An electrochemical sensor-based plasticizer detection kit

Abstract

The application provides a plasticizer detection kit based on an electrochemical sensor and relates to the field of plasticizer detection. The plasticizer detection kit based on the electrochemical sensor comprises a box body, an extraction area for adding a sample and an extraction buffer is arranged in the box body, a reaction area for loading a freeze-dried matrix, and an electrochemical sensing area for detecting plasticizers. The freeze-dried matrix comprises magnetic molecularly imprinted microspheres, a magnetically conductive and electrically conductive alloy plate, a counter electrode and a reference electrode are arranged in the electrochemical sensing area. The plasticizer detection kit based on the electrochemical sensor is integrated with sample extraction, specific reaction and electrochemical detection by arranging the extraction area, the reaction area and the electrochemical sensing area in the box body, and is not required to be transferred by multiple containers. The detection process is simplified, the detection time is shortened, the kit is suitable for on-site rapid detection, and the problems that a traditional kit cannot be in-situ enriched, is complicated to operate, is time-consuming and cannot meet the on-site rapid detection requirements can be solved.

Description

Technical Field

[0001] This invention relates to the field of plasticizer detection, specifically to a plasticizer detection kit based on an electrochemical sensor. Background Technology

[0002] Plasticizer testing involves qualitative, quantitative, and migration analysis of plasticizers. Its core purpose is to control toxic plasticizer residues in food, packaging, the environment, and daily necessities to meet national standards and regulatory requirements. Plasticizers are chemical substances added to plastics to make them softer and more resilient. The most common and harmful type of plasticizer is phthalates, which easily migrate from plastics into food and water. Long-term ingestion can disrupt the endocrine system and harm human health, thus they are strictly limited. Common plasticizer test kits are typically disposable test cards or boxes containing test strips or electrodes. After the sample extract is added, the recognition substance in the kit binds to the plasticizer, and the concentration is directly read on the instrument through color changes or electrochemical signals.

[0003] Traditional plasticizer detection kits only have a reaction membrane or simple electrode. The target analyte is dispersed in the liquid, resulting in low concentration and weak signal. Results can only be obtained after a long reaction time. Moreover, it is necessary to first perform magnetic enrichment, washing, and separation in centrifuge tubes or other containers before dropping the processed liquid onto the detection card in the kit. The operation is cumbersome and time-consuming, making it difficult to meet the needs of rapid on-site detection. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a plasticizer detection kit based on an electrochemical sensor, which solves the problems of cumbersome operation, long time consumption, and difficulty in meeting the needs of rapid on-site detection.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a plasticizer detection kit based on an electrochemical sensor, comprising a box body, wherein the box body is provided with an extraction zone for adding samples and extraction buffer, a reaction zone for loading a lyophilized matrix, and an electrochemical sensing zone for detecting plasticizers, the lyophilized matrix comprising magnetic molecularly imprinted microspheres, and a magnetically conductive alloy plate, a counter electrode and a reference electrode are installed in the electrochemical sensing zone; The box also contains a fixed electromagnetic coil and an adjustment plate for movement. When the electromagnetic coil is energized, the magnetically conductive alloy plate is magnetized and adsorbs magnetic molecular imprinted microspheres. By switching the control via the adjustment plate, the electromagnetic coil can be de-energized, and the magnetically conductive alloy plate can serve as the working electrode, together with the counter electrode and the reference electrode, to form an electrochemical detection circuit.

[0006] Preferably, the freeze-dried matrix further includes a dispersant, a protectant, and a buffer salt system.

[0007] Preferably, the surface of the magnetic molecularly imprinted microspheres has imprinted pores that can specifically bind plasticizers, and is also coated with magnetic nanoparticles.

[0008] Preferably, the box body includes an upper box and a bottom box. A cover is fixedly connected to the outside of the bottom box. The upper box is inserted into the cover and contacts the bottom box. The extraction area and the reaction area are located inside the upper box. The upper box is also provided with a feed inlet. The electrochemical sensing area is located inside the bottom box.

