A sampling device for perfluorinated water bodies

Abstract

The present invention discloses a sampling device for perfluorinated water bodies. It comprises: a sample collection module, including a sample storage bottle for storing water samples; a compound enrichment component, including at least two compound enrichment modules, each of which is selectively connected to the sample storage bottle; a monitoring component, including a speed monitor for monitoring the liquid output speed of each compound enrichment module; a processor, the processor being connected to the monitoring component and used to receive monitoring data from the monitoring component and determine the current enrichment amount of the compound enrichment module currently connected to the sample storage bottle based on the monitoring data. The sampling device for perfluorinated water bodies in this application can directly enrich perfluorinated compounds in water samples at the field sampling site, can ensure that the target compounds are fully concentrated, improve detection sensitivity, and has a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the field of groundwater pollutant collection, and in particular to a sampling device for perfluorinated contaminated water bodies. Background Art

[0002] In the field of environmental monitoring, perfluorinated compounds (PFCs) have become an important indicator for water pollution detection due to their high toxicity, persistence and bioaccumulation.

[0003] In related technologies, the detection and analysis of perfluorinated compounds in water bodies is mainly divided into three steps: sample collection, sample pre-processing, and instrumental analysis. A more mature detection process involves researchers collecting groundwater samples in the field, sealing them, and then sending them to the laboratory for pre-processing such as metering, filtration, and solid-phase extraction. High-performance liquid chromatography-tandem mass spectrometry is then used for detection. This process requires the long-distance transportation and storage of large quantities of samples, which is not only time-consuming, labor-intensive, and costly, but also may lead to secondary contamination during this period, affecting the accuracy of the test data. Summary of the Invention

[0004] The invention discloses a sampling device for perfluorinated water bodies, which aims to solve the technical problem of long-distance transportation and great difficulty in preservation of a large number of samples in the sampling process of perfluorinated water bodies in the related art.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application provides a sampling device for perfluorinated contaminated water, comprising:

[0007] a sample collection module, comprising a sample storage bottle for storing a water sample;

[0008] A compound enrichment assembly comprising at least two compound enrichment modules, each of which is selectively connected to the sample storage bottle, and the water sample in the sample storage bottle can flow into the compound enrichment module currently connected to the sample storage bottle;

[0009] A monitoring component, including a speed monitor for monitoring the liquid output speed of each compound enrichment module;

[0010] A processor is connected to the monitoring component and is used to receive monitoring data from the monitoring component and determine a current enrichment amount of the compound enrichment module currently connected to the sample storage bottle based on the monitoring data.

[0011] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0012] (1) The sampling device for perfluorinated water bodies in this application can directly enrich perfluorinated compounds in water samples at the field sampling site, eliminating the need to transport large amounts of water samples over long distances to the laboratory, significantly reducing transportation costs and time costs, while avoiding the risk of secondary contamination that may occur during transportation, and ensuring the originality of the samples and the accuracy of the test data.

[0013] (2) The sampling device for perfluorinated contaminated water bodies in this application has a selective connection mechanism of multiple compound enrichment modules, which enables the device to continuously enrich the water sample until it reaches a saturated state, ensuring that the target compound is fully concentrated and improving the detection sensitivity. The coordinated work of the speed monitor and the processor realizes real-time dynamic monitoring of the enrichment process, accurately judges the saturation level of the enrichment module by the change of the liquid outlet speed, and automatically switches to the backup module to avoid manual judgment errors and enhance the reliability and stability of the enrichment process. This solution advances the sample pretreatment link to the sampling site, simplifies the detection process, and provides an efficient solution for the rapid and accurate detection of perfluorinated compounds. It is particularly suitable for emergency monitoring and large-scale environmental survey scenarios.

[0014] (3) The sampling device for perfluorinated water bodies in this application has a modular design that supports the rapid replacement of filler types. In addition to perfluorinated compounds, it can also be adapted for the enrichment detection of other pollutants. At the same time, the optimization of the device size and power consumption makes it suitable for remote areas or emergency monitoring scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural diagram of an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A magnified schematic diagram of part A in the middle;

[0018] Figure 3 yes Figure 1 A magnified schematic diagram of part B in the middle;

[0019] Figure 4 This is a front view of an embodiment of the present application;

[0020] Figure 5 yes Figure 4 Enlarged schematic diagram of the middle C part;

[0021] Figure 6 This is a structural diagram of another angle of the embodiment of the present application;

[0022] Figure 7 is a rear view of an embodiment of the present application;

[0023] Figure 8 A front view of another embodiment of the present application;

[0024] Figure 9 A rear view of another embodiment of the present application;

[0025] Figure 10 Schematic diagram of the state during elution in another embodiment of the present application Figure 1 ;

[0026] Figure 11 Schematic diagram of the state during elution in another embodiment of the present application Figure 2 ;

[0027] Figure 12 Schematic diagram of the principle of enrichment in the examples of this application;

[0028] Figure 13 It is a schematic diagram of the principle of elution in the examples of the present application.

