CN209416801U - Residue of veterinary drug matrix standard sample Preparation equipment - Google Patents
Residue of veterinary drug matrix standard sample Preparation equipment Download PDFInfo
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- CN209416801U CN209416801U CN201822190982.1U CN201822190982U CN209416801U CN 209416801 U CN209416801 U CN 209416801U CN 201822190982 U CN201822190982 U CN 201822190982U CN 209416801 U CN209416801 U CN 209416801U
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- residue
- standard sample
- veterinary drug
- drug matrix
- matrix standard
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Abstract
The residue of veterinary drug matrix standard sample Preparation equipment of the utility model passes through setting pedestal, determination of moisture mechanism, crushing and screening mechanism and cooling humidification mechanism.Residue of veterinary drug matrix standard sample is crushed using grinding device, pulverized residue of veterinary drug matrix standard sample is placed in vibration screening disk, utilize the different screen holes in aperture, pulverized residue of veterinary drug matrix standard sample is screened out to come, carry out the biggish residue of veterinary drug matrix standard sample of particle for screening out, crushing and screening is carried out again, until meeting testing conditions；Carry out the moderate residue of veterinary drug matrix standard sample of particle for screening out, seal up for safekeeping be made sample carried out card standard sample validation test；Carry out the lesser residue of veterinary drug matrix standard sample of particle for screening out, is sent into humidifier, the vapor sprayed using atomizer, surface is humidified, is cooled and solidified, is then reheated, after constant moisture being sent into cooling device, it crushes and screens, until meeting uniformity testing conditions.
Description
Technical field
The utility model relates to veterinary drug sample making technology fields, prepare more particularly to a kind of residue of veterinary drug matrix standard sample
Equipment.
Background technique
Currently, livestock and poultry body or product (such as egg, milk products, meat) are accumulated or retained in residue of veterinary drug after referring to medication
Mesarcs drug or its metabolite, the residual including impurity related with veterinary drug.Generally with μ g/mL or μ g/g metering.With
Transformation of the people to animal-derived food from demand type to mass type, the residue of veterinary drug in animal-derived food have been increasingly becoming the whole world
One focus of concern.Food additives and the pollutant combined Committee of Experts since the 1960s evaluate related beast
The remaining toxicity of medicine recognizes the harm of residue of veterinary drug for people and its control provides scientific basis.In conjunction with research both domestic and external
Data, article are illustrated for type, the way of production, left drug and its harm of residue of veterinary drug.Veterinary drug is in prevention and treatment animal
Disease, raising production efficiency, improvement Animal product quality etc. play a very important role.However, due to poultry feeders pair
The shortage of scientific knowledge and economic interests are pursued simply, cause to abuse veterinary drug phenomenon generally existing in current animal husbandry.
Abuse veterinary drug easily causes the residual of harmful substance in animal-derived food, this not only causes directly to endanger to human health, but also
High risks are also resulted in the development and ecological environment of animal husbandry.
With the continuous improvement of the food-safe consciousness of people, using residue of veterinary drug control as the agricultural product hygienic quality of core
Safety requirements is also increasingly stringenter.Control agricultural product veterinary drug residue amount key link first is that persticide residue and
When, accurate analysis detection.To detection of veterinary drugs in food require it is quick, sensitive while, testing result should also have accuracy,
Reliability and comparativity.In terms of establishing measurement result traceability, substrate standard substance plays a significant role.Substrate standard substance
Use be the effective ways controlled comprehensively from sample to result analysis system.More and more Experiment of Analytical Chemistry rooms
Carry out quality system control and proficiency testing using substrate standard substance, the uniformity of such residue of veterinary drug matrix standard sample and
Stability just seems most important.The preparation of existing residue of veterinary drug matrix standard sample is all using pulper that veterinary drug is residual
Matrix standard sample is stayed crush directly being detected, the above process not can guarantee the crushing of residue of veterinary drug matrix standard sample
The uniformity of the residue of veterinary drug matrix standard sample for being uniformly distributed, that is, being crushed of uniformity and granularity is not high, pulverized
The granularity size of residue of veterinary drug matrix standard sample, which is unable to get, accurately to be controlled, and then has influenced detection of veterinary drugs in food matter
Measure the precision and accuracy of process control.
Utility model content
The purpose of the utility model is to overcome shortcoming in the prior art, provide one kind can to granularity size into
Row control, guarantee the residue of veterinary drug matrix standard sample Preparation equipment of the sample uniformity.
