CN112485245A - Rapid detection device and detection method for pesticide residue of agricultural products - Google Patents
Rapid detection device and detection method for pesticide residue of agricultural products Download PDFInfo
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Abstract
The invention provides a device and a method for rapidly detecting pesticide residue of agricultural products, and the device comprises a device main body, a water tank, a sample extraction device, a liquid preparation transfer device, a detection device, a liquid taking device, a cleaning device and an interaction device, wherein the water tank comprises a water purification tank and a waste water tank, the sample extraction device comprises a sample extraction tank, a sample extraction cavity, an ultrasonic generator, a jacking device, a movable cover, a flushing head and a liquid outlet pipe, the liquid preparation transfer device comprises a rotary base and a liquid preparation cup, the liquid preparation cup comprises a sample transfer cavity, a reference liquid cavity and a cleaning cavity, the detection device comprises a detection tank, a liquid dropping detection plate and a rotary cover liquid plate, and the liquid taking device comprises a lifting column, a rotary head, a telescopic liquid taking arm, a liquid taking head, a liquid taking pipe, a suction pump and a three-way. In a word, the invention has the advantages of novel structure, rapid detection, accurate detection result and the like.
Description
Technical Field
The invention belongs to the technical field of pesticide detection, and particularly relates to a device and a method for rapidly detecting pesticide residues of agricultural products.
Background
The pesticide residue is a general term of trace pesticide protomer, toxic metabolite, degradation product and impurity which are not decomposed and remain in organism, harvest, soil, water body and atmosphere in a period after the pesticide is used. The pesticide applied to the crops is partially attached to the crops, partially scattered in the environment such as soil, atmosphere and water, and part of the pesticide remained in the environment can be absorbed by the plants. The residual pesticide can directly reach the human body and the livestock body through plant fruits or water and atmosphere, or can be finally transferred to the human body and the livestock through the environment and a food chain. The pesticide residue stripper can degrade pesticide residues on the surfaces of fruits and vegetables.
The pesticide enters grains, vegetables, fruits, fish, shrimps, meat, eggs and milk to cause food pollution and harm the health of people. In general, organochlorine pesticides are metabolized slowly in human bodies and accumulate for a long time. Organic chlorine remains in the human body and is mainly concentrated in fat. For example, the content ratio of DDT in blood, brain, liver and fat tissue of a human is 1:4:30: 300; the dieldrin is 1:5:30: 150. Because pesticide residues are harmful to human beings and organisms, the application of pesticides is strictly managed in various countries, and the allowable amount of the pesticide residues in food is regulated. For example, in Japan, a registration system is applied to agricultural chemicals, and once it is confirmed that a certain agricultural chemical is harmful to humans and animals, the government restricts or prohibits the sale and use.
Due to the needs of agricultural production, various pesticides are inevitably used for controlling plant diseases and insect pests. Although the area of the current pollution-free agricultural products, green agricultural products and organic agricultural products is enlarged year by year under the increasing expectations of people, the problem of pesticide residue is still concerned by people and becomes an important index for measuring the safety of pesticides and the quality of agricultural products. Therefore, the invention designs a device and a method for rapidly detecting the pesticide residue of agricultural products.
Disclosure of Invention
Aiming at the existing problems, the invention provides a device and a method for rapidly detecting the pesticide residue of agricultural products.
The technical scheme of the invention is as follows: a rapid detection device for agricultural product pesticide residue mainly comprises a device main body, a water tank, a sample extraction device, a liquid preparation transfer device, a detection device, a liquid taking device, a cleaning device and an interaction device,
the device main body is fixedly arranged on the horizontal table surface, the water tank is arranged at the lower part of the device main body and comprises a clean water tank for storing deionized water and a waste water tank for storing waste water, a flushing pump, a cleaning pump and a pressurizing cleaning pump are arranged in the clean water tank,
the sample extraction device comprises a sample extraction box arranged on the left side above the water tank, a sample extraction cavity arranged inside the sample extraction box, an ultrasonic generator arranged at the bottom outside the sample extraction cavity and used for carrying out ultrasonic cleaning on a sample in the sample extraction cavity, a jacking device arranged at the bottom in the sample extraction cavity and used for lifting the sample in the sample extraction cavity, a movable cover movably arranged above the sample extraction cavity and a flushing head arranged on the inner side surface of the movable cover, wherein the flushing head is connected with the flushing pump through an internal pipeline and used for flushing pesticide residues on the surface of the sample in the sample extraction cavity, a liquid outlet pipe communicated with the sample extraction cavity through an electric control valve is further arranged on the right side of the sample extraction box and used for transferring a sample extracting solution in the sample extraction cavity into the liquid preparation transfer device,
