Rapid detection card for heavy metal cadmium

Abstract

The utility model provides a rapid detection card for heavy metal cadmium, and solves the problems that the rapid detection card for heavy metal cadmium is used for rapidly and conveniently detecting heavy metal cadmium in crops, a professional filtering device is not easy to carry when a user goes out for sampling, and the operation process is relatively complicated and is inconsistent with the original intention of rapid detection. According to the utility model, the through groove is formed in the base plate, the filter tube and the liquid storage cylinder are arranged in the through groove, and the filter paper sheet is arranged at the joint of the filter tube and the liquid storage cylinder, so that sample liquid which passes through the filter paper sheet through the filter tube and enters the liquid storage cylinder can be filtered; therefore, the rapid heavy metal cadmium detection card can detect heavy metal cadmium in a filtered sample solution, and the filter tube and the liquid storage cylinder located in the through groove are small in size and can be conveniently carried along with the rapid heavy metal cadmium detection card.

Description

Technical Field

[0001] This utility model relates to the field of heavy metal detection technology, and in particular to a rapid detection card for the heavy metal cadmium. Background Technology

[0002] Cadmium (Cd) is a silvery-white metal, belonging to the transition metals, with good ductility and corrosion resistance. It is mainly used in batteries (such as nickel-cadmium batteries), coatings, alloys, plastic stabilizers, and optoelectronic materials. While cadmium has important industrial applications, its toxicity and environmental hazards make its detection crucial.

[0003] Cadmium can enter the food chain through soil and water, posing a serious threat to human health. To ensure food safety, it is necessary to test crops from contaminated areas for cadmium. A rapid cadmium detection card is a portable testing tool used to quickly detect cadmium content in water samples or other liquids, and can detect cadmium in grains and vegetables, a type of crop. Detecting cadmium in crop samples requires first dissolving and extracting the sample, then filtering the extract, and finally using the rapid cadmium detection card. For example, Chinese utility model patent CN220899632U ​​discloses a water sample filtration structure for a rapid cadmium detection card in vegetables. This utility model filters the crop extract using a water sample filtration structure, enabling the rapid cadmium detection card to detect cadmium in the filtered water sample. However, while the rapid cadmium detection card aims to quickly and conveniently detect cadmium in crops, using a professional filtration device is not easy to carry when sampling outdoors, and the operation process is relatively complex, which contradicts the original intention of rapid detection. Utility Model Content

[0004] To address the problems in the background technology where rapid detection cards for heavy metal cadmium are intended to quickly and conveniently detect cadmium in crops, but the use of specialized filtering devices makes them difficult to carry when sampling outdoors, and the operation process is relatively complex, which contradicts the original intention of rapid detection, this utility model proposes a rapid detection card for heavy metal cadmium.

[0005] The technical solution of this utility model is: a rapid detection card for heavy metal cadmium, including a base plate, a bonding pad and a reaction membrane are fixedly disposed inside the base plate, the bonding pad is attached to the reaction membrane, a liquid filling hole is opened on the base plate, the liquid filling hole is vertically corresponding to the bonding pad, and an observation hole is opened on the base plate, the observation hole is vertically corresponding to the reaction membrane.

[0006] The front side of the base plate has a through groove extending in the left and right directions and being open in both directions. A filter tube, which is a transparent plastic tube, is installed in the through groove along its extension direction. The left end of the filter tube has a liquid storage cylinder with a right-open structure. The inner wall of the left end of the filter tube has an internal thread, and the outer circumference of the right end of the liquid storage cylinder has an external thread. The right end of the liquid storage cylinder is threaded into the left end of the filter tube through the external and internal threads. An annular retaining ring is fixed on the inner wall of the filter tube. A filter paper is placed between the annular retaining ring and the right end of the liquid storage cylinder. The liquid storage cylinder can press the filter paper tightly against the annular retaining ring to seal the inside of the annular retaining ring, thereby filtering the sample liquid that passes through the filter tube, the filter paper, and enters the liquid storage cylinder.