[0009] Preferably, the base box is further provided with two symmetrical mounting areas, with the electromagnetic coil and the adjustment plate located in the corresponding mounting areas.

[0010] Preferably, the adjusting plate is U-shaped, and an insulated handle is provided on one side of the adjusting plate. One end of the insulated handle passes through the bottom box and is slidably connected to the bottom box.

[0011] Preferably, iron cores are fixedly installed inside both installation areas. The two ends of the electromagnetic coil are wound around the two iron cores respectively, and the winding directions are opposite. Conductive heads are fixedly connected to both sides of the base box. The adjustment plate is in sliding contact with the conductive heads. A conductive rod is fixedly connected to one side of the iron core. The two ends of the electromagnetic coil are fixedly connected to the conductive parts A of the two conductive rods respectively. The adjustment plate includes a conductive part B and an insulating part B. In the initial state, the conductive part B is in contact with the conductive heads and conductive parts A. The two conductive parts B, the two conductive heads, the two conductive parts A, and the electromagnetic coil form a closed circuit. When the adjustment plate moves, the insulating part B is in contact with the conductive part A, the conductive part B is disengaged from the conductive part A, and is in contact with the magnetic and conductive alloy plate.

[0012] Preferably, the housing further includes an electrolyte box for adding electrolyte, the outlet of the electrolyte box facing the electrochemical sensing area, and the electrolyte box being fixedly connected to the upper housing.

[0013] Preferably, an inclined plate integrally formed with the upper box is fixedly connected in the extraction area, the two inclined plates are symmetrically arranged, a pressing rod is slidably connected in the upper box, a spring is fixedly connected between the head of the pressing rod and the upper box, and a sealing plate is fixedly connected to the tail of the pressing rod, the sealing plate is in contact with the bottom of the two inclined plates.

[0014] Preferably, the reaction zone is provided with an arc-shaped plate integrally formed therewith, the freeze-dried matrix is ​​located at the arc-shaped surface of the arc-shaped plate, and the arc-shaped plate is provided with a plurality of discharge grooves.

[0015] Compared with existing technologies, this invention has the following advantages: By setting an extraction zone, a reaction zone, and an electrochemical sensing zone within the kit, it achieves integrated sample extraction, specific reaction, and electrochemical detection, eliminating the need for multi-container transfer operations, simplifying the detection process, shortening detection time, and making it suitable for rapid on-site detection. By employing a magnetically conductive alloy plate with both magnetic and conductive functions, and with the switching control of an electromagnetic coil and an adjustment plate, it can first adsorb magnetically imprinted microspheres in a magnetized state to enrich the target plasticizer; then switch to a de-energized conductive state, allowing the alloy plate to serve as the working electrode to form a three-electrode detection system. This solves the problems of traditional reagent kits being unable to enrich in situ, having cumbersome operations, being time-consuming, and failing to meet the needs of rapid on-site detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the front view of the box body of the present invention; Figure 3 This is a cross-sectional view of the box body of the present invention; Figure 4 This is a partial structural diagram of the present invention; Figure 5 This is a cross-sectional view of the conductive part A of the conductive rod of the present invention in contact with the conductive part B of the adjusting plate. Figure 6 This is a cross-sectional view of the conductive part A of the conductive rod of the present invention in contact with the insulating part B of the adjusting plate. Figure 7 This is a cross-sectional view of the upper box of the present invention; Figure 8 This is a schematic diagram of the adjustment plate of the present invention; Figure 9 This is a schematic diagram of the magnetic and conductive alloy plate of the present invention; Figure 10 This is a cross-sectional view of the conductive rod of the present invention.

