Electrode clamp for electrochemical detection of heavy metals

Abstract

The utility model discloses an electrode clamp for electrochemical detection of heavy metals. The electrode clamp comprises a bottom plate, an upper cover plate and a screen printing electrode arranged between the bottom plate and the upper cover plate, the screen-printed electrode comprises a substrate insulating layer, and three electrodes, a conductive terminal and a conductive path connecting the three electrodes and the conductive terminal are arranged on the substrate insulating layer. The middle part of the upper cover plate is sunken inwards to form a circular hole-shaped structure, and the circular hole-shaped structure is correspondingly attached to three electrodes of the wire mesh electrode to form a circular groove serving as a fixed liquid dropping area; and after the bottom plate and the upper cover plate are buckled, an electrode slot is formed at one end containing the conductive terminal, and the other end is a handheld area. The beneficial effects of the utility model are that: the electrode has texture, is not easy to bend, does not make direct contact with the hand to generate errors, has a fixed liquid dropping area and an electrode handheld area, is provided with the electrode slot matched with the USB, accords with the common insertion habit, and reduces the operation difficulty of a user.

Description

Technical Field

[0001] The utility model relates to the field of heavy metal electrochemical detection, in particular to a clamp for heavy metal electrochemical detection electrodes. Background Art

[0002] Heavy metal ions are difficult to degrade by microorganisms and can accumulate in animals, plants, and humans through the food chain, causing chronic poisoning and other health problems. Therefore, heavy metal detection is of great significance to food safety, environmental protection, and human health. Currently, commonly used heavy metal detection methods include atomic absorption spectrometry (AAS), atomic fluorescence spectrometry (AFS), inductively coupled plasma mass spectrometry (ICP-MS), and electrochemical detection. Among them, electrochemical detection reduces and oxidizes heavy metal ions at a specific potential and measures the concentration of heavy metal ions by analyzing the response current. This method has the advantages of simple, rapid testing, and low cost, and is currently widely used in the field of food safety.

[0003] Using screen-printed electrodes for heavy metal detection is the most convenient method for implementing electrochemical detection technology. Currently, this type of electrode has gradually developed into a replacement for traditional electrodes such as glassy carbon electrodes and gold sheet electrodes, and has broad application prospects in electrochemical analysis in environmental, clinical, and agricultural food fields. Screen-printed electrodes are prepared by printing conductive active materials onto an insulating substrate using thick-film screen printing technology. Using the screen-printed electrode as a carrier, heavy metal ions are enriched on the carrier surface, and then the oxidation current is used to detect heavy metal ions. Screen-printed electrodes can be manufactured as maintenance-free, disposable electrodes, can be mass-produced with good batch-to-batch consistency and reproducibility, and can also be customized according to user needs. These characteristics make them an ideal solution for electrochemical detection product applications.

[0004] Today, screen-printed electrodes used for electrochemical detection of heavy metals generally need to be inserted into an electrolytic cell containing a test solution, just like traditional electrodes, to complete the test. This not only requires a traditional electrolytic cell and a holder to vertically fix the electrodes, but also a relatively large amount of test solution (typically 1-5 mL), which is still not optimized in terms of ease of use and cost. To address these issues, a viable solution is to directly add the test solution to the surface of the screen-printed electrode to complete the test. In this case, the solution only needs to completely cover the three electrodes (reference electrode, counter electrode, and working electrode). This method does not require a traditional electrolytic cell and uses a small amount of solution (typically 100-300 µL), making it easy to use. However, when the solution is added to the electrode surface, the test may fail due to different electrode textures or due to factors such as vibration and accidental contact, causing the solution to spill. Utility Model Content

[0005] The purpose of this utility model patent is to facilitate the use of screen-printed electrodes and to propose a screen-printed electrode fixture that conforms to common insertion habits, has a fixed dripping area, and does not come into direct contact with the hand.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: an electrode fixture for electrochemical detection of heavy metals, comprising a base plate, an upper cover plate, and a screen-printed electrode disposed between the base plate and the upper cover plate;

[0007] The screen-printed electrode comprises a base insulating layer on which are arranged three electrodes, a conductive terminal, and a conductive path connecting the three electrode pins and the conductive terminal;

[0008] The middle part of the upper cover plate is indented inward to form a circular hole structure, and the circular hole structure is correspondingly fitted with the three electrodes of the wire mesh electrode to form a circular groove as a fixed dripping area;

[0009] After the bottom plate and the upper cover plate are buckled together, an electrode slot is formed at one end including the conductive terminal, and the other end is a hand-holding area.

[0010] Furthermore, the upper cover plate and the bottom plate are fastened together through a slot structure to form a strip-shaped slot capable of accommodating the screen-printed electrode, and the screen-printed electrode is fixed in the strip-shaped slot.

[0011] Furthermore, the material of the hand-holding area has a larger friction coefficient than that of other areas.

[0012] Furthermore, the upper cover is provided with a plurality of buckling holes, and the bottom plate is provided with a plurality of protrusions matching the buckling holes to form a buckle structure together, and the upper cover and the bottom plate can be buckled and fixed together through the buckling holes and protrusions.

[0013] Furthermore, a plurality of reinforcing ribs are provided in both the upper cover plate and the bottom plate.

