CN218865617U

CN218865617U - High-efficient QuEChERs purge tube

Info

Publication number: CN218865617U
Application number: CN202223078688.4U
Authority: CN
Inventors: 许艳秋; 王广成; 高立明; 李婷; 赵霞; 陈丙坤; 吴春先
Original assignee: Sichuan Institute Of Pesticide Control
Current assignee: Sichuan Institute Of Pesticide Control
Priority date: 2022-11-20
Filing date: 2022-11-20
Publication date: 2023-04-14
Anticipated expiration: 2032-11-20

Abstract

The utility model discloses a high-efficient QuEChERs purge tube, including the body, its characterized in that: the improved pipe is characterized in that a piston is arranged in the upper portion of the pipe body and connected with a piston rod, the upper end of the piston rod extends out of the pipe body, a liquid outlet is formed in the bottom surface of the pipe body, two layers (or one layer) of sieve plates are arranged at the bottom in the pipe body, a filter membrane is clamped between the two layers of sieve plates (or between the sieve plates and the bottom of the pipe), an adsorbent is arranged above the sieve plates, and a sealing plug is arranged at the liquid outlet. The utility model discloses a QuEChERs purge tube adopts the form of cylinder, and the sample takes off the piston of cylinder after the extraction, adds a certain amount of adsorbent earlier, adds the extract again, and manual shake adsorbs the back, directly presses down the piston and filters, need not centrifugation and transfer operation, and the purge tube simple structure, convenient operation.

Description

High-efficient QuEChERs purge tube

Technical Field

The utility model relates to a QuEChERs purge tube field, concretely relates to high-efficient QuEChERs purge tube.

Background

At present, methods for detecting pesticide residues in fruits, vegetables, meats, grains, oil and nuts mainly comprise methods of solid-phase extraction, liquid-liquid extraction, quEChERS and the like, wherein the method of solid-phase extraction has been used for many years, the QuEChERS method is popularized in China in recent years, but the QuEChERS products in the market are mainly in centrifugal tube forms and have a series of specifications of 2ml,5ml,10ml,15ml, 50ml and the like, and the traditional QuEChERS method mainly comprises the following operation processes: (1) crushing a sample; (2) extracting and separating acetonitrile which is a single solvent; (3) Adding MgSO ₄ Removing water from salts; (4) Adding adsorbents such as ethylenediamine-N-Propyl Silane (PSA) and the like, and removing impurities by shaking with hands; (5) Centrifuging, filtering the supernatant, and detecting by GC-MS and LC-MS.

And placing the adsorbent in a QuEChERS purification tube, centrifuging after adsorption is finished, then transferring supernatant, filtering by a filter membrane, and then carrying out sample injection analysis. Such a purge tube is cumbersome to operate.

CN217016675U the utility model discloses a rifle head formula QuEChERS purge tube that is arranged in cereal, oil, nut pesticide residue to detect, including pipe assembly, tight closure and pipetting gun rifle head, the pipe assembly includes the pipe shaft and sets up in the link at pipe shaft top, tight closure sets up in the inside of link and seals pipetting gun rifle head periphery, pipetting gun rifle head part stretches into the inside of link and communicates with the inner chamber of pipe shaft, this kind of rifle head formula QuEChERS purge tube that is arranged in cereal, oil, nut pesticide residue to detect, through inserting pipette rifle head in the trepan boring along the gasbag ring gradually, under the effect of gasbag ring elasticity performance, with the periphery parcel of pipetting gun rifle head, if the rifle head of pipetting gun rifle head is thicker, gas in the gasbag ring has the part to flow in the explosion-proof buffer bag, plays the cushioning effect, prevents that the gasbag ring from exploding, consequently, wraps up through the elasticity of gasbag ring to keep the leakproofness between pipetting gun and the gasbag ring, prevent gas leakage specification, realize carrying out the use gasbag rifle head that the centre gripping can carry out different specifications. The structure is relatively complex.

SUMMERY OF THE UTILITY MODEL

To the prior art problem, the utility model aims to provide two kinds of high-efficient QuEChERs purge tubes, easy operation improves sample treatment efficiency.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a high-efficient QuEChERs purge tube, includes the body, its characterized in that: the improved pipe is characterized in that a piston is arranged in the upper portion of the pipe body and connected with a piston rod, the upper end of the piston rod extends out of the pipe body, a liquid outlet is formed in the bottom surface of the pipe body, two layers of sieve plates are arranged at the bottom in the pipe body, a filter membrane is clamped between the two layers of sieve plates, an adsorbent is arranged above the sieve plates, and a sealing plug is arranged at the liquid outlet.