[0017] The components are as follows: 1. Box body; 101. Upper box; 102. Bottom box; 103. Wrapping cover; 2. Extraction area; 3. Reaction area; 4. Electrochemical sensing area; 5. Magnetic and conductive alloy plate; 6. Counter electrode; 7. Reference electrode; 8. Electromagnetic coil; 9. Adjustment plate; 901. Conductive part B; 902. Insulating part B; 10. Freeze-dried matrix; 11. Mounting area; 12. Insulated handle; 13. Iron core; 14. Conductive head; 15. Conductive rod; 151. Conductive part A; 152. Insulating part A; 16. Electrolyte box; 17. Inclined plate; 18. Pressing rod; 19. Sealing plate; 20. Arc plate; 21. Discharge groove. Detailed Implementation

[0018] like Figures 1-10As shown, a plasticizer detection kit based on an electrochemical sensor includes a housing 1. The housing 1 contains an extraction zone 2 for adding samples and extraction buffer, a reaction zone 3 for loading a lyophilized matrix 10, and an electrochemical sensing zone 4 for detecting plasticizers. The housing 1 includes an upper housing 101 and a lower housing 102. A covering 103 is fixedly connected to the outside of the lower housing 102. The upper housing 101 is inserted into the covering 103 and contacts the lower housing 102, allowing the upper housing 101 and lower housing 102 to be detachable. The extraction zone 2 and reaction zone 3 are located within the upper housing 101, which also has a feed inlet. The electrochemical sensing zone 4 is located within the lower housing 102. A magnetically conductive alloy plate 5 is fixedly connected to the lower housing 102. The lower housing 102 also contains two... A symmetrical mounting area 11 is provided, with the electromagnetic coil 8 and the adjustment plate 9 located within the corresponding mounting area 11. By symmetrically setting the mounting areas 11 within the base box 102, a stable mounting space is provided for the electromagnetic coil 8 and the adjustment plate 9. The structure is compact and reasonable, which is conducive to the overall miniaturization of the reagent kit. At the same time, it ensures the symmetry of the magnetic field on both sides, making the magnetic molecular imprinted microspheres more uniformly adsorbed. The adjustment plate 9 is U-shaped, and an insulating handle 12 is provided on one side of the adjustment plate 9. One end of the insulating handle 12 passes through the base box 102 and is slidably connected to the base box 102. The U-shaped adjustment plate 9, together with the insulating handle 12, facilitates external manual operation to switch between power on and off. The structure is simple and the operation is convenient. The insulating handle 12 can prevent electric shock to the operator and ensure smooth sliding, improving the safety and reliability of use.

[0019] Both mounting areas 11 have iron cores 13 fixedly installed inside. The two ends of the electromagnetic coil 8 are wound around the two iron cores 13 in opposite directions. The unwound portion of the electromagnetic coil 8 is fixedly connected to the base box 102. Conductive heads 14 are fixedly connected to both sides of the base box 102. The adjusting plate 9 slides in contact with the conductive heads 14. A conductive rod 15 is fixedly connected to one side of the iron core 13. The insulating part A152 of the iron core 13 and the conductive rod 15 are fixedly connected. The two ends of the electromagnetic coil 8 are fixedly connected to the conductive parts A151 of the two conductive rods 15. The adjusting plate 9 includes a conductive part B901 and an insulating part B902. Initially, the conductive part B901 is in contact with the conductive heads 14 and the conductive part A151. The two conductive parts B901, the two conductive heads 14, the two conductive parts A151, and the electromagnetic coil 8 form a closed circuit. At this time, the magnetically conductive alloy plate 5 is not energized. When the adjusting plate 9 moves, the insulating part B902 contacts the conductive part A151, and the conductive part... B901 disengages from the conductive part A151 and contacts the magnetically conductive alloy plate 5. The box body 1 also includes an electrolyte box 16 for adding electrolyte. The outlet of the electrolyte box 16 faces the electrochemical sensing area 4. The electrolyte box 16 is fixedly connected to the upper box 101. An inclined plate 17 integrally formed with the upper box 101 is fixedly connected in the extraction area 2. The two inclined plates 17 are symmetrically arranged. A pressing rod 18 is slidably connected in the upper box 101. The head of the pressing rod 18 is connected to the upper box 101. A spring is fixedly connected between the two inclined plates 17. The spring is in a static state. A sealing plate 19 is fixedly connected to the tail of the pressing rod 18. The sealing plate 19 contacts the bottom of the two inclined plates 17. An arc-shaped plate 20 integrally formed with the reaction zone 3 is provided. The freeze-dried matrix 10 is located at the arc surface of the arc-shaped plate 20. Several discharge grooves 21 are provided in the arc-shaped plate 20. By setting the arc-shaped plate 20 and multiple discharge grooves 21, the liquid after the reaction can flow evenly into the electrochemical sensing zone 4, avoiding local liquid accumulation or blockage.

