Filter membrane acid steaming device for detecting organic carbon in seawater particulate matters

Abstract

The utility model belongs to the technical field of marine environment detection, in particular to a filter membrane acid steaming device for detecting organic carbon in seawater particulate matters, which is characterized in that hydrochloric acid is filled at the bottom of a glass dryer, a porous support table is arranged above the liquid level of the hydrochloric acid, and one or more layers of porous acrylic trays are placed on the porous support table; a switchable top cover is arranged at the top of the glass dryer; the exhaust valve is mounted on the top cover; a hole is formed in the middle of each porous acrylic tray, the edge of each hole extends upwards in the axial direction to form a connecting frame, the porous acrylic trays of the adjacent layers are connected in an inserted mode through the connecting frames and stacked up and down, fixing grooves are evenly formed in the positions, on the peripheries of the connecting frames, of the porous acrylic trays in the circumferential direction, and porous glass dishes of different sizes can be placed in the fixing grooves. Through holes are respectively formed in the groove bottom surface of the fixing groove and the bottom surface of the perforated glass dish; and a filter membrane is placed on the bottom surface of the perforated glass dish. According to the utility model, the detection accuracy and the experiment efficiency are obviously improved, and the device is suitable for marine ecology, marine biogeochemistry research and environment monitoring.

Description

Technical Field

[0001] This utility model belongs to the field of marine environmental monitoring technology, specifically a filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter. Background Technology

[0002] Marine particulate organic matter (POM) refers to suspended organic particulate matter in the ocean, primarily originating from biological sources, terrestrial inputs, and anthropogenic activities. Accurate determination of POM content is crucial in ecology, biogeochemistry, and environmental protection. Laboratory analysis typically uses particulate organic carbon (POC) to reflect POM content. High-temperature catalytic oxidation (HTCO) is a highly accurate and simple method for determining seawater particulate organic carbon. Its pretreatment requires filtering seawater using a GF / F membrane, followed by hydrochloric acid evaporation to remove inorganic carbon from the filter sample. Since inorganic carbon constitutes a significant portion of the filter membrane, incomplete removal of residual inorganic carbon can lead to inflated POC readings; therefore, the hydrochloric acid evaporation treatment of the filter membrane is essential. However, this procedure faces several technical and practical challenges:

[0003] (1) The hydrochloric acid evaporation method relies on the reaction between gaseous hydrochloric acid and inorganic carbon (such as carbonates), but the accumulation of particulate matter may result in insufficient contact between the internal inorganic carbon and the POC determination accuracy.

[0004] (2) Traditional devices typically use petri dishes to transfer filter membrane samples. These dishes lack porous design, resulting in uneven distribution of acid gas and inorganic carbon residue, which affects the accuracy of POC determination.

[0005] (3) Hydrochloric acid vapor is highly corrosive and may damage the respiratory tract of laboratory personnel and equipment. Acid vaporization must be carried out in a closed container. Improper operation may lead to leakage or pressure buildup.

[0006] (4) If the materials of the containers for placing the filter membrane are not uniform, the filter membrane may stick to the surface of the container and cause residue, or it may introduce new organic pollution (such as plastic leaching).

[0007] (5) The sample size of filter membranes is usually large and lacks a standardized labeling system. Traditional devices are difficult to adapt to different specifications of filter membranes (such as 47mm / 25mm), which affects experimental efficiency and data reliability.

[0008] Therefore, there is an urgent need for a rationally structured, easy-to-operate, safe and reliable acid evaporation device to solve the existing problems and improve the accuracy and precision of batch seawater particulate organic carbon detection. Utility Model Content

[0009] To address the problems of uneven inorganic carbon removal and poor operational safety in traditional acid evaporation devices, the purpose of this invention is to provide a filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter.

[0010] Another objective of this invention is to provide a filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter, in order to solve the problem of chaotic sample management.

[0011] The objective of this utility model is achieved through the following technical solution:

[0012] This utility model includes a glass dryer, a porous acrylic tray, a perforated glass dish, and an exhaust valve. The bottom of the glass dryer contains hydrochloric acid, and a porous support platform is positioned above the hydrochloric acid. One or more porous acrylic trays are placed on the porous support platform. The top of the glass dryer has an operable cover, and the exhaust valve is mounted on the cover. The porous acrylic tray has a central opening, and the edge of the opening extends axially upwards to form a connecting frame. When the porous acrylic tray is multi-layered, adjacent layers are stacked by interlocking the connecting frame. The porous acrylic tray has uniformly arranged fixing grooves around the connecting frame along the circumference. Each fixing groove can hold a perforated glass dish of different sizes. Through holes are formed on the bottom surface of the fixing groove and the bottom surface of the perforated glass dish. A filter membrane is placed on the bottom surface of the perforated glass dish.