[0029] Figure: 1, sample storage bottle; 2, liquid outlet pipe; 3, enrichment chamber; 301, chamber; 302, cover; 4, eccentric pressing piece; 401, operating handle; 402, eccentric cam; 5, pivot shaft; 6, drain valve; 7, compound enrichment module; 8, eluent collection container; 9, suction pipe; 10, installation box; 11, guide rail; 12, slider; 13, installation plate; 14, installation guide column; 15, infrared sensor; 16, guide rod ; 17. First coil compression spring; 18. Cleaning and draining pipeline; 19. Sample injection branch; 20. Three-way valve; 21. Waste liquid discharge pipe; 22. Collection head; 23. Support foot; 24. Collection tube; 25. First support plate; 26. Vacuum pump; 28. Second support plate; 29. ​​Second limiting hole; 30. Cable channel; 31. Counterweight block; 32. Valve body box; 33. Connecting ear; 34. Elastic sealing ring; 35. Second coil compression spring; 36. Sampling suction pump. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0031] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0032] In the prior art, outdoor (field) sampling and testing for perfluorinated water requires first enriching the perfluorinated compounds in the sampled water, followed by laboratory elution and analysis to obtain test results. Because perfluorinated compound concentrations vary significantly between sampling points, and the actual perfluorinated compound content in water samples is difficult to determine in advance during field sampling, the prior art is prone to overloading the enrichment equipment during the perfluorinated compound enrichment process. This means that the total amount of perfluorinated compounds in the water sample exceeds the upper limit of the enrichment equipment's single enrichment capacity. Overloading the enrichment equipment can cause some perfluorinated compounds to escape, meaning that the perfluorinated compounds in the water sample are not fully enriched. Consequently, in the prior art, sampling and testing of perfluorinated water samples can easily result in significantly lower test data, seriously impacting the accuracy and reliability of monitoring results. To circumvent this issue, prior art uses ultra-large-capacity enrichment equipment to enrich perfluorinated compounds in water samples. However, this increases consumable costs and operational burden, making it difficult to meet the needs of large-scale environmental monitoring.

[0033] like Figures 1-13 As shown:

[0034] The present application provides a sampling device for perfluorinated water, comprising:

[0035] The sample collection module includes a sample storage bottle 1 for storing water samples;

[0036] The compound enrichment assembly includes at least two compound enrichment modules 7, each of which is selectively connected to the sample storage bottle 1, and the water sample in the sample storage bottle 1 can flow into the compound enrichment module 7 currently connected to the sample storage bottle 1; the compound enrichment module 7 can be a device or component that adsorbs the target compound. Specifically, the target compound can be enriched by adsorption. Exemplarily, the compound enrichment module 7 can be, but is not limited to, a solid phase extraction column;

[0037] A monitoring component, including a speed monitor for monitoring the liquid output speed of each compound enrichment module 7;

[0038] A processor is connected to the monitoring component and is used to receive monitoring data from the monitoring component and determine a current enrichment amount of the compound enrichment module 7 currently connected to the sample storage bottle 1 according to the monitoring data.

[0039] The method for sampling a perfluorinated water body using the sampling device comprises the following steps:

[0040] S10, injecting the perfluorinated contaminated water into the sample storage bottle 1 of the compound enrichment module 7;

[0041] S20, the processor controls the sample storage bottle 1 to be connected to the liquid inlet end of at least one compound enrichment module 7 to enrich the target compound;

[0042] S30. The liquid outlet speed of the selected compound enrichment module 7 is monitored in real time by a speed monitor, and the current enrichment amount of the compound enrichment module 7 currently connected to the sample storage bottle 1 is determined based on the monitored liquid outlet speed data. When the current enrichment amount reaches a preset value, the compound enrichment module 7 is replaced; the preset value may be the maximum enrichment amount of the compound enrichment module 7, or may be less than its maximum enrichment amount, for example, 80%, 85%, 90% or 95% of the maximum enrichment amount of the compound enrichment module 7.

[0043] In some embodiments, the monitoring component further comprises:

[0044] A first liquid level detection component, the first liquid level detection component is used to obtain first liquid level data, the first liquid level data is the liquid level height in the sample storage bottle 1, and the liquid level height is the height difference between the bottom and the liquid surface in the sample storage bottle 1;

[0045] a second liquid level detection component, which is used to obtain second liquid level data, wherein the second liquid level data is the liquid level height in the compound enrichment module 7, and the liquid level height is the height difference between the bottom of the liquid space inside the compound enrichment module 7 and the liquid surface;

[0046] The processor determines the maximum volume of the processed water sample based on the first liquid level data, the second liquid level data, the current enrichment amount, and the current maximum enrichment amount of the compound enrichment module 7. The maximum volume of the processed water sample is the maximum volume of the current water sample that the compound enrichment module 7 can process. The maximum enrichment amount of each compound enrichment module 7 is known and can be calibrated in advance in the laboratory. The method for obtaining the maximum volume of the processed water sample of the compound enrichment module 7 is as follows:

[0047] First, the current processed water sample volume V1 can be calculated by the following formula (1):

[0048] V1=S1·(h0-h1)-S2·(h3-h2) (1)

[0049] Wherein, S1 is the bottom area of ​​the sample storage bottle; S2 is the cross-sectional area of ​​the compound enrichment module 7;

[0050] The first liquid level data before enrichment is h0, and the first liquid level data at the current enrichment moment is h1;

[0051] The compound enrichment module 7 is filled with an enrichment material for enriching the target compound, and its filling height is h2. The second liquid level data at the current enrichment moment is h3. The enrichment material contains a small amount of water sample, but the volume of the water sample contained in the enrichment material is small. Therefore, the volume of the water sample in the enrichment material at the current enrichment moment can be ignored, and the current volume of the enriched water sample is calculated;

