CN213903434U

CN213903434U - Filter membrane sample pretreatment tube for measuring particulate matters by ion chromatography

Info

Publication number: CN213903434U
Application number: CN202120064508.3U
Authority: CN
Inventors: 杨璟爱; 韩少强; 王艳丽; 王琳; 林冬; 郭晶晶; 杨健安; 赵志强; 薛鹏飞; 李天森
Original assignee: Tianjin Eco Environmental Monitoring Center
Current assignee: Tianjin Eco Environmental Monitoring Center
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-08-06
Anticipated expiration: 2031-01-11

Abstract

The utility model relates to a particulate matter filter membrane sample pretreatment tube for ion chromatography determination, which comprises a tube cover (3), a main body (6) and a pull rod (13). The tube cover (3) comprises an outlet (1), a knob (2), a microporous filter membrane layer (4) and a tube cover screw (5); the outlet (1) is positioned at the top of the tube cover (3); the knob (2) is fixed on the side surface of the outlet (1); the microporous filter membrane layer (4) and the pipe cover screw (5) are positioned on the inner side of the pipe cover (3). The main body (6) comprises a main body screw, scales (7), a tube cavity (8), a sealing piston (9), a connecting groove (10) and a base (11); the sealing piston (9) is positioned inside the main body (6); the connecting groove (10) is fixed at the bottom of the sealing piston (9). The pull rod (13) comprises a connector (12) and a handle (14). The utility model has the advantages of use extensively, the gas tightness is good, the rate of recovery is high, easy operation and experimental efficiency are high, be applicable to and handle big batch sample.

Description

Filter membrane sample pretreatment tube for measuring particulate matters by ion chromatography

Technical Field

The utility model relates to a laboratory instrument, it is specific that ion chromatography surveys particulate matter filter membrane sample pretreatment tube.

Background

The particle source analysis refers to qualitative or quantitative recognition of the source of atmospheric particle pollution in an environmental receptor by chemical, physical, mathematical and other methods. Since the sources of atmospheric particulates are wide, the sources and the proportion of the sources of the atmospheric particulates in cities are clarified, and the atmospheric particulates are a very important and complex subject for environmental management and scientific decision-making.

In the study of measuring the content of particulate matters, ion chromatography is commonly used for measuring volatile substances such as formic acid, acetic acid and the like in the particulate matters. Before measurement, a particulate filter membrane sample is generally cut into pieces and put into a sample tube filled with deionized water for ultrasonic treatment. After the ultrasound is finished, the tube cover needs to be opened, and the liquid to be detected is absorbed by the syringe. After sampling, the outlet of the injector is connected with a microporous membrane filter, and the liquid to be detected is transferred to a sample inlet cup of the ion chromatograph after being filtered. And measuring the ion concentration of the substance to be measured in the aqueous solution to obtain the content of the component to be measured in the particle sample.

Because the volumes of deionized water needed by different pretreatment methods are different, sample tubes with various volume specifications are generally needed to be prepared in laboratories, so that the material consumption cost is high and the resources are wasted.

In the ultrasonic process, due to the air in the sample tube, the volatile substance to be detected forms dynamic balance in a gas-liquid two phase, and the volatile substance to be detected can not be completely dissolved in the deionized water, so that the result of low recovery rate is caused.

After the ultrasound is finished, when the tube cover is opened and the injector is used for sampling, the liquid to be detected is fully contacted with the outside air, and the volatile object to be detected in the liquid phase is continuously transferred to the gas phase, so that the recovery rate of the object to be detected is further reduced.

Because the filter membrane fragments are suspended in the liquid to be tested, the total volume of the liquid to be tested is small, generally 25-100 ml, when the liquid to be tested is sucked by an injector, the standard caliber of the injector is small, the phenomenon that the filter membrane fragments block the opening of the injector is easy to generate, the sampling operation is difficult, time and labor are consumed, and the experimental efficiency is reduced.

In addition, a series of operations such as ultrasound, sampling and filtering are required in the pretreatment process of the particulate matter filter membrane sample, the steps are complicated, and time is consumed when a large number of samples are treated.