[0013] Wherein: the bottom surface of the fixed groove is evenly provided with multiple fixed support frames along the circumferential direction, each fixed support frame contains a small perforated glass dish, and the large perforated glass dishes placed in the fixed groove fall on each fixed support frame.

[0014] The height of the fixed support frame is less than the depth of the fixed groove. When a small perforated glass dish is placed in the fixed support frame, the bottom surface of the small perforated glass dish is in contact with the bottom surface of the fixed groove, and the top surface of the small perforated glass dish is flush with the upper surface of the porous acrylic tray. When a large perforated glass dish is placed in the fixed groove, the bottom surface of the large perforated glass dish is in contact with the top surface of each fixed support frame, and the top surface of the large perforated glass dish is higher than the upper surface of the porous acrylic tray.

[0015] The fixed support frame is an incomplete circle, and each fixed groove in the fixed support frame has a through hole on its bottom surface.

[0016] Both the fixing groove and the perforated glass dish are circular. The through hole on the bottom surface of the fixing groove is called through hole A, and the through hole on the bottom surface of the perforated glass dish is called through hole B. The number of through holes A on the bottom surface of the fixing groove is equal to the number of through holes B on the bottom surface of the large-sized perforated glass dish, and they correspond one-to-one. The number of through holes B on the bottom surface of the small-sized perforated glass dish is the same as the number of through holes A on the bottom surface of the fixing groove in the fixing support frame, and they correspond one-to-one.

[0017] The upper surface of the porous acrylic tray is numbered corresponding to the position of each fixing slot, and the bottom surface of each fixing slot is numbered corresponding to the position of each fixing support frame.

[0018] The connecting frame is divided into two hollow cylinders, upper and lower. The outer diameter of the lower cylinder is larger than that of the upper cylinder, thus forming a step between the upper and lower sections to support the upper porous acrylic tray. The inner diameter of the lower cylinder is larger than that of the upper cylinder, and the wall thickness of the lower cylinder is larger than that of the upper cylinder.

[0019] The advantages and positive effects of this utility model are as follows:

[0020] 1. High-efficiency carbon removal: The porous support platform, porous acrylic tray and porous glass dish of this utility model are all designed with porous structure to ensure that acid gas comes into uniform contact with the filter membrane and removes inorganic carbon.

[0021] 2. Easy to operate: The modular porous acrylic tray and fixing groove design of this utility model can be adapted to filter membranes of different specifications and is stable to install and remove.

[0022] 3. Combining safety and expandability: This utility model features an exhaust valve on the top cover to prevent pressure buildup, and the glass material reduces the risk of contamination; the porous acrylic tray can have up to eight layers, with a maximum testing throughput of 192 samples / test, and is compatible with filter molds of different specifications.

[0023] 4. Marking and management: This utility model sets numbers on the porous acrylic tray to facilitate sample classification and tracking, thereby improving experimental efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a front sectional view of the porous acrylic tray of this utility model;

[0026] Figure 3 This is a top view of the structure of the porous acrylic tray of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the perforated glass dish with a diameter of 57mm according to this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the perforated glass dish with a diameter of 30mm according to this utility model;

[0029] Wherein: 1 is a glass desiccator, 2 is a top cover, 3 is a porous support platform, 4 is a porous acrylic tray, 5 is a perforated glass dish, 6 is an exhaust valve, 7 is hydrochloric acid, 8 is a fixing tank, 9 is a fixing support frame, 10 is a connecting frame, 11 is a through hole A, 12 is a through hole B, and 13 is a step. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] like Figures 1-3 As shown, this utility model includes a glass dryer 1, a porous acrylic tray 4, a perforated glass dish 5, and an exhaust valve 6. The bottom of the glass dryer 1 is filled with hydrochloric acid 7, and a porous support platform 3 is provided above the liquid surface of the hydrochloric acid 7. One or more porous acrylic trays 4 are placed on the porous support platform 3. The top of the glass dryer 1 is provided with a switchable top cover 2, and the exhaust valve 6 is installed on the top cover 2. The porous acrylic tray 4 has a central opening, and the edge of the opening extends upward along the axial direction to form a connecting frame 10. When the porous acrylic tray 4 is multi-layered, the porous acrylic trays 4 of adjacent layers are stacked on top of each other by inserting them together through the connecting frame 10. The porous acrylic tray 4 has a fixing groove 8 evenly provided around the connecting frame 10 in the circumferential direction. Each fixing groove 8 can hold a perforated glass dish 5 of different sizes. The bottom surface of the fixing groove 8 and the bottom surface of the perforated glass dish 5 are respectively provided with through holes. A filter membrane is placed on the bottom surface of the perforated glass dish 5.

[0032] In this embodiment, the exhaust valve 6 is located on the top of the top cover 2 and is used for pressure relief and safe opening; the maximum diameter of the glass dryer 1 is 400mm.

