In-situ detection device and method for heavy metals in mangrove forest sediment pore water

Abstract

The invention relates to an in-situ detection device for heavy metals in mangrove forest sediment pore water, which comprises a support frame body, a sampling mechanism comprises a sampling cylinder, a piston is coaxially arranged in the sampling cylinder, and the bottom of the sampling cylinder is provided with a sample outlet provided with an electromagnetic valve and a sampling port provided with a one-way valve. The sampling port is connected with a sampling pipe with percolation sieve holes; the detection mechanism comprises a detection chamber, a plurality of groups of detection stations are arranged in the detection chamber, detection test paper release assemblies and detection test paper recovery assemblies are arranged on the detection stations, and liquid dropping branch pipes are arranged above the heavy metal detection test paper between the detection test paper release assemblies and the detection test paper recovery assemblies; the liquid dropping branch pipes are connected to the sample outlet; and the detection chamber is provided with a camera assembly at the top of the detection station. The sampling pipe is inserted into a specific position of the sediment, so that in-situ long-term monitoring of the heavy metal in the mangrove sediment pore water in the sediment is realized, disturbance to the sediment is avoided, and the accuracy of a measurement result is ensured.

Description

Technical Field

[0001] The invention relates to an in-situ detection device for heavy metals in mangrove sediment pore water and a method thereof, belonging to the technical field of mangrove pore water detection. Background Art

[0002] Mangroves are important coastal ecosystems, rich in biodiversity and providing numerous ecological services. Heavy metal pollution in mangrove sediment pore water may originate from a variety of human activities, including industrial wastewater discharge, agricultural activities, marine aquaculture, and shipping. By measuring the heavy metal content and distribution characteristics in sediment pore water, we can trace the source of pollution and provide a scientific basis for pollution control. Heavy metal content can directly reflect the health of mangrove ecosystems. By testing heavy metal pollution indicators, we can identify potential pollution risks in sediments, quantify the long-term impact of human activities on mangrove ecosystems, assess the health of the entire ecosystem, and provide data support for the development of sustainable management strategies.

[0003] In the existing technology, the detection of heavy metals in sediment pore water generally adopts a columnar sediment sampler to collect sediment, and then obtains pore water by centrifugation, squeeze filtration, vacuum filtration and other methods, and finally uses large laboratory instruments such as inductively coupled plasma mass spectrometer and atomic absorption spectrometer for analysis and testing. During the sampling process, after completing one sampling, the sampler needs to pull out the sampling mechanism and re-enter the sediment when sampling again. It is impossible to perform long-term multiple sampling at the same point, and the sampling efficiency is low. When entering the sediment again, it will cause disturbance to the sediment, reducing the purity of the collected sample. After sampling, the sediment needs to be brought back to the laboratory for processing and analysis. The laboratory heavy metal analysis operation steps are cumbersome and time-consuming, and the operation process has high quality control requirements. The transportation process and laboratory analysis process are prone to introduce foreign heavy metal elements, affecting the accuracy of the measurement results. In addition, if you want to obtain long-term monitoring data, you need to go to the mangrove site for multiple sampling, and the sampling personnel have a large workload.

[0004] Therefore, how to solve the problem of in-situ long-term monitoring of heavy metals in mangrove sediment pore water in the existing technology and obtain detection data in a timely manner has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an in-situ detection device and method for heavy metals in mangrove sediment pore water.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: an in-situ detection device for heavy metals in mangrove sediment pore water, comprising a support frame, on which a sampling mechanism and a detection mechanism are provided; The sampling mechanism includes a sampling cylinder, wherein a piston is coaxially arranged inside the sampling cylinder and is electrically driven to perform axial reciprocating sliding. The bottom of the sampling cylinder is provided with a sample outlet equipped with a solenoid valve and a sampling port equipped with a one-way valve, and the sampling port is connected to a sampling tube with a percolation sieve hole; The detection mechanism includes a detection chamber, in which a plurality of detection stations are provided. Each of the detection stations is provided with a test paper release assembly and a test paper recovery assembly. A drip branch is provided above the heavy metal test paper between the test paper release assembly and the test paper recovery assembly. Each of the drip branch pipes is connected to a sample outlet, and the liquid volume is controlled by a solenoid valve. The detection chamber is provided with a camera assembly at the top of the detection station and a waste liquid recovery assembly at the bottom.

[0007] Preferably, the solenoid valve is a flow control valve.