Therefore, the current pretreatment of the filter membrane sample for measuring the particulate matters by ion chromatography has the following problems: the common sample tube has fixed volume, can not be adjusted, has poor flexibility, can only adapt to a pretreatment method, and has narrow application range; during ultrasonic treatment, air is stored in the sample tube, and part of volatile substances to be detected are transferred into the air from deionized water, so that the recovery rate of the substances to be detected is reduced; when the sample tube cover is opened for sampling, the liquid to be detected is fully contacted with the outside air, the volatile substance to be detected in the deionized water is continuously transferred to the air phase, and the recovery rate is further reduced; when the liquid to be tested is sucked by the injector, the phenomenon that filter membrane fragments block the opening of the injector is easily generated, so that the experimental efficiency is reduced; the pretreatment steps are relatively complicated and time-consuming, and are not suitable for processing a large batch of samples.

SUMMERY OF THE UTILITY MODEL

To the problem, the utility model aims at overcoming the not enough of prior art, provide a sealed and convenient ion chromatography survey particulate matter filter membrane sample pretreatment tube. The technical scheme of the utility model as follows:

the utility model provides an ion chromatography survey particulate matter filter membrane sample preliminary treatment pipe, includes tube cap 3, main part 6 and pull rod 13, its characterized in that:

the tube cover 3 comprises an outlet 1, a knob 2, a microporous filter membrane layer 4 and a tube cover screw port 5, and the outlet 1 is positioned at the top of the tube cover 3; the knob 2 is fixed on the side surface of the outlet 1; the microporous filter membrane layer 4 is positioned on the inner side of the tube cover 3; the pipe cover screw opening 5 is positioned on the inner side of the pipe cover 3.

The main body 6 comprises a main body screw 15, a scale 7, a tube cavity 8, a sealing piston 9, a connecting groove 10 and a base 11, wherein the scale 7 is positioned on the outer side of the main body 6; the sealing piston 9 is located inside the body 6; the connecting groove 10 is fixed at the bottom of the sealing piston 9; the base 11 is located at the bottom of the body 6.

The pull rod 13 comprises a connector 12 and a handle 14, and the connector 12 is fixed on the top of the pull rod 13; the handle 14 is fixed at the bottom of the pull rod 13.

Further, the pretreatment tube for the filter membrane sample for measuring the particulate matters by the ion chromatography is characterized in that the lower part of the outlet 1 of the tube cover 3 is connected with a microporous filter membrane layer 4.

Furthermore, the pretreatment tube for the filter membrane sample for measuring the particulate matters by the ion chromatography is characterized in that the microporous filter membrane layer 4 of the tube cover 3 is a circular thin sheet and can be replaced.

Further, the filter membrane sample pretreatment tube for measuring the particulate matters by the ion chromatography is characterized in that a knob 2 of a tube cover 3 can be rotated, the knob 2 is rotated to be parallel to the axial direction of an outlet 1, and the outlet is a passage; the knob 2 is rotated to be vertical to the axial direction of the outlet 1, and the upper side and the lower side of the outlet 1 are not communicated, so that the outlet is in an isolated state.

Further, the pretreatment tube for the filter membrane sample for measuring the particulate matters by the ion chromatography is characterized in that a tube cover screw 5 of the tube cover 3 is matched with a main body screw 15 of the main body 6, the tube cover screw 5 is rotatably connected with the main body screw 15 through screws, the tube cover 3 is firmly combined with the main body 6, a tube cavity 8 of the main body 6 forms a closed space, and the microporous filter membrane layer 4 of the tube cover 3 is fixed between the inner side of the tube cover 3 and the main body screw 15 of the main body 6.

Further, the pretreatment tube for the filter membrane sample for measuring the particulate matters by the ion chromatography is characterized in that the sealing piston 9 of the main body 6 can move up and down between the main body screw 15 and the base 11 along the direction parallel to the axial direction of the main body 6, the sealing piston 9 moves towards one side of the main body screw 15, and the volume of the tube cavity 8 is reduced; the sealing piston 9 is moved toward the base 11, and the volume of the lumen 8 is increased.

Further, the filter membrane sample pretreatment tube for measuring the particulate matters by ion chromatography is characterized in that the scale 7 of the main body 6 is at least one transverse line perpendicular to the axial direction of the main body 6.