When in use, (1) the sample is crushed; (2) extracting and separating acetonitrile which is a single solvent; (3) Adding MgSO ₄ Removing water from salts; (4) Opening a piston of a sample tube, filling adsorbents such as ethylenediamine-N-Propylsilane (PSA) and the like, adding an extracting solution, filling the extracting solution into the sample tube, filling the piston, installing a sealing plug at a liquid outlet, shaking by hand to remove impurities in the extracting solution, taking down the sealing plug, connecting a liquid outlet at the lower end of a purifying tube into a sample bottle, moving the piston downwards, filtering the liquid by a filter membrane, and then discharging the liquid from the liquid outlet into a sample bottle for GC-MS and LC-MS detection.

In the scheme, the method comprises the following steps: the part of the bottom of the pipe body, which is positioned below the sieve plate, is designed to be conical or elliptical, and the liquid outlet is positioned in the center. The bottom is designed to be conical or semi-elliptical, so that the bottom space is smaller, and the liquid can be prevented from remaining at the vacant position at the lower end of the purification tube during shaking, thereby reducing the influence on the adsorption efficiency and being beneficial to discharging the liquid.

In the scheme, the method comprises the following steps: the sealing plug comprises a rubber plug body, a clamping groove matched with the liquid outlet is formed in the upper side of the plug body, the liquid outlet is a tubular opening extending downwards, and the sealing plug is sleeved in the clamping groove.

In the scheme, the method comprises the following steps: the pipe body is divided into an upper tubular part and a lower filtering part, a circle of internal threads are arranged on the upper part of the filtering part, external threads are correspondingly arranged on the lower part of the tubular part, and the filtering part is in threaded connection below the tubular part. With filter house and the design of tubulose portion part separately, can take off the filter house like this after the use, change filter membrane, sieve etc. inside, perhaps design the filter house into disposable, avoid the cross contamination that used repeatedly leads to, and the tubulose portion is easy relatively clean, can used repeatedly. The lower filter portion may be designed to be tapered or elliptical.

In the scheme, the method comprises the following steps: a rubber gasket is arranged between the tubular part and the filtering part. Avoiding liquid leakage.

In the scheme, the method comprises the following steps: two-layer sieve is located the filter house, and two-layer sieve movable mounting, and the endotheca is in the filter house, and clearance fit blocks in the filter house, can not rock because of shaking the body, plays the effect of fixed filter membrane, uses up the back at every turn, can change sieve and filter membrane. The sieve plate adopts SPE/Plash sieve plate.

The second efficient QuEChERs purification tube comprises a tube body, and is characterized in that: the improved filter tube is characterized in that a piston is arranged in the upper portion of the tube body and connected with a piston rod, the upper end of the piston rod extends out of the tube body, the bottom surface of the tube body is flat, a liquid outlet is formed in the middle of the bottom surface of the tube body, a filter membrane is arranged at the bottom inside the tube body, a sieve plate is arranged above the filter membrane in a pressing mode, an adsorbent is arranged above the sieve plate, radially extending ribs are distributed on the bottom surface of the tube body around the liquid outlet, a channel for liquid to flow into the liquid outlet is formed between every two adjacent ribs, and the ribs are supported below the filter membrane.

In the scheme, the method comprises the following steps: the height of the ribs is 1-2mm.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses a QuEChERs purge tube adopts the form of cylinder, and the sample takes off the piston of cylinder after the extraction, adds a quantitative adsorbent earlier, adds the extract again, and manual shaking adsorbs the completion after, just can directly press the piston to filter, need not centrifugal operation, and the purge tube simple structure, convenient operation.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of embodiment 2.

Fig. 3 is a schematic structural view of embodiment 3.

FIG. 4 is a top view of the bottom surface of the tube in example 3.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

Example 1

The all around equal orientation words of the utility model only represent the relative position in the drawing, and do not represent the absolute position of the product.

Example 1

As shown in figure 1, the high-efficiency QuEChERs purification tube comprises a tube body 1, wherein a piston 2 is arranged in the upper part of the tube body 1, the piston 2 is the same as the piston of a needle cylinder, a rubber layer sealing ring is arranged at the lower end of the tube body, the piston 2 is connected with a piston rod 3, the upper end of the piston rod 3 extends out of the tube body 1, a handle is arranged at the extending end of the piston rod 3, a liquid outlet 8 is arranged on the bottom surface of the tube body 1, and the liquid outlet 8 extends outwards to form a tubular opening so as to be conveniently inserted into a liquid inlet bottle. The bottom in the body 1 is provided with two-layer sieve 4, and the sieve is SPE/plain sieve, and the diameter matches with the body, and the aperture is less than the particle size of adsorbent. The filter membrane 5 is clamped between two layers of sieve plates 4, the adsorbent 7 is arranged above the sieve plates 4, the part of the bottom of the pipe body 1, which is positioned below the sieve plates 4, is designed to be conical or elliptical, the liquid outlet 8 is positioned in the center, and the liquid outlet 8 is provided with a sealing plug 6. The sealing plug 6 comprises a rubber plug body, a clamping groove matched with the liquid outlet is formed in the upper side of the plug body, and the liquid outlet is sleeved in the clamping groove. Such a purification tube may be disposable.

