A rapid detection device and method for formaldehyde in food

Abstract

The present invention discloses a rapid detection device and method for formaldehyde in food, which relate to the technical field of food detection. The device comprises an outer box body, wherein a sample detection cavity is provided on one side of the inner cavity of the outer box body, and an analysis and recording terminal is fixedly installed on the other side of the outer box body. The method for rapid detection of formaldehyde in food comprises the following steps: first, collecting a sample; second, dividing the sample; then, processing the sample; then, determining the formaldehyde concentration by photoelectrochemical means; then, analyzing the measurement results; and finally, recording the formaldehyde content at different depths of the corresponding food sample, which conforms to the current situation that formaldehyde infiltrates from the outside to the inside during formaldehyde treatment of the food. At the same time, the volatilization of formaldehyde is accelerated and the influence of water vapor on the detection of the photoelectrochemical detection probe is reduced by the cooperation of heating the upper end plate and the liquid collecting cooling seat, thereby improving the detection efficiency and the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of food detection, and in particular to a device and method for quickly detecting formaldehyde in food. Background Art

[0002] Formaldehyde is a highly toxic substance, designated by the WHO as a carcinogen and teratogen. Furthermore, it can harm the human respiratory, immune, and endocrine systems, causing chronic respiratory diseases, colon cancer, menstrual irregularities, and even memory and intellectual impairment in adolescents. Formaldehyde also has a coagulant effect, binding to proteins in the body and hindering metabolism and excretion. Long-term accumulation in the body can cause leukemia.

[0003] Appendix C of the "Hygienic Standard for the Use of Food Additives" (GB2760-2007) lists formaldehyde as the 38th-ranked processing aid for the food industry, but also stipulates that it must be removed or its residual content strictly controlled before final product production. Natural foods can undergo auto-oxidation or decomposition reactions under the influence of various factors, such as temperature, humidity, and light, producing formaldehyde. Furthermore, many unscrupulous vendors, driven by profit, use formaldehyde to treat foods to extend their shelf life and enhance their appearance. Therefore, the detection of formaldehyde in food is of paramount importance, directly impacting food safety and public health. Currently, commonly used formaldehyde detection methods include spectrophotometry, gas chromatography, and liquid chromatography. These methods, such as gas chromatography and liquid chromatography, require specialized equipment and specialized personnel, hindering widespread use. While spectrophotometry is simple to operate, it suffers from poor specificity and sensitivity, making it prone to errors in detection results. Therefore, we propose a rapid formaldehyde detection device and method for food. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that currently commonly used formaldehyde detection methods include spectrophotometry, gas chromatography, liquid chromatography, etc. These methods, such as gas chromatography and liquid chromatography, require special equipment and need special personnel to operate, which is not conducive to popularization and promotion of use. Although spectrophotometry is simple to operate, it has relatively poor specificity and sensitivity and is prone to errors in detection results. The present invention provides a rapid formaldehyde detection device and detection method in food.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A rapid detection device for formaldehyde in food comprises an outer box body, a sample detection cavity is provided on one side of the inner cavity of the outer box body, and an analysis and recording terminal is fixedly installed on the other side of the outer box body, a detection base is fixedly connected to the center of the bottom of the inner cavity of the sample detection cavity, and a sample dividing seat is fixedly sleeved on the upper end of the detection base, a plurality of detection circular holes are provided in an array on the upper end of the detection base, and a heating upper end plate is fixedly connected to the upper end of the inner wall of the detection circular hole, a connecting pipe is fixedly connected to the bottom center of the heating upper end plate, and a liquid collecting cooling seat is fixedly connected to the bottom of the connecting pipe, the liquid collecting cooling seat is arranged near the bottom of the detection circular hole, and a semiconductor refrigerator is buried in the detection base, photoelectrochemical detection probes are buried in the middle of the inner wall of the detection circular hole of the detection base, and multiple photoelectrochemical detection probes are electrically connected to the analysis and recording terminal.