[0020] The freeze-dried matrix 10 includes magnetic molecularly imprinted microspheres. The surface of these microspheres has imprinted pores that specifically bind plasticizers, and they are coated with magnetic nanoparticles (Fe3O4). These nanoparticles can be directionally adsorbed and enriched under an applied magnetic field, meaning they possess magnetic groups that can be adsorbed by a magnetic field. The imprinted pores on the surface of the microspheres specifically recognize plasticizers, allowing for selective binding of the target analyte and strong resistance to matrix interference. The coating of the microspheres with Fe3O4 magnetic nanoparticles gives them excellent magnetic response performance, enabling rapid enrichment on the working electrode surface under a magnetic field, increasing local concentration, significantly enhancing the electrochemical detection signal, and achieving high sensitivity for trace plasticizers. For quantitative detection, the lyophilized matrix 10 also includes a dispersant, a protective agent, and a buffer salt system. The buffer salt system is a mixture of various salts, such as phosphate, acetate, citrate, potassium chloride, and sodium chloride, used to stabilize the pH value of the solution, ensuring stable electrochemical reactions and accurate signals. The dispersant enables the magnetic molecularly imprinted microspheres to disperse rapidly and uniformly, preventing aggregation. The protective agent improves the stability of the active components and extends the shelf life of the kit. The buffer salt system can maintain the pH stability of the reaction system and improve the conductivity of the solution, further ensuring the smooth and reliable electrochemical reaction and improving the accuracy of the detection results. A magnetically conductive alloy plate 5, a counter electrode 6, and a reference electrode 7 are installed in the electrochemical sensing area 4. The housing 1 is also equipped with an electromagnetic coil 8 fixed to it and an adjustment plate 9 for movement; when the electromagnetic coil 8 is energized, the magnetically conductive alloy plate 5 is magnetized and adsorbs magnetic molecular imprinted microspheres; by switching control through the adjustment plate 9, the electromagnetic coil 8 can be de-energized, and the magnetically conductive alloy plate 5 serves as the working electrode, together with the counter electrode 6 and the reference electrode 7, to form an electrochemical detection circuit.

[0021] By setting up an extraction zone 2, a reaction zone 3, and an electrochemical sensing zone 4 within the housing 1, the sample extraction, specific reaction, and electrochemical detection are integrated into one, eliminating the need for multi-container transfer operations, simplifying the detection process, and shortening the detection time. This makes it suitable for rapid on-site detection. By employing a magnetically conductive alloy plate 5, which has both magnetic and electrical functions, and with the switching control of an electromagnetic coil 8 and an adjustment plate 9, it can first adsorb magnetic molecularly imprinted microspheres in a magnetized state to enrich the target plasticizer; then switch to a de-energized conductive state, allowing the alloy plate to serve as the working electrode, forming a three-electrode detection system. This solves the problems of traditional reagent kits, such as inability to enrich in situ, cumbersome operation, long processing time, and inability to meet the needs of rapid on-site detection.

[0022] This kit integrates sample extraction, specific binding of magnetic molecular imprints, magnetic in-situ enrichment, and electrochemical quantitative detection. Through the sequential reaction of extraction zone 2, reaction zone 3, and electrochemical sensing zone 4, combined with the switching between the magnetization enrichment mode of electromagnetic coil 8 and the electrochemical detection mode after power failure, it achieves rapid and highly sensitive detection of plasticizers. The entire process requires no complex pretreatment or multiple container transfers, and can meet the needs of rapid on-site detection.