[0008] Preferably, a plurality of fine filtration sieve holes are distributed on the circumference of the sampling tube.

[0009] Preferably, the sampling tube is coaxially composed of an upper sampling tube and a lower sampling tube, the bottom end of the upper sampling tube and the top end of the lower sampling tube are screwed together by internal and external threads, and a sealing ring is also provided between the bottom end of the upper sampling tube and the top end of the lower sampling tube, and the bottom end of the lower sampling tube is a sharp spike with the tip facing downward.

[0010] Preferably, the test paper releasing components include a unwinding roller with a groove on its periphery, and the test paper recovering components include a winding roller with a groove on its periphery that is driven to rotate by a motor, the unwinding roller is wound with a waterproof paper tape, heavy metal detection test papers are pasted on the paper tape at equal intervals, and the other end of the paper tape is wound by a winding roller; the heavy metal detection objects of the heavy metal detection papers between the detection stations are different.

[0011] Preferably, several groups of inspection stations are evenly distributed around the circumference of the inspection chamber, and each inspection station is provided with a station partition plate to facilitate separation of adjacent inspection stations.

[0012] Preferably, the dripping branch pipes are first connected to the dripping main pipe, and the dripping main pipe is then connected to the sample outlet.

[0013] Preferably, the waste liquid recovery component includes a detection cavity bottom of the detection chamber, the detection cavity bottom is high on all sides and low in the middle, and a recovery pipe is connected in the middle, and the recovery pipe is connected to the waste liquid bag.

[0014] Preferably, the detection chamber is arranged inside the inner shell, and an outer shell is arranged outside the inner shell. The test paper release components are all arranged in the cavity between the inner and outer shells, the test paper recovery components are all arranged in the detection chamber, and the paper tapes pass through the tape threading groove on the peripheral wall of the inner shell.

[0015] A method for detecting heavy metals in mangrove sediment pore water by an in-situ detection device comprises the following steps: S1: Insert the sampling tube into the sediment, the piston moves upward, the one-way valve opens, and the pore water enters the sampling tube through the percolation sieve holes under the action of negative pressure; S2: After the sampling cylinder is filled with a predetermined amount of pore water, the piston moves downward, and the pore water is output through the dripping main pipe. The solenoid valve controls the water volume, and the pore water is output through all dripping branches. The pipeline is cleaned to prevent the water sample collected last time from remaining in the dripping main and branch pipes. The waste water after cleaning the pipeline is input into the waste liquid bag; S3: The camera assembly is turned on, and the winding roller rotates, driving the unwinding roller to rotate at the same time. A heavy metal detection test paper from each detection station enters the detection chamber and stops directly under the corresponding drip branch. The winding roller stops rotating, and the piston starts to move downward again. The solenoid valve controls a small amount of pore water to drip onto the heavy metal detection test paper from all drip branches. After the heavy metal detection paper reacts with the pore water to develop color, the camera assembly takes a photo and transmits the photo to the control module. The control module compares the color depth with the standard color scale card, converts the compared test results into specific concentration values, and records them. S4: After the single heavy metal concentration detection and analysis is completed, the remaining pore water in the sampling tube continues to be input into the detection chamber through the dripping main pipe and discharged into the waste liquid bag through the dripping branch pipe. The control module turns off the camera assembly; S5: When collecting and testing pore water from mangrove sediments next time, the control module controls the winding roller to rotate and drives the unwinding roller to rotate simultaneously. The heavy metal detection paper tested last time is wound into the winding roller for recycling. The new heavy metal detection paper runs to the bottom of the corresponding drip branch pipe to wait for testing. The process of extracting pore water in step S1 and testing in step S4 is repeated. S6: Through the setting of the control module, the contents of multiple heavy metals in the pore water are collected and tested once a day at low tide, realizing long-term monitoring of multiple heavy metal elements in the pore water of mangrove sediments.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting the percolation sieve holes in the sampling tube, the particulate pollutants in the pore water can be filtered; 2. Prevent pore water from flowing back out of the sampling tube by installing a one-way valve at the sampling port; 3. The sample outlet equipped with a solenoid valve can control the amount of water dripping onto the heavy metal test paper on the one hand, and the flow rate of the liquid discharged to waste liquid recovery after testing on the other hand; 4. Through several groups of testing stations, each sampling can simultaneously measure the heavy metal content of multiple different indicators; 5. By inserting the sampling tube into a specific location in the sediment, in-situ long-term monitoring of heavy metals in the pore water of mangrove sediments is achieved without disturbing the sediment, ensuring the accuracy of the measurement results.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the sampling mechanism.