[0007] Furthermore, a central rotating cylinder is fixedly connected to the center of the upper inner cavity of the sample dividing seat, and a sample dividing plate is sleeved on the upper end of the central rotating cylinder. A rotating cover is plugged and rotated at the upper end of the inner cavity of the sample dividing seat, and a sampling cylinder is set on one side of the upper end of the rotating cover.

[0008] Furthermore, a plurality of blanking holes are provided on the upper end of the sample dividing plate corresponding to the detection circular holes on the detection base, and a cutting knife is fixedly connected to the upper end of each blanking hole.

[0009] Furthermore, the outer wall of the upper end of the sampling cylinder is provided with a circle of annular convex edge, and a sample push rod is inserted into the upper end of the inner cavity of the sampling cylinder. A feed through hole is opened at the upper end of the central rotating cylinder corresponding to the position of the detection through hole on the detection base, and the upper end of the feed through hole is fixedly connected with a threaded connection seat, and the lower end of the outer wall of the sampling cylinder is threadedly connected to the threaded connection seat.

[0010] Furthermore, the heating surface of the semiconductor refrigerator is arranged upward, and a heating heat conductive plate group is fixedly connected to the heating surface, and a plurality of heating heat pipe heat exchangers are inserted through the heating heat conductive plate group, and the plurality of heating heat pipe heat exchangers are arranged corresponding to the heating upper end plate, and the outer ends of the heating heat pipe heat exchangers pass through the detection base and are buried in the heating upper end plate at the corresponding position, and the cooling surface of the semiconductor refrigerator is arranged downward, and a cooling heat conductive plate group is fixedly connected to the bottom of the cooling surface, and a plurality of cooling heat pipe heat exchangers are inserted through the cooling heat conductive plate group, and the outer ends of the plurality of cooling heat pipe heat exchangers pass through the detection base and are buried in the liquid collecting cooling seat at the corresponding position.

[0011] Furthermore, the connecting tube is a hollow tubular structure, and a connecting hole is provided in the middle of the heating upper end plate corresponding to the upper end of the connecting tube. The liquid collecting cooling seat is a disc-shaped structure with an open upper end, and a plurality of air outlet holes are evenly provided on the outer wall of the lower end of the connecting tube near the bottom.

[0012] Furthermore, an annular step is provided on the upper end of the outer wall of the detection base, and a rubber sealing ring is fixedly connected to the side wall of the annular step. The bottom of the sample splitting seat is fixedly connected to the upper end of the detection base with a snap-fit ​​sleeve, and a plurality of snap-fit ​​protrusions are fixedly connected to the inner wall of the snap-fit ​​sleeve at equal intervals.

[0013] Furthermore, the bottom surface of the sample dividing seat is provided with a material receiving and guiding hole at the center between the multiple material discharge holes of the sample dividing plate, and the material discharge holes and the material receiving and guiding holes of the sample dividing plate are both semicircular holes. The bottom of the cutting knife is fixed corresponding to the straight edge of the semicircle, and the blade of the cutting knife extends toward the top of the semicircular hole. The bottom surface of the sample dividing seat is fixedly connected to a rubber sealing gasket.

[0014] Furthermore, the upper rear side of the outer box body is fixedly connected to a box cover via a hinge, and the front center of the box cover and the front center of the outer box body are fixedly connected to a duckbill box buckle.

[0015] The above-mentioned method for rapid detection of formaldehyde in food comprises the following steps:

[0016] S1. Use the sampling tube to insert from the outside of the food sample, then twist and break the sample so that the sample remains in the sampling tube and is taken out to complete the sample collection;

[0017] S2. Insert the sample collection tube into the sample push rod, which is then fixed to the central rotating cylinder by threaded engagement with the threaded connector. Press the sample push rod while rotating the central rotating cylinder, so that the sample in the sample tube is squeezed against the upper end of the sample dividing plate. As the sample rotates, it is sequentially divided by the multiple cutting blades, thereby cutting off multiple sample segments.

