An analytical device and method for analyzing soil pollutants used in environmental supervision.

Abstract

This invention discloses a soil pollutant analysis device for environmental monitoring, comprising: a sampling component including a movable support, a receiving platform mounted on the movable support, and a receiving vessel mounted on the receiving platform; a protective cover for protecting the receiving vessel is provided on the receiving platform; and a sampling component positioned between the movable support and the receiving platform; and an analysis component including a soil analysis module, a concentration detection analysis module, and an interval processing component disposed within the receiving vessel. The interval processing component performs simultaneous analysis on soil samples collected at different depths. The soil analysis module and the concentration detection analysis module perform simultaneous analysis on the soil. The analysis device is used to establish a detection model corresponding to the target pollutant based on the PXRF concentration and ICP-MS concentration of each of the M soil samples. The detection model reflects the mapping relationship between the ICP-MS concentration and the PXRF concentration.

Description

Technical Field

[0001] This invention relates to the technical field of soil pollutant detection, and in particular to a soil pollutant analysis device and analysis method for environmental supervision. Background Technology

[0002] Soil and groundwater pollution has become a global environmental problem, making the remediation and restoration of contaminated sites and the improvement of soil environmental quality an urgent priority. Currently, soil and groundwater pollution remediation faces significant challenges, primarily due to the irregular and heterogeneous spatial distribution of pollutants deep underground, which greatly complicates pollution detection and the delineation of pollution extent. The migration and distribution of pollutants in soil and groundwater are influenced not only by the characteristics of the pollution source but also by the spatial structural characteristics of the underlying medium (soil). Therefore, compared to the distribution of pollutants in surface water and the atmosphere, the spatial distribution characteristics of pollutants in soil and groundwater are far more complex.

[0003] One of the conventional methods for analyzing the distribution characteristics of pollutants in contaminated sites is geochemical exploration. The basic principle is to collect contaminated soil samples from different spatial locations through drilling, then analyze the pollutant concentrations in the soil in a laboratory, and finally obtain the spatial distribution characteristics of the pollutant concentrations through spatial interpolation. Therefore, the accuracy of the pollutant concentration distribution characteristics largely depends on the number of sampling points or soil samples. The denser the sampling points and the more soil samples analyzed, the more accurately the range and concentration distribution characteristics of the pollutants can be obtained.

[0004] Currently, one common method for detecting pollutant concentrations in collected contaminated soil samples is inductively coupled plasma mass spectrometry (ICP-MS). ICP-MS offers high accuracy, but it often requires more time and expense. Another commonly used method is portable X-ray fluorescence (PXRF) analysis. PXRF is fast and inexpensive, but its accuracy is relatively lower. However, current technology does not combine the advantages of both methods, preventing a synergistic effect. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the current soil pollutant analysis equipment and methods for environmental supervision, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a soil pollutant analysis device for environmental monitoring.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a soil pollutant analysis device for environmental monitoring, comprising: a sampling component, including a movable support, a receiving platform set on the movable support, and a receiving vessel set on the receiving platform, wherein a protective cover is provided on the receiving platform to protect the receiving vessel, and a sampling component is provided between the movable support and the receiving platform; and an analysis component, including a soil analysis module, a concentration detection analysis module, and an interval processing component set inside the receiving vessel, wherein the interval processing component performs simultaneous analysis on soil samples collected at different depths, and the soil analysis module and the concentration detection analysis module perform simultaneous analysis on the soil, wherein the analysis device is used to establish a detection model corresponding to the target pollutant based on the PXRF concentration and ICP-MS concentration corresponding to each of the M soil samples, and the detection model reflects the mapping relationship between the ICP-MS concentration and the PXRF concentration.

[0009] As a preferred embodiment of the soil pollutant analysis equipment for environmental supervision described in this invention, the sampling component includes a probe rod mounted on a movable support, a drill bit connected to the lower end of the probe rod, a lifting column mounted outside the drill bit, a sample retention component mounted inside the lifting column, a connecting rod fixedly mounted on the outer surface of the sample retention component, and a motor mounted on the lifting column. The motor is connected to the probe rod via a bevel gear, and a receiving box is provided on the lifting column.