[0033] In this embodiment, the porous support platform 3 is horizontally positioned above the liquid surface of hydrochloric acid 7 to support the porous acrylic tray 4.

[0034] In this embodiment, the porous acrylic tray 4 is a disc with a diameter of 280mm; each fixing groove 8 on the porous acrylic tray 4 is formed by a downward-facing indentation on the upper surface. The porous acrylic tray 4 adopts a detachable multi-layer design, which can be one to eight layers to accommodate different sample volumes.

[0035] In this embodiment, multiple (three in this embodiment) fixed support frames 9 are evenly arranged along the circumferential direction on the bottom surface of each fixed groove 8. A small perforated glass dish 5 is placed in each fixed support frame 9, and a large perforated glass dish 5 placed in the fixed groove 8 rests on each fixed support frame 9.

[0036] In this embodiment, the height of the fixed support frame 9 is less than the depth of the fixed groove 8. After a small-sized perforated glass dish 5 is placed in the fixed support frame 9, the bottom surface of the small-sized perforated glass dish 5 contacts the bottom surface of the fixed groove 8, and the top surface of the small-sized perforated glass dish 5 is flush with the upper surface of the porous acrylic tray 4. After a large-sized perforated glass dish 5 is placed in the fixed groove 8, the bottom surface of the large-sized perforated glass dish 5 contacts the top surface of each fixed support frame 9, and the top surface of the large-sized perforated glass dish 5 is higher than the upper surface of the porous acrylic tray 4.

[0037] In this embodiment, the fixed support frame 9 is an incomplete circle, and each fixed support frame 9 has a through hole on the bottom surface of the fixed groove 8.

[0038] In this embodiment, both the fixing groove 8 and the perforated glass dish 5 are circular. The through holes on the bottom surface of the fixing groove 8 are called through holes A11, and the through holes on the bottom surface of the perforated glass dish 5 are called through holes B12. The number of through holes A11 on the bottom surface of the fixing groove 8 is equal to the number of through holes B12 on the bottom surface of the large-sized perforated glass dish 5, and they correspond one-to-one. The number of through holes B12 on the bottom surface of the small-sized perforated glass dish 5 is the same as the number of through holes A11 on the bottom surface of the fixing groove 8 in the fixing support frame 9, and they correspond one-to-one.

[0039] The perforated glass dish 5 in this embodiment is made of high borosilicate glass, which is corrosion-resistant, easy to clean, and avoids organic contamination. The pore size is 8mm to ensure acid gas permeation.

[0040] like Figure 4 As shown, the large-sized perforated glass dish 5 in this embodiment has a diameter of 57mm, which is suitable for a 47mm glass cellulose filter membrane; seven through holes B12 with a diameter of 8mm and a height of 10mm are opened on the bottom surface.

[0041] like Figure 5 As shown, the small-sized perforated glass dish 5 in this embodiment has a diameter of 30mm, which is suitable for a 25mm glass cellulose filter membrane; a through hole B12 with a diameter of 8mm and a height of 5mm is opened in the middle of the bottom surface.

[0042] Correspondingly, in this embodiment, each fixing groove 8 has seven through holes A11 with a diameter of 8mm on its bottom surface, and each fixing support 9 has one through hole A11. The fixing groove 8 precisely fits the perforated glass dish 5 with a diameter of 57mm / 30mm to prevent displacement.

[0043] In this embodiment, each fixing slot 8 on the upper surface of the porous acrylic tray 4 is numbered (e.g., with letters), and each fixing support 9 on the bottom surface of the fixing slot 8 is numbered (e.g., with numbers). This combination of letters and numbers supports batch sample tracking.

[0044] In this embodiment, the connecting frame 10 is divided into two hollow cylindrical sections, upper and lower. The outer diameter of the lower cylindrical section is larger than that of the upper cylindrical section, thus forming a step 13 between the upper and lower sections to support the upper porous acrylic tray 4. The inner diameter of the lower cylindrical section is larger than that of the upper cylindrical section, and the wall thickness of the lower cylindrical section is larger than that of the upper cylindrical section. In this embodiment, the lower cylindrical section is 15mm high, has an inner diameter of 54mm, an outer diameter of 60mm, and a wall thickness of 3mm; the upper cylindrical section is 15mm high, has an inner diameter of 50mm, an outer diameter of 54mm, and a wall thickness of 2mm. By increasing the wall thickness (3mm) and widening the diameter (60mm) of the lower cylindrical section, the mechanical strength of the porous acrylic tray 4 is enhanced, ensuring the overall stability of the connecting frame 10.