The purpose of this utility model is achieved through the following technical solutions:
A kind of residue of veterinary drug matrix standard sample Preparation equipment, comprising:
Pedestal；
Determination of moisture mechanism, the determination of moisture mechanism include electronic scale and drying unit, and the electronic scale is set to institute
It states on pedestal, the drying unit includes drying cabinet, heat generating component, case lid and handle, and the drying cabinet is set to described
On pedestal, the heat generating component is set in the drying box body, and the case lid and the drying cabinet are hinged, and the handle is set
It is placed on the case lid；
Crushing and screening mechanism, the crushing and screening mechanism include workbench, grinding device, clamping device and screening plant,
The workbench is set on the pedestal, the grinding device include lifting platform, riser guide, lifting motor, lifting slider,
Blender and crushing barred body, the lifting platform are set on the workbench, and the riser guide is set on the lifting platform,
The lifting motor is set on the lifting platform, and the lifting slider is slideably positioned on the riser guide, and described
The driving axis connection of lifting slider and the lifting motor, the blender are set on the lifting slider, the crushing stick
The rotation axis connection of body and the blender, the outer wall for crushing barred body are provided with crushing blade, and the clamping device includes
Clamping driver, the first clamping jaw and the second clamping jaw, the clamping driver are set on the pedestal, first clamping jaw and institute
Driving axis connection of second clamping jaw respectively with the clamping driver is stated, the screening plant includes vibrating motor, vibration screening
Disk and multiple sample storage tanks, the vibrating motor and the vibration screening disk are respectively arranged on the pedestal, the vibration
Screening plate is connect with the vibrating motor, and multiple screen holes are offered on the vibration screening disk, and the hole of the screen holes is directly gone to
Direction far from the vibrating motor is sequentially reduced, and each sample storage tank is set on the pedestal, and each sample
Storage tank is respectively positioned on the underface of each screen holes；
Cooling humidification mechanism, the cooling humidification mechanism includes humidifier and cooling device, and the humidifier includes
Humidifier body and atomizer, the humidifier body are set on the pedestal, and limit is offered in the humidifier body
Slot, the atomizer are connect with the output end of the humidifier body, the cooling device include cooling box, cooling component and
Slip lid, the cooling box are set on the pedestal, and multiple accommodation grooves, institute are offered at the medium position of the cooling box
It states cooling component to be set in the cooling box, the slip lid is slideably positioned on the cooling box.
In a wherein embodiment, the drying unit further includes insulating layer, and the insulating layer is set to the case
It covers.
In a wherein embodiment, multiple skid resistance strips, each adjacent two skid resistance strip are provided on the handle
Between be provided with interval.
In a wherein embodiment, the crushing and screening mechanism further includes traverse displacement unit, and the traverse displacement unit includes
Traversing driving assembly, traversing guide rail and traversing sliding shoe, the traversing driving assembly are set on the pedestal, described traversing to lead
Rail is set on the pedestal, and the traversing sliding shoe is slideably positioned on the traversing guide rail, and the traversing sliding shoe with
The driving axis connection of the traversing driving assembly, the clamping driver are set on the traversing sliding shoe.
In a wherein embodiment, the traversing driving assembly is motor.
In a wherein embodiment, it is provided with the first bolster on first clamping jaw, is set on second clamping jaw
It is equipped with the second bolster.
In a wherein embodiment, first bolster is the first rubber bumper, and second clamping jaw is the
Two rubber bumpers.
In a wherein embodiment, the blender is motor.
In a wherein embodiment, gripping protrusion is provided on the slip lid, the gripping protrusion is located at the cunning
The middle position of lid.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The residue of veterinary drug matrix standard sample Preparation equipment of the utility model, by the way that pedestal, determination of moisture mechanism, powder is arranged
Broken sorting mechanism and cooling humidification mechanism.In actual application process, using grinding device by residue of veterinary drug matrix standard sample
Product are crushed, and pulverized residue of veterinary drug matrix standard sample is placed in vibration screening disk, the different sieve in aperture is utilized
Hole is selected, pulverized residue of veterinary drug matrix standard sample is screened out to come, carrys out the biggish residue of veterinary drug base of particle for screening out
Body standard sample carries out crushing and screening again, until meeting testing conditions；Carry out the moderate residue of veterinary drug base of particle for screening out
Body standard sample, seal up for safekeeping be made sample carried out card standard sample validation test；For screening out, to carry out the lesser veterinary drug of particle residual
Stay matrix standard sample, be sent into humidifier, the vapor sprayed using atomizer humidifies surface, be sent into cooling device into
Row cooling and solidifying, then reheats, after constant moisture, crushes and screens, until meeting uniformity testing conditions.It is above-mentioned can be right
Granularity size is controlled, and guarantees the sample uniformity, will not influence the subsequent technical identification for having card standard sample.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the structural representation of the residue of veterinary drug matrix standard sample Preparation equipment in an embodiment of the utility model
Figure；
Fig. 2 is enlarged diagram of the Fig. 1 at A.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Fig. 1 and Fig. 2 are please referred to, residue of veterinary drug matrix standard sample Preparation equipment 10 includes pedestal 100, determination of moisture mechanism
200, crushing and screening mechanism 300 and cooling humidification mechanism 400.