the liquid preparation transfer device comprises a rotary base arranged in the middle of the upper part of the water tank and a liquid preparation cup movably arranged on the rotary base, the liquid preparation cup comprises a sample transfer cavity, a comparison liquid cavity and a cleaning cavity which are arranged adjacently, the sample transfer liquid cavity is used for receiving a sample extracting solution flowing out of the liquid outlet, the comparison liquid cavity is used for storing and detecting the comparison liquid, the cleaning cavity is used for cleaning the liquid taking device, and the cleaning cavity is connected with the waste water tank,
the detection device comprises a detection box arranged on the right side above the water tank, a dropping liquid detection plate arranged on the upper surface of the detection box and a rotary cover liquid plate rotationally connected to the right side of the detection box, the rotary cover liquid plate can rotate to cover the dropping liquid detection plate, a plurality of dropping liquid detection grooves which are arranged in a fan-shaped wave shape are arranged on the dropping liquid detection plate, a plurality of cover pressure seats are arranged on the rotary cover liquid plate corresponding to the dropping liquid detection grooves, cholinesterase test paper is arranged on the inner surface of each dropping liquid detection groove, and indophenol acetate test paper is arranged on the inner surface of each cover pressure seat,
the liquid taking device comprises a lifting column rotatably arranged on the left side of the surface of the detection box, a rotating head sleeved at the upper end of the lifting column, a telescopic liquid taking arm arranged on the side surface of the rotating head in a telescopic way, a liquid taking head arranged at the far end of the telescopic liquid taking arm and a liquid taking pipe arranged on the lower surface of the liquid taking head, wherein a suction pump used for providing suction force for the liquid taking pipe is arranged at the lower end in the lifting column, the liquid taking pipe is connected with the suction pump and a cleaning pump through a three-way valve, the cleaning pump is used for introducing deionized water in the water purification box into the liquid taking pipe to clean the interior of the liquid taking pipe,
the cleaning device comprises a plurality of flushing heads arranged on the lower surface of the liquid taking head, the flushing heads circularly surround the outer side of the liquid taking pipe, the cleaning heads are connected with the pressurizing cleaning pump through the inner pipeline of the lifting column, the liquid spraying directions of the flushing heads face the liquid taking pipe,
the interaction device comprises a touch control screen arranged on the front side surface of the detection box and a controller integrated in the touch control screen, and the controller is respectively connected with the water tank, the sample extraction device, the liquid preparation transfer device, the detection device, the liquid taking device and the cleaning device through relays.
Furthermore, the side surface of the water tank is transparent glass or transparent plastic which can observe the height of the liquid level, so that the control of the water adding amount can be facilitated, and the deionized water can be supplemented into the water purifying tank in time.
Further, waste water tank lateral wall upper portion is equipped with the liquid level monitor that is used for monitoring waste water liquid level height in the waste water tank, the liquid level monitor with the controller is connected for when waste water tank internal waste water is full of liquid, remind operating personnel on the touch control screen through the controller, avoid waste water tank internal waste water to be full of back operating personnel negligence, cause the waste water overflow.
Further, the jacking device is including setting up the waterproof motor that draws the intracavity bottom at the sample and connecting through the lifter the jacking board of waterproof motor upper end, be equipped with a plurality of waterlogging caused by excessive rainfall holes on the jacking board, with agricultural product jacking play sample extract, both can make things convenient for operating personnel to take out agricultural product, avoided agricultural product to soak for a long time again and caused the pesticide to adsorb again in the sample extract.
Further, the drain pipe with sample draws chamber intercommunication department and is equipped with the filter screen that is used for intercepting large granule impurity, avoids agricultural product surface large granule impurity to block up the liquid-taking pipe.
Further, be equipped with on the rotating base and be used for heating the heating device in sample transfer chamber, contrast liquid chamber because sample extract liquid temperature can exert an influence to the measuring result, heats sample extract and contrast liquid to the detection temperature who sets up, avoids causing the measuring result error because of the difference in temperature.
Further, the inside preheating device who is used for preheating test paper on the dropping liquid detection tank that still is equipped with of detection case preheats and can activate the cholinesterase test paper for the testing process.
Furthermore, the dropping liquid detection plate and the rotary liquid covering plate can be detached and cleaned, so that the influence of residual sample extracting solution on the next detection is avoided.