[0052] Furthermore, the current volume of the water sample processed by the compound enrichment module 7 and the current enrichment amount have a proportional relationship with the maximum volume of the water sample processed and the maximum enrichment amount as shown in the following formula (2):

[0053] V1 / M1=V max / M max (2);

[0054] M1 is the current enrichment amount of the compound enrichment module 7, and V1 is the volume of the water sample currently processed by the compound enrichment module 7; M max is the maximum enrichment amount of compound enrichment module 7, V max is the maximum volume of water sample processed by compound enrichment module 7;

[0055] Finally, the maximum volume of water sample processed by compound enrichment module 7 can be obtained and calculated by the following formula (3):

[0056] V max =(V1 / M1)·M max (3).

[0057] In some embodiments, the first liquid level detection assembly includes a first liquid level sensor, which is electrically connected to the processor; the second liquid level detection assembly includes a second liquid level sensor, which is electrically connected to the processor.

[0058] In some embodiments, the sampling device further comprises a warning module.

[0059] The first liquid level detection component is further used to obtain third liquid level data, where the third liquid level data is initial liquid level data in the sample storage bottle 1;

[0060] The processor is connected to the warning module, and the processor is further used to determine the volume of the water sample discharged from the sample storage bottle 1 according to the third liquid level data and the first liquid level data; and 排 Equal to the maximum processed water sample volume V max In the case of 80%-100% of V 排 =(80%-100%)·V max When the alarm is triggered, the alarm module is controlled to issue an alarm message.

[0061] The volume of water sample V discharged from sample storage bottle 1 排 It can be calculated by the following formula (4):

[0062] V 排 =S1·(h0-h1) (4)

[0063] Wherein, S1 is the bottom area of ​​the sample storage bottle 1; the first liquid level data before enrichment is h0, and the first liquid level data at the current enrichment moment is h1.

[0064] In some embodiments, the warning module is provided with an indicator light, a display, a speaker or a buzzer. The purpose of setting the warning module is to remind the user to quickly switch or replace the compound enrichment module 7; the current enrichment amount reaches the preset value, that is, meets V 排 =(80%-100%)·V max When the V 排 80%·V max 、85%·V max 、90%·V max or 95%·V max , when the preset V 排 , an alarm or a sound prompting to switch or replace the compound enrichment module 7 is issued.

[0065] In some embodiments, the compound enrichment component includes an enrichment chamber 3 and a waste liquid discharge channel provided at the bottom of the enrichment chamber 3, and the compound enrichment module 7 is provided in the enrichment chamber 3; the enrichment chamber 3 includes a chamber 301 having at least one open end and a cover 302 adapted to the open end of the chamber 301, and the cover 302 is detachably and sealedly connected to the open end of the chamber 301; the chamber 301 is designed with a detachable and sealed connection between the open end and the cover 302, which facilitates the user to directly open the chamber 301 to replace or maintain the internal compound enrichment module 7. When each compound enrichment module 7 in the chamber 301 is saturated with adsorption, the cover 302 can be quickly removed to replace or regenerate the compound enrichment module 7. At the same time, the sealing structure ensures that the pressure in the chamber 301 is stable when the negative pressure drive assembly is working, thereby ensuring the reliability of the enrichment process;

[0066] The sampling device further includes a negative pressure drive assembly, which includes a negative pressure generating device, a suction pipe 9, and a pressure regulating unit; the negative pressure generating device is connected to the enrichment chamber 3 through the suction pipe 9; the pressure regulating unit is arranged on the fluid path of the suction pipe 9 and includes at least one adjustable pressure control valve;

[0067] The monitoring assembly further includes a pressure sensor for monitoring the pressure in the enrichment bin 3;

[0068] Among them, the negative pressure generating device, the adjustable pressure regulating valve, and the pressure sensor are electrically connected to the processor respectively. It is understandable that when the water sample is enriched, the processor dynamically adjusts the adjustable pressure control valve according to the monitoring data to maintain the negative pressure in the enrichment chamber 3 stable; after the enrichment is completed, the waste liquid discharge channel is opened to discharge the waste liquid generated in the enrichment process. Thus, a dual monitoring mechanism is adopted to provide real-time feedback on the status of the compound enrichment module 7, further ensuring the enrichment accuracy. The monitoring component forms a linkage monitoring with the pressure sensor through the speed monitor, and the processor dynamically adjusts the adjustable pressure control valve according to the monitoring data to maintain the negative pressure in the enrichment chamber 3 stable; and based on the preset mapping relationship between the pressure in the enrichment chamber 3 and the liquid outlet speed of the compound enrichment module 7 (specifically, it can be calibrated by pre-laboratory calibration), the current enrichment amount of the compound enrichment module 7 is obtained.

[0069] In some embodiments, the sampling device further includes an eluent collection container 8 for collecting eluent, and the eluent collection container 8 is detachably mounted within the chamber body 301. It is understood that the detachable mounting of the eluent collection container 8 within the chamber body 301 facilitates direct removal of the eluent collection container 8 from the chamber body 301 after completion of the laboratory elution operation of the compound enrichment module 7, thereby avoiding spillage or contamination of the eluent during transfer and ensuring the integrity of the test sample. This is particularly suitable for scenarios where field sampling requires bringing samples back to the laboratory for multiple batches of testing, ensuring the convenience and standardization of the testing process.