[0045] The working principle of this utility model is as follows:

[0046] Pour hydrochloric acid 7 into the bottom of the glass desiccator 1, ensuring the liquid level is below the porous support platform 3. Assemble the porous acrylic tray 4 according to the number of samples. Place the filter membrane into the corresponding size porous glass dish 5, and then place the porous glass dish 5 into the corresponding numbered fixing slot 8 on the porous acrylic tray 4. Close the top cover 2, adjust the internal pressure of the glass desiccator 1 through the exhaust valve 6, and start the acid evaporation process (25℃, 24h). After processing, release the pressure through the exhaust valve 6, open the top cover 2, and remove the filter membrane for subsequent testing.

[0047] This invention solves the problems of uneven inorganic carbon removal, poor operational safety, and chaotic sample management in traditional acid evaporation methods through modular design, significantly improving detection accuracy and experimental efficiency. It is suitable for marine ecology, marine biogeochemistry research, and environmental monitoring.

Claims

1. A filter membrane acid steaming device for detecting organic carbon in seawater particulate matter, characterized by: The device includes a glass desiccator (1), a porous acrylic tray (4), a perforated glass dish (5), and an exhaust valve (6). The bottom of the glass desiccator (1) is filled with hydrochloric acid (7), and a porous support platform (3) is provided above the surface of the hydrochloric acid (7). One or more layers of porous acrylic trays (4) are placed on the porous support platform (3). The top of the glass desiccator (1) is provided with a switchable top cover (2), and the exhaust valve (6) is installed on the top cover (2). The porous acrylic tray (4) has a central opening with the edge of the opening pointing upwards along the axial direction. The connecting frame (10) is extended to form a multi-layer porous acrylic tray (4). When the porous acrylic tray (4) is multi-layered, the porous acrylic trays (4) of adjacent layers are stacked on top of each other by inserting the connecting frame (10). The porous acrylic tray (4) is uniformly provided with fixing grooves (8) along the circumferential direction on the periphery of the connecting frame (10). Different sizes of perforated glass dishes (5) can be placed in each fixing groove (8). The bottom surface of the fixing groove (8) and the bottom surface of the perforated glass dish (5) are respectively provided with through holes. A filter membrane is placed on the bottom surface of the perforated glass dish (5).

2. The filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter according to claim 1, characterized in that: The bottom surface of the fixed groove (8) is uniformly provided with multiple fixed support frames (9) along the circumferential direction. Each fixed support frame (9) contains a small perforated glass dish (5), and a large perforated glass dish (5) placed in the fixed groove (8) falls on each fixed support frame (9).

3. The filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter according to claim 2, characterized in that: The height of the fixed support frame (9) is less than the depth of the fixed groove (8). After the small-sized perforated glass dish (5) is placed in the fixed support frame (9), the bottom surface of the small-sized perforated glass dish (5) is in contact with the bottom surface of the fixed groove (8), and the top surface of the small-sized perforated glass dish (5) is flush with the upper surface of the porous acrylic tray (4). After the large-sized perforated glass dish (5) is placed in the fixed groove (8), the bottom surface of the large-sized perforated glass dish (5) is in contact with the top surface of each fixed support frame (9), and the top surface of the large-sized perforated glass dish (5) is higher than the upper surface of the porous acrylic tray (4).

4. The filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter according to claim 2, characterized in that: The fixed support frame (9) is an incomplete circle, and each fixed groove (8) in the fixed support frame (9) has a through hole on the bottom surface of the groove.

5. The filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter according to claim 2, characterized in that: Both the fixed groove (8) and the perforated glass dish (5) are circular. The through holes opened on the bottom surface of the fixed groove (8) are through holes A (11), and the through holes opened on the bottom surface of the perforated glass dish (5) are through holes B (12). The number of through holes A (11) on the bottom surface of the fixed groove (8) is equal to the number of through holes B (12) on the bottom surface of the large-sized perforated glass dish (5) and corresponds one-to-one. The number of through holes B (12) on the bottom surface of the small-sized perforated glass dish (5) is the same as the number of through holes A (11) on the bottom surface of the fixed groove (8) in the fixed support frame (9) and corresponds one-to-one.

6. The filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter according to claim 2, characterized in that: The upper surface of the porous acrylic tray (4) is numbered corresponding to the position of each fixing groove (8), and the bottom surface of each fixing groove (8) is numbered corresponding to the position of each fixing support frame (9).

7. The filter membrane acid evaporation device for detecting organic carbon in seawater particulate matter according to claim 1, characterized in that: The connecting frame (10) is divided into two hollow cylinders, the outer diameter of the lower cylinder is larger than that of the upper cylinder, and thus a step (13) supporting the upper porous acrylic tray (4) is formed between the upper and lower sections. The inner diameter of the lower cylinder is larger than that of the upper cylinder, and the wall thickness of the lower cylinder is larger than that of the upper cylinder.

Images