The detection method for detecting the pesticide residue of the agricultural product by using the rapid detection device mainly comprises the following steps:
s1: preparation before detection
Adding deionized water into a clean water tank of the water tank, closing a movable cover, starting a washing pump to wash a sample extraction cavity, discharging the waste water into a washing cavity through a liquid outlet pipe after washing, repeatedly washing for 2-3 times, rotating and descending a liquid taking pipe into the washing cavity, starting the washing pump to wash the interior of the liquid taking pipe for 2-3 times, starting a pressurizing washing pump to wash the surface of the liquid taking pipe for 2-3 times, and starting detection after naturally drying;
s2: extracting pesticide residue on agricultural product surface
Opening a movable cover to put agricultural products into a sample extraction cavity, opening a flushing pump to flush the surfaces of the agricultural products after the movable cover is closed, flushing pesticide residues on the surfaces of the agricultural products, closing the flushing pump after cleaning water submerges the agricultural products, opening an ultrasonic generator, separating the agricultural products along with the pesticide residues on the surfaces of the agricultural products by using ultrasonic waves, closing the ultrasonic generator after the agricultural products are subjected to ultrasonic treatment for 3-5min, opening a jacking device to jack the agricultural products out of sample extracting solution, controlling a liquid preparation cup to rotate through a rotating base, rotating a sample transfer cavity to the lower part of a liquid outlet pipe, then controlling an electric control valve to open to transfer the sample extracting solution into the sample transfer cavity to be detected, and adding deionized water which is homologous with that in a;
s3: residue detection
Starting a preheating device to preheat a dropping liquid detection groove on a dropping liquid detection plate, controlling a liquid taking device to rotate, extending a liquid taking pipe into a control liquid cavity to take control liquid deionized water, then controlling the liquid taking pipe to dropwise add the control liquid deionized water into 3-5 dropping liquid detection grooves on a detection box, then moving the liquid taking pipe into a cleaning cavity, starting a cleaning pump to clean the interior of the liquid taking pipe for 1-2 times, starting a pressurizing cleaning pump to wash the surface of the liquid taking pipe for 1-2 times, then extending the liquid taking pipe into a sample transfer cavity to absorb a sample extracting solution, controlling the liquid taking pipe to dropwise add the sample extracting solution into the rest dropping liquid detection grooves on the detection box, covering a cover pressing seat of a rotary cover liquid plate onto the detection groove of the dropping liquid detection plate after the dropwise adding is finished,
if the sample extracting solution does not contain pesticide residues, the indophenol acetate test paper on the surface of the cover pressure seat rapidly carries out hydrolysis reaction under the catalysis of the cholinesterase test paper on the dropping liquid detection tank to generate blue indophenol and acetic acid,
if the sample extracting solution contains pesticide residues, cholinesterase test paper on the dropping liquid detection tank is combined with the pesticide residues, cholinesterase loses the capability of catalyzing the hydrolysis of indophenol acetate test paper, and blue indophenol and acetic acid cannot be generated;
s4: cleaning and repeat detection
And (5) cleaning the sample extraction cavity and the cleaning pipe according to the method of S1, draining wastewater in the wastewater tank, detaching the dropping liquid detection plate and the rotary cover liquid plate for cleaning, and naturally airing the dropping liquid detection plate and the rotary cover liquid plate for detecting the pesticide residue of the next agricultural product.
The invention has the beneficial effects that: the invention provides a rapid detection device and a detection method for agricultural product pesticide residue, which are particularly suitable for detecting agricultural product pesticide residue in multiple batches, the preparation of a sample extracting solution can be automatically completed only by placing an agricultural product to be detected into a sample extracting box through an arranged sample extracting device, the extracting mode comprises surface washing and ultrasonic separation, so that the pesticide residue on the surface of the agricultural product is separated to the maximum extent, then a solution preparation transfer device is arranged to carry the sample extracting solution, the sample extracting solution and a reference solution are preheated, then the reference solution and the sample extracting solution are respectively absorbed through a solution taking device and are dripped onto a dripping detection plate of the detection box, and whether the pesticide residue is contained in the sample extracting solution or not is judged through the catalytic hydrolysis reaction discoloration of choline esterase test paper and indophenol acetate test paper on a dripping detection tank, the color of the sample extracting solution is changed into blue, so that pesticide residues are naturally left on agricultural products, the deeper the blue is, the smaller the pesticide residue is, the lighter the blue is, the larger the pesticide residue is, and the pesticide residue of the agricultural products can be rapidly judged by comparing the colors. In a word, the invention has the advantages of novel structure, rapid detection, accurate detection result and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the structure within the sample extraction chamber of the present invention;
FIG. 3 is a schematic view of the structure of the dispensing cup of the present invention;
FIG. 4 is a top view of the drip sensing plate of the present invention;
FIG. 5 is a schematic view of the structure of the liquid-extracting device of the present invention.