[0070] In some embodiments, the sampling device further comprises a mounting box 10 having a hollow structure; the chamber 301 and the sample storage bottle 1 are both mounted on the upper side of the mounting box 10; a guide rail 11 is provided on the upper surface of the mounting box 10, and a slider 12 is provided on the bottom surface of the chamber 301 to slide with the guide rail 11; when the cover 302 is separated from the chamber 301, the chamber 301 can be moved relative to the mounting box 10 along the guide rail 11 via the slider 12. It is understood that the mounting box 10, through the cooperation between the guide rail 11 and the slider 12, allows the chamber 301 to slide along the guide rail 11 when the cover 302 is separated, thereby facilitating operations such as replacement of the compound enrichment module 7 and replacement of the filler by the user. This movable design breaks the spatial limitations of the traditional fixed chamber 301 and is particularly suitable for equipment maintenance in complex field environments, reducing the difficulty of disassembly for operators and improving the flexibility of on-site operations.

[0071] In some embodiments, the sampling device further comprises a height control component, wherein the height control component comprises:

[0072] Installing a platform 13 for fixing and carrying the sample storage bottle 1;

[0073] Install the guide column 14, which is vertically fixed to the upper surface of the box and passes through the installation plate 13 to form a sliding guide structure;

[0074] The elastic support unit is provided between the bottom surface of the mounting plate 13 and the upper surface of the box body, and its elastic deformation is adapted to the mass of the sample in the sample storage bottle 1;

[0075] The elastic force adjustment mechanism of the elastic support unit is configured such that, during the target compound enrichment process, the displacement of the sample storage bottle 1 caused by the flow of the solution is dynamically compensated by the guiding action of the guide post 14, thereby maintaining a constant height between the sample liquid level in the sample storage bottle 1 and the horizontal plane. It is understood that the height control component dynamically compensates for the displacement of the sample storage bottle 1 caused by the flow of the solution through the linkage between the elastic support unit and the guide post, ensuring a constant sample liquid level. This design avoids the problem of unstable liquid discharge rate caused by liquid level fluctuations in traditional enrichment processes, ensuring that the adsorption process of the compound enrichment module 7 is always under uniform flow conditions, thereby improving the consistency of perfluorinated compound adsorption and the reliability of detection data.

[0076] In some embodiments, the mounting plate 13 is rectangular; the mounting guide posts 14 are four in number and vertically positioned at the four corners of the mounting plate 13; and the elastic support unit includes four second helical compression springs 35, each of which is sleeved around the outer circumference of the four mounting guide posts 14. It will be appreciated that the rectangular mounting plate 13, combined with the four corner guide posts and second helical compression springs 35, forms a symmetrical elastic support structure, evenly distributing the weight of the sample storage bottle 1 across the four second helical compression springs 35. This design effectively prevents tilting or displacement of the mounting plate 13 due to unilateral force, ensuring precise liquid level control.

[0077] In some embodiments, the speed monitor includes an infrared sensor 15 and a data processing unit; the infrared sensor 15 and the data processing unit are electrically connected to the processor respectively;

[0078] The number of the infrared sensors 15 is the same as the number of the compound enrichment modules 7; the transmitting end and the receiving end of each infrared sensor 15 are arranged on both sides of the liquid outlet path of the compound enrichment module 7, forming an optical path monitoring structure covering the liquid outlet path; the infrared sensor 15 is used to detect the light path blocking time of the compound enrichment module 7, and the data processing unit is configured to calculate the liquid outlet speed of the compound enrichment module 7 according to the light path blocking time; the processor is configured to:

[0079] Based on the preset pressure-liquid discharge speed mapping relationship, the current remaining capacity of the compound enrichment module 7 is judged according to the liquid discharge speed; based on the current remaining capacity of the compound enrichment module 7, the enrichment capacity of the compound enrichment module 7 for the remaining sample in the sample storage bottle 1 is calculated, and it is judged whether it is necessary to connect other compound enrichment modules 7 for collaborative enrichment. It can be understood that the speed monitor, through the linkage of the infrared sensor 15 and the data processing unit, uses the light path blocking time to accurately calculate the liquid discharge speed of each compound enrichment module 7, and combines the preset pressure-speed mapping relationship to judge the remaining adsorption capacity of the compound enrichment module 7 in real time. This design enables the processor to predict the risk of column overload in advance, automatically trigger multi-column collaborative enrichment, avoid the leakage of perfluorinated compounds due to the adsorption saturation of a single column, and fundamentally solve the problem of low detection data in traditional technology.

[0080] In some embodiments, the tank body 301 is an open structure at the upper end;

[0081] The cover 302 is detachably connected to the open end of the bin body 301 through a press-fit assembly;

[0082] The pressing assembly includes an eccentric pressing part 4, and the eccentric pressing part 4 includes an operating handle 401 and an eccentric cam 402;

[0083] Among them, the eccentric cam 402 is rotatably mounted on the upper side of the cover body 302 via the pivot shaft 5; and when the operating handle 401 drives the eccentric cam 402 to rotate around the pivot shaft 5, the radial change of the cam profile of the eccentric cam 402 causes a compressed sealed state or a separated unlocked state to be formed between the cover body 302 and the open end of the warehouse body 301. It is understandable that the warehouse body 301 and the cover body 302 are connected by the eccentric pressing member 4. When the operating handle 401 drives the eccentric cam 402 to rotate, the radial change of the cam profile is used to achieve a compressed sealed state or a separated unlocked state between the cover body 302 and the warehouse body 301. This design abandons the traditional bolt fastening method, greatly shortens the operation time of replacing the compound enrichment module 7 in the field, ensures the sealing of the negative pressure environment of the warehouse body 301, and greatly improves the convenience of equipment maintenance.