[0023] During testing, the sample to be tested and the extraction buffer are added to the extraction zone 2 through the inlet. The extraction zone 2 is equipped with a symmetrical inclined plate 17, which can guide and collect the liquid, reduce the probability of liquid residue, and ensure that the sample and the extraction buffer are in full contact, so as to quickly and fully extract the plasticizer in the sample into the liquid phase.

[0024] Then, press down on the pressing rod 18, the spring is compressed, the sealing plate 19 moves down, the bottom channel of the inclined plate 17 opens, and the extracted sample liquid containing plasticizer enters the reaction zone 3 under the action of gravity; after releasing the pressing rod 18, the spring returns to its original position and drives the sealing plate 19 to re-close the bottom of the inclined plate 17, preventing liquid backflow and evaporation, which can realize the controllable and quantitative release of the extract, ensuring the consistency of sample injection and avoiding cross-contamination, and providing a stable sample environment for subsequent reactions.

[0025] After the sample solution enters reaction zone 3, it comes into contact with the lyophilized matrix 10 on the arc plate 20 and is rapidly rehydrated. The lyophilized matrix 10 contains: magnetic molecularly imprinted microspheres: the surface has imprinted pores that match the plasticizer, which can specifically recognize and bind to the plasticizer, greatly reducing the interference of oils and pigments in the sample; dispersant: to rapidly and uniformly disperse the magnetic molecularly imprinted microspheres, prevent agglomeration, and ensure that the recognition sites are fully exposed; protectant: to maintain the stability of the microsphere structure and ensure the long-term storage performance of the kit; buffer salt system: including phosphate, acetate, potassium chloride, and sodium chloride, which rapidly stabilizes the pH value of the system and provides sufficient ionic strength, laying the foundation for subsequent electrochemical reactions.

[0026] The arc-shaped plate 20 structure increases the contact area between the liquid and the freeze-dried matrix 10. Combined with multiple discharge tanks 21, the reconstituted reaction solution flows into the electrochemical sensing zone 4. At the same time, electrolyte is added to the electrolyte box 16 and flows into the electrochemical sensing zone 4 to further replenish the ionic strength of the system and ensure that the three-electrode system has a stable electrochemical working environment.

[0027] Next, in the initial state, such as Figure 5As shown, the conductive part B901 of the adjusting plate 9 is in contact with both the conductive head 14 and the conductive part A151 of the conductive rod 15. The two conductive heads 14 are connected to the positive and negative terminals of an external power supply. Current flows from one conductive head 14 into the conductive part B901 of the adjusting plate 9, then to the conductive part A151 of the conductive rod 15, and finally through the electromagnetic coil 8. Finally, a circuit is formed through the conductive part A151 of the other conductive rod 15, the conductive part B901 of the adjusting plate 9, and the conductive head 14, enabling the electromagnetic coil 8 to operate. The electromagnetic coil 8 is wound around two symmetrical iron cores 13 in opposite directions, forming a symmetrical, closed, and highly efficient magnetic circuit. This results in higher magnetic field utilization and more uniform distribution. Under the influence of the magnetic field, the magnetically conductive alloy plate 5 is... Rapid magnetization generates a directional magnetic field, firmly adsorbing the magnetically imprinted microspheres containing plasticizers in the reaction solution onto its surface, achieving in-situ enrichment of the target analyte. This energized structure is reliable and easy to switch, requiring no additional complex wiring. It ensures stable energization of the electromagnetic coil 8 to generate a magnetic field and lays the foundation for subsequent power-off switching by moving the adjustment plate 9, further simplifying the operation process and improving the practicality of the reagent kit. It should be noted that this step can highly concentrate trace plasticizers on the electrode surface, significantly increasing the local concentration and solving the problems of no enrichment, weak signal, and high detection limit in traditional reagent kits. At the same time, the enrichment process is completed in-situ in the electrochemical sensing area 4, eliminating the need for cumbersome operations such as magnetic separation, transfer, and washing, and greatly shortening the detection time.