Wherein, 1-main body, 2-water tank, 21-purified water tank, 211-flushing pump, 212-cleaning pump, 213-pressurizing cleaning pump, 22-waste water tank, 221-liquid level monitor, 3-sample extraction device, 31-sample extraction tank, 32-sample extraction cavity, 33-ultrasonic generator, 34-jacking device, 341-waterproof motor, 342-lifting rod, 343-jacking plate, 35-movable cover, 36-cleaning head, 37-liquid outlet pipe, 371-filter screen, 38-electric control valve, 4-liquid distribution transfer device, 41-rotating base, 411-heating device, 42-liquid distribution cup, 421-sample transfer cavity, 422-reference liquid cavity, 423-cleaning cavity, 5-detection device, 51-detection box, 511-preheating device, 52-dropping detection plate, 521-dropping detection tank, 53-rotary liquid covering plate, 531-covering pressure seat, 6-liquid taking device, 61-lifting column, 62-rotary head, 63-telescopic liquid taking arm, 64-liquid taking head, 65-liquid taking tube, 66-suction pump, 7-cleaning device, 71-flushing head, 8-interaction device, 81-touch control screen and 82-controller.
Detailed Description
For the understanding of the technical solution of the present invention, the following description is further illustrated with reference to fig. 1 to 5 and specific examples, which are not intended to limit the scope of the present invention.
Example (b): as shown in figure 1, a rapid detection device for agricultural product pesticide residue mainly comprises a device main body 1, a water tank 2, a sample extraction device 3, a liquid preparation transfer device 4, a detection device 5, a liquid taking device 6, a cleaning device 7 and an interaction device 8,
the device main body 1 is fixedly arranged on a horizontal table board, the water tank 2 is arranged at the lower part of the device main body 1, the water tank 2 comprises a clean water tank 21 for storing deionized water and a waste water tank 22 for storing waste water, the side surface of the water tank 2 is transparent glass or transparent plastic with the height of liquid level capable of being observed, a washing pump 211, a cleaning pump 212 and a pressurizing cleaning pump 213 are arranged in the clean water tank 21, a liquid level monitor 221 for monitoring the height of the waste water liquid level in the waste water tank 22 is arranged at the upper part of the side wall of the waste water tank 22, the liquid level monitor 221 is connected with the controller 82 and is used for reminding an operator on the touch control screen 81 through the controller 82,
the sample extraction device 3 comprises a sample extraction box 31 arranged on the left side above the water tank 2, a sample extraction cavity 32 arranged inside the sample extraction box 31, an ultrasonic generator 33 arranged at the bottom outside the sample extraction cavity 32 and used for carrying out ultrasonic cleaning on samples in the sample extraction cavity 32, a jacking device 34 arranged at the bottom inside the sample extraction cavity 32 and used for lifting samples in the sample extraction cavity 32, a movable cover 35 movably arranged above the sample extraction cavity 32 and a flushing head 36 arranged on the inner side surface of the movable cover 35, wherein the flushing head 36 is connected with a flushing pump 211 through an internal pipeline, the flushing head 36 is used for flushing pesticide residues on the surface of the samples in the sample extraction cavity 32, a liquid outlet pipe 37 communicated with the sample extraction cavity 32 through an electric control valve 38 is further arranged on the right side of the sample extraction box 31, and the liquid outlet pipe 37 is used for transferring sample extracting liquid in the sample extraction cavity 32 to the liquid distribution transfer device 4, a filter screen 371 used for intercepting large-particle impurities is arranged at the communication part of the liquid outlet pipe 37 and the sample extraction cavity 32,
as shown in fig. 2, the lifting device 34 includes a waterproof motor 341 disposed at the bottom of the sample collection chamber 32 and a lifting plate 343 connected to the upper end of the waterproof motor 341 via a lifting rod 342, the lifting plate 343 having a plurality of drainage holes,
the liquid preparation transfer device 4 comprises a rotary base 41 arranged in the middle of the upper part of the water tank 2 and a liquid preparation cup 42 movably arranged on the rotary base 41, as shown in fig. 3, the liquid preparation cup 42 comprises a sample transfer chamber 421, a contrast chamber 422 and a cleaning chamber 423 which are adjacently arranged, the sample transfer chamber 421 is used for receiving a sample extracting solution flowing out of the liquid outlet 37, the contrast chamber 422 is used for storing a detection contrast solution, the cleaning chamber 423 is used for cleaning the liquid taking device 6, the cleaning chamber 422 is connected with the waste water tank 22, the rotary base 41 is provided with a heating device 411 for heating the sample transfer chamber 421 and the contrast chamber 422,
the detection device 5 comprises a detection box 51 arranged on the right side above the water tank 2, a dropping detection plate 52 arranged on the upper surface of the detection box 51 and a rotary cap liquid plate 53 rotatably connected to the right side of the detection box 51, wherein the rotary cap liquid plate 53 can be rotated to cover and press the dropping detection plate 52, as shown in fig. 4, a plurality of dropping detection grooves 521 arranged in a fan-shaped wave shape are arranged on the dropping detection plate 52, a plurality of cap pressure seats 531 are arranged on the rotary cap liquid plate 53 corresponding to the dropping detection grooves 521, cholinesterase test paper is arranged on the inner surface of the dropping detection groove 521, indophenol acetate test paper is arranged on the inner surface of the cap pressure seats 531, a preheating device 511 for preheating the test paper on the dropping detection groove 521 is further arranged inside the detection box 51, and the dropping detection plate 52 and the rotary,
