CN111679044A - Method for detecting residual pesticide in fruits and vegetables - Google Patents
Method for detecting residual pesticide in fruits and vegetables Download PDFInfo
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- CN111679044A CN111679044A CN202010683036.XA CN202010683036A CN111679044A CN 111679044 A CN111679044 A CN 111679044A CN 202010683036 A CN202010683036 A CN 202010683036A CN 111679044 A CN111679044 A CN 111679044A
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- 235000012055 fruits and vegetables Nutrition 0.000 title claims abstract description 59
- 239000000575 pesticide Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 238000003860 storage Methods 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000000447 pesticide residue Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000008234 soft water Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 11
- 235000013399 edible fruits Nutrition 0.000 description 5
- 235000013311 vegetables Nutrition 0.000 description 3
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 2
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
- 239000012488 sample solution Substances 0.000 description 2
- 239000011782 vitamin Substances 0.000 description 2
- 235000013343 vitamin Nutrition 0.000 description 2
- 229940088594 vitamin Drugs 0.000 description 2
- 229930003231 vitamin Natural products 0.000 description 2
- 244000241257 Cucumis melo Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- UDIPTWFVPPPURJ-UHFFFAOYSA-M Cyclamate Chemical compound [Na+].[O-]S(=O)(=O)NC1CCCCC1 UDIPTWFVPPPURJ-UHFFFAOYSA-M 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000625 cyclamic acid and its Na and Ca salt Substances 0.000 description 1
- HEBKCHPVOIAQTA-NGQZWQHPSA-N d-xylitol Chemical compound OC[C@H](O)C(O)[C@H](O)CO HEBKCHPVOIAQTA-NGQZWQHPSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 235000013325 dietary fiber Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229960001462 sodium cyclamate Drugs 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
- G01N33/025—Fruits or vegetables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Food Science & Technology (AREA)
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Abstract
The invention relates to the field of fruit and vegetable pesticide detection, in particular to a method for detecting residual pesticide in fruits and vegetables. The invention has simple structure and convenient operation, is convenient to disassemble each part through the design of the cylinder body and the top cover, improves the cleaning convenience, is beneficial to improving the cleaning effect through the rotation of the cylinder body and the sealing plate, is convenient to improve the detection accuracy during subsequent detection, and is convenient for using detection equipment; the storage tank is conveniently sealed through the design of the sealing plate, so that the influence on the detection of the sample liquid caused by the fact that the sample liquid is excessively exposed in the air during detection is avoided, the cylinder body is limited through the sealing plate, the sample liquid is conveniently manufactured, and the convenience in operation is improved.
Description
Technical Field
The invention relates to the field of fruit and vegetable pesticide detection, in particular to a method for detecting residual pesticide in fruits and vegetables.
Background
The fruits and vegetables are fruits and vegetables, the vegetables and the fruits are main components of food in the diet of residents in China, the fruits and the vegetables are rich in vitamins, inorganic salts and dietary fibers which are necessary for human bodies, and contain little protein and fat. Fruit and vegetable nutrients: the concentrated fruits and vegetables supplement you with sufficient vitamins and minerals that they actively participate in the human life process and are continuously consumed.
The main raw materials of the existing fruits and vegetables are plant concentrates, tea polyphenol, xylo-oligosaccharide, sodium cyclamate, magnesium stearate and the like, pesticides are required to be sprayed to prevent insect pests when the fruits and vegetables grow, the health of a user is possibly affected due to higher pesticide content after the fruits and vegetables grow, even life danger is caused, the pesticide concentration of the fruits and vegetables needs to be detected, the fruits and vegetables are not broken during detection, equipment is not cleaned after the detection is finished, the operation difficulty is increased, and the accuracy of subsequent detection is reduced; and the exposure of the detection sample solution may cause the accuracy of detection to be reduced during detection, which is not favorable for the preservation of the detection sample solution. Therefore, the method for detecting the residual pesticide in the fruits and vegetables is provided aiming at the problems.
Disclosure of Invention
The invention aims to solve the problems and provide a method for detecting residual pesticides in fruits and vegetables.