Referring to Fig. 1, determination of moisture mechanism 200 includes electronic scale 210 and drying unit 220, and electronic scale is set to
On pedestal 100, electronic scale 210 includes bearing platform 211, pressure sensing panel 212 and pressure sensing mould group, and bearing platform 211 is arranged
In on pedestal 100, pressure sensing mould group is set in bearing platform 211, the detection of pressure sensing panel 212 and pressure sensing mould group
End connection, drying unit 220 include drying cabinet 221, heat generating component, case lid 222 and handle 223, and drying cabinet 221 is arranged
In on pedestal 100, heat generating component is set in drying cabinet 221, and case lid 222 and drying cabinet 221 are hinged, and handle 223 is arranged
In on case lid 222；
It is thus desirable to explanation, the determination of moisture of determination of moisture mechanism 200, concrete operations are, by residue of veterinary drug matrix
Standard sample is placed on pressure sensing panel 212, and pressure sensing mould group measures the weight of residue of veterinary drug matrix standard sample, then
Residue of veterinary drug matrix standard sample is put into drying cabinet 221, residue of veterinary drug matrix standard sample is dried, drying one
After holding the time, residue of veterinary drug matrix standard sample is placed on the weight after pressure sensing panel 212 is dried again, is passed through
Weight difference twice obtains the moisture content numerical value of residue of veterinary drug matrix standard sample.
Referring to Fig. 1 and Fig. 2, crushing and screening mechanism 300 includes workbench 310, grinding device 320, clamping device
330 and screening plant 340, workbench 310 be set on pedestal 100, grinding device 320 include lifting platform 321, riser guide,
Lifting motor 322, lifting slider 323, blender 324 and crushing barred body 325, lifting platform 321 are set on workbench 310, are risen
Drop guide rail is set on lifting platform 321, and lifting motor 322 is set on lifting platform 321, and lifting slider 323 is slideably positioned in liter
It drops on guide rail, and the driving axis connection of lifting slider 323 and lifting motor 322, blender 324 are set to lifting slider 323
On, the rotation axis connection of barred body 325 and blender 324 is crushed, the outer wall for crushing barred body 325 is provided with crushing blade, clamping dress
Setting 330 includes clamping driver 331, the first clamping jaw 332 and the second clamping jaw 333, and clamping driver 331 is set on pedestal 100,
The driving axis connection with clamping driver 331, screening plant 340 include vibration horse respectively for first clamping jaw 332 and the second clamping jaw 333
Up to 341, vibration screening disk 342 and multiple sample storage tanks, vibrating motor 341 and vibration screening disk 342 are respectively arranged at pedestal
On 100, vibration screening disk 342 is connect with vibrating motor 341, and multiple screen holes are offered on vibration screening disk 342, screen holes
Hole is directly gone to the direction far from vibrating motor 341 and is sequentially reduced, and each sample storage tank is set on pedestal 100, and each sample stores
Tank is respectively positioned on the underface of each screen holes；
Referring to Fig. 1 and Fig. 2, cooling humidification mechanism 400 includes humidifier 410 and cooling device 420, humidification
Device 410 includes humidifier body 411 and atomizer, and humidifier body 411 is set on pedestal 100, humidifier body 411
On offer limiting slot, the output end of atomizer and humidifier body connects, and cooling device 420 includes cooling box 421, cooling
Component and slip lid 422, cooling box 421 are set on pedestal 100, and multiple appearances are offered at the medium position of cooling box 421
Slot is set, cooling component is set in cooling box, and slip lid 422 is slideably positioned on cooling box 421；
It is thus desirable to explanation, is crushed residue of veterinary drug matrix standard sample using grinding device 320, it will be by
The residue of veterinary drug matrix standard sample of crushing is placed in vibration screening disk 342, using the different screen holes in aperture, will be crushed
Residue of veterinary drug matrix standard sample screen out come, carry out the biggish residue of veterinary drug matrix standard sample of particle for screening out, then
Secondary carry out crushing and screening, until meeting testing conditions；Carry out the moderate residue of veterinary drug matrix standard sample of particle for screening out, seals
Deposit be made sample carried out card standard sample validation test；Carry out the lesser residue of veterinary drug matrix standard sample of particle for screening out
Product are sent into humidifier 410, and the vapor sprayed using atomizer humidifies surface, are cooled down being sent into cooling device 420
Solidification after constant moisture, is then reheated, is crushed and screened, until meet uniformity testing conditions, it is above-mentioned can be to granularity
What size was controlled, guarantee the sample uniformity, will not influence the subsequent technical identification for having card standard sample.Further, exist
In one embodiment, drying unit 220 further includes insulating layer, and insulating layer is set on case lid 222；
It is thus desirable to explanation, insulating layer is used for thermal insulation, prevents user from directly contacting the scald of case lid 222.