[0018] S3. The semiconductor refrigerator is started. The heat from the heating surface of the semiconductor refrigerator heats the upper end plate to dry the divided sample on the upper end plate, thereby accelerating the volatilization of formaldehyde in the sample. The volatilized formaldehyde carries the evaporated water vapor through the connecting pipe into the liquid collecting cooling seat. The cooling surface of the semiconductor refrigerator absorbs heat through the liquid collecting cooling seat, causing the water vapor to condense into water, which is retained in the liquid collecting cooling seat.

[0019] S4. Detecting the cooled gas in the middle section using a photoelectrochemical detection probe to determine the formaldehyde concentration;

[0020] S5. The electrical signals detected by the multiple photoelectrochemical detection probes are processed by the analysis and recording terminal, and the concentration of formaldehyde in the sample is calculated based on the detection results and the standard curve to obtain the corresponding measurement result;

[0021] S6. Analyze the detection results of multiple photoelectrochemical detection probes to analyze the formaldehyde content results at multiple locations at different depths from the inside to the outside of the food, determine the comprehensive formaldehyde content in the food, and determine whether the food has been treated with formaldehyde;

[0022] S7. Record in detail every step of the test process, experimental conditions, test results and other information, and write a test report.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. The present invention is provided with a sampling cylinder, which can intercept food samples. The sample dividing seat is provided, and the sample dividing seat can divide the sample and put it into multiple detection holes in the detection base. Then, the sample dividing seat is pulled out, and the angle of the sample dividing seat is rotated so that the material receiving and guiding holes on the bottom surface of the sample dividing seat are staggered with the detection holes on the detection base. The upper end of the detection hole of the detection base is blocked. The detection base is provided, and the heating upper end plate in the multiple detection holes of the detection base can heat the food sample slices, so that the formaldehyde and water vapor in the food sample slices are volatilized. The upper end of the heated upper end plate is volatilized through the connecting pipe and the liquid collecting cooling seat. The mixed gas of water vapor and formaldehyde is ejected downward from the inner cavity of the liquid collecting cooling seat through the connecting pipe. After cooling and condensing by the liquid collecting cooling seat, the water vapor is left behind and the formaldehyde is diffused in the inner cavity between the heating upper end plate and the liquid collecting cooling seat. The formaldehyde in the middle of the inner cavity is detected by the photoelectrochemical detection probe. The detection results in multiple detection holes correspond to the formaldehyde content at different depths of the food samples, which is consistent with the current situation that formaldehyde infiltrates from the outside to the inside during food treatment. At the same time, the cooperation of the heating upper end plate and the liquid collecting cooling seat accelerates the volatilization of formaldehyde and reduces the influence of water vapor on the detection of the photoelectrochemical detection probe, thereby improving the detection efficiency and accuracy.

[0025] 2. The present invention is provided with a central rotating cylinder, which can be sleeved with a fixed sample dividing plate. At the same time, the convex shaft at the center of the lower end of the rotating cover is plugged in, so that the rotating cover can rotate in the sample dividing seat. Through the provided sampling cylinder, the sampling cylinder can send the collected food sample into the upper end of the sample dividing plate.

[0026] 3. The present invention provides a connecting pipe, and the volatilized gas after the food sample on the upper end of the heating upper end plate is heated causes the air pressure on the upper end of the heating upper end plate to increase, so that the gas is squeezed into the center of the liquid collecting cooling seat through the lower end of the connecting pipe. After being cooled in contact with the liquid collecting cooling seat, substances with low boiling points are directly condensed in the liquid collecting cooling seat. Formaldehyde has a low boiling point and can flow and disperse in the inner cavity between the heating upper end plate and the liquid collecting cooling seat, which facilitates the photoelectrochemical detection probe to detect the formaldehyde content and reduces the interference of water vapor on the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of a rapid detection device for formaldehyde in food;

[0028] Figure 2 This is a rear-view cross-sectional view of a rapid formaldehyde detection device for food;

[0029] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is a top sectional view of a rapid detection device for formaldehyde in food;

[0031] Figure 5 It is a side sectional view of the connection of the corresponding sampling tube in the rapid detection device for formaldehyde in food;

[0032] Figure 6 This is a bottom-up structural diagram of the corresponding sample dividing seat in the rapid detection device for formaldehyde in food;

[0033] Figure 7 This is a flowchart of the rapid detection method for formaldehyde in food.