The invention realizes the aim through the following technical scheme, and a detection method of residual pesticides in fruits and vegetables comprises the following steps:
s1: firstly, randomly selecting samples from fruits and vegetables to be detected, wherein the number of the samples is not less than four groups, and the four groups of detected fruits and vegetables are far away from each other as far as possible, or different batches can be selected, so that the detected data value is more comprehensive, and the accuracy is higher;
s2: respectively cutting four groups of fruits and vegetables into pieces, wherein the inner parts and the outer parts of the fruits and vegetables are reserved in the cutting process, then sequentially putting the four groups of fruits and vegetables into testing equipment in batches for testing, wherein the liquid in the fruits and vegetables is required to be fully squeezed out in the testing process, and meanwhile, the residues of the fruits and vegetables are required to be filtered;
s3: sequentially detecting the liquid extruded in the step S2 to obtain a detection value, and fully washing the testing equipment between the detection of two adjacent groups of fruits and vegetables to ensure that no medicine residue exists in the equipment and prevent the detection cross influence;
s4: after four groups of detection data are obtained, comparing the four groups of data, then removing the lowest value of the four groups of data, calculating other three groups of data, taking an average value as a final detection result, and judging that the pesticide residue content is unqualified when any group of data in the three groups of data detects that the pesticide residue content exceeds the standard;
the detection device used in the step S1 comprises a cylinder body positioned at the top of the bottom plate, a connecting mechanism and a sealing mechanism; the connecting mechanism comprises a vertical rod and a top cover, the top of the bottom plate is fixedly connected with the vertical rod, the top end of the vertical rod is rotatably connected with the rotating shaft, the rotating shaft is fixedly connected with the outer wall of the cylinder, the outer surface of the cylinder is fixedly connected with the extending block, the top of the cylinder is sleeved with the top cover, the top cover is provided with a clamping groove, the middle of the top rod is in penetrating connection with the screw rod, two ends of the screw rod are respectively fixedly connected with the handle and the pressing plate, and the edge of the pressing plate is fixedly connected; the sealing mechanism comprises a sealing plate and a mounting plate, a storage groove is formed in the top surface of the bottom plate, one side of the top surface of the bottom plate is rotatably connected with the sealing plate, the inner wall of the sealing plate is fixedly connected with the mounting plate, the mounting plate is fixedly connected with the filter screen, a flow guide hole is formed in the side end of the bottom plate, and the side end of the flow guide hole is in threaded connection with the end cover.
Preferably, the bottom end of the cylinder body is provided with a notch, and the bottom end of the cylinder body is positioned in the storage groove formed in the top surface of the bottom plate.
Preferably, the top surface of the bottom plate is provided with a storage tank for sample liquid detection, the storage tank is fixedly connected with the detector, and one side of the top surface of the bottom plate is fixedly connected with the display screen.
Preferably, the top surface of the bottom plate is fixedly connected with a fixing plate, the top of the fixing plate is fixedly connected with a soft water pipe, and the end part of the water pipe is fixedly connected with the spray head.
Preferably, the cross section of the top cover is of a U-shaped structure, two clamping grooves which are of an L-shaped structure are formed in the bottom end of the top cover, and the two clamping grooves are clamped with the extension block.
Preferably, the screw rod is in threaded connection with the middle of the top cover, and the circular pressing plate at the bottom end of the screw rod is in sliding connection with the inside of the circular cylinder.
Preferably, the sealing ring is of a circular ring-shaped structure, the maximum diameter of the circle of the sealing ring is larger than the diameter of the pressing plate, and the sealing ring is connected with the inner wall of the cylinder body in a sealing and sliding mode.
Preferably, the recess that is used for the mounting panel to remove is offered at the storage tank middle part, the mounting panel is square hollow structure, just the mounting panel is connected with the laminating of storage tank bottom surface and side.
Preferably, the end part of the sealing plate is provided with a semicircular opening, the end part of the sealing plate is attached to the outer wall of the cylinder, and the bottom end of the cylinder is in contact with the inner wall of the storage groove with one side in a semicircular structure.
Preferably, the end cover is sleeved with an extension pipe on the side wall of the bottom plate, the extension pipe is communicated with the flow guide hole, and the flow guide pipe is communicated with the inside of the storage tank.