[0010] As a preferred embodiment of the soil pollutant analysis equipment for environmental supervision described in this invention, the drill bit is provided with a conical drilling section and a conveying section;

[0011] The sample retention component includes a soil inlet inside the lifting column, a movable cavity inside the lifting column, a soil box slidably connected inside the movable cavity, a spring fixedly connected to the bottom of the soil box and the movable cavity, a touch block movably connected inside the movable cavity, and a return spring fixedly connected to the touch block inside the movable cavity.

[0012] The soil inlet is connected to the movable cavity, and the soil box has a slot with the same size as the soil inlet.

[0013] In a preferred embodiment of the soil pollutant analysis device for environmental supervision described in this invention, a baffle is fixedly connected to one end of the connecting rod, and the baffle moves via the connecting rod when the soil box moves.

[0014] As a preferred embodiment of the soil pollutant analysis equipment for environmental supervision described in this invention, the transfer component includes a vertically arranged transmission link, a plurality of transport boxes arranged on the transmission link, and an opening on the transport box. The soil box has a mating port corresponding to the opening. A push plate is provided inside the soil box, and a cylinder is provided at the rear end of the push plate.

[0015] The transport box is detachably connected to the transmission link.

[0016] As a preferred embodiment of the soil pollutant analysis equipment for environmental supervision described in this invention, the receiving platform is provided with an adjustment component, which includes a conversion block disposed within the receiving platform, a soil retention pipe rotatably connected within the receiving platform, a rotating plate disposed at the lower end of the conversion block, a first guide groove opened on the rotating plate, and a fixing plate disposed at the lower end of the conversion block. The fixing plate is provided with a second guide groove. The first guide groove is arc-shaped, and the two ends of the first guide groove correspond to the two ends of the second guide groove. The second guide groove is opened along the radial direction of the fixing plate. A connecting rod is disposed between the first guide groove and the second guide groove, and the connecting rod is disposed corresponding to the soil retention pipe.

[0017] As a preferred embodiment of the soil pollutant analysis device for environmental supervision described in this invention, the lower end of the soil retention tube extends downward through an ear plate, a central rotating rod is hinged between the lower end of the soil retention tube and the connecting rod, a ring gear is provided on the outer edge of the rotating plate, a drive gear meshing with the ring gear is provided inside the storage box, and a drive motor connected to the drive gear is provided inside the storage box.

[0018] This invention also discloses an analytical method for a soil pollutant analysis device used in environmental monitoring, comprising,

[0019] Obtain the PXRF concentration and ICP-MS concentration of M soil samples from the target area. The ICP-MS concentration is obtained by detecting the concentration of the target pollutant using ICP-MS detection method, where N>M>1.

[0020] Based on the PXRF and ICP-MS concentrations of the M soil samples, a detection model corresponding to the target pollutant is established. The detection model reflects the mapping relationship between ICP-MS concentration and PXRF concentration.

[0021] The ICP-MS concentration of each of the N soil samples is determined based on the detection model and the PXRF concentration of each of the N soil samples.

[0022] Based on the ICP-MS concentrations of the N soil samples and their respective sampling locations, the concentration distribution characteristics of the target pollutant in the target area are determined.

[0023] The beneficial effects of this invention are as follows: Through the centrifugation action described above, the soil sample is mixed with the reaction liquid after being subjected to centrifugal force, which facilitates the subsequent measurement of PXRF concentration and ICP-MS concentration. The analysis module is used to establish the PXRF concentration and ICP-MS concentration corresponding to each of the M soil samples to establish a detection model corresponding to the target pollutant, so that the operator can intuitively know the soil pollutant concentration in the current soil environment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0025] Figure 1 This is a schematic diagram of the overall structure of the soil pollutant analysis equipment for environmental monitoring according to the present invention.

[0026] Figure 2 This is a cross-sectional schematic diagram of the overall structure of the soil pollutant analysis equipment for environmental monitoring according to the present invention.

[0027] Figure 3 This is an enlarged schematic diagram of the internal structure of the probe rod in the soil pollutant analysis equipment for environmental monitoring of the present invention.

[0028] Figure 4 The soil pollutant analysis equipment for environmental supervision described in this invention Figure 3 Enlarged schematic diagram of the upper part of the structure.

[0029] Figure 5 This is an enlarged schematic diagram of the adjustment component of the soil pollutant analysis device for environmental monitoring of the present invention.