[0007] Preferably, the inner wall of the filter tube is slidably sealed with a rubber stopper, and a push rod extending to the right is fixed on the rubber stopper. The right end of the push rod protrudes from the filter tube and is provided with a pressing plate.

[0008] Preferably, the outer circumferential surface of the push rod is provided with a plurality of blades evenly distributed along its circumferential direction, and the blades are slidably disposed on the inner wall of the filter tube.

[0009] Preferably, the right end of the liquid storage cylinder is provided with an air hole that allows for internal and external ventilation.

[0010] Preferably, the left end of the liquid storage cylinder extends through the through groove.

[0011] Preferably, the liquid storage cylinder is made of transparent plastic, and the outer circumference of the liquid storage cylinder is provided with measuring scale.

[0012] Preferably, a limiting ring is fixedly provided in the through groove, the right end of the filter tube is located to the right of the limiting ring, the right end of the liquid storage cylinder passes through the limiting ring and is threaded into the left end of the filter tube, a fixing block is provided at the right end of the through groove, the fixing block is provided with an annular protrusion strip, the fixing block is engaged in the through groove by the annular protrusion strip, and the fixing block is used to press and fix the filter tube on the limiting ring.

[0013] Preferably, the front side of the base plate has a long groove extending in the left-right direction, and the long groove is connected to the through groove in the front and back.

[0014] Advantages of this invention: This invention sets a through groove on the base plate, and sets a filter tube and a liquid storage cylinder in the through groove. A filter paper is set at the connection between the filter tube and the liquid storage cylinder. This allows the sample liquid that passes through the filter tube, the filter paper, and enters the liquid storage cylinder to be filtered. This enables the rapid detection card for heavy metal cadmium to detect heavy metal cadmium in the filtered sample solution. In addition, the filter tube and liquid storage cylinder located in the through groove are small in size and can be easily carried along with the rapid detection card for heavy metal cadmium. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0017] Figure 2 This is a side sectional view of the internal structure of the through groove of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the winglet of this utility model.

[0019] In the diagram: 1. Base plate; 2. Binding pad; 3. Reaction membrane; 4. Liquid filling hole; 5. Observation hole; 6. Through groove; 7. Filter tube; 8. Liquid storage cylinder; 9. Annular retaining ring; 10. Filter paper; 11. Rubber stopper; 12. Push rod; 13. Press plate; 14. Wing; 15. Vent; 16. Limiting ring; 17. Fixing block; 18. Long groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: A rapid detection card for the heavy metal cadmium, such as Figure 1-2 As shown, the apparatus includes a substrate 1, within which a conjugate pad 2 and a reaction membrane 3 are fixed. The conjugate pad 2 is attached to the reaction membrane 3 and is used to adsorb the sample liquid. Through capillary action, the sample liquid is uniformly precipitated onto the reaction membrane 3, allowing the fluorescent microsphere-labeled antibody in the reaction membrane 3 to specifically bind with the heavy metal in the sample liquid, resulting in a color change. For those skilled in the art, both the conjugate pad 2 and the reaction membrane 3 are well-known technologies and will not be described in detail. The substrate 1 has a liquid addition hole 4, which corresponds vertically to the conjugate pad 2. The sample liquid is added to the conjugate pad 2 through the liquid addition hole 4. The substrate 1 also has an observation hole 5, which corresponds vertically to the reaction membrane 3. The color change on the reaction membrane 3 is observed through the observation hole 5, thereby determining the concentration of the heavy metal cadmium.

[0022] A through groove 6 extending in the left-right direction and open in both directions is provided on the front side of the base plate 1. A filter tube 7, made of transparent plastic, is provided in the through groove 6 along its extension direction. A liquid storage cylinder 8 with a right-open structure is provided at the left end of the filter tube 7. An internal thread is provided on the inner wall of the left end of the filter tube 7, and an external thread is provided on the outer circumference of the right end of the liquid storage cylinder 8. The right end of the liquid storage cylinder 8 is threaded into the left end of the filter tube 7 through the external and internal threads. An annular retaining ring 9 is fixedly provided on the inner wall of the filter tube 7. The annular retaining ring 9 and the liquid storage cylinder are connected. A filter paper sheet 10 is provided between the right ends of the reservoir 8. The reservoir 8 can press the filter paper sheet 10 tightly against the annular retaining ring 9 so that the filter paper sheet 10 seals the inside of the annular retaining ring 9. This allows the sample liquid that passes through the filter tube 7, the filter paper sheet 10 and enters the reservoir 8 to be filtered. This enables the heavy metal cadmium rapid detection card to detect heavy metal cadmium in the filtered sample solution. The filter tube 7 and the reservoir 8 located in the through groove 6 are small in size and can be easily carried along with the heavy metal cadmium rapid detection card.

