. The meshed glassy carbon electrode 6 is spaced apart from the graphite electrode 3 to form a closed loop. The meshed glassy carbon electrode 6 is used for the enrichment and electrolysis of cadmium ions. Preferably, the dimensions of the graphite electrode 3 are 60x150mm (width x height), and the thickness of the graphite electrode 3 is 3-8mm; the dimensions of the meshed glassy carbon electrode 6 are 100x200mm (width x height), and the thickness of the meshed glassy carbon electrode is 5-10mm. Its pore size is 30-60PPI, which can optimize the surface area of ​​the electrochemical reaction and the smoothness of the fluid passing through the electrode, increase contact with cadmium ions, and improve enrichment efficiency. The present invention uses the basic structure of an electrochemical cell to achieve the enrichment and electrolysis of cadmium ions through the interaction between the graphite electrode 3 and the meshed glassy carbon electrode 6. The combination of the graphite electrode 3 and the meshed glassy carbon electrode 6 forms an efficient closed circuit, thereby improving the enrichment efficiency of cadmium ions.

[0024] Specifically, the fluorescent fiber optic probe 5 is suspended and fixed in the electrolytic cell cavity to measure the concentration of cadmium ions. Furthermore, the fluorescent fiber optic probe 5 is arranged between the graphite electrode 3 and the mesh glassy carbon electrode 6. The fluorescent fiber optic probe 5 is used to monitor the concentration of cadmium ions in real time with high sensitivity and selectivity.

[0025] The electrochemical cell 2 further includes a stirring blade 9, which is disposed at the bottom of the cell cavity and is used to mix the cadmium ions in the cell cavity during electrolysis. The stirring blade 9 can effectively mix the cadmium ions in the cell, avoid uneven detection due to precipitation or stratification, and contribute to improving the efficiency and accuracy of the electrolysis process.

[0026] The electrochemical cell 2 also includes an overflow drain hole 1 and a water flow switch 4. The overflow drain hole 1 is arranged at the upper end of the electrolytic cell cavity and is used to maintain the constant volume of the aqueous solution in the cell. The interface of the water flow switch 4 is connected to the bottom of the electrolytic cell cavity, and the water flow switch 4 is used to control the discharge of the sample to be tested in the electrolytic cell cavity. The setting of the water flow switch 4 facilitates the control of the discharge of the sample to be tested, facilitates the replacement of samples and improves the continuity of detection, thereby ensuring the detection efficiency. In one embodiment, the size of the electrochemical cell 2 is 100x100x250mm (length x width x height), and the minimum sample volume is ≥500mL. The overflow drain hole 1 is at a distance from the top of the electrochemical cell 2 to ensure that the loading volume in the cell is constant at 2L. The water flow switch 4 is kept open. When the sample volume is ≤ 2L, it is closed before sample injection is completed to ensure that the sample volume in the pool is constant at 500mL. When the sample volume is greater than 2L, it is closed before sample injection is completed to ensure that water flows out of the overflow drain hole 1. When the fluorescent fiber optic probe 5 is measuring concentration, the water flow switch 4 is in the closed state.

[0027] Specifically, the main control box 10 is fitted with the back of the electrolytic cell cavity to form an integrated structure. The main control box 10 includes an integrated circuit main control board 7, a touch screen display 8, a flow-type peristaltic pump 11 and an injection port 12. Among them, the touch screen display 8 is connected to the integrated circuit main control board 7 for adjusting parameters and displaying monitoring data, and the integrated circuit main control board 7 is used to control the operation of the entire device. The injection port 12 is connected to the flow-type peristaltic pump 11, which is used to measure and control the flow volume of the sample to be tested. When cleaning the pool, the flow-type peristaltic pump 11 works normally, the flow rate is adjustable, the water flow switch remains normally open, and the other components do not work. The pool cleaning can be completed by controlling the peristaltic pump 11 to continuously inject aqueous solution to ensure that there is no residue in the secondary measurement pool. The combination of the integrated circuit main control board 7 and the touch screen display 8 makes parameter adjustment and data monitoring more convenient. The integrated circuit main control board 7 is responsible for the operation control of the entire device, reducing the failure rate. The use of the flow-type peristaltic pump 11 allows for accurate measurement and control of the volume of the sample to be tested, ensuring accurate input of the sample amount in the detection of cadmium ions, thereby improving the repeatability and reliability of the detection.

[0028] Preferably, the diameter of the injection port 12 is 8 to 16 mm. The touch screen display 8 is connected to a remote monitoring system to complete the setting of various parameters, the control device operates normally according to the set program, and the final result is displayed. The present invention converts the fluorescence intensity detected by the flow volume and the constant volume in the pool. For example, the constant volume in the pool V1, the fluorescence intensity A and the cadmium ion concentration The linear relationship is A=b + t (b is the coefficient of the first term, t is the constant term), then the cadmium ion concentration corresponding to the flow volume V is ,according to , converted to obtain the cadmium ion concentration of the test sample : The fluorescent fiber optic probe can be a product with existing technology on the market or a new fluorescent fiber optic probe independently developed. The detection range of the entire device is: 0.0005~0.05mg / L, and the time to complete a measurement is adjustable from 5 to 15 minutes.

[0029] Specifically, the integrated circuit main control board 7 is used to control the forward and reverse voltage application and time of the graphite electrode 3, the opening and closing of the fluorescent fiber optic probe 5 and signal acquisition, the opening and closing of the water flow switch 4, the rotation of the stirring blades 9, the start and stop of the flow peristaltic pump 11, as well as metering, positioning, wireless data transmission, and display and control of the touch screen 8.