[0034] Figure markings: 1. Outer box body; 2. Sample detection chamber; 3. Analysis and recording terminal; 4. Detection base; 5. Sample dividing seat; 6. Central rotating cylinder; 7. Rotating cover; 8. Sample dividing plate; 9. Cutting knife; 10. Connecting pipe; 11. Heating upper end plate; 12. Liquid collecting cooling seat; 13. Semiconductor refrigerator; 14. Refrigeration heat conducting plate group; 15. Refrigeration heat pipe heat exchanger; 16. Heating heat conducting plate group; 17. Heating heat pipe heat exchanger; 18. Photoelectrochemical detection probe; 19. Snap-fit ​​convex teeth; 20. Rubber sealing ring; 21. Sampling tube; 22. Sample push rod; 23. Threaded connection seat; 24. Material receiving and guiding hole; 25. Box cover; 26. Duckbill box buckle. DETAILED DESCRIPTION

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] See also Figure 1 - Figure 6 The present invention provides a rapid detection device for formaldehyde in food, comprising an outer box body 1, a sample detection chamber 2 is provided on one side of the inner cavity of the outer box body 1, and an analysis and recording terminal 3 is fixedly installed on the other side of the outer box body 1, a detection base 4 is fixedly connected to the center of the inner cavity bottom of the sample detection chamber 2, and a sample dividing seat 5 is fixedly sleeved on the upper end of the detection base 4, a plurality of detection circular holes are provided in an array on the upper end of the detection base 4, and a heating upper end plate 11 is fixedly connected to the upper end of the inner wall of the detection circular hole, a connecting pipe 10 is fixedly connected to the bottom center of the heating upper end plate 11, and a liquid collecting cooling seat 12 is fixedly connected to the bottom of the connecting pipe 10, the liquid collecting cooling seat 12 is arranged near the bottom of the detection circular hole, and a semiconductor refrigerator 13 is buried in the detection base 4, and a photoelectrochemical detection probe 18 is buried in the middle of the inner wall of the detection circular hole of the detection base 4, and the plurality of photoelectrochemical detection probes 18 are electrically connected to the analysis and recording terminal 3.

[0037] In this embodiment, preferably, a central rotating cylinder 6 is fixedly connected to the center of the upper inner cavity of the sample dividing seat 5, and a sample dividing plate 8 is sleeved on the upper end of the central rotating cylinder 6. A rotating cover 7 is inserted and rotated at the upper end of the inner cavity of the sample dividing seat 5, and a sampling cylinder 21 is provided on one side of the upper end of the rotating cover 7; through the provided central rotating cylinder 6, the central rotating cylinder 6 can be sleeved with the fixed sample dividing plate 8, and at the same time, through the convex shaft insertion at the center of the lower end of the rotating cover 7, the rotating cover 7 can be rotated in the sample dividing seat 5, and through the provided sampling cylinder 21, the sampling cylinder 21 can send the collected food sample into the upper end of the sample dividing plate 8.

[0038] In this embodiment, preferably, a plurality of feeding holes are opened at the upper end of the sample dividing plate 8 corresponding to the detection circular hole on the detection base 4, and a cutting knife 9 is fixedly connected to the upper end of each feeding hole; through the provided cutting knife 9, the cutting knife 9 can cut off the lower end of the food sample when the food sample fed by the rotating cover plate 7 rotates, and the cut food sample slices can fall into the heating upper end plate 11 in the detection circular hole on the detection base 4 through the feeding hole.

[0039] In this embodiment, preferably, the outer wall of the upper end of the sampling cylinder 21 is provided with a circle of annular convex edges, and a sample push rod 22 is inserted into the upper end of the inner cavity of the sampling cylinder 21, and a feeding through hole is opened at the upper end of the central rotating cylinder 6 corresponding to the position of the detection through hole on the detection base 4, and the upper end of the feeding through hole is fixedly connected with a threaded connection seat 23, and the lower end of the outer wall of the sampling cylinder 21 is threadedly connected to the threaded connection seat 23; the provided annular convex edge makes it convenient for the sampling cylinder 21 to be pressed into the food to intercept a section of the sample, and the provided sample push rod 22 can squeeze the upper end of the food sample when the sampling cylinder 21 is inserted into the rotating cover 7, so that the lower end of the food sample remains in contact with the upper end of the sample dividing plate 8, thereby ensuring that the cutting knife 9 cuts the sample to the same length.