The invention has the beneficial effects that:
(1) the invention has simple structure and convenient operation, is convenient to disassemble each part through the design of the cylinder body and the top cover, improves the cleaning convenience, is beneficial to improving the cleaning effect through the rotation of the cylinder body and the sealing plate, is convenient to improve the detection accuracy during subsequent detection, and is convenient for using detection equipment;
(2) the storage tank is conveniently sealed through the design of the sealing plate, so that the influence on the detection of the sample liquid caused by the fact that the sample liquid is excessively exposed in the air during detection is avoided, the cylinder body is limited through the sealing plate, the sample liquid is conveniently manufactured, and the convenience in operation is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flow chart of the detection method of the present invention;
FIG. 2 is a schematic diagram of a front view of a test apparatus used in the present invention;
FIG. 3 is a schematic side view of a testing apparatus used in the present invention;
FIG. 4 is a schematic top view of a test apparatus used in the present invention with the mounting plate open;
FIG. 5 is a schematic top view of the test apparatus used in the present invention with the mounting plate open;
in the figure: 1. the device comprises a bottom plate, 2, a barrel, 3, a vertical rod, 4, a rotating shaft, 5, an extending block, 6, a top cover, 7, a clamping groove, 8, a screw rod, 9, a handle, 10, a pressing plate, 11, a sealing ring, 12, a storage groove, 13, a detector, 14, a display screen, 15, a sealing plate, 16, a mounting plate, 17, a filter screen, 18, a flow guide hole, 19, an end cover, 20, a fixing plate, 21, a water pipe, 22 and a spray head.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, 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, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1-5, a method for detecting pesticide residues in fruits and vegetables includes the following steps:
s1: firstly, randomly selecting samples from fruits and vegetables to be detected, wherein the number of the samples is not less than four groups, and the four groups of detected fruits and vegetables are far away from each other as far as possible, or different batches can be selected, so that the detected data value is more comprehensive, and the accuracy is higher;
s2: respectively cutting four groups of fruits and vegetables into pieces, wherein the inner parts and the outer parts of the fruits and vegetables are reserved in the cutting process, then sequentially putting the four groups of fruits and vegetables into testing equipment in batches for testing, wherein the liquid in the fruits and vegetables is required to be fully squeezed out in the testing process, and meanwhile, the residues of the fruits and vegetables are required to be filtered;
s3: sequentially detecting the liquid extruded in the step S2 to obtain a detection value, and fully washing the testing equipment between the detection of two adjacent groups of fruits and vegetables to ensure that no medicine residue exists in the equipment and prevent the detection cross influence;
s4: after four groups of detection data are obtained, comparing the four groups of data, then removing the lowest value of the four groups of data, calculating other three groups of data, taking an average value as a final detection result, and judging that the pesticide residue content is unqualified when any group of data in the three groups of data detects that the pesticide residue content exceeds the standard;
the detection device used in the step S1 comprises a cylinder body 2 positioned at the top of a bottom plate 1, a connecting mechanism and a sealing mechanism; the connecting mechanism comprises a vertical rod 3 and a top cover 6, the top of the bottom plate 1 is fixedly connected with the vertical rod 3, the top end of the vertical rod 3 is rotatably connected with a rotating shaft 4, the rotating shaft 4 is fixedly connected with the outer wall of the barrel 2, the outer surface of the barrel 2 is fixedly connected with an extending block 5, the top of the barrel 2 is sleeved with the top cover 6, the top cover 6 is provided with a clamping groove 7, the middle part of the top rod is connected with a screw 8 in a penetrating manner, two ends of the screw 8 are respectively fixedly connected with a handle 9 and a pressing plate 10, and the edge of the pressing plate 10 is fixedly connected with; sealing mechanism includes closing plate 15 and mounting panel 16, storage tank 12 has been seted up to 1 top surface of bottom plate, 1 top surface one side of bottom plate rotates with closing plate 15 to be connected, and closing plate 15 inner wall and mounting panel 16 fixed connection, the inside and filter screen 17 fixed connection of mounting panel 16, the inside water conservancy diversion hole 18 that has seted up of 1 side of bottom plate, and water conservancy diversion hole 18 side and end cover 19 threaded connection.
