CN111624073A - Filter membrane sample pretreatment device and method - Google Patents

Abstract

The invention discloses a filter membrane sample pretreatment device and a method thereof, relates to the field of environment detection devices, and particularly relates to a filter membrane sample pretreatment device. Including the extraction tube, filter piston and advance appearance pipe, place the extraction tube in the filter piston in, advance appearance pipe and filter piston can dismantle with being connected, be provided with the filter core in the filter piston. The invention can solve the problems that the sample liquid is easy to pollute and the detection result is influenced due to the traditional filter membrane sample pretreatment mode, and the sample liquid flows out and is not filtered smoothly. Through the matching installation of the extraction pipe, the filtering piston and the sample inlet pipe, the filtering process is smooth, the outflow of sample liquid can be avoided, the sample ultrasonic treatment and the filtering are integrated, the sample liquid is reduced from being transferred for many times, the pollution is reduced, and the filtering time is shortened; the separation design of filtering piston and filter core can realize filtering the used repeatedly of piston, reduces the consumptive material, effective reduce cost.

Description

Filter membrane sample pretreatment device and method

Technical Field

The invention relates to the field of environment detection devices, in particular to a filter membrane sample pretreatment device and a filter membrane sample pretreatment method.

Background

The filter membrane sample analysis is an important content in the field of environmental atmosphere detection, particulate matters in environmental air are enriched on a filter membrane through pump pressure, then components (such as soluble anions and cations) enriched on the filter membrane sample are extracted into a solution by means of ultrasound and the like, and an instrument is used for measuring, so that the concentration of the components in the atmospheric particulate matters can be calculated.

When extracting components on a filter membrane sample, the ultrasonic extraction pretreatment method is widely used, the process is that the filter membrane is firstly placed in a PP centrifugal tube with a screw cap for ultrasonic treatment, a disposable syringe is used for extracting extract after the ultrasonic treatment is finished, the extract is filtered to an instrument sample inlet tube through a filter head, and then the extract is injected into an instrument for analysis, but the process has the following problems: 1. the transfer of the sample liquid for many times is easy to introduce pollution, and the detection result is influenced; 2. when the injector is used for filtering, the injector and the filter head are in a non-tight connection structure, so that sample liquid is easy to flow out and the filtering is not smooth.

Disclosure of Invention

The invention aims to provide a filter membrane sample pretreatment device and a filter membrane sample pretreatment method, which are used for solving the problems that sample liquid is easy to pollute and the detection result is influenced and the sample liquid flows outwards and is not filtered smoothly in the conventional filter membrane sample pretreatment mode.

In order to achieve the above purpose, the invention mainly provides the following technical scheme:

in a first aspect, the invention provides a filter membrane sample pretreatment device,

including the extraction tube, filter piston and advance appearance pipe, place the extraction tube in the filter piston in, advance appearance pipe and filter piston can dismantle with being connected, be provided with the filter core in the filter piston.

Further, the filtering piston comprises a threaded connection part and a piston connection part, the threaded connection part and the piston connection part are integrally formed, and the diameter of the piston connection part is equal to the inner diameter of the extraction pipe.

Further, the diameter of the threaded connection part is smaller than that of the piston connection part, and an external thread is arranged outside the threaded connection part and used for connecting the sampling tube.

Further, the center of the filtering piston is provided with a filter element groove, and the filter element groove is used for installing a filter element.

Further, the filter element comprises an extension part and a base, and the extension part and the base are integrally formed.

Furthermore, the filter element is made of hydrophilic materials.

Further, the inside internal thread that is provided with of the mouth of pipe of advancing the appearance pipe for connect and filter the piston, it is provided with the scale to advance the appearance pipe.