[0040] In this embodiment, preferably, the heating surface of the semiconductor refrigerator 13 is set upward, and a heating heat conducting plate group 16 is fixedly connected to the heating surface, and a plurality of heating heat pipe heat exchangers 17 are inserted through the heating heat conducting plate group 16. The plurality of heating heat pipe heat exchangers 17 are set corresponding to the heating upper end plate 11, and the outer ends of the heating heat pipe heat exchangers 17 pass through the detection base 4 and are buried in the corresponding position of the heating upper end plate 11. The cooling surface of the semiconductor refrigerator 13 is set downward, and a cooling heat conducting plate group 14 is fixedly connected to the bottom of the cooling surface. A plurality of cooling heat pipe heat exchangers 15 are inserted through the cooling heat conducting plate group 14, and a plurality of The outer end of the cooling heat pipe heat exchanger 15 passes through the detection base 4 and is buried in the liquid collecting cooling seat 12 at the corresponding position; through the provided heating heat conducting plate group 16 and the heating heat pipe heat exchanger 17, the heating heat conducting plate group 16 can assist the heating surface of the semiconductor refrigerator 13 to exchange heat with the heating heat pipe heat exchanger 17, thereby improving the heating speed of the semiconductor refrigerator 13 to the heating upper end plate 11; through the provided cooling heat conducting plate group 14 and the cooling heat pipe heat exchanger 15, the cooling heat conducting plate group 14 can assist the cooling heat pipe heat exchanger 15 in absorbing heat, thereby improving the cooling speed of the liquid collecting cooling seat 12 and improving the processing speed of the sample slices.

[0041] In this embodiment, preferably, the connecting tube 10 is a hollow tubular structure, and a connecting hole is provided in the middle of the heating upper end plate 11 corresponding to the upper end of the connecting tube 10, and the liquid collecting cooling seat 12 is a disc-shaped structure with an open upper end, and a plurality of air outlet holes are evenly provided on the outer wall of the lower end of the connecting tube 10 near the bottom; through the provided connecting tube 10, the volatilized gas after the food sample at the upper end of the heating upper end plate 11 is heated causes the air pressure at the upper end of the heating upper end plate 11 to increase, so that the gas is squeezed into the center of the liquid collecting cooling seat 12 through the lower end of the connecting tube 10, and after contacting and cooling with the liquid collecting cooling seat 12, substances with low boiling points are directly condensed in the liquid collecting cooling seat 12, and formaldehyde has a low boiling point and can flow and disperse in the inner cavity between the heating upper end plate 11 and the liquid collecting cooling seat 12, so that the photoelectrochemical detection probe 18 can detect the formaldehyde content and reduce the interference of water vapor on the detection results.

[0042] In this embodiment, preferably, an annular step is provided at the upper end of the outer wall of the detection base 4, and a rubber sealing ring 20 is fixedly connected to the side wall of the annular step, and a clamping sleeve is fixedly connected to the bottom of the sample dividing seat 5 corresponding to the upper end of the detection base 4, and a plurality of clamping protrusions 19 are fixedly connected to the inner wall of the clamping sleeve at equal intervals; through the provision of the rubber sealing ring 20, the rubber sealing ring 20 can fill the gap between the detection base 4 and the sample dividing seat 5, ensuring the stability and sealing of the connection of the sample dividing seat 5, and through the provision of the plurality of clamping protrusions 19, the plurality of clamping protrusions 19 can be clamped into the rubber sealing ring 20, further improving the firmness of the connection between the detection base 4 and the sample dividing seat 5.