Further, in one embodiment, multiple skid resistance strips, each adjacent two tread plate are provided on handle 223
Interval is provided between line；
It is thus desirable to which explanation, the setting of skid resistance strip can be improved the frictional force between handle 223 and hand, prevent
It skids.
Further, referring to Fig. 2, in one embodiment, crushing and screening mechanism 300 further includes traverse displacement unit
350, traverse displacement unit 350 includes traversing driving assembly 351, traversing guide rail 352 and traversing sliding shoe 353, traversing driving assembly
351 are set on pedestal 100, and traversing guide rail 352 is set on pedestal 100, and traversing sliding shoe 353 is slideably positioned in traversing guide rail
On 352, and the driving axis connection of traversing sliding shoe 353 and traversing driving assembly 351, clamping driver 331 are set to traversing cunning
On motion block 353；
It is thus desirable to explanation, traversing driving assembly 351 drives clamping for driving traversing sliding shoe 353 to slide
Device 331 is fast moved to the feeding end of vibration screening disk 342.
Specifically, in one embodiment, traversing driving assembly 351 is motor.
Further, in one embodiment, it is provided with the first bolster on the first clamping jaw 332, is set on the second clamping jaw 333
It is equipped with the second bolster；
It is thus desirable to which explanation, the first clamping jaw 332 and the second clamping jaw 333 are stored with residue of veterinary drug matrix for clamping
The container of standard sample.
Specifically, in one embodiment, the first bolster is the first rubber bumper, and the second clamping jaw is slow for the second rubber
Stamping.
Specifically, in one embodiment, blender 324 is motor.
Specifically, in one embodiment, it is provided with gripping protrusion on slip lid 422, holds protrusion and is located in slip lid 422
Between at position.
The residue of veterinary drug matrix standard sample Preparation equipment of the utility model, by the way that pedestal, determination of moisture mechanism, powder is arranged
Broken sorting mechanism and cooling humidification mechanism.In actual application process, using grinding device by residue of veterinary drug matrix standard sample
Product are crushed, and pulverized residue of veterinary drug matrix standard sample is placed in vibration screening disk, the different sieve in aperture is utilized
Hole is selected, pulverized residue of veterinary drug matrix standard sample is screened out to come, carrys out the biggish residue of veterinary drug base of particle for screening out
Body standard sample carries out crushing and screening again, until meeting testing conditions；Carry out the moderate residue of veterinary drug base of particle for screening out
Body standard sample, seal up for safekeeping be made sample carried out card standard sample validation test；For screening out, to carry out the lesser veterinary drug of particle residual
Stay matrix standard sample, be sent into humidifier, the vapor sprayed using atomizer humidifies surface, be sent into cooling device into
Row cooling and solidifying, then reheats, after constant moisture, crushes and screens, until meeting uniformity testing conditions.It is above-mentioned can be right
Granularity size is controlled, and guarantees the sample uniformity, will not influence the subsequent technical identification for having card standard sample.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (9)
1. a kind of residue of veterinary drug matrix standard sample Preparation equipment characterized by comprising
Pedestal；
Determination of moisture mechanism, the determination of moisture mechanism include electronic scale and drying unit, and the electronic scale is set to the base
On seat, the drying unit includes that drying cabinet, heat generating component, case lid and handle, the drying cabinet are set to the pedestal
On, the heat generating component is set in the drying box body, and the case lid and the drying cabinet are hinged, and the handle is set to
On the case lid；
Crushing and screening mechanism, the crushing and screening mechanism include workbench, grinding device, clamping device and screening plant, described
Workbench is set on the pedestal, and the grinding device includes lifting platform, riser guide, lifting motor, lifting slider, stirring
Device and crushing barred body, the lifting platform are set on the workbench, and the riser guide is set on the lifting platform, described
Lifting motor is set on the lifting platform, and the lifting slider is slideably positioned on the riser guide, and the lifting
The driving axis connection of sliding block and the lifting motor, the blender are set on the lifting slider, the crushing barred body with
The rotation axis connection of the blender, the outer wall for crushing barred body are provided with crushing blade, and the clamping device includes clamping
Driver, the first clamping jaw and the second clamping jaw, the clamping driver are set on the pedestal, first clamping jaw and described
Two clamping jaws respectively with it is described clamping driver driving axis connection, the screening plant include vibrating motor, vibration screening disk and
Multiple sample storage tanks, the vibrating motor and the vibration screening disk are respectively arranged on the pedestal, the vibration screening
Disk is connect with the vibrating motor, and multiple screen holes are offered on the vibration screening disk, and the hole of the screen holes is directly gone to separate
The direction of the vibrating motor is sequentially reduced, and each sample storage tank is set on the pedestal, and each sample storage
Tank is respectively positioned on the underface of each screen holes；
Cooling humidification mechanism, the cooling humidification mechanism include humidifier and cooling device, and the humidifier includes humidification
Device ontology and atomizer, the humidifier body are set on the pedestal, and limiting slot, institute are offered in the humidifier body
Atomizer to be stated to connect with the output end of the humidifier body, the cooling device includes cooling box, cooling component and slip lid,
The cooling box is set on the pedestal, and multiple accommodation grooves are offered at the medium position of the cooling box, described cold
But component is set in the cooling box, and the slip lid is slideably positioned on the cooling box.