In a second aspect, the invention also provides a filter membrane sample pretreatment method,

the method comprises the following steps: placing a filter membrane sample in an extraction tube, adding an extracting solution, plugging a filter piston provided with a filter element into the extraction tube, and performing ultrasonic extraction on the filter membrane sample by using an ultrasonic device to form a sample solution; after extraction is finished, the sample inlet pipe is rotatably connected with the filtering piston, the sample inlet pipe is held tightly to push the filtering piston downwards, so that sample liquid permeates into the sample inlet pipe through the filter element, and sample liquid with a certain volume is obtained; and inverting the filter membrane sample pretreatment device, rotating the sample injection tube to separate the sample injection tube from the filtering piston, and measuring the sample liquid in the sample injection tube.

The technical scheme provided by the invention at least has the following advantages:

according to the invention, through the matching installation of the extraction pipe, the filtering piston and the sample inlet pipe, the filtering process is smooth, the outflow of sample liquid can be avoided, the sample ultrasonic treatment and the filtering are integrated, the sample liquid transfer is reduced for multiple times, the pollution is reduced, and the filtering time is shortened; the separation design of filtering piston and filter core can realize filtering the used repeatedly of piston, reduces the consumptive material, effective reduce cost.

Drawings

FIG. 1 is a schematic view of the overall structure of a filter membrane sample pretreatment apparatus according to the present invention.

Fig. 2 is a schematic structural diagram of an extraction tube provided by the present invention.

Fig. 3 is a schematic structural diagram of a filter piston provided by the present invention.

Fig. 4 is a schematic structural diagram of a filter element provided by the invention.

Fig. 5 is a schematic structural diagram of a sampling tube provided by the present invention.

In the figure: the device comprises anextraction pipe 1, afiltering piston 2, asampling pipe 3, a threadedconnection part 4, apiston connection part 5, afilter element groove 6, anextension part 7 and abase 8.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

The embodiment provides a filter membrane sample pretreatment device, refer to fig. 1, and the device mainly includesextraction tube 1,filters piston 2 andadvances appearance pipe 3,places extraction tube 1 in filteringpiston 2 in, filters and is provided with the filter core in thepiston 2 for filter the appearance liquid, advancesappearance pipe 3 and can dismantle withfiltering piston 2 and be connected, be used for gathering the appearance liquid of a certain volume.

Preferably, referring to fig. 2, theextraction tube 1 has an inner diameter of 20mm and a height of 100mm, and is constructed of a circular tube made of PP.

Referring to fig. 3, thefiltering piston 2 is integrally a cylindrical structure with a thin upper part and a thick lower part, and includes an upper threadedconnection part 4 and a lowerpiston connection part 5, the threadedconnection part 4 and thepiston connection part 5 are integrally formed, the diameter of the threadedconnection part 4 is smaller than that of thepiston connection part 5, an external thread is arranged outside the threadedconnection part 4 for connecting thesampling tube 3, and the diameter of thepiston connection part 5 is equal to the inner diameter of theextraction tube 1. Thefilter piston 2 is preferably of PP material, the height of the threadedconnection 4 being 5mm and the outer diameter 10 mm. The height of thepiston connecting part 5 is 15mm, and the outer diameter is 20 mm. The center of thefiltering piston 2 is provided with a hollowfilter element groove 6, and the shape and the size of thefilter element groove 6 are consistent with those of a filter element and are used for installing the filter element.

Referring to fig. 4, the filter element comprises anextension part 7 and abase 8, theextension part 7 and thebase 8 are integrally formed, the inner diameter of theextension part 7 is 5mm, the height of the extension part is 17mm, the inner diameter of thebase 8 is 10mm, the height of the base is 3mm, and the filter element is made of a hydrophilic material. The filter pore size of the filter element can be preferably selected to be 0.22 μm or 0.45 μm according to requirements.

Referring to fig. 5, an internal thread is provided inside the nozzle of thesampling tube 3 for connecting thefiltering piston 2, and thesampling tube 3 is provided with a scale for measuring the volume of the sample liquid.