[0043] In this embodiment, preferably, a material receiving and guiding hole 24 is provided at the center between the multiple material discharge holes of the sample dividing plate 8 on the bottom surface of the sample dividing seat 5, and the material discharge holes and the material receiving and guiding holes 24 of the sample dividing plate 8 are both semicircular holes. The bottom of the cutting knife 9 is fixed to the straight edge of the semicircle, and the blade of the cutting knife 9 extends toward the top of the semicircular hole. A rubber sealing gasket is fixedly connected to the bottom surface of the sample dividing seat 5. Through the provided semicircular hole, the semicircular hole can pass through the sample slice, and at the same time, the rubber sealing gasket at the bottom of the sample dividing seat 5 can seal the upper end of the detection circular hole when the sample dividing seat 5 is rotated so that the material receiving and guiding hole 24 is staggered with the detection circular hole.

[0044] In this embodiment, preferably, the rear side of the upper end of the outer box body 1 is fixedly connected with a box cover 25 by a hinge, and the front center of the box cover 25 and the front center of the outer box body 1 are fixedly connected with a duckbill box buckle 26; through the set box cover 25 and duckbill box buckle 26, the box cover 25 can seal the upper end of the outer box body 1 to accommodate the detection equipment, and through the set duckbill box buckle 26, the duckbill box buckle 26 can cooperate with each other to lock and keep the box cover 25 closed, thereby facilitating the movement of the device.

[0045] The working principle and use process of the present invention are as follows: when the device is used, the sampling cylinder 21 is provided, the sampling cylinder 21 can intercept food samples, and the sample dividing seat 5 is provided, the sample dividing seat 5 can divide the sample and put it into the multiple detection holes in the detection base 4, then the sample dividing seat 5 is pulled out, and the angle of the sample dividing seat 5 is rotated so that the material receiving and guiding holes 24 on the bottom surface of the sample dividing seat 5 are staggered with the detection holes on the detection base 4, and the upper ends of the detection holes of the detection base 4 are blocked, and the heating upper end plate 11 in the multiple detection holes of the detection base 4 can heat the food sample slices through the provided detection base 4, so that the formaldehyde and water vapor in the food sample slices are volatilized, and through the provided connecting pipe 10 and the liquid collecting cooling seat 12, The mixed gas of water vapor and formaldehyde at the volatilization point on the upper end of the heating upper end plate 11 is ejected downward from the inner cavity of the liquid collecting cooling seat 12 through the connecting pipe 10. After cooling and condensing by the liquid collecting cooling seat 12, the water vapor is left behind and the formaldehyde is diffused in the inner cavity between the heating upper end plate 11 and the liquid collecting cooling seat 12. The formaldehyde in the middle position of the inner cavity is detected by the photoelectrochemical detection probe 18. The detection results in multiple detection holes correspond to the formaldehyde content at different depths of the food sample, which is consistent with the current situation that the food penetrates from the outside to the inside during formaldehyde treatment. At the same time, the cooperation between the heating upper end plate 11 and the liquid collecting cooling seat 12 accelerates the volatilization of formaldehyde and reduces the influence of water vapor on the detection of the photoelectrochemical detection probe 18, thereby improving the detection efficiency and the detection accuracy.

[0046] See also Figure 7 The above-mentioned method for rapid detection of formaldehyde in food comprises the following steps:

[0047] S1. Insert the sampling tube 21 from the outside of the food sample, then twist and break the sample so that the sample remains in the sampling tube 21 and is taken out, completing sample collection.

[0048] S2. Insert the sample collection tube 21 into the sample push rod 22, which is then fixed to the central rotating cylinder 6 by threaded engagement with the threaded connection seat 23. Press the sample push rod 22 while rotating the central rotating cylinder 6, so that the sample in the sample tube 21 is squeezed against the upper end of the sample dividing plate 8 and is sequentially divided by the multiple cutting blades 9 during rotation, thereby cutting off multiple sample segments.