[0084] In some embodiments, the press-fit assembly further includes a guide rod 16 that defines the linear motion path of the cover 302. The guide rod 16 extends through the cover 302 and is located outside the chamber 301. It will be appreciated that the guide rod 16 in the press-fit assembly extends through the cover 302 and defines its linear motion path, preventing the cover 302 from shifting or tilting during eccentric press-fit. This design reduces the fit error between the sealing surfaces of the cover 302 and the open end of the chamber 301, preventing negative pressure leakage caused by installation deviations, ensuring stable pressure during the enrichment process, and thereby guaranteeing consistent perfluorinated compound adsorption efficiency.

[0085] In some embodiments, the pressing assembly further comprises an elastic element, which acts on the cover 302. When in the separated and unlocked state, the elastic force of the elastic element overcomes the weight of the cover 302, separating the cover 302 from the chamber 301. One end of the elastic element acts on the cover 302, and the other end is fixed to the guide rod 16. The elastic force of the elastic element is in the opposite direction of the weight of the cover 302. When in the separated and unlocked state, the restoring force of the elastic element drives the cover 302 away from the chamber 301, thereby separating the cover 302 from the chamber 301. It is understood that in the unlocked state, the elastic element overcomes the weight of the cover 302 through its elastic force, automatically separating the cover 302 from the chamber 301 without the need for manual lifting. This design is particularly suitable for outdoor use when wearing protective gloves. The operator only needs to rotate the eccentric pressing member 4 to open the cover 302, reducing repeated mechanical movements.

[0086] In some embodiments, the chamber 301 is rectangular with an open top. There are four guide rods 16, each located outside the four corners of the chamber 301. The elastic element comprises four first helical compression springs 17, each mounted on one of the four guide rods 16. The axes of the first helical compression springs 17 are parallel to the trajectory of the cover 302, and the pre-compression of the first helical compression springs 17 is greater than the deformation caused by the weight of the cover 302. It is understood that using first helical compression springs 17 with a pre-compression greater than the weight of the cover 302 as the elastic element ensures that sufficient restoring force is provided to drive the cover 302 apart under all operating conditions (such as when the device is tilted or vibrating). This design avoids the problem of the cover 302 becoming stuck due to fatigue or uneven force in conventional elastic structures, ensuring that the cover 302 remains open smoothly even after continuous field operation.

[0087] In some embodiments, a sealing groove is provided circumferentially at the open end of the chamber body 301, and an elastic sealing ring 34 is embedded at the bottom of the cover body 302, which is an interference fit with the sealing groove. It is understood that the design of the elastic sealing ring 34, which is an interference fit between the sealing groove at the open end of the chamber body 301 and the bottom of the cover body 302, can form a tight sealing structure when the cover body 302 is connected to the chamber body 301. This design can effectively prevent air from entering the enrichment chamber body 3 when the negative pressure drive component is working, avoid insufficient negative pressure caused by leakage of the chamber body 301, ensure that the water sample can pass through the compound enrichment module 7 at a stable flow rate during the target compound enrichment process, and ensure the reliability of the perfluorinated compound adsorption effect.

[0088] In some embodiments, the sampling device further includes a cleaning and draining pipeline 18 connected to the liquid outlet pipe 2 via a three-way valve 20 for discharging the cleaning liquid;

[0089] Each of the sample inlets of the compound enrichment modules 7 is connected to a sample branch pipe 19;

[0090] Each sampling branch 19 is connected to the liquid outlet pipe 2 of the sample storage bottle 1 through a three-way valve 20;

[0091] The three-way valve 20 is electrically connected to the processor; the three-way valve 20 is configured as follows:

[0092] (a) enabling the liquid outlet pipe 2 to be selectively connected to or disconnected from the sample inlet of any one of the compound enrichment modules 7;

[0093] (b) The liquid outlet pipe 2 can be selectively connected or disconnected with the cleaning and drain line 18. It is understood that the configuration of the cleaning and drain line 18 and the three-way valve 20 allows for targeted cleaning of the relevant lines by controlling the flow of cleaning liquid through the three-way valve 20 before and after use of different compound enrichment modules 7. This design effectively removes residual perfluorinated compounds and other impurities, prevents cross-contamination, facilitates rapid switching between different detection tasks, and improves field operation efficiency. For example, when the compound enrichment module 7 is used for enrichment, the three-way valve 20 is controlled to connect the liquid outlet pipe 2 with at least one compound enrichment module 7, and the three-way valve 20 in the cleaning and draining pipeline 18 is controlled to be in a closed state. During cleaning, the three-way valve 20 is controlled to connect the liquid outlet pipe 2 with the cleaning and draining pipeline 18, and the three-way valve 20 in the pipeline to be cleaned is controlled to be in an open state, so that the cleaning liquid can enter the pipeline to be cleaned for cleaning, and the cleaning liquid can be discharged from the cleaning and draining pipeline 18. When the compound enrichment module 7 is not used for enrichment, the connection between the liquid outlet pipe 2 and the compound enrichment module 7 is cut off, and the connection between the liquid outlet pipe 2 and the cleaning pipeline is also cut off. Alternatively, the three-way valve 20 is controlled to selectively connect to the cleaning and draining pipeline 18 and the compound enrichment module 7; that is, it is connected to at least one of them, and the closure is achieved through the cleaning liquid discharge valve.