[0014] Furthermore, the three-electrode pins include a reference electrode, a counter electrode, and a working electrode.

[0015] The beneficial effects of the utility model are as follows: the electrode has a texture and is not easy to bend, does not come into direct contact with the hand to cause errors, has a fixed dripping area and an electrode holding area, and comes with an electrode slot that matches the USB, which conforms to common insertion habits and reduces the difficulty of operation for users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the fixture of the utility model;

[0017] Figure 2 This is an exploded view of the structure of the fixture of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the upper cover plate of the fixture of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the fixture base plate of the utility model;

[0020] Figure 5 This is the principle diagram of the screen-printed electrode structure of the fixture of this utility model. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] The utility model contains screen-printed electrodes, and the appearance of the screen-printed electrode fixture used for heavy metal ion detection is as follows Figure 1 、 2As shown, the electrode fixture consists of a base plate 103, an upper cover plate 101 and a screen-printed electrode 102, and is divided into a hand-held area 112, a fixed dripping area 105 and an electrode slot 104 according to functional areas.

[0025] The structural principle diagram of the screen-printed electrode 102 of the present invention is as follows: Figure 2 As shown, it consists of a base insulating layer 110, three commonly used electrodes (reference electrode 108, counter electrode 107 and working electrode 106), a conductive path 111, a conductive terminal 109 and an insulating paint, which are printed in sequence on the base PET insulating layer by screen printing.

[0026] The utility model includes a screen printing electrode fixture, and the structure principle of the screen printing electrode fixture used for heavy metal ion detection is as follows Figure 5 As shown, the upper cover 101 and the bottom plate 103 secure the screen-printed electrodes 102 in the strip-shaped slots through matching slots. A circular hole on the upper cover 101 corresponds to the three-electrode structure of the screen-printed electrodes 102, and a round, roughened grip area is located above. Once the upper and bottom plates are assembled, electrode slots 104 are formed at the port locations, matching the USB port.

[0027] The structure of the electrochemical detection electrode support plate of the utility model is as follows Figure 3 (Upper cover) and Figure 4 As shown in the figure (bottom plate). The top cover 101 has a circular hole structure and a circular area on its exterior. When the circular hole structure is bonded to the screen electrode, a circular groove is formed, serving as a fixed dripping area 105. The material of the circular area has a higher friction coefficient than other areas and serves as the handle area 112. It has numerous internal reinforcing ribs to increase the rigidity of the shell, as well as several snap-fitting holes. The bottom plate 103 also has numerous internal reinforcing ribs and several protrusions that form a snap-fit ​​structure with the snap-fitting holes on the top cover 102. Specifically, in this embodiment, three snap-fitting holes are evenly distributed on each side of the top cover, and one is also provided in the handle area. The bottom plate, which matches the top cover, has corresponding protrusions. After the top cover 101 and bottom plate 103 are bonded, an electrode slot 104 is formed at the rear end to connect to the electrochemical test instrument, ensuring that the conductive terminals of the screen-printed electrode 102 in the middle bar slot can smoothly connect with the conductive segments of the electrochemical instrument interface.

[0028] In summary, the present invention proposes and designs a screen-printed electrode fixture with a simple structure and easy use. After adopting the above fixture, the present invention has the following beneficial effects: the electrode has a texture and is not easy to bend, does not come into direct contact with the hand to cause errors, has a fixed dripping area and an electrode holding area, conforms to common insertion habits, and reduces the difficulty of operation for users.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0030] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An electrode fixture for electrochemical detection of heavy metals, characterized in that: It includes a bottom plate, an upper cover plate, and a screen-printed electrode arranged between the bottom plate and the upper cover plate; The screen-printed electrode comprises a base insulating layer on which are arranged three electrodes, a conductive terminal, and a conductive path connecting the three electrodes and the conductive terminal; The middle part of the upper cover plate is indented inward to form a circular hole structure, and the circular hole structure is correspondingly fitted with the three electrodes of the wire mesh electrode to form a circular groove as a fixed dripping area; After the bottom plate and the upper cover plate are buckled together, an electrode slot is formed at one end including the conductive terminal, and the other end is a hand-holding area.

2. The electrode fixture for electrochemical detection of heavy metals according to claim 1, characterized in that: The upper cover plate and the bottom plate are buckled together through a slot structure to form a strip-shaped slot capable of accommodating the screen-printed electrode, and the screen-printed electrode is fixed in the strip-shaped slot.

3. The electrode fixture for electrochemical detection of heavy metals according to claim 1, characterized in that: The material of the hand-holding area has a larger friction coefficient than that of other areas.

4. An electrode fixture for electrochemical detection of heavy metals according to claim 1 or 2, characterized in that: The upper cover plate is provided with a plurality of buckling holes, and the bottom plate is provided with a plurality of protrusions matching the buckling holes to form a buckle structure together. The upper cover plate and the bottom plate can be buckled and fixed together through the buckling holes and the protrusions.

5. The electrode fixture for electrochemical detection of heavy metals according to claim 1, characterized in that: A plurality of reinforcing ribs are arranged in the upper cover plate and the bottom plate.

6. The electrode fixture for electrochemical detection of heavy metals according to claim 1, characterized in that: The three electrodes include a reference electrode, a counter electrode, and a working electrode.

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