[0030] Figure 6This is an exploded schematic diagram of the adjustment component of the soil pollutant analysis equipment for environmental supervision of the present invention. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0034] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth. Example

[0035] Reference Figure 1-6 This invention discloses a soil pollutant analysis device for environmental monitoring, including a sampling component 100. In this embodiment, the sampling component 100 includes a movable support 102, which can be moved on the ground. The operator can move the entire device by pushing the movable support 102 to the sampling location for collection. A receiving platform 103 is also provided on the movable support 102. The receiving platform 103 is the operator's operating area and is used to receive the collected soil samples. A receiving container, which is a glass container, is provided on the receiving platform 103 to receive part of the soil sample. A protective cover is provided on the receiving platform 103 to protect the receiving container. A sampling component 101 is provided between the movable support 102 and the receiving platform 103.

[0036] Furthermore, the present invention also includes an analysis component 200, which includes a soil analysis module 201, a concentration detection and analysis module 202, and an interval processing component 203 disposed in a receiving container. The interval processing component 203 performs simultaneous analysis on soil samples collected at different depths. The soil analysis module 201 and the concentration detection and analysis module 202 are used to perform simultaneous analysis on the soil. The analysis device is used to establish a detection model corresponding to the target pollutant based on the PXRF concentration and ICP-MS concentration of each of the M soil samples. The detection model reflects the mapping relationship between ICP-MS concentration and PXRF concentration.

[0037] In this embodiment, the sampling component 101 includes a probe rod 104 mounted on a movable support 102, a drill bit 101a rotatably connected to the lower end of the probe rod 104, a lifting column 101b mounted outside the drill bit 101a, a sample retention component 101c mounted inside the lifting column 101b, and a connecting rod 101d fixedly mounted on the outer surface of the sample retention component 101c. A movable housing 101e is mounted at the uppermost end of the drill bit 101a. A first bevel gear connected to the drill bit 101a and a second bevel gear meshing with the first bevel gear are mounted inside the movable housing 101e. A motor 101f is connected to the second bevel gear.

[0038] Furthermore, the drill bit 101a has a conical drilling section 101a-1 and a conveying section 101a-2.

[0039] Specifically, the sample retention component 101c includes a soil inlet 101c-1 opened inside the lifting column 101b, a movable cavity 101c-2 opened inside the lifting column 101b, a soil box 101c-3 slidably connected inside the movable cavity 101c-2, a spring 101c-4 fixedly connected to the bottom of the soil box 101c-3 and the movable cavity 101c-2, a trigger block 101c-5 movably connected inside the movable cavity 101c-2, and a reset spring 101c-6 fixedly connected to the trigger block 101c-5 inside the movable cavity 101c-2.

[0040] Furthermore, the soil inlet 101c-1 is connected to the movable cavity 101c-2, and the soil box 101c-3 has a slot, the size of which is the same as that of the soil inlet 101c-1.

[0041] More preferably, a baffle 101d-1 is fixedly connected to one end of the connecting rod 101d, and when the soil box 101c-3 moves, it will drive the baffle 101d-1 to move through the connecting rod 101d.

[0042] It should be noted that the sample retention component 101c has three identical sets inside the lifting column 101b.

[0043] In this embodiment, the adjustment component 300 includes a soil retention tube 302 rotatably connected in the mounting groove 300b, a locking block disposed on the soil retention tube 302, a rotating plate 304a disposed at the lower end of the conversion block 300a, a first guide groove 304b opened on the rotating plate 304a, and a fixing plate 304c disposed at the lower end of the conversion block 300a. A second guide groove 304d is opened on the fixing plate 304c. The first guide groove 304b is arc-shaped, and the two ends of the first guide groove 304b are corresponding to the two ends of the second guide groove 304d. The second guide groove 304d is opened along the radial direction of the fixing plate 304c. A connecting rod 305 is disposed between the first guide groove 304b and the second guide groove 304d, and each connecting rod 305 is disposed corresponding to the soil retention tube 302.

[0044] Preferably, the lower end of the soil retention tube 302 extends downward through the ear plate 306, a central rotating rod 307 is hinged between the lower end of the soil retention tube 302 and the connecting rod 305, a ring gear 308 is provided on the outer edge of the rotating plate 304a, a drive gear 309 that meshes with the ring gear 308 is provided in the storage box 102c, and a drive motor 309a connected to the drive gear 309 is provided in the storage box 102c.