The bottom end of the cylinder body 2 is provided with a notch, and the bottom end of the cylinder body 2 is positioned in the storage groove 12 formed in the top surface of the bottom plate 1, so that fruits and vegetables can be conveniently crushed, and sample liquid can conveniently enter the storage groove 12; a storage tank 12 for sample liquid detection is formed in the top surface of the bottom plate 1, the interior of the storage tank 12 is fixedly connected with a detector 13, and one side of the top surface of the bottom plate 1 is fixedly connected with a display screen 14, so that the fruit and vegetable pesticide can be conveniently detected; the top surface of the bottom plate 1 is fixedly connected with a fixing plate 20, the top of the fixing plate 20 is fixedly connected with a soft water pipe 21, and the end part of the water pipe 21 is fixedly connected with a spray head 22, so that equipment is convenient to clean and operate; the cross section of the top cover 6 is of a U-shaped structure, two clamping grooves 7 of an L-shaped structure are formed in the bottom end of the top cover 6, and the insides of the two clamping grooves 7 are clamped with the extension block 5, so that the top cover 6 is convenient to limit and the top cover 6 is convenient to detach; the screw 8 is in threaded connection with the middle of the top cover 6, and the circular pressing plate 10 at the bottom end of the screw 8 is in sliding connection with the inside of the circular cylinder 2, so that the pressing plate 10 can move conveniently, and fruits and vegetables can be crushed conveniently; the sealing ring 11 is of a circular ring-shaped structure, the maximum diameter of the circle of the sealing ring 11 is larger than that of the pressing plate 10, and the sealing ring 11 is in sealing sliding connection with the inner wall of the cylinder 2, so that the pressing plate 10 is convenient to seal, and juice is prevented from entering the top of the cylinder 2; a groove for moving the mounting plate 16 is formed in the middle of the storage tank 12, the mounting plate 16 is of a square hollow structure, and the mounting plate 16 is attached to the bottom surface and the side surface of the storage tank 12, so that the mounting plate 16 is convenient to limit, and fruits and vegetables can be conveniently filtered after being crushed; the end part of the sealing plate 15 is provided with a semicircular opening, the end part of the sealing plate 15 is connected with the outer wall of the cylinder 2 in a fitting manner, and the bottom end of the cylinder 2 is contacted with the inner wall of the storage groove 12 with one side in a semicircular structure, so that the sealing of the sealing plate 15 is facilitated, and the influence on the precision of sample liquid detection is avoided; the end cover 19 is sleeved with an extension pipe on the side wall of the bottom plate 1, the extension pipe is communicated with the flow guide hole 18, and the flow guide pipe is communicated with the inside of the storage tank 12, so that the end cover 19 is convenient to seal, and the sample liquid in the storage tank 12 is convenient to discharge.
When the fruit storage device is used, melons and fruits to be detected are placed inside the barrel body 2, the top cover 6 is sleeved on the top of the barrel body 2, the clamping groove 7 is moved to the extending block 5, the top cover 6 is rotated by a certain angle to limit the top cover 6, the sealing plate 15 is rotated, the sealing plate 15 rotates around the end of the sealing plate to seal the top surface of the storage groove 12, the sealing plate 15 rotates to a horizontal position, the semicircular opening in the end of the sealing plate 15 abuts against the bottom surface of the barrel body 2, the sealing of the top surface of the storage groove 12 is facilitated while the barrel body 2 is limited, and the detection accuracy is prevented from being influenced by the fact that air contacts sample liquid; after the operation is finished, the handle 9 is rotated to drive the screw 8 to rotate and then vertically move, the pressing plate 10 is driven to move simultaneously, then the fruits and vegetables are extruded and crushed, the pressing plate 10 drives the sealing ring 11 to move simultaneously when moving, sample liquid is prevented from entering the top of the cylinder body 2, the sealing plate 15 drives the mounting plate 16 to rotate simultaneously when rotating to be horizontal, and then the mounting plate 16 is driven to be pressed tightly at the middle part of the storage tank 12 to separate the two sides of the storage tank 12, the squeezed and crushed juice flows to the inside of the storage tank 12, then flows to the left side of the storage tank 12 after passing through the filter screen 17 at the middle part of the mounting plate 16, the design of the filter screen 17 avoids the influence of the insufficient crushing of the fruits and vegetables on the detection of the pesticide, after the pesticide components in the sample liquid are detected by the detector 13, the detected data is processed by the processor and then displayed on the display screen 14, so that the operation is convenient; after the operation is accomplished, unscrew end cover 19, make water conservancy diversion hole 18 communicate, discharge the appearance liquid, open closing plate 15 back, rotate barrel 2 and take out the back with the fruit vegetables, water pipe 21 intercommunication water source through external water source, wash storage tank 12 and filter screen 17 after the spout water source of shower nozzle 22 department, when needing to dismantle clamp plate 10 and wash alone, only need rotate top cap 6, make draw-in groove 7 and extension piece 5 after-separating, take out top cap 6 and clamp plate 10, make things convenient for the inside washing of barrel 2, conveniently operate.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for detecting residual pesticides in fruits and vegetables is characterized by comprising the following steps: the detection method comprises the following steps:
s1: firstly, randomly selecting samples from fruits and vegetables to be detected, wherein the number of the samples is not less than four groups, and the four groups of detected fruits and vegetables are far away from each other as far as possible, or different batches can be selected, so that the detected data value is more comprehensive, and the accuracy is higher;