Example 2

The rest is the same as in example 1, except that: the pipe body 1 is divided into an upper tubular part 101 and a lower filter part 102, the filter part 102 can be conical or semi-elliptical, the upper part of the filter part 102 is provided with a circle of internal threads, the lower part of the tubular part 101 is correspondingly provided with external threads, and the filter part is in threaded connection below the tubular part. A rubber gasket can be arranged between the tubular part and the filtering part to avoid liquid leakage. Two decks 4 are positioned within the filter house 102. Two-layer sieve is located the filter house, and two-layer sieve movable mounting, and can the endotheca in the filter house, the card can not rock along with shaking the body in the filter house. This facilitates cleaning and replacement of the filter membrane. The purification pipe can be used for multiple times, and the cost is reduced. Before use, the two parts are connected by screw thread.

Example 3

The rest of the structure is the same as that of the embodiment 1, except that as shown in fig. 3 and 4, the bottom surface of the pipe body is flat, only one layer of sieve plate is arranged, the sieve plate 4 is positioned above the filter membrane 5 and presses the filter membrane 5, a liquid outlet 8 is arranged in the center of the bottom surface of the pipe body 1, the liquid outlet 8 extends outwards to form a tubular opening, ribs 9 extending radially are distributed on the bottom surface of the pipe body of the liquid outlet around the liquid outlet 8, all the ribs 9 are supported below the filter membrane 5, and a channel for liquid to flow into the liquid outlet 8 is arranged between the adjacent ribs 9. The height of the ribs 9 is 1-2mm. The sieve is SPE/Plash sieve, and the diameter matches with the body, and the aperture is less than the particle size of adsorbent.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a high-efficient QuEChERs purge tube, includes the body, its characterized in that: the improved pipe is characterized in that a piston is arranged in the upper portion of the pipe body and connected with a piston rod, the upper end of the piston rod extends out of the pipe body, a liquid outlet is formed in the bottom surface of the pipe body, two layers of sieve plates are arranged at the bottom in the pipe body, a filter membrane is clamped between the two layers of sieve plates, an adsorbent is arranged above the sieve plates, and a sealing plug is arranged at the liquid outlet.

2. The high efficiency QuEChERs purification tube of claim 1, wherein: the part of the bottom of the pipe body, which is positioned below the sieve plate, is designed to be conical or semi-elliptical, and the liquid outlet is positioned in the center.

3. The high efficiency QuEChERs purification tube of claim 1 or 2, wherein: the sealing plug comprises a rubber plug body, a clamping groove matched with the liquid outlet is formed in the upper side of the plug body, the liquid outlet is a tubular opening extending downwards, and the sealing plug is sleeved in the clamping groove.

4. The high efficiency QuEChERs purification tube of claim 1 or 2, wherein: the body divide into the tubulose portion on upper portion and the filter house of lower part, the upper portion of filter house is provided with the round internal thread, the lower part of tubulose portion corresponds and is provided with the external screw thread, filter house threaded connection is in tubulose portion below.

5. The high efficiency QuEChERs purification tube of claim 4, wherein: a rubber gasket is arranged between the tubular part and the filtering part.

6. The high efficiency QuEChERs purification tube of claim 4, wherein: the two layers of sieve plates are positioned in the filtering part, the two layers of sieve plates are movably arranged, and the two layers of sieve plates are sleeved in the filtering part.

7. The high efficiency QuEChERs purification tube of claim 6, wherein: the sieve plate adopts an SPE/Flash sieve plate.

8. The utility model provides a high-efficient QuEChERs purge tube, includes the body, its characterized in that: the improved filter tube is characterized in that a piston is arranged in the upper portion of the tube body and connected with a piston rod, the upper end of the piston rod extends out of the tube body, the bottom surface of the tube body is flat, a liquid outlet is formed in the middle of the bottom surface of the tube body, a filter membrane is arranged at the bottom inside the tube body, a sieve plate is pressed above the filter membrane, an adsorbent is arranged above the sieve plate, radially extending ribs are distributed on the bottom surface of the tube body around the liquid outlet, a channel for liquid to flow into the liquid outlet is formed between every two adjacent ribs, and the ribs are supported below the filter membrane.

9. The high efficiency QuEChERs purification tube of claim 8, wherein: the height of the ribs is 1-2mm.

10. The high efficiency QuEChERs purification tube of claim 8, wherein: the sieve plate adopts an SPE/Flash sieve plate.