Furthermore, the pretreatment tube for the filter membrane sample for measuring the particulate matters by the ion chromatography is characterized in that the outer side of the connector 12 of the pull rod 13 is of a screw structure.

Furthermore, a particulate matter filter membrane sample pretreatment pipe is surveyed to ion chromatography, its characterized in that, the spread groove 10 inboard of main part 6 has spread groove screw 16, spread groove screw 16 with the connector 12 phase-match of pull rod 13, spread groove screw 16 with connector 12 passes through screw swivelling joint, makes pull rod 13 with the sealed piston 9 of main part 6 firmly combines.

Compared with the prior art, the utility model, beneficial effect does:

1. the volume of the pretreatment tube for measuring the particulate matter filter membrane sample by the ion chromatography is adjustable, the method can be suitable for a plurality of pretreatment methods, the application range is wide, the material consumption cost can be saved, and the resource waste can be avoided;

2. the pretreatment tube for detecting the particulate matter filter membrane sample by the ion chromatography has an exhaust function, residual gas in the tube can be exhausted by adjusting the volume in the tube, only a liquid phase is ensured in the sample tube during ultrasonic treatment, and the volatile object to be detected in deionized water is prevented from transferring to the gas phase, so that the recovery rate of the object to be detected is improved;

3. the pretreatment tube for measuring the particulate matter filter membrane sample by the ion chromatography has a liquid discharge function, after the ultrasonic process is finished, a sample tube cover does not need to be opened for sampling, the liquid to be measured in the tube can be directly discharged into the sample tube by adjusting the volume in the tube, the liquid to be measured does not contact with the external air during sampling, the loss of a volatile substance to be measured in the liquid to be measured is reduced, and the recovery rate is further improved;

4. the pretreatment tube for detecting the particulate matter filter membrane sample by the ion chromatography has a filtering function, can directly filter the liquid to be detected while discharging the liquid, simplifies the operation steps, avoids the problem that the filter membrane fragment generated by absorbing the liquid to be detected by an injector blocks the opening of the injector, and improves the experimental efficiency;

5. the pretreatment step is simple to operate, time-saving and labor-saving, and is suitable for treating large-batch samples.

So compared with the prior art, the utility model, have and use extensively, the gas tightness is good, the rate of recovery is high, easy operation and experimental efficiency height advantage, be fit for being used for handling big batch sample.

Drawings

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

Fig. 2 is a front view of the present invention.

Fig. 3 is a bottom view of the middle tube cover of the present invention.

Fig. 4 is a schematic diagram of the exhaust state of the present invention.

Fig. 5 is a schematic view of the liquid discharge state of the present invention.

In the drawings

1-Outlet 2-knob

3-pipe cover 4-microporous filter membrane layer

5-pipe cap screw 6-body

7-scale 8-tube cavity

9-sealing piston 10-connecting groove

11-base 12-connector

13-pull rod 14-handle

15-main body screw 16-connecting groove screw

17-ion chromatograph sampling tube

Detailed Description

The invention will be further described with reference to the following drawings and examples:

examples

As shown in figure 1, the filter membrane sample pretreatment tube for measuring particulate matters by ion chromatography comprises a tube cover 3, a main body 6 and a pull rod 13.

As shown in fig. 2 and 3, the tube cover 3 comprises an outlet 1, a knob 2, a microporous filter membrane layer 4 and a tube cover screw 5, wherein the outlet 1 is positioned at the top of the tube cover 3; the knob 2 is fixed on the side surface of the outlet 1; the microporous filter membrane layer 4 is positioned on the inner side of the tube cover 3; the tube cover screw mouth 5 is positioned at the inner side of the tube cover 3.

As shown in fig. 2, the main body 6 comprises a main body screw 15, a scale 7, a tube cavity 8, a sealing piston 9, a connecting groove 10 and a base 11, wherein the scale 7 is positioned on the outer side of the main body 6; the sealing piston 9 is located inside the body 6; the connecting groove 10 is fixed at the bottom of the sealing piston 9; the base 11 is located at the bottom of the body 6.

As shown in fig. 2, the pull rod 13 comprises a connector 12 and a handle 14, wherein the connector 12 is fixed on the top of the pull rod 13; the handle 14 is fixed to the bottom of the pull rod 13.

