A soil and sediment semi-volatile organic compound sample pre-treatment purification rack

Abstract

This utility model relates to the field of environmental monitoring and chemical analysis technology, specifically a pretreatment and purification rack for semi-volatile organic compounds in soil and sediment samples. It includes a three-layer single-row rack, with the rack consisting of a first layer, a second layer, and a third layer from top to bottom. The first layer has multiple first holes for supporting funnels, with the diameter of the first hole being smaller than the maximum outer diameter of the funnel. The second layer has multiple second holes for supporting adsorption columns, with the diameter of the second hole being smaller than the outer diameter of the upper flange of the adsorption column but larger than the outer diameter of the column body. The third layer has multiple third holes for accommodating concentration cups, with the diameter of the third hole being larger than the maximum outer diameter of the concentration cup. The multiple first holes, second holes, and third holes form multiple sets of positioning holes. The first, second, and third holes in each set of positioning holes are coaxially arranged in the vertical direction. This utility model solves the problems of unstable operation, inconvenient handling, and the need for simultaneous operation of traditional multi-layer test tube racks.

Description

Technical Field

[0001] This utility model relates to the field of environmental monitoring and chemical analysis technology, specifically a pretreatment and purification rack for semi-volatile organic compounds in soil and sediment samples. Background Technology

[0002] In the pretreatment process for determining semi-volatile organic compounds (SOCs) in soil and sediments, filtration, adsorption purification, and concentration collection are required sequentially. Traditional methods typically involve stacking three independent test tube racks to hold the funnel, adsorption column, and concentration cup, respectively. However, the inherent drawbacks of this approach are becoming increasingly apparent: First, the common multi-row, multi-pore layout of test tube racks makes it difficult to individually remove or place samples after processing; one must wait until the entire batch of samples has been processed, otherwise cross-contamination or loss of samples is likely, resulting in extremely poor operational flexibility. Second, simply stacking multiple independent racks poses a risk of insufficient stability, making them prone to shaking or tipping during experiments. Third, the difficulty in precisely aligning the centers of the containers in each layer can lead to liquid splashing, affecting the accuracy and reliability of experimental results. Therefore, a convenient purification device is urgently needed to meet the requirements of efficient and accurate experiments. Utility Model Content

[0003] The purpose of this invention is to provide a pretreatment and purification rack for semi-volatile organic compounds in soil and sediment samples to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pretreatment and purification rack for semi-volatile organic compounds in soil and sediment samples, comprising a three-layer single-row rack, wherein the rack consists of a first layer, a second layer, and a third layer from top to bottom. The first layer has multiple first holes for supporting funnels, the diameter of which is smaller than the maximum outer diameter of the funnel. The second layer has multiple second holes for supporting adsorption columns, the diameter of which is smaller than the outer diameter of the upper flange of the adsorption column but larger than the outer diameter of the column body. The third layer has multiple third holes for accommodating concentration cups, the diameter of which is larger than the maximum outer diameter of the concentration cup. The bottom of the third layer also has a circular hole for fixing the bottom of the concentration cup. The multiple first holes, multiple second holes, and multiple third holes form multiple sets of positioning holes, and the first holes, second holes, and third holes in each set of positioning holes are coaxially arranged in the vertical direction.

[0005] Preferably, the total height of the frame is 400-450mm, the distance between the first and second layers is 95-105mm, the distance between the second and third layers is not less than 150mm, and the height of the third layer is less than 150mm.

[0006] Preferably, there is a gap of 15-30mm between the bottom of the third layer and the tabletop.

[0007] Preferably, the diameter of the second hole is 12-18 mm.

[0008] Preferably, the diameter of the circular hole is 3-8 mm.

[0009] Preferably, the frame is made of transparent plexiglass material.

[0010] Preferably, the number of the multiple sets of positioning holes is 4-8 sets.

