Pretreatment device for detecting pesticide residue sample

Abstract

The utility model provides a sample pretreatment device for detecting pesticide residues. The sample pretreatment device comprises a crushing tank, a transition measuring tube and a sample extraction tube group, the sample extraction tube group comprises a plurality of extraction tubes and an extraction tube base, the structures of the extraction tubes are completely the same, the discharge spout is communicated with the pipelines of the extraction tubes, the bottoms of the extraction tubes are fixedly or movably connected with the extraction tube base, and the bottoms of the extraction tubes are provided with filter screens along the bottom walls of the extraction tubes; a pluggable sealing cover is further arranged in the middle of each extraction tube to seal and divide the extraction tube into an extraction part and a filtering part, and a contraction part is arranged below the filter screen to form a contraction opening; the extraction tube base is connected with a vortex shaft; and the vortex shaft is driven by a vortex pump. According to the pretreatment device for detecting the pesticide residue samples, the errors of the to-be-detected samples and the standard quantity samples in operation are reduced by reducing the differences and the errors of the operation of the samples, so that the accuracy of a subsequent detection method is improved.

Description

Technical Field

[0001] The utility model relates to the field of environmental detection devices, in particular to a sample pre-treatment device for detecting pesticide residues. Background Art

[0002] Pesticide residues are a general term for trace amounts of pesticide precursors, toxic metabolites, degradation products and impurities that remain in organisms, harvests, soil, water and the atmosphere after a certain period of time after pesticide use. Conventional pesticide residue analysis methods require residue extraction before testing.

[0003] There are many inventions related to agricultural product pesticide residue extraction devices for pesticide residue detection in the prior art, but none of them can overcome their common drawbacks. For example, a pesticide residue extraction device for agricultural product pesticide residue detection disclosed in Chinese Patent Publication No. CN212621816U has a fast extraction speed and improves work efficiency, but the device structure is complex, and because the pesticide residue detection involves the detection of parallel samples, and the quantification of pesticide residues needs to be referenced to a standard product, when the sample is spiked as the standard quantitative curve, the slight difference in the operation between the spiked sample and the sample to be tested may lead to inaccurate quantification, and the slight difference in the operation between the parallel samples will also lead to an increase in the variance between the parallel samples, thereby reducing the accuracy of the detection method. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a sample pre-treatment device for detecting pesticide residues.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a sample pretreatment device for detecting pesticide residues, the sample pretreatment device comprising a crushing tank, a transition volume tube, and a sample extraction tube group;

[0006] A spiral cutter is arranged in the crushing tank, and the spiral cutter is driven by a motor. A material outlet is arranged at the bottom of the crushing tank and is connected to the transition measuring tube pipeline. A first valve is arranged on the pipeline between the crushing tank and the transition measuring tube. A nozzle is arranged at the bottom of the transition measuring tube, and the nozzle is located above the sample extraction tube group. The nozzle is provided with a second valve.

[0007] The sample extraction tube group includes a plurality of extraction tubes and extraction tube bases, each of which has the same structure, and each of which is centrally symmetrically distributed along the center of the extraction tube base. An opening and a matching cover are provided at the top of each extraction tube, and the nozzle is connected to the pipeline of each extraction tube. The bottom of each extraction tube is fixedly connected or movably connected to the extraction tube base, and a filter screen is provided along the bottom wall of the extraction tube at the bottom of each extraction tube. A plug-in sealing cover is also provided in the middle of each extraction tube to seal and separate the extraction tube into an extraction part and a filtering part, and a contraction part is provided below the filter screen to form a contraction opening;

[0008] The extraction tube base is connected to a vortex shaft, and the vortex shaft is driven by a vortex pump.