as shown in fig. 5, the liquid taking device 6 comprises a lifting column 61 rotatably mounted on the left side of the surface of the detection box 51, a rotating head 62 sleeved on the upper end of the lifting column 61, a telescopic liquid taking arm 63 mounted on the side surface of the rotating head 62 in a telescopic manner, a liquid taking head 64 mounted at the far end of the telescopic liquid taking arm 63, and a liquid taking pipe 65 mounted on the lower surface of the liquid taking head 64, a suction pump 66 for providing suction force to the liquid taking pipe 65 is arranged at the lower end inside the lifting column 61, the liquid taking pipe 66 is connected with the suction pump 66 and a cleaning pump 212 through a three-way valve, the cleaning pump 212 is used for introducing deionized water in the purified water tank 21 into the liquid taking pipe 65 to,
the cleaning device 7 comprises a plurality of flushing heads 71 arranged on the lower surface of the liquid taking head 64, the flushing heads 71 circularly surround the outside of the liquid taking pipe 65, the cleaning head 65 is connected with a pressurizing cleaning pump 213 through an internal pipeline of the lifting column 61, the liquid spraying directions of the flushing heads 71 are all towards the liquid taking pipe 65,
the interaction device 8 comprises a touch control screen 81 arranged on the front side surface of the detection box 51 and a controller 82 integrally arranged in the touch control screen 81, wherein the controller 82 is respectively connected with the water tank 2, the sample extraction device 3, the liquid preparation transfer device 4, the detection device 5, the liquid taking device 6 and the cleaning device 7 through relays.
The detection method for detecting the pesticide residue of the agricultural product by using the embodiment mainly comprises the following steps:
s1: preparation before detection
Adding deionized water into a clean water tank 21 of the water tank 2, turning on a washing pump 211 to wash the sample extraction cavity 32 after closing a movable cover 35, discharging the washed wastewater into a washing cavity 423 through a liquid outlet pipe 37, repeatedly washing for 3 times, rotating and descending the liquid taking pipe 65 into the washing cavity 423, turning on a washing pump 212 to wash the interior of the liquid taking pipe 65 for 3 times, turning on a pressurizing washing pump 213 to wash the surface of the liquid taking pipe 65 for 3 times, and starting detection after naturally drying;
s2: extracting pesticide residue on agricultural product surface
Opening a movable cover 35 to put the agricultural product into a sample extraction cavity 32, opening a flushing pump 211 to flush the surface of the agricultural product after closing the movable cover 35, flushing pesticide residues on the surface of the agricultural product, closing the flushing pump 211 after cleaning water is over the agricultural product, opening an ultrasonic generator 33, separating the agricultural product with the pesticide residues on the surface of the agricultural product by using ultrasonic waves, closing the ultrasonic generator 33 after performing ultrasonic treatment for 5min, opening a jacking device 34 to jack the agricultural product out of a sample extracting solution, controlling a liquid preparation cup 42 to rotate through a rotating base 41, rotating a sample transfer cavity 421 to the lower side of a liquid outlet pipe 37, then controlling an electric control valve 38 to open to transfer the sample extracting solution into a sample transfer cavity 421 to be detected, and adding deionized water which is homologous with the water in a water purification tank 21 into a reference liquid cavity 422;
s3: residue detection
Starting a preheating device 511 to preheat the dropping detection groove 521 on the dropping detection plate 52, controlling a liquid taking device 7 to rotate to extend a liquid taking pipe 65 to the dropping detection groove 521 of the dropping detection plate 52 to take contrast deionized water, then controlling the liquid taking pipe 65 to drop contrast deionized water to 3-5 dropping detection grooves 521 on the detection box 51, then moving the liquid taking pipe 65 to the cleaning cavity 423, starting a cleaning pump 212 to clean the interior of the liquid taking pipe 65 for 1-2 times, starting a pressurizing cleaning pump 213 to wash the surface of the liquid taking pipe 65 for 2 times, then extending the liquid taking pipe 65 to the sample transfer cavity 421 to take a sample of the extract, controlling the liquid taking pipe 65 to drop the sample of the sample extraction liquid to the rest dropping detection grooves 521 on the detection box 51, and pressing a cover pressure seat 531 of a rotary cover liquid plate 53 to the dropping detection groove 521 of the dropping detection plate 52 after the dropping is finished,
if the sample extracting solution does not contain pesticide residues, the indophenol acetate test paper on the surface of the cover pressure seat 531 is catalyzed by the cholinesterase test paper on the dropping liquid detection tank 521 to quickly generate hydrolysis reaction to generate blue indophenol and acetic acid,
if the sample extracting solution contains pesticide residues, cholinesterase test paper on the dropping liquid detection tank 521 is combined with the pesticide residues, cholinesterase loses the capability of catalyzing hydrolysis of indophenol acetate test paper, and blue indophenol and acetic acid cannot be generated;
s4: cleaning and repeat detection
And (5) cleaning the sample extraction cavity 32 and the cleaning pipe 65 according to the method of S1, draining the wastewater in the wastewater tank 22, detaching the dropping detection plate 52 and the rotary liquid cover plate 53 for cleaning, and naturally airing the dropping detection plate and the rotary liquid cover plate for detecting the pesticide residue of the next agricultural product.