As shown in fig. 2, the lower part of the outlet 1 of the tube cover 3 is connected with a microporous filter membrane layer 4.

As shown in fig. 2 and 3, the microporous filter membrane layer 4 of the tube cover 3 is a circular thin sheet and can be replaced.

As shown in fig. 1 and 2, the knob 2 of the tube cover 3 can be rotated to rotate the knob 2 to be parallel to the axial direction of the outlet 1, and the outlet 1 is a passage; the knob 2 is rotated to be vertical to the axial direction of the outlet 1, and the upper side and the lower side of the outlet 1 are not communicated, so that the outlet is in an isolated state.

As shown in fig. 2, the cap screw 5 of the cap 3 matches the body screw 15 of the body 6; as shown in fig. 4, the cap screw 5 and the body screw 15 are screwed together, the cap 3 and the body 6 are firmly combined, the lumen 8 of the body 6 forms a closed space, and the microporous membrane layer 4 of the cap 3 is fixed between the inner side of the cap 3 and the body screw 15 of the body 6.

As shown in fig. 1, the sealing piston 9 of the main body 6 can move up and down between the main body screw 15 and the base 11 along the direction parallel to the axial direction of the main body 6, so that the sealing piston 9 moves towards the side of the main body screw 15, and the volume of the tube cavity 8 is reduced; the sealing piston 9 is moved toward the base 11, and the volume of the lumen 8 is increased. When the sealing piston 9 is positioned at the screw port 15 of the main body, the volume of the tube cavity 8 is 0 ml; when the sealing piston 9 is located at the seat 11, the volume of the lumen 8 is 100 ml.

As shown in fig. 1, the scale 7 of the main body 6 is three horizontal lines perpendicular to the axial direction of the main body 6, and when the sealing piston 9 moves to the positions of the three horizontal lines, the volumes of the corresponding tube cavities 8 are 25ml, 50ml and 75ml respectively.

As shown in fig. 2, the outer side of the connecting head 12 of the pull rod 13 is in a screw structure.

As shown in fig. 2, a connecting groove screw 16 is arranged inside the connecting groove 10 of the main body 6, and the connecting groove screw 16 is matched with the connecting head 12 of the pull rod 13; as shown in fig. 4, the connecting groove screw 16 is screwed to the connecting head 12, so that the pull rod 13 is firmly combined with the sealing piston 9 of the main body 6.

The working principle is as follows:

as shown in FIG. 4, the pretreatment tube for detecting a particulate matter filter membrane sample by ion chromatography of the present invention is used to rotatably connect the connecting groove screw 16 of the main body 6 with the connector 12 of the pull rod 13. The handle 14 of the pull rod 13 is pushed to move the sealing piston 9 to the middle transverse line of the scale 7, and the volume of the tube cavity 8 is 50 ml. The filter membrane sample to be treated is placed in the lumen 8 of the main body and filled with deionized water. The microporous filter membrane layer 4 is inserted into the tube cover 3, and the tube cover screw port 5 of the tube cover 3 is rotatably connected with the main body screw port 15 of the main body 6 through a screw port.

As shown in fig. 4, the knob 2 of the cap 3 is turned to be parallel to the axial direction of the outlet 1, the outlet 1 is set as a passage, the handle 14 of the pull rod 13 is pushed, the volume of the lumen 8 is reduced, and the air in the lumen 8 is discharged from the outlet 1. The knob 2 of the tube cover 3 is rotated to be vertical to the axial direction of the outlet 1, the upper side and the lower side of the outlet 1 are not communicated, and the tube cavity 8 is in a sealed and isolated state.

As shown in fig. 1, the coupling groove screw 16 of the main body 6 is disconnected from the coupling head 12 of the draw bar 13 by rotation. And (3) putting the main body 6 and the pipe cover 3 into an ultrasonic cleaning instrument, and performing ultrasonic pretreatment on the particulate filter membrane sample, wherein the ultrasonic time is set to be 30 min.