[0009] The above-mentioned sample pretreatment device for detecting pesticide residues adds sufficient amounts of the sample to be tested, the sample for adding a spike to the sample to be tested, and the extraction reagent in a proportion in the crushing tank, and the parallel sample to be tested and the sample for adding a spike to establish a standard curve are crushed synchronously, and then a fixed amount of the mixed extractant and sample is obtained through a transition volume tube, and then they are respectively transported to each extraction tube of the sample extraction tube group, and the opening and closing of the first valve and the second valve are controlled to transport equal amounts of the mixed extractant and sample to each extraction tube of the sample extraction tube group, and then the sample for adding a spike to the sample to be tested has not yet been added, and the samples in each extraction tube are the same, and the processes of the front processing are all synchronous and consistent. The method reduces the slight differences in the operation between the spiked sample and the sample to be tested, the slight differences in the operation between the parallel samples, and the operational errors between samples. After the sample for spiked sample to be tested is added to the quantitative standard, each extraction tube is centrally symmetrically distributed along the center of the extraction tube base. The extraction tube base is connected to the vortex shaft, and the vortex shaft is driven by a vortex pump, so that the disturbances to each sample during the extraction process tend to be consistent. After the extraction is completed, the plug-in sealing cover provided in the middle of each extraction tube is opened, and after the mixed liquid is filtered through the filter screen, the filtrate is collected in the test tube through the contraction port formed by the contraction portion provided below the filter screen, and the sample is loaded on the machine after further processing. The above-mentioned pretreatment device for detecting pesticide residue samples reduces the errors between the operations of each sample to be tested and the standard sample by reducing the differences and errors between the operations of each sample, thereby improving the accuracy of the subsequent detection method.

[0010] Preferably, the sample extraction tube set comprises 3 to 20 extraction tubes.

[0011] Preferably, the sample extraction tube set comprises 5 to 12 extraction tubes.

[0012] The above-mentioned sample pretreatment device for detecting pesticide residues can simultaneously process multiple samples to be tested and spiked samples, reduce the differences and errors between operations of each sample, and thus reduce the errors between operations of each sample to be tested and standard sample, thereby improving the accuracy of subsequent detection methods.

[0013] Preferably, the bottom of each extraction tube is connected to the extraction tube base via a telescopic spring, and a limit ring or limit frame is provided on the outside of each extraction tube, and the inner diameter of the limit ring or limit frame is 1.2 to 2.5 times the outer diameter of the extraction tube.

[0014] The above-mentioned pretreatment device for detecting pesticide residue samples is connected to the vortex shaft through the extraction tube base, and the vortex shaft is driven by a vortex pump, so that the disturbances to each sample during the extraction process tend to be consistent, and the bottom of each extraction tube is connected to the extraction tube base through a telescopic spring. Under the premise of keeping the operating error between samples in the pretreatment process small, the disturbance in the extraction process is improved, and the extraction effect is improved.

[0015] Preferably, the filter screen at the bottom of each extraction tube is hingedly connected to the extraction tube.

[0016] The filter screen at the bottom of each extraction tube of the above-mentioned sample pretreatment device for detecting pesticide residues is hingedly connected to the extraction tube, and the filter screen can be rotated downward and folded open to discharge the extraction residue.

[0017] Preferably, the sample pretreatment device further comprises a movable liquid spray gun head arranged near the bottom of the sample extraction tube group, the liquid spray gun head connecting pipeline is connected to a water pump, and a waste liquid tank is arranged below the extraction tube group.

[0018] After the extraction residue is discharged, the above-mentioned pesticide residue detection sample pretreatment device sprays water through the liquid spray gun head for flushing.

[0019] Preferably, the water pump is a peristaltic pump.

[0020] Preferably, the sample pre-processing device further comprises a frame, and the crushing tank, transition volume tube, and sample extraction tube group are fixed on the frame.

[0021] The frame of the sample pretreatment device for detecting pesticide residues is used to fix and place various components of the sample pretreatment device for detecting pesticide residues.

[0022] Preferably, a feed port is provided on one side of the top of the crushing tank, the bottom of the crushing tank is located higher than the upper end of the transition tube, or a pressure pump is provided on the pipeline between the crushing tank and the transition tube.

[0023] The above-mentioned sample pre-treatment device for detecting pesticide residues can transport the material from the crushing tank to the transition tube by natural gravity, or by a pressure pump.

[0024] Preferably, a third valve is respectively provided on the branch pipeline between the transition measuring pipe and each extraction pipe.

[0025] Preferably, the transition metering tube is laterally provided with an overflow hole and a hole plug for closing the overflow hole.

[0026] The above-mentioned pesticide residue sample pretreatment device is provided with an overflow hole on the side of the transition volume tube. When the hole plug on the overflow hole is opened, the liquid exceeding the overflow hole flows out, and the liquid amount can be adjusted so that the volume and mass of the material liquid entering the sample extraction tube group remain equal.

[0027] Preferably, overflow holes are arranged laterally on the transition metering tube and are vertically and equidistantly arranged along the side wall of the transition metering tube.

[0028] The above-mentioned sample pretreatment device for detecting pesticide residues is provided with overflow holes laterally through the transition volume tube, and the overflow holes are vertically and equidistantly arranged, which can be suitable for testing multiple samples of different equal volumes.