[0023] like Figure 2 As shown, in order to accelerate the rate at which the sample liquid passes through the filter tube 7, the filter paper 10, and enters the storage cylinder 8, a rubber stopper 11 is slidably sealed on the inner wall of the filter tube 7. A push rod 12 extending to the right is fixed on the rubber stopper 11. The right end of the push rod 12 extends out of the filter tube 7 and is equipped with a pressing plate 13. After the sample liquid is added to the filter tube 7, the rubber stopper 11 is inserted into the filter tube 7. By pressing the pressing plate 13, the push rod 12 moves the rubber stopper 11, which can squeeze the sample liquid so that the sample liquid quickly passes through the filter paper 10 and enters the storage cylinder 8, thereby improving the filtration efficiency.

[0024] like Figure 3 As shown, the outer circumferential surface of the push rod 12 is provided with a plurality of fins 14 evenly distributed along its circumferential direction. The fins 14 are slidably disposed on the inner wall of the filter tube 7. The fins 14 can guide the push rod 12 to slide left and right, thereby improving the stability of the rubber stopper 11 during the sliding process.

[0025] like Figure 2 As shown, in order to allow the sample solution to enter the storage cylinder 8 smoothly, the right end of the storage cylinder 8 is provided with an air hole 15 that is open to both the inside and outside. The air hole 15 can balance the air pressure inside the storage cylinder 8 to prevent the sample solution from being difficult to enter the storage cylinder 8 due to air pressure.

[0026] like Figure 2 As shown, the left end of the liquid storage cylinder 8 extends through the through groove 6, allowing the operator to directly rotate the liquid storage cylinder 8 from the outside and detach it from the right end of the filter tube 7, thereby improving the detection efficiency.

[0027] The liquid storage cylinder 8 is made of transparent plastic. The outer circumference of the liquid storage cylinder 8 is provided with a measuring scale, which can measure the sample solution entering the liquid storage cylinder 8 when the liquid storage cylinder 8 is in a vertical position. This allows a quantitative amount of sample solution to be injected through the liquid filling hole 4, further improving detection efficiency and simplifying the operation process.

[0028] like Figure 1-2 As shown, a limiting ring 16 is fixedly installed in the through groove 6. The right end of the filter tube 7 is located to the right of the limiting ring 16. The right end of the liquid storage cylinder 8 passes through the limiting ring 16 and is threaded into the left end of the filter tube 7. A fixing block 17 is provided at the right end of the through groove 6. The fixing block 17 is provided with an annular protrusion strip. The fixing block 17 is engaged in the through groove 6 through the annular protrusion strip. The fixing block 17 is used to press and fix the filter tube 7 against the limiting ring 16.

[0029] The front side of the base plate 1 is provided with a long groove 18 extending in the left and right direction. The long groove 18 is connected to the through groove 6. The state of the sample solution inside the filter tube 7 can be directly observed through the long groove 18. The volume of the sample solution in the liquid storage cylinder 8 can be observed through the long groove 18. The fixing block 17 can be easily removed from the through groove 6 through the long groove 18. The push plate 13 and push rod 12 located in the through groove 6 can be easily pulled out through the long groove 18.