[0049] S3. The semiconductor refrigerator 13 is started. The heat from the heating surface of the semiconductor refrigerator 13 heats the upper end plate 11 and dries the divided sample on the upper end plate 11, accelerating the volatilization of formaldehyde in the sample. The volatilized formaldehyde carries the evaporated water vapor through the connecting pipe 10 and enters the liquid collecting cooling seat 12. The cooling surface of the semiconductor refrigerator 13 absorbs heat from the liquid collecting cooling seat 12, causing the water vapor to condense into water, which is retained in the liquid collecting cooling seat 12.

[0050] S4, detecting the cooled gas in the middle section by the photoelectrochemical detection probe 18 to determine the formaldehyde concentration;

[0051] S5. The electrical signals detected by the multiple photoelectrochemical detection probes 18 are processed by the analysis and recording terminal 3. The concentration of formaldehyde in the sample is calculated based on the detection results and the standard curve to obtain the corresponding measurement result;

[0052] S6. Analyze the detection results of the multiple photoelectrochemical detection probes 18 to analyze the formaldehyde content results at multiple locations at different depths from the inside to the outside of the food, determine the comprehensive formaldehyde content in the food, and determine whether the food has been treated with formaldehyde;

[0053] S7. Record in detail every step of the test process, experimental conditions, test results and other information, and write a test report.

[0054] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rapid detection device for formaldehyde in food, characterized by: The invention comprises an outer box body (1), wherein a sample detection cavity (2) is provided on one side of the inner cavity of the outer box body (1), and an analysis and recording terminal (3) is fixedly installed on the other side of the outer box body (1), a detection base (4) is fixedly connected to the center of the inner cavity bottom of the sample detection cavity (2), and a sample dividing seat (5) is fixedly sleeved on the upper end of the detection base (4), a plurality of detection circular holes are provided in an array on the upper end of the detection base (4), and a heating upper end plate (11) is fixedly connected to the upper end of the inner wall of the detection circular hole, a connecting pipe (10) is fixedly connected to the bottom center of the heating upper end plate (11), and a liquid collecting cooling seat (12) is fixedly connected to the bottom of the connecting pipe (10), the liquid collecting cooling seat (12) is arranged near the bottom of the detection circular hole, and a semiconductor refrigerator (13) is buried in the detection base (4), a photoelectrochemical detection probe (18) is buried in the middle of the inner wall of the detection circular hole of the detection base (4), and a plurality of photoelectrochemical detection probes (18) are electrically connected to the analysis and recording terminal (3); The center of the inner cavity at the upper end of the sample dividing seat (5) is fixedly connected to a central rotating cylinder (6), and the upper end of the central rotating cylinder (6) is sleeved with a sample dividing plate (8). The upper end of the inner cavity of the sample dividing seat (5) is plugged with a rotating cover (7) for rotation, and a sampling cylinder (21) is provided on one side of the upper end of the rotating cover (7); The upper end of the sample dividing plate (8) is provided with a plurality of feeding holes corresponding to the detection circular holes on the detection base (4), and the upper end of each feeding hole is fixedly connected to a cutting knife (9); The upper outer wall of the sampling cylinder (21) is provided with a ring-shaped convex edge, and the upper end of the inner cavity of the sampling cylinder (21) is provided with a sample push rod (22), the upper end of the central rotating cylinder (6) is provided with a feed through hole corresponding to the position of the detection through hole on the detection base (4), and the upper end of the feed through hole is fixedly connected with a threaded connection seat (23), and the lower end of the outer wall of the sampling cylinder (21) is threadedly connected to the threaded connection seat (23); The heating surface of the semiconductor refrigerator (13) is arranged upward, and a heating heat conducting plate group (16) is fixedly connected to the heating surface. A plurality of heating heat pipe heat exchangers (17) are inserted through the heating heat conducting plate group (16). The plurality of heating heat pipe heat exchangers (17) are arranged corresponding to the heating upper end plate (11), and the outer ends of the heating heat pipe heat exchangers (17) pass through the detection base (4) and are buried in the heating upper end plate (11) at corresponding positions. The cooling surface of the semiconductor refrigerator (13) is arranged downward, and a cooling heat conducting plate group (14) is fixedly connected to the bottom of the cooling surface. A plurality of cooling heat pipe heat exchangers (15) are inserted through the cooling heat conducting plate group (14), and the outer ends of the plurality of cooling heat pipe heat exchangers (15) pass through the detection base (4) and are buried in the liquid collecting cooling seat (12) at corresponding positions.