[0045] Operating Procedure: During operation, the conveyor unit 101a-2 rotates, conveying the soil upwards. The soil then enters the soil container 101c-3 through the inlet 101c-1. As the conveyor unit 101a-2 continues to rotate, it touches the trigger block 101c-5, causing it to move back and forth under the force of the return spring 101c-6. The trigger block 101c-5 pushes the soil container 101c-3, causing it to move up and down frequently via the bottom spring 101c-4, shaking and evenly distributing the soil inside. When the soil inside the soil container 101c-3 reaches a certain weight, the soil container 101c-... 3. Driven by gravity, it will not be bounced back by spring 101c-4. At this time, the soil inlet 101c-1 is closed, completing the soil sampling. Then, the connecting rod 101d connected to the soil box 101c-3 drives the baffle 101d-1 to move downward, opening the second upper sampling component 101c. Repeat the above operation to collect the remaining two sampling components 101c. Because when the first sampling component 101c is collected, the soil inlets 101c-1 of the two upper sampling components 101c are not open, and the conveyor 101a-2 will continue to transport soil upward, so the other two sampling components 101c will collect soil at different depths.

[0046] The drive motor 309a is connected to a wireless data transceiver module via a data connection cable. The wireless data transceiver module is electrically connected to the control module 104 via a wireless module. After the electrical connection, an electrical signal is transmitted to the wireless data transceiver module and then to the drive motor 309a, thereby driving the drive motor 309a to rotate. The rotation of the drive motor 309a causes the rotating plate 304a to rotate, thereby causing the positions of several connecting rods 305 to change (from near the edge to near the center of the rotating plate 304a, or from the center). (To the edge), and the movement of the connecting rod 305 will cause the position of the lower end of the soil retention tube 302 to change. When the connecting rod 305 moves to the center position, it will pull the soil retention tube 302 to rotate, so that the lower end of the soil retention tube 302 rotates from the position near the edge to the position near the center, thereby adjusting the upper ends of the connecting rod 305 from the original state of being close to each other to the original state of being far apart. Then, through the forward and reverse rotation of the drive motor 309a, the state of the upper soil retention tube 302 is continuously changed, thereby performing centrifugal operation on the soil.

[0047] The centrifugation process creates a mixture between the soil sample and the reaction liquid, facilitating subsequent measurements of PXRF and ICP-MS concentrations. The analysis module establishes a detection model corresponding to the target pollutant for each of the M soil samples, providing the operator with a clear understanding of the current soil pollutant concentrations. Example

[0048] This invention also discloses an analytical method for a soil pollutant analysis device used in environmental monitoring, comprising,

[0049] Obtain the PXRF concentration and ICP-MS concentration of M soil samples from the target area. The ICP-MS concentration is obtained by detecting the concentration of the target pollutant using the ICP-MS detection method, where N>M>1.

[0050] Based on the PXRF and ICP-MS concentrations of M soil samples, a detection model corresponding to the target pollutant was established. The detection model reflects the mapping relationship between ICP-MS concentration and PXRF concentration.

[0051] The ICP-MS concentrations of the N soil samples were determined based on the detection model and the corresponding PXRF concentrations of the N soil samples.

[0052] Based on the ICP-MS concentrations of N soil samples and the sampling locations of the N soil samples, the concentration distribution characteristics of the target pollutant in the target area are determined.

[0053] Once all soil samples have been collected, specific analysis can be performed to identify the different layers of the soil.