[0030] Working principle: In use, the base plate 1 is erected, the sample solution is added into the filter tube 7, and the rubber stopper 11 is inserted into the filter tube 7. By pressing the push plate 13, the rubber stopper 11 is moved by the push rod 12, squeezing the sample liquid so that it quickly passes through the filter paper 10 and enters the reservoir 8. At the same time, the measuring scale on the reservoir 8 is observed to obtain the specified volume of sample liquid. Then, the reservoir 8 is rotated to detach it from the right end of the filter tube 7. The base plate 1 is laid flat, and the sample liquid in the reservoir 8 is dripped onto the conjugate pad 2 of the liquid addition hole 4. The sample liquid is adsorbed by the conjugate pad 2 and precipitated onto the reaction membrane 3 through capillary action. The fluorescent microsphere-labeled antibody in the reaction membrane 3 specifically binds to the heavy metal in the sample liquid, producing a color change. The color change of the reaction membrane 3 is observed through the observation hole 5 to determine the cadmium content in the sample solution.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rapid detection card for the heavy metal cadmium, characterized in that: Includes a base plate (1), a bonding pad (2) and a reaction membrane (3) are fixedly provided inside the base plate (1), the bonding pad (2) is attached to the reaction membrane (3), a liquid filling hole (4) is opened on the base plate (1), the liquid filling hole (4) corresponds to the bonding pad (2) vertically, and an observation hole (5) is opened on the base plate (1), the observation hole (5) corresponds to the reaction membrane (3) vertically; A through groove (6) extending in the left-right direction and open to both sides is provided on the front side of the base plate (1). A filter tube (7) is provided in the through groove (6) along its extension direction. The filter tube (7) is a transparent plastic tube. A liquid storage cylinder (8) with a right opening structure is provided at the left end of the filter tube (7). An internal thread is provided on the inner wall of the left end of the filter tube (7). An external thread is provided on the outer circumference of the right end of the liquid storage cylinder (8). The right end of the liquid storage cylinder (8) is threaded into the filter tube through the external thread and the internal thread. Inside the left end of the tube (7), an annular retaining ring (9) is fixedly provided on the inner wall of the filter tube (7). A filter paper (10) is provided between the annular retaining ring (9) and the right end of the liquid storage cylinder (8). The liquid storage cylinder (8) can press the filter paper (10) tightly against the annular retaining ring (9) so that the filter paper (10) seals the inside of the annular retaining ring (9) and can filter the sample liquid that passes through the filter tube (7), passes through the filter paper (10), and enters the liquid storage cylinder (8).

2. The rapid detection card for heavy metal cadmium according to claim 1, characterized in that: The inner wall of the filter tube (7) is slidably sealed with a rubber stopper (11), and a push rod (12) extending to the right is fixed on the rubber stopper (11). The right end of the push rod (12) passes through the filter tube (7) and is provided with a pressing plate (13).

3. The rapid detection card for heavy metal cadmium according to claim 2, characterized in that: Multiple blades (14) are evenly distributed along the circumferential direction on the outer circumferential surface of the push rod (12), and the blades (14) are slidably disposed on the inner wall of the filter tube (7).

4. The rapid detection card for heavy metal cadmium according to claim 1, characterized in that: The right end of the liquid storage cylinder (8) is provided with an air hole (15) that allows air to pass through both inside and outside.

5. The rapid detection card for heavy metal cadmium according to claim 1, characterized in that: The left end of the liquid storage cylinder (8) extends through the through groove (6).

6. The rapid detection card for heavy metal cadmium according to claim 1, characterized in that: The liquid storage cylinder (8) is made of transparent plastic and has a measuring scale on its outer circumference.

7. The rapid detection card for heavy metal cadmium according to claim 1, characterized in that: A limiting ring (16) is fixedly installed inside the through groove (6). The right end of the filter tube (7) is located to the right of the limiting ring (16). The right end of the liquid storage cylinder (8) passes through the limiting ring (16) and is threaded into the left end of the filter tube (7). A fixing block (17) is provided at the right end of the through groove (6). An annular protrusion is provided on the fixing block (17). The fixing block (17) is snapped into the through groove (6) by the annular protrusion. The fixing block (17) is used to press and fix the filter tube (7) against the limiting ring (16).

8. A rapid detection card for the heavy metal cadmium according to any one of claims 1-7, characterized in that: The front side of the base plate (1) has a long groove (18) extending in the left and right direction, and the long groove (18) is connected to the through groove (6) in the front and back.

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