[0011] Compared with existing technologies, this utility model provides a pretreatment purification rack for semi-volatile organic compounds in soil and sediment samples, offering the following advantages: This utility model integrates the placement of funnels, adsorption columns, and concentration cups into a single rack, ensuring coaxiality. This allows for precise and smooth flow of sample liquid from top to bottom, completing the entire filtration, purification, and collection process, significantly improving operational convenience and workflow continuity. The single-row layout makes each sample position independent and easily accessible, allowing researchers to individually pick up, place, or observe any sample at any time without waiting for the entire batch of experiments to finish, significantly improving experimental efficiency and avoiding cross-contamination. The rack is made of transparent plexiglass, which is not only chemically resistant, lightweight, and durable, but also facilitates real-time observation of the experimental progress and liquid flow status of each layer. Furthermore, the precisely designed layer height spacing ensures optimal space for the standard funnel, adsorption column, and concentration cup, while the pre-reserved gaps and fixing holes at the bottom enhance the stability of the concentration cup placement and the overall ventilation of the rack. This invention features a reasonable structure, flexible operation, and stable reliability, effectively overcoming many drawbacks of traditional multi-layer test tube racks. It is particularly suitable for the purification operation of soil and sediment semi-volatile organic compound sample pretreatment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the funnel structure involved in this utility model; Figure 3 This is a schematic diagram of the adsorption column structure involved in this utility model; Figure 4 This is a schematic diagram of the concentration cup structure involved in this utility model.

[0013] Explanation of reference numerals in the attached diagram: 1. Frame; 11. First layer; 12. Second layer; 13. Third layer; 2. Funnel; 21. First orifice; 3. Adsorption column; 31. Second orifice; 4. Concentration cup; 41. Third orifice; 5. Round hole. Detailed Implementation

[0014] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model: like Figure 1-4 As shown, this utility model provides a pretreatment purification rack for semi-volatile organic compounds in soil and sediment samples, including a three-layer single-row rack 1. The rack 1 is made of transparent plexiglass material, which makes full use of the high transparency of plexiglass to facilitate real-time observation of the experimental status and liquid flow of each layer. Its good chemical stability can withstand various organic solvents and chemical reagents commonly used in sample pretreatment. It is not easily corroded and its light weight makes the whole device easy to move and operate.

[0015] The total height of the frame 1 is 400-450mm to accommodate the operating height of most laboratory benchtops. From top to bottom, the frame 1 consists of three layers: 11, 12, and 13. The distance between layers 11 and 12 is 95-105mm. This height provides installation space for the standard funnel 2 (approximately 95mm high), ensuring that the funnel 2 can be effectively fixed and its outlet extends sufficiently into the second layer. The distance between layers 12 and 13 is no less than 150mm. This space is to meet the length requirements of the standard adsorption column and provide ample operating and observation space for the purification process. The height of the third layer 13 is less than 150mm, ensuring sufficient depth for the concentration cup 4.

[0016] The first layer 11 has multiple first holes 21 for supporting the funnel 2. The diameter of the first hole 21 is d1, and the diameter of the funnel 2 is d2. The diameter of the first hole 21 is slightly smaller than the maximum outer diameter of the funnel 2, that is, d1 is smaller than d2. This size design allows the neck part of the funnel 2 to pass smoothly through the first hole 21 when it is put in, while the expanded part of the funnel 2 can be firmly held by the edge of the hole, which not only ensures the stability of the funnel 2, but also ensures that its center position is accurate.

[0017] The second layer 12 is provided with multiple second holes 31 for supporting the adsorption column 3. The diameter of the second hole 31 is d3, which is 12-18mm. The diameter of the upper flange of the adsorption column 3 is d4, and the diameter of the column body of the adsorption column 3 is d5. The diameter of the second hole 31 is smaller than the outer diameter of the upper flange of the adsorption column 3 and larger than the outer diameter of its column body, that is, d3 is smaller than d4 and larger than d5. This design allows the column body of the adsorption column 3 to extend into the hole, while its upper flange is supported on the edge of the hole, thereby achieving the suspension and fixation of the adsorption column 3 and ensuring that the liquid flowing out from the upper funnel 2 can accurately drip into the core of the adsorption column 3.