[0029] The beneficial effects of the utility model are as follows: the utility model provides a sample pretreatment device for detecting pesticide residues. The sample pretreatment device for detecting pesticide residues of the utility model adds sufficient amounts of samples to be tested, samples for adding standard marks to the samples to be tested, and extraction reagents in proportion to a crushing tank, and synchronously crushes the parallel samples to be tested and the samples for adding standard marks to establish a standard curve, and then obtains a fixed amount of mixed extractant and sample through a transition volume tube, and respectively delivers them to each extraction tube of a sample extraction tube group, and controls the opening and closing of a first valve and a second valve to deliver equal amounts of mixed extractant and sample to each extraction tube of the sample extraction tube group, and then the samples for adding standard marks to the samples to be tested have not yet been added, and the contents of each extraction tube are The samples are all the same, and the processes of the front processing are all synchronized and the same, which reduces the slight differences in the operation between the spiked samples and the samples to be tested, the slight differences in the operation between the parallel samples, and the operational errors between the samples. After the sample used to spike the sample to be tested is added to the quantitative standard, each extraction tube is centrally symmetrically distributed along the center of the extraction tube base, and the extraction tube base is connected to the vortex shaft, which is driven by a vortex pump, so that the disturbances to each sample during the extraction process tend to be consistent. After the extraction is completed, the plug-in sealing cover provided in the middle of each extraction tube is opened, and after the mixed liquid is filtered through the filter screen, the filtrate is collected in the test tube through the contraction port formed by the contraction portion provided below the filter screen, and the sample is loaded on the machine after further processing. The above-mentioned pretreatment device for detecting pesticide residue samples reduces the errors between the operations of each sample to be tested and the standard sample by reducing the differences and errors between the operations of each sample, thereby improving the accuracy of the subsequent detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a schematic structural diagram of a sample pretreatment device for detecting pesticide residues according to an embodiment of the present invention.

[0031] Figure 2 This is a cross-sectional top view of a sample extraction tube set of a sample pretreatment device for detecting pesticide residues according to an embodiment of the utility model.

[0032] Figure 3 The present invention is a schematic structural diagram of a transition measuring tube of a sample pretreatment device for detecting pesticide residues according to an embodiment of the present invention.

[0033] Among them, 1. a crushing tank, 2. a transition measuring tube, 3. a sample extraction tube group, 4. a spiral cutter, 5. a motor, 6. a material outlet of the crushing tank, 7. a first valve, 8. a nozzle, 9. a second valve, 10. several extraction tubes, 11. an extraction tube base, 12. a pluggable sealing cover, 13. a limit ring or a limit frame, 14. a telescopic spring, 15. a vortex shaft, 16. a vortex pump, 17. a filter screen, 18. an overflow hole and a hole plug for closing the overflow hole. DETAILED DESCRIPTION

[0034] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. Example

[0035] As a sample pretreatment device for detecting pesticide residues in an embodiment of the present utility model, Figure 1 , Figure 2 , Figure 3 As shown, the sample pre-treatment device comprises a crushing tank (1), a transition volume tube (2), and a sample extraction tube set (3);

[0036] A spiral blade (4) is arranged in the crushing tank (1), and the spiral blade (4) is driven by a motor (5). A material outlet (6) is arranged at the bottom of the crushing tank (1) and is connected to the transition measuring tube (2). A first valve (7) is arranged on the pipeline between the crushing tank (1) and the transition measuring tube (2). A nozzle (8) is arranged at the bottom of the transition measuring tube (2), and the nozzle (8) is located above the sample extraction tube group (3). The nozzle (8) is provided with a second valve (9).

[0037] The sample extraction tube group (3) comprises a plurality of extraction tubes (10) and an extraction tube base (11), the structures of the extraction tubes (10) are completely the same, the extraction tubes (10) are centrally symmetrically distributed along the center of the extraction tube base (11), the upper part of each extraction tube (10) is provided with an opening and a matching cover body, the nozzle (8) is connected to the pipeline of each extraction tube (10), the bottom of each extraction tube (10) is fixedly connected or movably connected to the extraction tube base (11), the bottom of each extraction tube (10) is provided with a filter screen (17) along the bottom wall of the extraction tube, and the middle part of each extraction tube (10) is also provided with a plug-in sealing cover (12) to seal and separate the extraction tube into an extraction part and a filtering part, and a contraction part is provided below the filter screen (17) to form a contraction opening;

[0038] The extraction tube base (11) is connected to the vortex shaft (15), and the vortex shaft (15) is driven by a vortex pump (16).