[0030] The working principle of the cadmium ion enrichment and detection device provided by the present invention is: When the sample volume is ≤2L, the water flow switch 4 is initially kept in the open state, and the flow peristaltic pump 11 starts to inject the sample to be tested into the electrochemical electrolytic cell 2, while applying a forward voltage to the meshed glassy carbon electrode 6 to enrich the cadmium ions on the surface. When 500mL of residual volume is left, the water flow switch 4 is closed. After the sample addition is completed, the meshed glassy carbon electrode 6 converts the reverse voltage to electrolysis, and the enriched cadmium is redissolved in the electrochemical electrolytic cell 2. The stirring blade 9 starts working. After the electrolysis is completed, the fluorescent fiber optic probe 5 starts measuring. After the measurement is completed, the data is sent to the remote monitoring system for processing and display or displayed by the touch screen 8, and the fluorescent fiber optic probe 8 and the stirring blade 9 stop working; When the sample volume is greater than 2L, the water flow switch 4 initially remains in the open state, and the flow-type peristaltic pump 11 starts to inject the sample to be tested into the electrochemical electrolytic cell 2 while applying a positive voltage to the meshed glassy carbon electrode 6, closing the water flow switch 4 in advance to ensure that the injected sample to be tested can flow out from the overflow drain hole 1, and the subsequent steps are the same. After completing one measurement, the water flow switch 4 is turned on to discharge the test sample, and the flow-type peristaltic pump 11 increases the speed to rinse the electrochemical electrolytic cell 2 to ensure that there is no residue in the secondary measurement. The same steps are repeated for the second measurement. Through the remote monitoring system equipped with this device, the concentration of the corresponding cadmium ions in the water body can be calculated by the fluorescence intensity and output in the form of data and charts, thereby realizing real-time online monitoring of the cadmium ion concentration of the sample to be tested, and remote monitoring and adjustment of the operation of the device.

[0031] In summary, the cadmium ion enrichment and detection device provided by the present invention obtains the precise concentration of low-concentration cadmium ions in water by combining an electrochemical electrolytic cell to enrich and electrolyze cadmium ions and a fluorescent fiber optic probe to detect cadmium ions. The efficient enrichment and electrolysis capabilities of the electrochemical electrolytic cell are combined with the high specificity and high precision advantages of fluorescent sensing detection. No other reagents need to be consumed, the detection sensitivity and accuracy are high, and the anti-interference ability is strong. In addition, the device is small in size, simple in structure, low in power consumption, and controllable in cost, which can meet the needs of fixed-point on-site dynamic monitoring. The present invention can adjust the flow volume of the sample to be tested through the injection-enrichment-discharge flow mode, and the measurement volume is larger and the reliability is higher. It can realize quantitative detection and long-term dynamic monitoring of cadmium ions, and provide an instant, efficient and simple on-site dynamic monitoring device for cadmium ions to meet the growing demand for environmental monitoring.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A cadmium ion enrichment and detection device, characterized in that, It includes an electrochemical cell and a main control box, wherein the main control box is used to control the operation of the electrochemical cell. The electrochemical cell includes an electrolytic cell cavity, and a graphite electrode, a fluorescent fiber probe and a meshed glassy carbon electrode arranged inside the electrolytic cell cavity, wherein: The graphite electrode is fixed by a bracket on the top of the electrolytic cell cavity, and the bottom is in contact with the bottom of the electrolytic cell cavity; The mesh glassy carbon electrode is fixed by a bracket on the top of the electrolytic cell cavity, and the bottom and both sides are in contact with the electrochemical electrolytic cell. The mesh glassy carbon electrode and the graphite electrode are spaced apart to form a closed loop. The mesh glassy carbon electrode is used for the enrichment and electrolysis of cadmium ions; The fluorescent fiber optic probe is suspended and fixed in the electrolytic cell cavity and is used to measure the concentration of cadmium ions.

2. The enrichment and detection device of cadmium ions according to claim 1, wherein The electrochemical electrolytic cell further comprises a stirring fan blade, which is arranged at the bottom of the electrolytic cell cavity and is used for mixing the cadmium ions in the electrolytic cell cavity when electrolyzing the cadmium ions.

3. The enrichment and detection device of cadmium ions according to claim 1, wherein The electrochemical electrolytic cell further comprises an overflow drainage hole, which is arranged at the upper end of the electrolytic cell cavity and is used to maintain a constant volume of the aqueous solution in the cell.

4. The enrichment and detection device of cadmium ions according to claim 1, wherein The electrochemical electrolytic cell further includes a water flow switch, an interface of which is connected to the bottom of the electrolytic cell cavity, and the water flow switch is used to control the discharge of the sample to be tested in the electrolytic cell cavity.

5. The enrichment and detection device of cadmium ions according to claim 1, wherein The main control box is fitted with the back of the electrolytic cell cavity to form an integrated structure. The main control box includes an integrated circuit main control board and a touch display screen. The touch display screen is connected to the integrated circuit main control board for adjusting parameters and displaying monitoring data. The integrated circuit main control board is used to control the operation of the entire device.

6. The enrichment and detection device of cadmium ions according to claim 1, wherein The main control box further comprises a flow-type peristaltic pump and an injection port, wherein the injection port is connected to the flow-type peristaltic pump, and the flow-type peristaltic pump is used to measure and control the flow volume of the sample to be tested.

7. The enrichment and detection device of cadmium ions according to claim 1, wherein The thickness of the mesh glassy carbon electrode is 5-10 mm, and the pore size is 30-60 PPI. The thickness of the graphite electrode is 3-8 mm.

8. The enrichment and detection device of cadmium ions according to claim 1, wherein The detection range of the fluorescent fiber optic probe is 0.005 to 0.05 mg / L.

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