Experimental example: study of the detection Capacity of the detection device of the invention
Detecting an object: selecting 3 grapevines which have not been sprayed with pesticide, respectively selecting 2 bunches of grapevines with similar size and shape on the 3 grapevines,
uniformly spraying deionized water to the 2 bunches of grapes on the 1 st grape vine within 1 week for 3 times every day, wherein the spraying amount is 100ml each time,
uniformly spraying pesticide solution with pesticide content of 10% to 2 bunch of grapes on the 2 nd grape vine within 1 week for 3 times per day with spraying amount of 100ml each time,
uniformly spraying pesticide liquid with the pesticide content of 30% to 2 bunches of grapes on the 3 rd grape vine within 1 week for 3 times every day, wherein the spraying amount is 100 ml.
An experimental instrument: the embodiment of the invention provides 1 quick detection device and 1 commercially available HC-NC08 pesticide residue detector.
The experimental conditions are as follows: spraying deionized water or pesticide liquid to 3 grapevines for 1 week, stopping spraying, standing for 3d under the same condition, shearing 2 bunches of grapevines selected from each grapevine, shearing the lower end of each bunch of grapevines for 5cm for use,
firstly, 2 bunches of grape cutting segments on the 1 st grape tree are respectively placed into the rapid detection device and a commercially available HC-NC08 pesticide residue detector provided by the embodiment of the invention for pesticide residue detection, the detection result is recorded,
then cleaning the instrument, respectively placing 2 bunches of grape scissoring segments on the 2 nd grape vine into the rapid detection device and a commercially available HC-NC08 pesticide residue detector provided by the embodiment of the invention for pesticide residue detection, recording the detection result,
after cleaning the instrument, 2 bunches of grape scissoring segments on the 3 rd grape vine are respectively placed into the rapid detection device and a commercially available HC-NC08 pesticide residue detector provided by the embodiment of the invention for pesticide residue detection, the detection result is recorded,
comparing the detection results of the rapid detection device provided by the embodiment of the invention and the commercially available HC-NC08 pesticide residue detector, the results are shown in Table 1:
TABLE 1 comparison table of pesticide residue content test results
And (4) experimental conclusion: the grapes sprayed with deionized water are used as a comparison group to verify that the rapid detection device provided by the embodiment of the invention and the commercial HC-NC08 pesticide residue detector have normal working states and can be used as experimental instruments, and then the pesticide residue amounts of the grapes sprayed with pesticide liquid with the concentration of 10% and 30% are respectively detected, and the table 1 can clearly show that the rapid detection device provided by the embodiment of the invention has shorter detection time and more accurate detection result, and is obviously superior to the commercial HC-NC08 pesticide residue detector.