[0054] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0055] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0056] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A soil pollutant analysis device for environmental monitoring, characterized in that: include, The sampling assembly (100) includes a movable support (102), a receiving platform (103) disposed on the movable support (102), and a receiving container disposed on the receiving platform (103). A protective cover is provided on the receiving platform (103) to protect the receiving container. A sampling component (101) is disposed between the movable support (102) and the receiving platform (103). An adjustment component (300) is provided on the receiving platform (103). The adjusting component (300) includes a conversion block (300a) disposed within the receiving platform (103), a soil retention pipe (302) rotatably connected within the receiving platform (103), a rotating plate (304a) disposed at the lower end of the conversion block (300a), a first guide groove (304b) opened on the rotating plate (304a), and a fixing plate (304c) disposed at the lower end of the conversion block (300a). A second guide groove (304d) is opened on the fixing plate (304c). The first guide groove (304b) is arc-shaped, and its two ends correspond to the two ends of the second guide groove (304d). The second guide groove (304d) is opened along the radial direction of the fixing plate (304c). A connecting rod (305) is disposed between the first guide groove (304b) and the second guide groove (304d). The connecting rod (305) is positioned corresponding to the soil retention pipe (302). The soil retention tube (302) has a lower end extending downwards from the ear plate (306). A pivot rod (307) is hinged between the lower end of the soil retention tube (302) and the connecting rod (305). A ring gear (308) is provided on the outer edge of the rotating plate (304a). A drive gear (309) meshing with the ring gear (308) is provided inside the receiving container. A drive motor (309a) connected to the drive gear (309) is provided inside the receiving container. The analysis component (200) includes a soil analysis module (201), a concentration detection analysis module (202), and an interval processing component (203) disposed in a receiving container. The interval processing component (203) performs simultaneous analysis on soil samples collected at different depths. The soil analysis module (201) and the concentration detection analysis module (202) are used to perform simultaneous analysis on the soil. The analysis equipment is used to establish a detection model corresponding to the target pollutant based on the PXRF concentration and ICP-MS concentration of each of the M soil samples. The detection model reflects the mapping relationship between the ICP-MS concentration and the PXRF concentration.

2. The soil pollutant analysis equipment for environmental monitoring as described in claim 1, characterized in that: The sampling component (101) includes a probe rod (104) mounted on a movable support (102), a drill bit (101a) connected to the lower end of the probe rod (104), a lifting column (101b) mounted outside the drill bit (101a), a sample retention component (101c) mounted inside the lifting column (101b), a connecting rod (101d) fixedly mounted on the outer surface of the sample retention component (101c), and a motor (101f) mounted on the lifting column (101b). The motor is connected to the probe rod via a bevel gear, and a receiving box (101e) is mounted on the lifting column (101b).

3. The soil pollutant analysis equipment for environmental monitoring as described in claim 2, characterized in that: The drill bit (101a) has a conical drilling section (101a-1) and a conveying section (101a-2). The sample retention component (101c) includes a soil inlet (101c-1) opened inside the lifting column (101b), a movable cavity (101c-2) opened inside the lifting column (101b), a soil box (101c-3) slidably connected inside the movable cavity (101c-2), a spring (101c-4) fixedly connected to the bottom of the soil box (101c-3) and the movable cavity (101c-2), an actuating block (101c-5) movably connected inside the movable cavity (101c-2), and a return spring (101c-6) fixedly connected to the actuating block (101c-5) inside the movable cavity (101c-2). The soil inlet (101c-1) is connected to the movable cavity (101c-2), and the soil box (101c-3) has a slot, the size of which is the same as that of the soil inlet (101c-1).

4. The soil pollutant analysis equipment for environmental monitoring as described in claim 3, characterized in that: One end of the connecting rod (101d) is fixedly connected to a baffle (101d-1). When the soil box (101c-3) moves, it will drive the baffle (101d-1) to move through the connecting rod (101d). The upper end of the probe rod (104) is provided with a transfer component.

5. The soil pollutant analysis equipment for environmental monitoring as described in claim 4, characterized in that: The transfer component includes a vertically arranged transmission link (204), a plurality of transport boxes (205) arranged on the transmission link, and an opening (206) opened on the transport box (205). The soil box (101c-3) has a mating port corresponding to the opening (206). The soil box (101c-3) is provided with a push plate, and the rear end of the push plate is provided with a cylinder. The transport box (205) is detachably connected to the transmission link (204).

6. An analytical method for a soil pollutant analysis device for environmental monitoring as described in any one of claims 1-5, characterized in that: include, Obtain the PXRF and ICP-MS concentrations of M soil samples from the target area. The ICP-MS concentrations are obtained by detecting the target pollutant using ICP-MS. Determine the ICP-MS concentrations of N soil samples based on the detection model and the PXRF concentrations of N soil samples; N>M>1. The soil sample was centrifuged using the adjustment components to ensure thorough mixing of the soil and the mixed liquid, followed by sedimentation after centrifugation. Based on the PXRF and ICP-MS concentrations of M soil samples, a detection model corresponding to the target pollutant was established. The detection model reflects the mapping relationship between ICP-MS concentration and PXRF concentration. Based on the ICP-MS concentrations of N soil samples and the sampling locations of the N soil samples, the concentration distribution characteristics of the target pollutant in the target area are determined.

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