[0039] The present embodiment of the utility model is a sample pretreatment device for detecting pesticide residues. A sufficient amount of the sample to be tested, the sample for adding a spike to the sample to be tested, and the extraction reagent are added in a crushing tank in proportion. The parallel sample to be tested and the sample for adding a spike to establish a standard curve are crushed synchronously. Then, a fixed amount of the mixed extractant and the sample are obtained through a transition tube and transported to each extraction tube of the sample extraction tube group respectively. By controlling the opening and closing of the first valve and the second valve, an equal amount of the mixed extractant and the sample can be transported to each extraction tube of the sample extraction tube group. Then, the sample for adding a spike to the sample to be tested has not yet been added. The samples in each extraction tube are the same, and the front processing process is the same. The steps are the same, which reduces the slight differences in the operation between the spiked sample and the sample to be tested, the slight differences in the operation between the parallel samples, and the operational errors between samples. After the sample used for spiked sample to be tested is added to the quantitative standard, each extraction tube is centrally symmetrically distributed along the center of the extraction tube base, and the extraction tube base is connected to the vortex shaft, which is driven by a vortex pump, so that the disturbances to each sample during the extraction process tend to be consistent. After the extraction is completed, the plug-in sealing cover provided in the middle of each extraction tube is opened, and after the mixed liquid is filtered through the filter screen, the filtrate is collected in the test tube through the contraction port formed by the contraction portion provided below the filter screen, and the sample is loaded on the machine after further processing. The above-mentioned pretreatment device for detecting pesticide residue samples reduces the errors between the operations of each sample to be tested and the standard sample by reducing the differences and errors between the operations of each sample, thereby improving the accuracy of the subsequent detection method.

[0040] Furthermore, the number of extraction tubes (10) included in the sample extraction tube set (3) is 3 to 20.

[0041] Furthermore, the number of extraction tubes (10) included in the sample extraction tube set (3) is 5 to 12.

[0042] The sample pretreatment device for detecting pesticide residues of the utility model in this embodiment can simultaneously process multiple samples to be tested and spiked samples, reduce the differences and errors between the operations of each sample, and thus reduce the errors between the operations of each sample to be tested and the standard sample, thereby improving the accuracy of subsequent detection methods.

[0043] Furthermore, the bottom of each extraction tube (10) is connected to the extraction tube base (11) via a telescopic spring (14), and a limit ring or a limit frame (13) is provided on the outside of each extraction tube (10), and the inner diameter of the limit ring or the limit frame (13) is 1.2 to 2.5 times the outer diameter of the extraction tube (10).

[0044] The utility model in this embodiment is a sample pretreatment device for detecting pesticide residues, which is connected to a vortex shaft via an extraction tube base. The vortex shaft is driven by a vortex pump, so that the disturbances to which each sample is subjected during the extraction process tend to be consistent. In addition, the bottom of each extraction tube is connected to the extraction tube base via a telescopic spring. Under the premise of keeping the operational error between samples during the pretreatment process small, the disturbance during the extraction process is reduced, thereby improving the extraction effect.

[0045] Furthermore, the filter screen (17) at the bottom of each extraction tube (10) is connected to the extraction tube (10) in an articulated opening and closing manner.

[0046] The filter screen at the bottom of each extraction tube of the sample pretreatment device for detecting pesticide residues in the utility model of this embodiment is hingedly connected to the extraction tube, and the filter screen can be rotated downward and folded open to discharge the extraction residue.

[0047] Furthermore, the sample pretreatment device also includes a movable liquid spray gun head arranged near the bottom of the sample extraction tube group, the liquid spray gun head connecting pipeline is connected to the water pump, and a waste liquid tank is arranged below the extraction tube group.

[0048] The sample pretreatment device for detecting pesticide residues in the utility model of the present embodiment is rinsed by spraying water through the liquid spray gun head after the extraction residue is discharged.

[0049] Furthermore, the water pump is a peristaltic pump.

[0050] Furthermore, the sample pre-treatment device also comprises a frame, and the crushing tank (1), the transition volume tube (2), and the sample extraction tube group (3) are fixed on the frame.

[0051] The frame of the sample pretreatment device for detecting pesticide residues of the utility model in this embodiment is used to fix and place various components of the sample pretreatment device for detecting pesticide residues.