Claims (9)
1. A rapid detection device for agricultural product pesticide residue is characterized by mainly comprising a device main body (1), a water tank (2), a sample extraction device (3), a liquid preparation transfer device (4), a detection device (5), a liquid taking device (6), a cleaning device (7) and an interaction device (8),
the device main body (1) is fixedly arranged on a horizontal table board, the water tank (2) is arranged at the lower part of the device main body (1), the water tank (2) comprises a purified water tank (21) for storing deionized water and a wastewater tank (22) for storing wastewater, a flushing pump (211), a cleaning pump (212) and a pressurizing cleaning pump (213) are arranged in the purified water tank (21),
the sample extraction device (3) comprises a sample extraction box (31) arranged on the left side above the water tank (2), a sample extraction cavity (32) arranged inside the sample extraction box (31), an ultrasonic generator (33) arranged at the outer bottom of the sample extraction cavity (32) and used for carrying out ultrasonic cleaning on a sample in the sample extraction cavity (32), a jacking device (34) arranged at the inner bottom of the sample extraction cavity (32) and used for lifting the sample in the sample extraction cavity (32), a movable cover (35) movably arranged above the sample extraction cavity (32) and a flushing head (36) arranged on the inner side surface of the movable cover (35), wherein the flushing head (36) is connected with the flushing pump (211) through an internal pipeline, the flushing head (36) is used for flushing pesticide residues on the surface of the sample in the sample extraction cavity (32), and a liquid outlet pipe (37) communicated with the sample extraction cavity (32) through an electric control valve (38) is further arranged on the right side of the sample extraction box (31), the liquid outlet pipe (37) is used for transferring the sample extracting solution in the sample extracting cavity (32) to the solution preparing transfer device (4),
the liquid preparation transfer device (4) comprises a rotating base (41) arranged in the middle of the upper part of the water tank (2) and a liquid preparation cup (42) movably arranged on the rotating base (41), the liquid preparation cup (42) comprises a sample transfer cavity (421), a contrast liquid cavity (422) and a cleaning cavity (423) which are adjacently arranged, the sample transfer liquid cavity (421) is used for receiving a sample extracting solution flowing out of the liquid outlet (37), the contrast liquid cavity (422) is used for storing a detection contrast liquid, the cleaning cavity (423) is used for cleaning the liquid taking device (6), and the cleaning cavity (422) is connected with the waste water tank (22),
detection device (5) is including setting up detection case (51), the setting on water tank (2) top right side are in the dropping liquid pick-up plate (52) and the swivelling joint of detection case (51) upper surface are in rotatory cap sap plate (53) on detection case (51) right side, rotatory cap sap plate (53) are rotatable to the lid and are pressed on dropping liquid pick-up plate (52), be equipped with on dropping liquid pick-up plate (52) and be fan-shaped wavy a plurality of dropping liquid detection grooves (521) of arranging, correspond on rotatory cap sap plate (53) dropping liquid detection groove (521) are equipped with a plurality of lid pressure seats (531), dropping liquid detection groove (521) internal surface is equipped with cholinesterase test paper, lid pressure seat (531) internal surface is equipped with indophenol acetate test paper,
the liquid taking device (6) comprises a lifting column (61) arranged on the left side of the surface of the detection box (51), a rotating head (62) sleeved on the upper end of the lifting column (61), a telescopic liquid taking arm (63) telescopic on the side of the rotating head (62), a liquid taking head (64) arranged at the far end of the telescopic liquid taking arm (63) and a liquid taking pipe (65) arranged on the lower surface of the liquid taking head (64), wherein a suction pump (66) used for providing suction force for the liquid taking pipe (65) is arranged at the lower end inside the lifting column (61), the liquid taking pipe (66) is connected with the suction pump (66) and a cleaning pump (212) through a three-way valve, the cleaning pump (212) is used for introducing deionized water into the liquid taking pipe (65) in the water purification box (21) to clean the inside of the liquid taking pipe (65),
the cleaning device (7) comprises a plurality of flushing heads (71) arranged on the lower surface of the liquid taking head (64), the flushing heads (71) circularly surround the outer side of the liquid taking pipe (65), the cleaning head (65) is connected with the pressurizing cleaning pump (213) through an internal pipeline of the lifting column (61), and the liquid spraying directions of the flushing heads (71) face the liquid taking pipe (65),
interaction device (8) are including setting up touch control screen (81) and the integrated setting of detection case (51) leading flank are in controller (82) inside touch control screen (81), controller (82) respectively through the relay with water tank (2), sample extraction element (3), join in marriage liquid transfer device (4), detection device (5), get liquid device (6), belt cleaning device (7) and connect.
2. The device for rapidly detecting the pesticide residue on agricultural products of claim 1, wherein the side surface of the water tank (2) is transparent glass or transparent plastic with a liquid level height capable of being observed.
3. The device for rapidly detecting the pesticide residue of agricultural products as claimed in claim 1, wherein the jacking device (34) comprises a waterproof motor (341) arranged at the bottom in the sample extraction cavity (32) and a jacking plate (343) connected to the upper end of the waterproof motor (341) through a lifting rod (342), and a plurality of draining holes are arranged on the jacking plate (343).
4. The device for rapidly detecting the pesticide residue on agricultural products as claimed in claim 1, wherein a filter screen (371) for intercepting large-particle impurities is arranged at the communication position of the liquid outlet pipe (37) and the sample extraction cavity (32).
5. The device for rapidly detecting the pesticide residue in the agricultural products according to claim 1, wherein a heating device (411) for heating the sample transfer chamber (421) and the control liquid chamber (422) is arranged on the rotating base (41).