s2: respectively cutting four groups of fruits and vegetables into pieces, wherein the inner parts and the outer parts of the fruits and vegetables are reserved in the cutting process, then sequentially putting the four groups of fruits and vegetables into testing equipment in batches for testing, wherein the liquid in the fruits and vegetables is required to be fully squeezed out in the testing process, and meanwhile, the residues of the fruits and vegetables are required to be filtered;
s3: sequentially detecting the liquid extruded in the step S2 to obtain a detection value, and fully washing the testing equipment between the detection of two adjacent groups of fruits and vegetables to ensure that no medicine residue exists in the equipment and prevent the detection cross influence;
s4: after four groups of detection data are obtained, comparing the four groups of data, then removing the lowest value of the four groups of data, calculating other three groups of data, taking an average value as a final detection result, and judging that the pesticide residue content is unqualified when any group of data in the three groups of data detects that the pesticide residue content exceeds the standard;
the detection device used in the S1 comprises a cylinder body (2) positioned at the top of a bottom plate (1), a connecting mechanism and a sealing mechanism; the connecting mechanism comprises a vertical rod (3) and a top cover (6), the top of the bottom plate (1) is fixedly connected with the vertical rod (3), the top end of the vertical rod (3) is rotatably connected with the rotating shaft (4), the rotating shaft (4) is fixedly connected with the outer wall of the barrel (2), the outer surface of the barrel (2) is fixedly connected with the extending block (5), the top of the barrel (2) is sleeved with the top cover (6), the top cover (6) is provided with a clamping groove (7), the middle of the ejector rod is in penetrating connection with the screw rod (8), two ends of the screw rod (8) are respectively fixedly connected with the handle (9) and the pressing plate (10), and the edge of the pressing plate (10) is fixedly connected with the sealing ring (11); sealing mechanism includes closing plate (15) and mounting panel (16), storage tank (12) have been seted up to bottom plate (1) top surface, bottom plate (1) top surface one side is rotated with closing plate (15) and is connected, and closing plate (15) inner wall and mounting panel (16) fixed connection, inside and filter screen (17) fixed connection of mounting panel (16), inside water conservancy diversion hole (18) have been seted up to bottom plate (1) side, and water conservancy diversion hole (18) side and end cover (19) threaded connection.
2. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the bottom end of the cylinder body (2) is provided with a notch, and the bottom end of the cylinder body (2) is positioned inside a storage groove (12) formed in the top surface of the bottom plate (1).
3. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: a storage tank (12) used for sample liquid detection is arranged on the top surface of the bottom plate (1), the storage tank (12) is fixedly connected with the detector (13), and one side of the top surface of the bottom plate (1) is fixedly connected with the display screen (14).
4. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the top surface of the bottom plate (1) is fixedly connected with the fixing plate (20), the top of the fixing plate (20) is fixedly connected with the soft water pipe (21), and the end part of the water pipe (21) is fixedly connected with the spray head (22).
5. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the cross-section of the top cover (6) is of a U-shaped structure, two clamping grooves (7) which are of an L-shaped structure are formed in the bottom end of the top cover (6), and the two clamping grooves (7) are connected with the extension block (5) in a clamped mode.
6. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the screw rod (8) is in threaded connection with the middle of the top cover (6), and the circular pressing plate (10) at the bottom end of the screw rod (8) is in sliding connection with the inside of the circular cylinder (2).
7. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the sealing ring (11) is of a circular ring-shaped structure, the maximum diameter of the circle of the sealing ring (11) is larger than the diameter of the pressing plate (10), and the sealing ring (11) is connected with the inner wall of the cylinder body (2) in a sealing and sliding mode.
8. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the groove that is used for mounting panel (16) to remove is offered at storage tank (12) middle part, mounting panel (16) are square hollow structure, just mounting panel (16) are connected with storage tank (12) bottom surface and side laminating.
9. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the end part of the sealing plate (15) is provided with a semicircular opening, the end part of the sealing plate (15) is attached to the outer wall of the cylinder body (2), and the bottom end of the cylinder body (2) is in contact with the inner wall of the storage groove (12) with one side in a semicircular structure.
10. The method for detecting the residual pesticide in the fruits and vegetables according to claim 1, which is characterized by comprising the following steps of: the end cover (19) is sleeved with an extension pipe on the side wall of the bottom plate (1), the extension pipe is communicated with the flow guide hole (18), and the flow guide pipe is communicated with the inside of the storage tank (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010683036.XA CN111679044A (en) | 2020-07-15 | 2020-07-15 | Method for detecting residual pesticide in fruits and vegetables |
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| CN202010683036.XA CN111679044A (en) | 2020-07-15 | 2020-07-15 | Method for detecting residual pesticide in fruits and vegetables |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730711A (en) * | 2021-02-23 | 2021-04-30 | 合肥工业大学 | Quick pesticide detection device based on chromatographic detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730711A (en) * | 2021-02-23 | 2021-04-30 | 合肥工业大学 | Quick pesticide detection device based on chromatographic detection method |
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