The device realizes the smoothness of the filtering process and can avoid the outflow of sample liquid by matching and installing theextraction pipe 1, thefiltering piston 2 and thesample inlet pipe 3, integrates sample ultrasonic treatment and filtering, reduces the multiple transfer of the sample liquid, reduces pollution and shortens the filtering time; the separation design of thefilter piston 2 and the filter element can realize the repeated use of thefilter piston 2, reduce the material consumption and effectively reduce the cost.

In accordance with the above embodiments, the present embodiment provides a method for pre-treating a filter membrane sample, the method comprising:

placing a filter membrane sample in anextraction pipe 1, adding an extracting solution, plugging afilter piston 2 provided with a filter element into theextraction pipe 1 to seal the extraction pipe, and performing ultrasonic extraction on the filter membrane sample by using an ultrasonic device to form a sample solution;

after extraction is finished, thesample inlet pipe 3 is rotatably connected with thefiltering piston 2, thesample inlet pipe 3 is held tightly to push thefiltering piston 2 downwards, and when thefiltering piston 2 contacts sample liquid, the sample liquid permeates into thesample inlet pipe 3 through the filter element to obtain the required sample liquid with a certain volume;

and (3) inverting the filter membrane sample pretreatment device, rotating thesampling tube 3 to separate the sampling tube from thefiltering piston 2, and measuring the sample liquid in thesampling tube 3.

And after the measurement is finished, taking out the filteringpiston 2, pulling out the filter element, and cleaning thefiltering piston 2 for continuous use.

The embodiment can realize the smoothness of the filtering process, can avoid the outflow of the sample liquid, integrates the ultrasonic treatment and the filtering of the sample, reduces the multiple transfer of the sample liquid, reduces the pollution and shortens the filtering time; the separation design of thefilter piston 2 and the filter element can realize the repeated use of thefilter piston 2, reduce the material consumption and effectively reduce the cost.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims (8)

1. The utility model provides a filter membrane sample pretreatment device, its characterized in that, includes the extraction tube, filters piston and advances appearance pipe, place the extraction tube in the filtration piston in, advance appearance pipe and filter the piston and can dismantle and be connected, be provided with the filter core in the filtration piston.

2. The filter membrane sample pretreatment device according to claim 1, wherein the filter piston comprises a screw thread connection portion and a piston connection portion, the screw thread connection portion and the piston connection portion are integrally formed, and a diameter of the piston connection portion is equal to an inner diameter of the extraction tube.

3. The filter membrane sample pretreatment device according to claim 2, wherein the threaded connection portion has a smaller diameter than the piston connection portion, and an external thread is provided on an outer portion of the threaded connection portion for connecting a sample introduction tube.

4. A filter membrane sample pretreatment device according to claim 1 or 2, wherein a filter element groove for installing a filter element is provided in a center of said filter piston.

5. The filter membrane sample pretreatment device of claim 1, wherein the filter element comprises an extension and a base, and the extension and the base are integrally formed.

6. The filter membrane sample pretreatment device of claim 1, wherein said filter element is made of a hydrophilic material.

7. The filter membrane sample pretreatment device according to claim 1, wherein an internal thread is provided inside the nozzle of the sampling tube for connecting the filter piston, and the sampling tube is provided with a scale.

8. A method for pretreatment of a filter membrane sample, the method comprising:

placing a filter membrane sample in an extraction tube, adding an extracting solution, plugging a filter piston provided with a filter element into the extraction tube, and performing ultrasonic extraction on the filter membrane sample by using an ultrasonic device to form a sample solution;

after extraction is finished, the sample inlet pipe is rotatably connected with the filtering piston, the sample inlet pipe is held tightly to push the filtering piston downwards, so that sample liquid permeates into the sample inlet pipe through the filter element, and sample liquid with a certain volume is obtained;

and inverting the filter membrane sample pretreatment device, rotating the sample injection tube to separate the sample injection tube from the filtering piston, and measuring the sample liquid in the sample injection tube.

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