[0094] In some embodiments, each compound enrichment module 7 is provided with an enrichment marker light on its outer wall, and the enrichment marker light is electrically connected to a processor; the processor is configured as follows:

[0095] (a) Controlling the linkage action of the enrichment marker light and the corresponding three-way valve 20 according to the preset grouping logic;

[0096] (b) When samples undergo multi-stage enrichment through two or more compound enrichment modules 7, the enrichment marker lights on all compound enrichment modules 7 through which the same group of samples passes are illuminated, creating a visual identifier with color or coding characteristics to distinguish them from the compound enrichment modules 7 through which other samples pass. It will be understood that the enrichment marker lights on the outer walls of the compound enrichment modules 7 are linked to the processor. When multi-stage enrichment is performed, the processor illuminates the enrichment marker lights on all the samples passing through, creating a visual identifier with color or coding characteristics. This visual management approach helps operators quickly distinguish different samples within complex sample processing workflows, avoids sample confusion, and improves the accuracy of test results and the standardization of operations.

[0097] In some embodiments, the color or coding feature includes at least one of the following:

[0098] (a) Light sources with different color combinations; (b) Flashing codes based on a preset frequency; (c) Light patterns with specific arrangements and combinations. Of course, the color or coding features are not limited to the structures disclosed in this application; any feature that can distinguish different samples is sufficient. This application is for illustrative purposes only.

[0099] In some embodiments, the sample collection module further includes a sample collection assembly, comprising: a collection head 22 having a liquid collection end and a liquid outlet end, the liquid collection end being provided with a support leg 23 for suspending the liquid collection end; a collection tube 24, one end of which is connected to the liquid outlet end of the collection head 22 and the other end of which is connected to the liquid inlet of the sample storage bottle 1; and a sampling suction pump 36, which is connected to the collection tube 24 and electrically connected to the processor. It will be appreciated that in the sample collection assembly, the liquid collection end of the collection head 22 is suspended by the support leg 23 to prevent clogging of the liquid collection port by sediment, debris, etc., thereby ensuring smooth water sample collection. The collection tube 24 connects the various components to form a complete water sample transmission channel, enabling stable transfer from field water to the sample storage bottle 1, providing a reliable sample base for subsequent perfluorinated compound enrichment.

[0100] In some embodiments, the collection head 22 is equipped with a counterweight 31. It is understood that the counterweight 31 installed on the collection head 22 can increase the gravity of the collection head 22, making it easier for the collection head 22 to sink to the target depth during water sampling, thereby preventing the collection position from shifting due to factors such as water flow and buoyancy. Furthermore, the counterweight 31 can enhance the stability of the collection head 22, reduce shaking in complex water flow environments, ensure the accuracy and consistency of the water sample collection position, and thus improve the reliability of perfluorinated compound detection samples. This is particularly suitable for field water sampling scenarios in complex environments such as deep water and rapids.

[0101] In some embodiments, the sampling device further includes a valve body box 32, on which the three-way valves 20 are mounted, and the valve body box 32 is fixedly mounted above the mounting box 10; the eccentric pressing member 4 is rotatably mounted below the valve body box 32; and the sampling branch pipes 19 all pass through the cover 302 and are sealed to the cover 302. It is understandable that the valve body box 32 centrally mounts the three-way valves 20, realizing the integration of flow control components and facilitating unified management and maintenance; its layout of being fixed above the mounting box 10 and the eccentric cam 402 mounted below, combined with the sealing design of the sampling branch pipe 19 passing through the cover 302, makes the various components compact and orderly connected, saving equipment space and ensuring the sealing of the negative pressure system; at the same time, this structural design makes the equipment more stable during field transportation and operation, reducing the risk of failure due to loose components.

[0102] In some embodiments, the eccentric pressing parts 4 are provided in two groups, one at each end of the cover 302. The pivot shaft 5 is connected to the lower side of the valve box 32 via two connecting ears 33. The valve box 32 is fixedly mounted on the top of the mounting box 10 via a mounting plate.

[0103] In some embodiments, the negative pressure generating device is a vacuum pump 26; the sampling and suction pump 36 and the vacuum pump 26 are both located within the mounting box 10. It will be appreciated that the vacuum pump 26, acting as the negative pressure generating device and being located together with the sampling and suction pump 36 within the mounting box 10, achieves an integrated layout of the power components. This design effectively reduces external piping connections, lowering the risk of damage due to exposed piping. It also makes the overall structure more compact, facilitating equipment handling and storage during field operations, and enhancing the device's portability and stability.