[0028] Next, after enrichment is complete, the adjusting plate 9 is moved by pulling the insulated handle 12. The insulated handle 12 ensures safe operation and avoids electric shock. Figure 6As shown, after the adjusting plate 9 moves, its insulating part B902 contacts the conductive part A151, and the conductive part B901 disengages from the conductive part A151, thus breaking the circuit of the electromagnetic coil 8 and eliminating the magnetic field. Simultaneously, the conductive part B901 contacts the magnetically conductive alloy plate 5, connecting it to the electrochemical circuit. It should be noted that this switching structure achieves seamless switching between the two working modes of magnetization enrichment and electrochemical detection, avoiding interference from the magnetic field on the electrical signal, ensuring that the two functions do not affect each other and proceed in an orderly manner, improving detection stability and accuracy. After the electromagnetic coil 8 is de-energized, the magnetically conductive alloy plate 5 loses its... The electrode is demagnetized, retaining only its conductive function, and serves as the working electrode, together with the counter electrode 6 and the reference electrode 7, forming a three-electrode electrochemical detection system. The counter electrode 6 and the reference electrode 7 are each connected to an electrochemical detection instrument via independent conductive terminals. These conductive terminals are fixedly connected to the base box 102 and isolated from the circuits of the adjustment plate 9 and the electromagnetic coil 8 to avoid mutual interference. Subsequently, the DC power supply on the conductive head 14 is removed, allowing both conductive heads 14 to be connected to the electrochemical detection instrument via independent conductive terminals. The current path at this point is: electrochemical instrument, one conductive head 14, conductive part B901. The system comprises a magnetically conductive alloy plate 5 (working electrode), a solution system, a counter electrode 6, a reference electrode 7, and an electrochemical instrument. On the surface of the magnetically conductive alloy plate 5 (working electrode), the enriched plasticizer undergoes a specific redox reaction within the microenvironment of the imprinted pores, generating a detectable current signal. The counter electrode 6, connected to an external detection instrument, forms a closed current loop, receiving the charge transmitted from the working electrode to ensure stable charge transmission and allow the redox reaction to proceed continuously and stably. The reference electrode 7, connected to an external detection instrument, provides a stable potential reference, accurately calibrating the potential of the working electrode and effectively avoiding… Signal drift caused by potential fluctuations ensures the stability and accuracy of the detection signal. The instrument can achieve precise quantitative detection of plasticizers by collecting current signals and performing quantification. Due to the high enrichment of the target substance, the electrochemical signal is significantly enhanced, enabling highly sensitive detection of trace plasticizers and meeting national standard limits. The entire process is integrated, transfer-free, requires fewer operations, and is time-saving. It solves the problems of low sensitivity, cumbersome steps, and unsuitability for on-site detection of traditional reagent kits. Furthermore, structural optimization ensures enrichment efficiency, electrochemical stability, detection accuracy, and repeatability.

[0029] 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 plasticizer detection kit based on an electrochemical sensor, comprising a housing (1), characterized in that: The box (1) is provided with an extraction zone (2) for adding samples and extraction buffer, a reaction zone (3) for loading lyophilized matrix (10), and an electrochemical sensing zone (4) for detecting plasticizers. The lyophilized matrix (10) includes magnetic molecularly imprinted microspheres. The electrochemical sensing zone (4) is equipped with a magnetically conductive alloy plate (5), a counter electrode (6), and a reference electrode (7). The box (1) is also equipped with an electromagnetic coil (8) fixed to it and an adjustment plate (9) for moving it; when the electromagnetic coil (8) is energized, the magnetic conductive alloy plate (5) is magnetized and adsorbs magnetic molecular imprinted microspheres; by switching control through the adjustment plate (9), the electromagnetic coil (8) can be de-energized, and the magnetic conductive alloy plate (5) serves as the working electrode, which together with the counter electrode (6) and the reference electrode (7) constitutes an electrochemical detection circuit.