[0052] Furthermore, a feed port is provided on one side of the top of the crushing tank (1), the bottom of the crushing tank (1) is located higher than the upper end of the transition tube (2), or a pressure pump is provided on the pipeline between the crushing tank (1) and the transition tube (2).

[0053] The sample pretreatment device for detecting pesticide residues in the utility model of the present embodiment can transport the material from the crushing tank to the transition tube by natural gravity, or by a pressure pump.

[0054] In a further step, a third valve is respectively provided on the branch pipelines between the transition measuring pipe (2) and each extraction pipe (10).

[0055] Furthermore, an overflow hole and a hole plug (18) for closing the overflow hole are arranged laterally on the transition measuring tube (2).

[0056] The sample pretreatment device for detecting pesticide residues in the utility model of this embodiment is provided with an overflow hole on the side of the transition volume tube. The hole plug on the overflow hole is opened, and the liquid exceeding the overflow hole flows out. The liquid amount can be adjusted so that the volume and mass of the material liquid entering the sample extraction tube group remain equal.

[0057] Furthermore, overflow holes are arranged laterally on the transition metering tube (2) and are arranged vertically and equidistantly along the side wall of the transition metering tube.

[0058] The sample pretreatment device for detecting pesticide residues in the utility model of the present embodiment is provided with overflow holes laterally through the transition volume tube. The overflow holes are vertically and equidistantly arranged, and can be applied to the testing of multiple samples of different equal volumes.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A sample pretreatment device for detecting pesticide residues, characterized in that: The sample pre-treatment device comprises a crushing tank, a transition volume tube, and a sample extraction tube group; A spiral cutter is arranged in the crushing tank, and the spiral cutter is driven by a motor. A material outlet is arranged at the bottom of the crushing tank and is connected to the transition measuring tube pipeline. A first valve is arranged on the pipeline between the crushing tank and the transition measuring tube. A nozzle is arranged at the bottom of the transition measuring tube, and the nozzle is located above the sample extraction tube group. The nozzle is provided with a second valve. The sample extraction tube group includes a plurality of extraction tubes and extraction tube bases, each of which has the same structure, and each of which is centrally symmetrically distributed along the center of the extraction tube base. An opening and a matching cover are provided at the top of each extraction tube, and the nozzle is connected to the pipeline of each extraction tube. The bottom of each extraction tube is fixedly connected or movably connected to the extraction tube base, and a filter screen is provided along the bottom wall of the extraction tube at the bottom of each extraction tube. A plug-in sealing cover is also provided in the middle of each extraction tube to seal and separate the extraction tube into an extraction part and a filtering part, and a contraction part is provided below the filter screen to form a contraction opening; The extraction tube base is connected to a vortex shaft, and the vortex shaft is driven by a vortex pump.

2. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: The number of extraction tubes included in the sample extraction tube set is 3 to 20.

3. The sample pretreatment device for detecting pesticide residues according to claim 2, characterized in that: The number of extraction tubes included in the sample extraction tube set is 5 to 12.

4. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: The bottom of each extraction tube is connected to the extraction tube base through a telescopic spring, and a limiting ring or a limiting frame is arranged on the outside of each extraction tube. The inner diameter of the limiting ring or the limiting frame is 1.2 to 2.5 times the outer diameter of the extraction tube.

5. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: The filter screen at the bottom of each extraction tube is connected to the extraction tube in an articulated opening and closing manner.

6. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: The sample pretreatment device also includes a movable liquid spray gun head arranged near the bottom of the sample extraction tube group. The liquid spray gun head connecting pipeline is connected to a water pump. A waste liquid tank is arranged below the extraction tube group, and the water pump is a peristaltic pump.

7. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: The sample pre-processing device also includes a frame, and the crushing tank, transition volume tube, and sample extraction tube group are fixed on the frame.

8. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: A feed port is provided on one side of the top of the crushing tank, the bottom of the crushing tank is located higher than the upper end of the transition tube, or a pressure pump is provided on the pipeline between the crushing tank and the transition tube, and a third valve is provided on the branch pipeline between the transition tube and each extraction pipe.

9. The sample pretreatment device for detecting pesticide residues according to claim 1, characterized in that: The transition metering pipe is laterally provided with an overflow hole and a hole plug for closing the overflow hole.

10. The sample pretreatment device for detecting pesticide residues according to claim 9, characterized in that: The transition metering tube is laterally provided with overflow holes which are vertically and equidistantly arranged along the side wall of the transition metering tube.

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