2. A rapid formaldehyde detection device in food according to claim 1, characterized in that: The connecting pipe (10) is a hollow tubular structure, and a connecting hole is provided in the middle of the heating upper end plate (11) corresponding to the upper end of the connecting pipe (10). The liquid collecting cooling seat (12) is a disc-shaped structure with an open upper end, and a plurality of air outlet holes are evenly provided on the outer wall of the lower end of the connecting pipe (10) near the bottom.

3. A rapid detection device for formaldehyde in food according to claim 2, characterized in that: An annular step is provided at the upper end of the outer wall of the detection base (4), and a rubber sealing ring (20) is fixedly connected to the side wall of the annular step. A clamping sleeve is fixedly connected to the bottom of the sample dividing seat (5) corresponding to the upper end of the detection base (4), and a plurality of clamping protruding teeth (19) are fixedly connected to the inner wall of the clamping sleeve at equal intervals.

4. A rapid formaldehyde detection device in food according to claim 3, characterized in that: The bottom surface of the sample dividing seat (5) is provided with a material receiving and guiding hole (24) at the center between the multiple material discharge holes of the sample dividing plate (8), and the material discharge hole and the material receiving and guiding hole (24) of the sample dividing plate (8) are both semicircular holes. The bottom of the cutting knife (9) is fixed to the straight edge of the semicircle, and the blade of the cutting knife (9) extends toward the top of the semicircular hole. The bottom surface of the sample dividing seat (5) is fixedly connected with a rubber sealing gasket.

5. A rapid formaldehyde detection device in food according to claim 4, characterized in that: The upper rear side of the outer box body (1) is fixedly connected to a box cover (25) via a hinge, and a duckbill box buckle (26) is fixedly connected to the front center of the box cover (25) and the front center of the outer box body (1).

6. A method for rapid detection of formaldehyde in food, using the rapid detection device for formaldehyde in food according to claim 5, characterized in that: It includes the following steps: S1. Use the sampling tube (21) to insert the food sample from the outside, and then twist the sample to make the sample remain in the sampling tube (21) and be taken out, thus completing the sample collection; S2. Insert the sample tube (21) after collecting the sample into the sample push rod (22), and then fix it on the central rotating cylinder (6) by threaded engagement with the threaded connection seat (23). Press the sample push rod (22) while rotating the central rotating cylinder (6) so that the sample in the sample tube (21) is squeezed against the upper end of the sample dividing plate (8). While rotating, the sample is sequentially divided by the multiple cutting blades (9) to cut off multiple sections of the sample. S3, start the semiconductor refrigerator (13), the heat of the heating surface of the semiconductor refrigerator (13) is used to dry the split sample on the upper end plate (11) by heating the upper end plate (11), so that the formaldehyde in the sample is accelerated to volatilize, and the volatilized formaldehyde enters the liquid collecting cooling seat (12) with the evaporated water vapor through the connecting pipe (10), and the cooling surface of the semiconductor refrigerator (13) absorbs heat through the liquid collecting cooling seat (12), so that the water vapor condenses into water and is retained in the liquid collecting cooling seat (12); S4, detecting the cooled gas in the middle section by a photoelectrochemical detection probe (18) to determine the formaldehyde concentration; S5. The electrical signals detected by the plurality of photoelectrochemical detection probes (18) are processed by the analysis and recording terminal (3), and the concentration of formaldehyde in the sample is calculated based on the detection results and the standard curve to obtain the corresponding measurement result; S6. Analyzing the detection results of the multiple photoelectrochemical detection probes (18), thereby analyzing the formaldehyde content results at multiple locations at different depths from the inside to the outside of the food, determining the comprehensive formaldehyde content in the food, and determining whether the food has been treated with formaldehyde; S7. Record in detail every step of the test process, experimental conditions, test results, and prepare a test report.

Images