Filtering equipment for filtering soluble organic carbon in soil

Abstract

The invention relates to the technical field of soil soluble substance filtering, in particular to filtering equipment for filtering soluble organic carbon in soil, which comprises an injector (1) for absorbing a soil solution (3) and a 0.45 mu m filter membrane (2) for filtering the soluble organic carbon in the soil solution (3), the closed cavity (4) is connected with the vacuum pump (5), and the interior of the closed cavity (4) is kept in a negative pressure state under the monitoring of the pressure sensor (6); the Luer tapers (7) are hermetically mounted in an opening in the top of the closed cavity (4); a 0.45 mu m filter membrane (2) is arranged in each Luer taper (7), the upper end of each Luer taper (7) is hermetically connected with one injector (1), and the lower end of each Luer taper (7) corresponds to the center of one test tube (8) in the closed cavity (4); wherein the soil solution (3) in the injector (1) penetrates through the 0.45 mu m filter membrane (2) and flows into the test tube (8) under the action of negative pressure, so that the soluble organic carbon is filtered.

Description

Technical Field

[0001] The invention relates to the technical field of soil soluble matter filtering, and in particular to a filtering device for filtering soluble organic carbon in soil. Background Art

[0002] The rich organic carbon in the soil provides the necessary material basis for the growth of plants and animals. Soil soluble organic carbon (DOC), as one of the components of soil organic carbon, is extremely active, although it accounts for a small proportion. It is an important carrier factor for the movement of nutrients between the soil sphere and other spheres. The study of the generation and influencing factors of DOC has become the focus of current soil carbon cycle research.

[0003] Soil DOC is composed of simple organic acids and complex macromolecules, so it is difficult to give it a chemical definition. At present, the water-soluble organic carbon that passes through a 0.45μm microporous filter membrane is usually defined as soil DOC. Due to the special properties of soil DOC and its important role in carbon cycle, experts and scholars at home and abroad have conducted a lot of research on its dynamic changes and influencing factors. Summarizing the research results of predecessors is of great significance for further research on the content of DOC in different soils, migration and transformation characteristics, soil carbon cycle and protection of the ecological environment in the future.

[0004] When extracting soil DOC for experiments, the traditional method is for testers to use a plastic syringe to absorb the filtrate, install a 0.45μm filter membrane on the syringe, and then press the syringe piston by hand to filter the sample, which is very laborious and time-consuming. Since soil soluble organic carbon is a basic indicator, the test volume is often very large, and there is currently no equipment that can filter soluble organic carbon in multiple soil samples at one time. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of the traditional manual filtering method of soluble organic carbon in soil samples, which is labor-intensive, time-consuming and unable to filter multiple soil samples at the same time, thereby providing a filtering device for filtering soluble organic carbon in soil.

[0006] In order to solve the above technical problems, the technical solution of the present invention provides a filtering device for filtering soluble organic carbon in soil, comprising: a syringe 1 for sucking a soil solution 3 and a 0.45 μm filter membrane 2 for filtering the soluble organic carbon in the soil solution 3; the filtering device also includes:

[0007] The sealed cavity 4 is connected to a vacuum pump 5 and is monitored by a pressure sensor 6 to maintain a negative pressure state inside; and

[0008] A plurality of Luer connectors 7 are sealed and installed in the top opening of the closed cavity 4; each of the Luer connectors 7 is provided with the 0.45 μm filter membrane 2, the upper end of which is sealed and connected to a syringe 1, and the lower end of which corresponds to the center of a test tube 8 in the closed cavity 4; wherein,

[0009] The soil solution 3 in the syringe 1 flows into the test tube 8 through the 0.45 μm filter membrane 2 under the action of negative pressure, thereby filtering the soluble organic carbon.

[0010] As an improvement of the above-mentioned device, a test tube rack 11 for placing the test tube 8 is arranged in the closed cavity 4 .

[0011] As an improvement of the above-mentioned equipment, the side wall of the enclosed cavity 4 is provided with an opening for installing a cavity door 9; a sealing ring is provided at the edge of the cavity door 9; when the cavity door 9 is closed, the cavity door 9 is fixed at the opening of the side wall of the enclosed cavity 4 through a cavity door switch 13, and is sealed and closed with the opening of the side wall of the enclosed cavity 4 through the sealing ring.

[0012] As an improvement of the above-mentioned device, the filtering device further comprises: a controller 10 connected to the vacuum pump 5 and used for adjusting the suction force of the vacuum pump 5 .

[0013] As an improvement of the above device, the filtering device includes: at least 40 Luer connectors 7.

[0014] As an improvement of the above equipment, the test tube 8 comprises: a centrifuge tube with a capacity of 5ml-45ml.

[0015] As an improvement of the above device, the capacity of the syringe 1 is 10ml-100ml.

[0016] As an improvement to the above equipment, the negative pressure is negative 0.09 MPa.

[0017] The filtering device for filtering soluble organic carbon in soil provided by the present invention can simultaneously allow soil solutions 3 in a plurality of syringes 1 to flow into the corresponding test tubes 8 through a 0.45 μm filter membrane 2 under the action of negative pressure, thereby achieving simultaneous filtration of soluble organic carbon in a plurality of soil samples, meeting the filtering requirements for a large number of soil samples. The step of filtering, which is the most difficult for manpower, can be completed by the device provided by the present invention, thus saving manpower and time, and providing a basis for further testing of soluble organic carbon in soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a filtering device for filtering soluble organic carbon in soil provided by the present invention.