[0020] Figure 3 Schematic diagram of the partial explosion of the sampling mechanism.

[0021] Figure 4 It is a top sectional view of the detection mechanism.

[0022] Figure 5 This is the main sectional view of the detection mechanism.

[0023] In the figure: sampling cylinder 1, piston 2, solenoid valve 3, one-way valve 4, detection chamber 5, heavy metal detection test paper 6, drip branch pipe 7, camera assembly 8, lighting assembly 9, percolation sieve hole 10, upper sampling tube 11, lower sampling tube 12, O-ring 13, spike 14, unwinding roller 15, winding roller 16, paper tape 17, workstation partition 18, drip main pipe 19, detection chamber bottom 20, recovery tube 21, waste liquid bag 22, inner shell 23, outer shell 24, inner top cover 25, outer top cover 26, switch door 27, bottom plate 28, support column 29, protective cover 30, electric push rod 31. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] like Figures 1 to 5 As shown, this embodiment provides an in-situ detection device for heavy metals in mangrove sediment pore water, including a support frame, on which a sampling mechanism and a detection mechanism are provided; The sampling mechanism includes a sampling cylinder 1, wherein a piston 2 is coaxially arranged inside the sampling cylinder and is electrically driven to perform axial reciprocating sliding. The bottom of the sampling cylinder is provided with a sample outlet equipped with a solenoid valve 3 and a sampling port equipped with a one-way valve 4. The sampling port is connected to a sampling tube with a percolation sieve hole. The piston is driven by the electric push rod 31 to slide back and forth in the axial direction.

[0028] The detection mechanism includes a detection chamber 5, in which six groups of detection stations are provided. Each of the detection stations is provided with a detection test paper release component and a detection test paper recovery component. A drip branch 7 is provided above the heavy metal detection paper 6 between the detection test paper release component and the detection test paper recovery component. The drip branch is connected to the sample outlet and the liquid volume is controlled by a solenoid valve. The detection chamber is provided with a camera assembly 8 and a lighting assembly 9 at the top of the detection station, and a waste liquid recovery assembly at the bottom.

[0029] In the embodiment of the present invention, the solenoid valve is a flow control valve.

[0030] In the embodiment of the present invention, a plurality of fine filtration sieve holes 10 are distributed on the circumference of the sampling tube.

[0031] In an embodiment of the present invention, the sampling tube is coaxially composed of an upper sampling tube 11 and a lower sampling tube 12. The bottom end of the upper sampling tube and the top end of the lower sampling tube are screwed together by internal and external threads, and an O-ring 13 is also provided between the bottom end of the upper sampling tube and the top end of the lower sampling tube. The bottom end of the lower sampling tube is a spike 14 with the tip facing downward.

[0032] In an embodiment of the present invention, the test paper releasing components all include a unwinding roller 15 with a groove on the periphery, and the test paper recycling components all include a winding roller 16 with a groove on the periphery that is driven to rotate by a motor, and the unwinding rollers are all wound with waterproof paper tapes 17, such as PVC base paper, and heavy metal test papers are pasted on the paper tapes at equal intervals, and the other end of the paper tapes is wound by a winding roller; the heavy metal detection objects of the heavy metal detection papers between the detection stations are different.

[0033] In the embodiment of the present invention, the height of the unwinding roller is slightly higher than that of the rewinding roller, so that the paper strip is slightly higher on the outside and lower on the inside, so as to prevent liquid from flowing to the outside and contaminating the new heavy metal detection test paper.

[0034] In the embodiment of the present invention, six groups of inspection stations are evenly distributed around the circumference of the inspection chamber, and each inspection station is provided with a station partition plate 18 to facilitate separation of adjacent inspection stations.

[0035] The six groups of inspection stations are numbered 1 to 6, and the camera components therein are also numbered 1 to 6.

[0036] In the embodiment of the present invention, the dripping branch pipes are first connected to the dripping main pipe 19, and the dripping main pipe is then connected to the sample outlet.

[0037] In an embodiment of the present invention, the waste liquid recovery component includes a detection chamber bottom 20 of the detection chamber, the detection chamber bottom is high on all sides and low in the middle, and a recovery pipe 21 is connected in the middle, and the recovery pipe is connected to a waste liquid bag 22, which is detachable and easy to replace.