[0018] The third layer 13 has multiple third holes 41 for accommodating the concentration cup 4. The diameter of the third hole 41 is d6, and the diameter of the concentration cup 4 is d7. The diameter of the third hole 41 is larger than the maximum outer diameter of the concentration cup 4, i.e., d6 is larger than d7, which facilitates easy insertion and removal of the concentration cup 4 by the experimenter. At the bottom of the third layer 13, corresponding to the center of each third hole 41, there is also a circular hole 5 for fixing the bottom of the concentration cup 4. The diameter of the circular hole 5 is 3-8mm. The function of this circular hole 5 is to accommodate and fix the bottom tip of the concentration cup 4, preventing the concentration cup 4 from moving or tilting due to its smooth bottom when receiving liquid, thus enhancing the stability during operation.

[0019] The bottom of the third layer 13 has a gap of 15-30mm between it and the tabletop, which facilitates ventilation and cleaning of the bottom of the frame. Multiple first holes 21, multiple second holes 31 and multiple third holes 41 form multiple sets of positioning holes, with 4-8 sets of positioning holes. The first holes 21, second holes 31 and third holes 41 in each set of positioning holes are coaxially arranged in the vertical direction.

[0020] The workflow of this invention is as follows: During the experiment, funnel 2 is inserted into the first pore 21 of the first layer 11, filled with filter paper and anhydrous sodium sulfate for filtration and water removal; adsorption column 3 is placed in the corresponding second pore 31 of the second layer 12; concentration cup 4 is placed in the third pore 41 of the third layer 13, with its bottom embedded in the circular hole 5 for fixation. Since the three pores are coaxial, the sample liquid can be filtered sequentially through funnel 2, purified by adsorption column 3, and finally collected by dripping into concentration cup 4. The single-row design allows each sample to be independent, enabling researchers to process or remove samples at any location individually without interference, greatly improving the flexibility and efficiency of the experiment.

[0021] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A soil and sediment semi-volatile organic compound sample pre-treatment cleanup rack characterized by: The system includes a three-layer single-row frame (1), which consists of a first layer (11), a second layer (12), and a third layer (13) from top to bottom. The first layer (11) has multiple first holes (21) for supporting the funnel (2), and the diameter of the first holes (21) is smaller than the maximum outer diameter of the funnel (2). The second layer (12) has multiple second holes (31) for supporting the adsorption column (3), and the diameter of the second holes (31) is smaller than the outer diameter of the upper flange of the adsorption column (3) but larger than the outer diameter of its column body. The third layer (13) is provided with a plurality of third holes (41) for accommodating the concentration cup (4). The diameter of the third hole (41) is larger than the maximum outer diameter of the concentration cup (4). The bottom of the third layer (13) is also provided with a round hole (5) for fixing the bottom of the concentration cup (4). The plurality of first holes (21), the plurality of second holes (31) and the plurality of third holes (41) form a plurality of sets of positioning holes. The first hole (21), the second hole (31) and the third hole (41) in each set of positioning holes are coaxially arranged in the vertical direction.

2. The soil and sediment semi-volatile organic compound sample preparation and cleanup rack of claim 1, wherein: The total height of the frame (1) is 400-450mm, the distance between the first layer (11) and the second layer (12) is 95-105mm, the distance between the second layer (12) and the third layer (13) is not less than 150mm, and the height of the third layer (13) is less than 150mm.

3. The soil and sediment semi-volatile organic compound sample preparation and cleanup rack of claim 1, wherein: The bottom of the third layer (13) has a gap of 15-30mm in height between it and the tabletop.

4. The soil and sediment semi-volatile organic compound sample preparation and cleanup rack of claim 1, wherein: The diameter of the second hole (31) is 12-18 mm.

5. The soil and sediment semi-volatile organic compound sample pretreatment and purification rack according to claim 1, characterized in that: The diameter of the circular hole (5) is 3-8 mm.

6. The soil and sediment semi-volatile organic compound sample preparation and cleanup rack of claim 1, wherein: The frame (1) is made of transparent plexiglass material.

7. The soil and sediment semi-volatile organic compound sample pretreatment and purification rack according to claim 1, characterized in that: The number of the multiple sets of positioning holes is 4-8 sets.

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