[0104] In some embodiments, the chamber body 301 is provided with a transparent area for observing the enrichment status of the compound enrichment module 7. It is understood that the transparent area provided on the chamber body 301 enables the operator to directly observe the enrichment status within the compound enrichment module 7, such as liquid flow and packing color changes, without opening the chamber body 301. This allows the operator to visually determine whether the enrichment process is normal and promptly detect abnormalities (such as blockage or liquid leakage in the compound enrichment module 7), facilitating the rapid implementation of countermeasures and ensuring the smooth progress of perfluorinated compound enrichment. Of course, the transparent area can be the entire housing of the chamber body 301 or simply an area through which the enrichment status of the compound enrichment module 7 can be observed.

[0105] In some embodiments, the compound enrichment module 7 is mounted in the chamber 301 via a detachable first support plate 25. The first support plate 25 is provided with a first limiting hole adapted to the compound enrichment module 7, for defining the vertical position of the compound enrichment module 7. Exemplarily, the first support plate 25 can be mounted using a snap-fit ​​connection, although other detachable connection methods may also be used.

[0106] In some embodiments, the eluent collecting container 8 is installed in the warehouse body 301 through a detachable second support plate 28 and is located directly below the compound enrichment module 7. The second support plate 28 is provided with a second limiting hole 29 for limiting the position of the eluent collecting container 8. Exemplarily, the installation of the second support plate 28 can be achieved by snap-fitting, and of course other detachable connection methods can also be used. It is understandable that the eluent collecting container 8 is detachably installed in the warehouse body 301 through the second support plate 28, and is precisely positioned directly below the compound enrichment module 7 using the second limiting hole 29 to ensure that when the target compound is eluted, the eluent can accurately flow into the eluent collecting container 8 to avoid liquid spillage or misplacement during the collection process. This standardized installation method not only facilitates the rapid replacement and transfer of the eluent collecting container 8, but also maintains its stable position during the enrichment process, thereby improving the reliability and efficiency of eluent collection.

[0107] In some embodiments, the sample collection modules are provided in two groups. It is understood that the design of two groups of sample collection modules equipped with two main containers enables simultaneous sampling of water bodies in two similar locations. Compared with the traditional single-shot single-point sampling method, this design significantly improves sampling efficiency, allowing data from multiple points to be acquired in a shorter time, reducing field work time. Simultaneously collected samples facilitate comparative analysis, more accurately reflecting the distribution characteristics and concentration differences of perfluorinated compounds in regional water bodies, and providing more comprehensive and reliable data support for environmental monitoring.

[0108] In some embodiments, the waste liquid discharge channel includes a waste liquid discharge pipe 21 and a drain valve 6 connected to the waste liquid discharge pipe 21, and the drain valve 6 is electrically connected to the processor.

[0109] In some embodiments, each pipeline in the sampling device, the sample storage bottle 1, the shell of the compound enrichment module 7, and the eluent collection container 8 are all made of PE material.

[0110] In some embodiments, the processor is a PLC.

[0111] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0112] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0113] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A sampling device for perfluorinated water, characterized in that: include: a sample collection module, comprising a sample storage bottle for storing a water sample; A compound enrichment assembly comprising at least two compound enrichment modules, each of which is selectively connected to the sample storage bottle, and the water sample in the sample storage bottle can flow into the compound enrichment module currently connected to the sample storage bottle; A monitoring component, including a speed monitor for monitoring the liquid output speed of each compound enrichment module; A processor is connected to the monitoring component and is used to receive monitoring data from the monitoring component and determine a current enrichment amount of the compound enrichment module currently connected to the sample storage bottle based on the monitoring data.

2. The sampling device for perfluorinated water according to claim 1, characterized in that: The monitoring component also includes: a first liquid level detection component, the first liquid level detection component being used to obtain first liquid level data, the first liquid level data being the liquid level height in the sample storage bottle; a second liquid level detection component, the second liquid level detection component being used to obtain second liquid level data, the second liquid level data being the liquid level height in the compound enrichment module; The processor determines the maximum processed water sample volume based on the first liquid level data, the second liquid level data, the current enrichment amount and the current maximum enrichment amount of the compound enrichment module. The maximum processed water sample volume is the maximum volume of the current water sample that the current compound enrichment module can process.

3. The sampling device for perfluorinated water according to claim 2, characterized in that: The sampling device also includes a warning module; The first liquid level detection component is further used to obtain third liquid level data, where the third liquid level data is initial liquid level data in the sample storage bottle; The processor is connected to the warning module, and is also used to determine the volume of the water sample discharged from the sample storage bottle based on the third liquid level data and the first liquid level data; and when the volume of the water sample discharged from the sample storage bottle is equal to 80%-100% of the maximum processed water sample volume, control the warning module to issue a warning message.

4. The sampling device for perfluorinated water according to claim 1, characterized in that: The speed monitor includes an infrared sensor and a data processing unit; the infrared sensor and the data processing unit are electrically connected to the processor respectively; wherein the number of the infrared sensors is the same as the number of the compound enrichment modules; the transmitting end and the receiving end of each infrared sensor are relatively arranged on both sides of the liquid outlet path of the compound enrichment module, forming an optical path monitoring structure covering the liquid outlet path; the infrared sensor is used to detect the optical path blocking time of the compound enrichment module, and the data processing unit is configured to calculate the liquid outlet speed of the compound enrichment module based on the optical path blocking time.

5. The sampling device for perfluorinated water according to claim 1, characterized in that: The sampling device further comprises a height control component, which is used to dynamically compensate for the displacement of the sample storage bottle caused by the flow of the sample, so that the height between the sample liquid level in the sample storage bottle and the horizontal plane remains constant.