[0038] In an embodiment of the present invention, the detection chamber is arranged inside the inner shell 23, and an outer shell 24 is arranged outside the inner shell. The test paper release components are all arranged in the cavity between the inner and outer shells, and the test paper recovery components are all arranged in the detection chamber. The paper tapes all pass through the tape threading groove on the peripheral wall of the inner shell.

[0039] In an embodiment of the present invention, the top of the inner shell body has an inner top cover 25 that can be opened and closed, the top of the outer shell body has an outer top cover 26 that can be opened and closed, and the periphery of the outer shell body is provided with an openable and closeable door 27 at the position corresponding to each unwinding roller, so as to facilitate the inspection and replacement of the paper tape.

[0040] In an embodiment of the present invention, the camera assembly and the lighting assembly are located at the inner top of the inner shell, the camera assembly includes cameras arranged in a one-to-one correspondence above the heavy metal detection test paper of the droplet, and the lighting assembly is a lighting lamp.

[0041] In an embodiment of the present invention, a battery is provided on the support frame to supply power to all electrical devices.

[0042] In this embodiment of the present invention, the support frame is made of polytetrafluoroethylene and includes a base plate 28. A plurality of vertical support columns 29 are fixed to the bottom surface of the base plate. These columns can be firmly inserted into the sediment, ensuring stability during the sampling process and protecting the device from tidal currents. The sampling and detection mechanisms are mounted on the top surface of the base plate. A protective cover 30 is provided on the top surface of the base plate to enclose the sampling and detection mechanisms. The protective cover is screwed to the base plate.

[0043] In an embodiment of the present invention, the sampling tube extends to a position below the bottom plate.

[0044] A method for detecting heavy metals in mangrove sediment pore water by an in-situ detection device comprises the following steps: S1: The support column is firmly inserted into the sediment to keep the device stable during the sampling process. The sampling tube is inserted into the sediment, the piston moves upward, the one-way valve opens, and the pore water enters the sampling tube through the percolation sieve holes under the action of negative pressure; S2: After the sampling cylinder is filled with a predetermined amount of pore water, the piston moves downward, and the pore water is output through the dripping main pipe. The solenoid valve controls the water volume, and the pore water is output through all dripping branches. The pipeline is cleaned to prevent the water sample collected last time from remaining in the dripping main and branch pipes. The waste water after cleaning the pipeline is input into the waste liquid bag; S3: The camera and lighting components are turned on, and the winding roller rotates, driving the unwinding roller to rotate at the same time. A heavy metal detection paper from each detection station enters the detection chamber and stops directly under the corresponding drip branch. The winding roller stops rotating, and the piston starts to move downward again. The solenoid valve controls a small amount of pore water to drip from all drip branches onto the six heavy metal detection papers of chromium, manganese, copper, zinc, mercury, and lead. After the heavy metal detection paper reacts with the pore water to develop color, the camera component takes a photo and transmits the photo to the control module. The control module compares the color depth with the standard color scale card, converts the compared test results into specific concentration values, and records them. S4: After the single heavy metal concentration detection and analysis is completed, the remaining pore water in the sampling tube continues to be input into the detection chamber through the dripping main pipe and discharged into the waste liquid bag through the dripping branch pipe to avoid environmental pollution; the control module turns off the camera and lighting components; S5: When collecting and testing pore water from mangrove sediments next time, the control module controls the winding roller to rotate and drives the unwinding roller to rotate simultaneously. The heavy metal detection paper tested last time is wound into the winding roller for recycling. The new heavy metal detection paper runs to the bottom of the corresponding drip branch pipe to wait for testing. The process of extracting pore water in step S1 and testing in step S4 is repeated. S6: Through the setting of the control module, the contents of six heavy metals in the pore water are collected and tested once every day at low tide, realizing long-term monitoring of the six heavy metal elements in the pore water of mangrove sediments.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. An in-situ detection device for heavy metals in mangrove sediment pore water, characterized by: It includes a support frame, on which a sampling mechanism and a detection mechanism are provided; The sampling mechanism includes a sampling cylinder, wherein a piston is coaxially arranged inside the sampling cylinder and is electrically driven to perform axial reciprocating sliding. The bottom of the sampling cylinder is provided with a sample outlet equipped with a solenoid valve and a sampling port equipped with a one-way valve, and the sampling port is connected to a sampling tube with a percolation sieve hole; The detection mechanism includes a detection chamber, in which a plurality of detection stations are provided. Each of the detection stations is provided with a test paper release assembly and a test paper recovery assembly. A drip branch is provided above the heavy metal test paper between the test paper release assembly and the test paper recovery assembly. Each of the drip branch pipes is connected to a sample outlet, and the liquid volume is controlled by a solenoid valve. The detection chamber is provided with a camera assembly at the top of the detection station and a waste liquid recovery assembly at the bottom.

2. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: The solenoid valve is a flow control valve.

3. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: A plurality of fine filtration sieve holes are distributed on the periphery of the sampling tube.

4. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: The sampling tube is composed of an upper sampling tube and a lower sampling tube which are coaxial. The bottom end of the upper sampling tube and the top end of the lower sampling tube are screwed together by internal and external threads, and a sealing ring is provided between the bottom end of the upper sampling tube and the top end of the lower sampling tube. The bottom end of the lower sampling tube is a spike with the tip facing downward.

5. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: The test paper releasing components all include a unwinding roller with a wheel groove on the periphery, and the test paper recovering components all include a winding roller with a wheel groove on the periphery that is driven to rotate by a motor, and a waterproof paper tape is wound on the unwinding roller, and heavy metal test papers are pasted on the paper tape at equal intervals, and the other end of the paper tape is wound by a winding roller; the heavy metal detection objects of the heavy metal detection papers between the detection stations are different.

6. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: Several groups of inspection stations are evenly distributed around the circumference of the inspection chamber, and each inspection station is provided with a station partition plate to facilitate separation of adjacent inspection stations.

7. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: The dripping branch pipes are first connected to the dripping main pipe, and the dripping main pipe is then connected to the sample outlet.

8. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 1, characterized in that: The waste liquid recovery component comprises a detection cavity bottom of the detection chamber, the detection cavity bottom is high on all sides and low in the middle, and a recovery pipe is connected in the middle, and the recovery pipe is connected to the waste liquid bag.

9. The in-situ detection device for heavy metals in mangrove sediment pore water according to claim 5, characterized in that: The detection chamber is arranged inside the inner shell, and an outer shell is arranged outside the inner shell. The test paper releasing components are all arranged in the cavity between the inner and outer shells, the test paper recovery components are all arranged in the detection chamber, and the paper tapes pass through the tape threading groove on the peripheral wall of the inner shell.

10. A detection method for the in-situ detection device for heavy metals in mangrove sediment pore water according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Insert the sampling tube into the sediment, the piston moves upward, the one-way valve opens, and the pore water enters the sampling tube through the percolation sieve holes under the action of negative pressure; S2: After the sampling cylinder is filled with a predetermined amount of pore water, the piston moves downward, and the pore water is output through the dripping main pipe. The solenoid valve controls the water volume, and the pore water is output through all dripping branches. The pipeline is cleaned to prevent the water sample collected last time from remaining in the dripping main and branch pipes. The waste water after cleaning the pipeline is input into the waste liquid bag; S3: The camera assembly is turned on, and the winding roller rotates, driving the unwinding roller to rotate at the same time. A heavy metal detection test paper from each detection station enters the detection chamber and stops directly under the corresponding drip branch. The winding roller stops rotating, and the piston starts to move downward again. The solenoid valve controls a small amount of pore water to drip onto the heavy metal detection test paper from all drip branches. After the heavy metal detection paper reacts with the pore water to develop color, the camera assembly takes a photo and transmits the photo to the control module. The control module compares the color depth with the standard color scale card, converts the compared test results into specific concentration values, and records them. S4: After the single heavy metal concentration detection and analysis is completed, the remaining pore water in the sampling tube continues to be input into the detection chamber through the dripping main pipe and discharged into the waste liquid bag through the dripping branch pipe. The control module turns off the camera assembly; S5: When collecting and testing pore water from mangrove sediments next time, the control module controls the winding roller to rotate and drives the unwinding roller to rotate simultaneously. The heavy metal detection paper tested last time is wound into the winding roller for recycling. The new heavy metal detection paper runs to the bottom of the corresponding drip branch pipe to wait for testing. The process of extracting pore water in step S1 and testing in step S4 is repeated. S6: Through the setting of the control module, the contents of multiple heavy metals in the pore water are collected and tested once a day at low tide, realizing long-term monitoring of multiple heavy metal elements in the pore water of mangrove sediments.

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