6. The device for rapidly detecting the pesticide residue in the agricultural products as claimed in claim 1, wherein a heating device (411) for heating the sample transferring cavity (421) is arranged on the rotating base (41).
7. The device for rapidly detecting the pesticide residue on agricultural products as claimed in claim 1, wherein a preheating device (511) for preheating the test paper on the dropping liquid detection tank (521) is further arranged in the detection box (51).
8. The device for rapidly detecting the pesticide residue on agricultural products as claimed in claim 1, wherein the dropping detection plate (52) and the rotary cap liquid plate (53) are both detachable and cleanable.
9. The method for detecting the pesticide residue of agricultural products by using the rapid detection device of any one of claims 1 to 8 is characterized by mainly comprising the following steps:
s1: preparation before detection
Adding deionized water into a purified water tank (21) of a water tank (2), turning off a movable cover (35), then starting a washing pump (211) to wash a sample extraction cavity (32), discharging the washed wastewater into a washing cavity (423) through a liquid outlet pipe (37), repeatedly washing for 2-3 times, rotatably descending a liquid taking pipe (65) into the washing cavity (423), starting a washing pump (212) to wash the interior of the liquid taking pipe (65) for 2-3 times, starting a pressurizing washing pump (213) to wash the surface of the liquid taking pipe (65) for 2-3 times, and naturally airing and then starting detection;
s2: extracting pesticide residue on agricultural product surface
Opening a movable cover (35) to place the agricultural product into a sample extraction cavity (32), opening a flushing pump (211) to flush the surface of the agricultural product after closing the movable cover (35), flushing pesticide residues on the surface of the agricultural product, closing the flushing pump (211) after the cleaning water is over the agricultural product, opening an ultrasonic generator (33), separating the ultrasonic wave along with the pesticide residues on the surface of the agricultural product, closing the ultrasonic generator (33) after carrying out ultrasonic treatment for 3-5min, opening a jacking device (34) to jack the agricultural product out of a sample extracting solution, the sample transferring cavity (421) is rotated to the lower part of the liquid outlet pipe (37) by controlling the liquid preparing cup (42) to rotate through the rotating base (41), then the electric control valve (38) is controlled to be opened to transfer the sample extracting solution into the sample transfer cavity (421) to be detected, and deionized water which is homologous with the deionized water in the purified water tank (21) is added into the reference liquid cavity (422);
s3: residue detection
Starting a preheating device (511) to preheat a dropping liquid detection groove (521) on a dropping liquid detection plate (52), controlling a liquid taking device (7) to rotate to extend a liquid taking pipe (65) into a contrast liquid cavity (422) to absorb contrast liquid deionized water, then controlling the liquid taking pipe (65) to dropwise add the contrast liquid deionized water into 3-5 dropping liquid detection grooves (521) on a detection box (51), then moving the liquid taking pipe (65) into a cleaning cavity (423), starting a cleaning pump (212) to clean the interior of the liquid taking pipe (65) for 1-2 times, starting a pressurizing cleaning pump (213) to wash the surface of the liquid taking pipe (65) for 1-2 times, then extending the liquid taking pipe (65) into a sample transfer cavity (421) to absorb a sample extracting solution, controlling the liquid taking pipe (65) to dropwise add the sample extracting solution into the rest dropping liquid detection grooves (521) on the detection box (51), and pressing a cover pressing seat (531) of a rotary cover liquid plate (53) to cover the dropping liquid detection groove (521) of the dropping liquid detection plate (52) after the dropping detection plate On the groove (521) of the groove (521),
if the sample extracting solution does not contain pesticide residues, indophenol acetate test paper on the surface of the cover pressing seat (531) is rapidly hydrolyzed under the catalysis of cholinesterase test paper on the dropping liquid detection tank (521) to generate blue indophenol and acetic acid,
if the sample extracting solution contains pesticide residues, cholinesterase test paper on the dropping liquid detection tank (521) is combined with the pesticide residues, cholinesterase loses the capability of catalyzing hydrolysis of indophenol acetate test paper, and blue indophenol and acetic acid cannot be generated;
s4: cleaning and repeat detection
And (2) cleaning the sample extraction cavity (32) and the cleaning pipe (65) according to the method of S1, draining wastewater in the wastewater tank (22), detaching the dropping detection plate (52) and the rotary liquid cover plate (53) for cleaning, and naturally airing for detecting the pesticide residue of the next agricultural product.
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Effective date of registration: 20230803 Address after: Wang Gou Zhen Xiao Xing Hua Cun, Lanshan District, Linyi City, Shandong Province, 273408 Patentee after: Shandong Huijin Modern Agricultural Technology Co.,Ltd. Address before: 276000 west side of north section of Industrial Road, Lanshan District, Linyi, Shandong Patentee before: LINYI University |