6. The sampling device for perfluorinated water according to claim 5, characterized in that: The height control assembly includes: Install a table to fix and carry sample storage bottles; Install a guide column that vertically penetrates the installation platform to form a sliding guide structure; The elastic support unit is provided on the lower side of the mounting plate, and its elastic deformation is adapted to the mass of the sample in the sample storage bottle; Among them, the elastic force adjustment mechanism of the elastic support unit is configured as follows: during the enrichment process of the target compound, through the guiding effect of the installed guide column, the displacement of the sample storage bottle caused by the sample flow is dynamically compensated, so that the height between the sample liquid level in the sample storage bottle and the horizontal plane remains constant.

7. The sampling device for perfluorinated water according to claim 1, characterized in that: The compound enrichment component includes an enrichment bin and a waste liquid discharge channel arranged at the bottom of the enrichment bin, and the compound enrichment module is arranged in the enrichment bin; the enrichment bin includes a bin having at least one open end and a cover body adapted to the open end of the bin body, and the cover body is detachably and sealedly connected to the open end of the bin body.

8. The sampling device for perfluorinated water according to claim 7, characterized in that: The sampling device further comprises an eluent collecting container for collecting the eluent, and the eluent collecting container is detachably mounted in the tank body; And / or, the sampling device further comprises a mounting box with a hollow structure; the chamber body and the sample storage bottle are both mounted on the upper side of the mounting box; a guide rail is provided on the upper surface of the mounting box, and a slider is provided on the bottom surface of the chamber body for slidingly engaging with the guide rail; when the cover body is separated from the chamber body, the chamber body can be moved relative to the mounting box along the guide rail by the slider; And / or, the sampling device further comprises a cleaning drainage pipeline connected to the liquid outlet pipe of the sample storage bottle through a three-way valve, for discharging the cleaning liquid; the sampling port of each compound enrichment module is connected to an injection branch pipe; each injection branch pipe is connected to the liquid outlet pipe of the sample storage bottle through a three-way valve; the three-way valve is electrically connected to the processor; And / or, the bin body is an open-top structure; the cover body is detachably connected to the open end of the bin body by a pressing assembly; the pressing assembly includes an eccentric pressing member, and the eccentric pressing member includes an operating handle and an eccentric cam; wherein the eccentric cam is rotatably mounted on the upper side of the cover body via a pivot shaft; and when the operating handle drives the eccentric cam to rotate about the pivot shaft, the radial change of the cam profile of the eccentric cam causes a compressed sealed state or a separated unlocked state to be formed between the cover body and the open end of the bin body; And / or, the sample collection module further includes a sample collection assembly, the sample collection assembly including: a collection head, the collection head having a liquid collection end and a liquid outlet end, the collection head being equipped with a counterweight, and the liquid collection end thereof being provided with a support foot for suspending the liquid collection end; a collection tube, one end of the collection tube being connected to the liquid outlet end of the collection head, and the other end of the collection tube being connected to the liquid inlet of the sample storage bottle; a sampling suction pump, the sampling suction pump being connected to the collection tube, and the sampling suction pump being electrically connected to the processor; And / or, an outer wall of each compound enrichment module is provided with an enrichment marker light, and the enrichment marker light is electrically connected to the processor.

9. The sampling device for perfluorinated water according to claim 8, characterized in that: The pressing assembly further includes a guide rod that defines a linear motion path of the cover body, wherein the guide rod is disposed through the cover body and is located outside the bin body; And / or, the pressing assembly further comprises an elastic element, the elastic element acting on the cover body, and in the separated and unlocked state, the elastic force of the elastic element overcomes the gravity of the cover body, so that the cover body is separated from the bin body; one end of the elastic element acts on the cover body, and the other end is fixed to the guide rod, and the direction of the elastic force of the elastic element is opposite to the direction of the gravity of the cover; in the separated and unlocked state, the restoring force of the elastic element drives the cover body to move in a direction away from the bin body, thereby achieving separation of the cover body and the bin body; And / or, a sealing groove is provided circumferentially at the open end of the bin body, and an elastic sealing ring is embedded in the bottom of the cover body and is interference-fitted with the sealing groove; And / or, the sampling device further comprises a valve body box, the three-way valves are all mounted on the valve body box, and the valve body box is fixedly mounted above the mounting box; the eccentric pressing member is rotatably mounted below the valve body box; the sampling branch pipes all pass through the cover body and are sealed to the cover body; And / or, the chamber body is provided with a transparent area for observing the enrichment status of the compound enrichment module; And / or, the pipes, sample storage bottles, housing of the compound enrichment module and eluent collection container in the sampling device are all made of PE material; And / or, the processor is a PLC.

10. The sampling device for perfluorinated water according to any one of claims 1 to 9, characterized in that: The method for sampling using the sampling device comprises the following steps: S10, injecting perfluorinated contaminated water into the sample storage bottle of the sample collection module; S20, the processor controls the sample storage bottle to be connected to the liquid inlet end of at least one compound enrichment module to enrich the target compound; S30. Monitor the liquid outlet speed of the selected sample collection module in real time through a speed monitor, and determine the current enrichment amount of the compound enrichment module currently connected to the sample storage bottle based on the monitored liquid outlet speed data. When the current enrichment amount reaches a preset value, replace the compound enrichment component.

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