2. residue of veterinary drug matrix standard sample Preparation equipment according to claim 1, which is characterized in that the drying unit
It further include insulating layer, the insulating layer is set on the case lid.
3. residue of veterinary drug matrix standard sample Preparation equipment according to claim 1, which is characterized in that set on the handle
Multiple skid resistance strips are equipped with, interval is provided between each adjacent two skid resistance strip.
4. residue of veterinary drug matrix standard sample Preparation equipment according to claim 1, which is characterized in that the crushing and screening
Mechanism further includes traverse displacement unit, and the traverse displacement unit includes traversing driving assembly, traversing guide rail and traversing sliding shoe, described traversing
Driving assembly is set on the pedestal, and the traversing guide rail is set on the pedestal, the traversing sliding shoe sliding setting
In on the traversing guide rail, and the driving axis connection of the traversing sliding shoe and the traversing driving assembly, the clamping driving
Device is set on the traversing sliding shoe.
5. residue of veterinary drug matrix standard sample Preparation equipment according to claim 4, which is characterized in that the traversing driving
Component is motor.
6. residue of veterinary drug matrix standard sample Preparation equipment according to claim 1, which is characterized in that first clamping jaw
On be provided with the first bolster, be provided with the second bolster on second clamping jaw.
7. residue of veterinary drug matrix standard sample Preparation equipment according to claim 6, which is characterized in that first buffering
Part is the first rubber bumper, and second clamping jaw is the second rubber bumper.
8. residue of veterinary drug matrix standard sample Preparation equipment according to claim 1, which is characterized in that the blender is
Motor.
9. residue of veterinary drug matrix standard sample Preparation equipment according to claim 1, which is characterized in that set on the slip lid
It is equipped with gripping protrusion, the middle position for holding protrusion and being located at the slip lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822190982.1U CN209416801U (en) | 2018-12-25 | 2018-12-25 | Residue of veterinary drug matrix standard sample Preparation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822190982.1U CN209416801U (en) | 2018-12-25 | 2018-12-25 | Residue of veterinary drug matrix standard sample Preparation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209416801U true CN209416801U (en) | 2019-09-20 |
Family
ID=67940395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822190982.1U Active CN209416801U (en) | 2018-12-25 | 2018-12-25 | Residue of veterinary drug matrix standard sample Preparation equipment |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112814A (en) * | 2021-11-24 | 2022-03-01 | 上海方予健康医药科技有限公司 | Method for testing cascade impactor level cut-off diameter and application |
| CN115436538A (en) * | 2022-09-17 | 2022-12-06 | 山东省计量科学研究院 | Device and method for preparing veterinary drug residue standard substance of meat food matrix |
-
2018
- 2018-12-25 CN CN201822190982.1U patent/CN209416801U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112814A (en) * | 2021-11-24 | 2022-03-01 | 上海方予健康医药科技有限公司 | Method for testing cascade impactor level cut-off diameter and application |
| CN115436538A (en) * | 2022-09-17 | 2022-12-06 | 山东省计量科学研究院 | Device and method for preparing veterinary drug residue standard substance of meat food matrix |
| CN115436538B (en) * | 2022-09-17 | 2023-08-01 | 山东省计量科学研究院 | Device and method for preparing veterinary drug residue standard substance of meat food matrix |
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