2. The plasticizer detection kit based on an electrochemical sensor according to claim 1, characterized in that: The freeze-dried matrix (10) also includes a dispersant, a protectant, and a buffer salt system.

3. The plasticizer detection kit based on an electrochemical sensor according to claim 1, characterized in that: The surface of the magnetic molecularly imprinted microspheres has imprinted pores that can specifically bind plasticizers, and is also coated with magnetic nanoparticles.

4. The plasticizer detection kit based on an electrochemical sensor according to claim 1, characterized in that: The box body (1) includes an upper box (101) and a bottom box (102). A cover (103) is fixedly connected to the outside of the bottom box (102). The upper box (101) is inserted into the cover (103) and contacts the bottom box (102). The extraction zone (2) and the reaction zone (3) are located in the upper box (101). The upper box (101) is also provided with a feed inlet. The electrochemical sensing zone (4) is located in the bottom box (102).

5. A plasticizer detection kit based on an electrochemical sensor according to claim 4, characterized in that: The base box (102) is also provided with two symmetrical mounting areas (11), and the electromagnetic coil (8) and the adjustment plate (9) are located in the corresponding mounting areas (11).

6. The plasticizer detection kit based on an electrochemical sensor according to claim 5, characterized in that: The adjustment plate (9) is U-shaped, and an insulating handle (12) is provided on one side of the adjustment plate (9). One end of the insulating handle (12) passes through the bottom box (102) and is slidably connected to the bottom box (102).

7. A plasticizer detection kit based on an electrochemical sensor according to claim 5, characterized in that: Both installation areas (11) are fixedly installed with iron cores (13). The two ends of the electromagnetic coil (8) are wound around the two iron cores (13) respectively, and the winding directions are opposite. The bottom box (102) is fixedly connected to both sides with conductive heads (14). The adjustment plate (9) is in sliding contact with the conductive heads (14). A conductive rod (15) is fixedly connected to one side of the iron core (13). The two ends of the electromagnetic coil (8) are fixedly connected to the conductive parts A (151) of the two conductive rods (15) respectively. The adjustment plate (9) includes the conductive parts. In the initial state, conductive part B (901) is in contact with conductive head (14) and conductive part A (151). The two conductive parts B (901), the two conductive heads (14), the two conductive parts A (151) and the electromagnetic coil (8) form a closed circuit. When the adjusting plate (9) moves, the insulating part B (902) is in contact with conductive part A (151), the conductive part B (901) is out of contact with conductive part A (151) and is in contact with the magnetic conductive alloy plate (5).

8. The plasticizer detection kit based on an electrochemical sensor according to claim 4, characterized in that: The box body (1) also includes an electrolyte box (16) for adding electrolyte, the outlet of the electrolyte box (16) faces the electrochemical sensing area (4), and the electrolyte box (16) is fixedly connected to the upper box (101).

9. A plasticizer detection kit based on an electrochemical sensor according to claim 4, characterized in that: The extraction area (2) is fixedly connected to an inclined plate (17) integrally formed with the upper box (101). The two inclined plates (17) are symmetrically arranged. A pressing rod (18) is slidably connected inside the upper box (101). A spring is fixedly connected between the head of the pressing rod (18) and the upper box (101). A sealing plate (19) is fixedly connected to the tail of the pressing rod (18). The sealing plate (19) contacts the bottom of the two inclined plates (17).

10. A plasticizer detection kit based on an electrochemical sensor according to claim 2, characterized in that: The reaction zone (3) is provided with an arc-shaped plate (20) integrally formed therewith. The freeze-dried matrix (10) is located on the arc surface of the arc-shaped plate (20). The arc-shaped plate (20) is provided with several discharge grooves (21).

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