[0019] Figure ID

[0020] 1. Syringe 2. 0.45μm filter membrane 3. Soil solution

[0021] 4. Sealed cavity 5. Vacuum pump 6. Pressure sensor

[0022] 7. Luer connector 8. Test tube 9. Cavity door

[0023] 10. Controller 11. Test tube rack 12. Power switch

[0024] 13. Cavity door switch DETAILED DESCRIPTION

[0025] The technical solution provided by the present invention is further illustrated below in conjunction with embodiments.

[0026] Example

[0027] like Figure 1 As shown, the filtering device for filtering soluble organic carbon in soil provided in this embodiment includes: a syringe 1 for sucking soil solution 3 and a 0.45 μm filter membrane 2 for filtering soluble organic carbon in soil solution 3; the filtering device also includes:

[0028] The sealed cavity 4 is connected to a vacuum pump 5 and is monitored by a pressure sensor 6 to maintain a negative pressure state inside; and

[0029] A plurality of Luer connectors 7 are sealed and installed in the top opening of the closed cavity 4; each of the Luer connectors 7 is provided with the 0.45 μm filter membrane 2, the upper end of which is sealed and connected to a syringe 1, and the lower end of which corresponds to the center of a test tube 8 in the closed cavity 4; wherein,

[0030] The soil solution 3 in the syringe 1 flows into the test tube 8 through the 0.45 μm filter membrane 2 under the action of negative pressure, thereby filtering the soluble organic carbon.

[0031] Preferably, a test tube rack 11 for placing the test tube 8 is provided in the sealed cavity 4 .

[0032] Preferably, the side wall of the enclosed cavity 4 is provided with an opening for installing a cavity door 9; a sealing ring is provided at the edge of the cavity door 9; when the cavity door 9 is closed, the cavity door 9 is fixed at the opening of the side wall of the enclosed cavity 4 through a cavity door switch 13, and is sealed and closed with the opening of the side wall of the enclosed cavity 4 through the sealing ring.

[0033] Preferably, the filtering device further comprises: a controller 10 connected to the vacuum pump 5 and used for adjusting the suction force of the vacuum pump 5 .

[0034] Preferably, the filtering device comprises: at least 40 Luer connectors 7 .

[0035] Preferably, the test tube 8 comprises: a centrifuge tube with a capacity of 5ml-45ml.

[0036] Preferably, the capacity of the syringe 1 is 10ml-100ml.

[0037] Preferably, the negative pressure is negative 0.09 MPa.

[0038] In this embodiment, a vacuum pump 5 is used to connect the sealed cavity 4, and a negative pressure state is always maintained in the sealed cavity 4 through a pressure sensor 6. There are multiple Luer connectors 7 on the sealed cavity 4, and a test tube rack 11 with several holes is installed inside the cavity, and a test tube 8 is placed in each hole. In this embodiment, the test tube 8 uses a 15ml plastic centrifuge tube, and the middle of each centrifuge tube mouth corresponds to a Luer connector 7. A 0.45μm filter membrane 2 is installed on the Luer connector 7 on the sealed cavity 4, and a 10ml plastic syringe 1 is installed on the filter membrane 2 to absorb the filtrate to be filtered. After the installation of multiple syringes 1 is completed, turn on the power switch 12, click "Start", and the start of the vacuum pump 5 will cause the sealed cavity 4 to become a negative pressure state, and the filtrate in the syringe 1 will flow through the filter membrane 2 into the corresponding centrifuge tube in the sealed cavity 4 to achieve filtering of the sample filtrate.

[0039] The advantage of the present invention is that multiple samples can be filtered at one time. During the filtering process, the most difficult operations are completed by the device, which greatly improves work efficiency and saves time for detection personnel.

[0040] From the above specific description of the present invention, it can be seen that the advantage of the present invention is that it can filter at least 40 samples at a time. During the filtration process, the most difficult operations are completed by the equipment, which greatly improves work efficiency and saves time for detection personnel.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A filtering device for filtering soluble organic carbon in soil, comprising: A syringe (1) for sucking soil solution (3) and a 0.45 μm filter membrane (2) for filtering soluble organic carbon in the soil solution (3); characterized in that the filtering device also includes: The sealed cavity (4) is connected to a vacuum pump (5) and is monitored by a pressure sensor (6) to maintain a negative pressure state inside; and A plurality of Luer connectors (7) are sealed and installed in the top opening of the sealed cavity (4); each of the Luer connectors (7) is provided with the 0.45 μm filter membrane (2) inside, the upper end of which is sealed and connected to a syringe (1), and the lower end of which corresponds to the center of a test tube (8) in the sealed cavity (4); wherein, The soil solution (3) in the syringe (1) flows into the test tube (8) through the 0.45 μm filter membrane (2) under the action of negative pressure, thereby filtering the soluble organic carbon.

2. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: A test tube rack (11) for placing the test tube (8) is arranged in the sealed cavity (4).

3. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: The side wall of the sealed cavity (4) is provided with an opening for installing a cavity door (9); a sealing ring is provided at the edge of the cavity door (9); when the cavity door (9) is closed, the cavity door (9) is fixed to the opening of the side wall of the sealed cavity (4) through a cavity door switch (13), and is sealed and closed with the opening of the side wall of the sealed cavity (4) through the sealing ring.

4. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: The filtering device further comprises: a controller (10) connected to the vacuum pump (5) and used for adjusting the suction force of the vacuum pump (5).

5. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: The filtering device comprises: at least 40 Luer connectors (7).

6. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: The test tube (8) comprises a centrifuge tube with a capacity of 5ml-45ml.

7. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: The capacity of the syringe (1) is 10ml-100ml.

8. The filtering device for filtering soluble organic carbon in soil according to claim 1, characterized in that: The negative pressure is negative 0.09 MPa.

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