As shown in fig. 5, after the ultrasonic wave is stopped, the coupling groove screw 16 of the main body 6 is rotatably coupled to the coupling head 12 of the draw bar 13. The knob 2 of the cap 3 is turned to be parallel to the axial direction of the outlet 1, so that the outlet 1 is a passage. The handle 14 of the pull rod 13 is pushed to reduce the volume of the tube cavity 8, and at the moment, the liquid to be measured in the tube cavity 8 passes through the microporous filter membrane layer 4, is discharged from the outlet 1 and directly enters the sample inlet pipe 17 of the ion chromatograph. The ion chromatograph sample introduction tube 17 is inserted into the autosampler, and the sample is measured.

Claims

1. A filter membrane sample pretreatment tube for measuring particulate matters by ion chromatography comprises a tube cover (3), a main body (6) and a pull rod (13), and is characterized in that:

the tube cover (3) comprises an outlet (1), a knob (2), a microporous filter membrane layer (4) and a tube cover screw (5), and the outlet (1) is positioned at the top of the tube cover (3); the knob (2) is fixed on the side surface of the outlet (1); the microporous filter membrane layer (4) is positioned on the inner side of the tube cover (3); the pipe cover screw (5) is positioned on the inner side of the pipe cover (3);

the main body (6) comprises a main body screw (15), scales (7), a tube cavity (8), a sealing piston (9), a connecting groove (10) and a base (11), and the scales (7) are positioned on the outer side of the main body (6); the sealing piston (9) is positioned inside the main body (6); the connecting groove (10) is fixed at the bottom of the sealing piston (9); the base (11) is positioned at the bottom of the main body (6);

the pull rod (13) comprises a connector (12) and a handle (14), and the connector (12) is fixed on the top of the pull rod (13); the handle (14) is fixed at the bottom of the pull rod (13).

2. A filter membrane sample pretreatment tube for ion chromatography particulate matter determination according to claim 1, characterized in that the lower portion of the outlet (1) of the tube cover (3) is connected with the microporous filter membrane layer (4).

3. A filter membrane sample pre-processing tube for ion chromatography determination of particulate matter according to claim 1, characterized in that the microporous filter membrane layer (4) of the tube cover (3) is a circular thin sheet and is replaceable.

4. A filter sample pre-processing tube for ion chromatography particulate matter determination according to claim 1, characterized in that the knob (2) of the tube cover (3) can be turned to turn the knob (2) parallel to the axial direction of the outlet (1), the outlet (1) being a passage; the knob (2) is rotated to be vertical to the axial direction of the outlet (1), and the upper side and the lower side of the outlet (1) are not communicated and are in an isolated state.

5. The pretreatment tube for the ion chromatography determination of particulate matter filter membrane samples according to claim 1, wherein the tube cover screw (5) of the tube cover (3) is matched with the body screw (15) of the body (6), the tube cover screw (5) is rotatably connected with the body screw (15) through the screw, the tube cover (3) is firmly combined with the body (6), the tube cavity (8) of the body (6) forms a closed space, and the microporous filter membrane layer (4) of the tube cover (3) is fixed between the inner side of the tube cover (3) and the body screw (15) of the body (6).

6. The filter membrane sample pretreatment tube for ion chromatography particulate matter determination according to claim 1, wherein the sealing piston (9) of the main body (6) can move up and down between the main body screw (15) and the base (11) along a direction parallel to the axial direction of the main body (6), the sealing piston (9) is moved to the side of the main body screw (15), and the volume of the tube cavity (8) is reduced; the sealing piston (9) is moved toward the base (11) to increase the volume of the tube cavity (8).

7. A filter sample pre-processing tube for ion chromatography determination of particulate matter according to claim 1, characterized in that the scale (7) of the body (6) is at least one transverse line perpendicular to the axial direction of the body (6).

8. The pretreatment tube for a filter membrane sample for detecting particulate matters by ion chromatography according to claim 1, wherein the outer side of the connector (12) of the pull rod (13) is in a screw structure.

9. The pretreatment tube for a filter membrane sample for ion chromatography determination of particulate matters according to claim 1, wherein a connecting groove screw (16) is arranged inside the connecting groove (10) of the main body (6), the connecting groove screw (16) is matched with the connector (12) of the pull rod (13), and the connecting groove screw (16) is rotatably connected with the connector (12) through a screw, so that the pull rod (13) is firmly combined with the sealing piston (9) of the main body (6).