Water sample chemical oxygen demand detection device

Abstract

The embodiment of the utility model provides a water sample chemical oxygen demand detection device, and belongs to the technical field of water quality detection and analysis. The device for detecting the chemical oxygen demand of the water sample comprises a shell which is of a tubular structure, and an open groove is formed in the middle of the shell; the light source emitter and the photoelectric detector are both arranged in the shell, the light source emitter is located on one side of the open type groove, the photoelectric detector is located on the other side of the open type groove, and the light source emitter and the photoelectric detector are correspondingly arranged; the light source emitter is used for emitting a detection light source penetrating through the open groove, and the photoelectric detector is used for receiving the detection light source from the light source emitter in the open groove. According to the invention, detection of various complex water bodies with relatively strong fluidity can be realized, and the accuracy of chemical oxygen demand detection of the complex water bodies is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water quality detection and analysis, and in particular to a device for detecting chemical oxygen demand of a water sample. Background Art

[0002] In order to understand the water quality of water bodies, water samples need to be tested. Among them, Chemical Oxygen Demand (COD) is a commonly used indicator to detect the amount of organic matter in water samples, and the greater the COD, the more serious the water body is polluted by organic matter.

[0003] In the related technology, chemical and optical methods are used to detect COD in water. However, the chemical method is complicated to operate, takes a long time to react, and is prone to secondary pollution to the environment; while the current optical method is only applicable to the detection of static water bodies, and the optical detection device used is usually large in size, which is not applicable to complex water bodies with strong fluidity. Utility Model Content

[0004] The main purpose of the embodiments of the present application is to provide a water sample chemical oxygen demand detection device, which can realize the chemical oxygen demand detection of complex water bodies with strong fluidity.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a water sample chemical oxygen demand detection device, the device comprising:

[0006] A shell, the shell is a tubular structure, and an open groove is provided in the middle of the shell;

[0007] A light source emitter and a photodetector, wherein the light source emitter and the photodetector are both arranged in the shell, the light source emitter is located on one side of the open groove, the photodetector is located on the other side of the open groove, and the light source emitter and the photodetector are arranged correspondingly; the light source emitter is used to emit a detection light source passing through the open groove, and the photodetector is used to receive the detection light source from the light source emitter in the open groove.

[0008] In some embodiments, the light source emitter includes a first light source emitter, a second light source emitter and a third light source emitter, the first light source emitter, the second light source emitter and the third light source emitter are arranged in a triangle shape, the first light source emitter is used to emit a first detection light source with a wavelength band of 245nm, the second light source emitter is used to emit a second detection light source with a wavelength band of 280nm, and the third light source emitter is used to emit a third detection light source with a wavelength band of 546nm, and the first detection light source, the second detection light source and the third detection light source are all single-point direct light sources.

[0009] In some embodiments, a first switch, a second switch and a third switch are provided on the shell, wherein the first switch is used to drive the first light source emitter, the second switch is used to drive the second light source emitter, and the third switch is used to drive the third light source emitter.

[0010] In some embodiments, there are multiple light source emitters and photodetectors, and the wavelength band of the detection light source emitted by each of the light source emitters is different.

[0011] In some embodiments, the shell on one side of the open groove is a first tubular structure, and the shell on the other side of the open groove is a second tubular structure, and the first tubular structure and the second tubular structure are different.

[0012] In some embodiments, the bottom surface of the open groove is a flat groove surface.

[0013] In some embodiments, glass plates for sealing are disposed on both sides of the open groove.

[0014] In some embodiments, a single-chip control module and a motor drive module connected by wiring are disposed in the housing, and the single-chip control module is connected to the light source emitter and the photodetector.

[0015] In some embodiments, the motor drive module is further connected to a cleaning brush, and the cleaning brush is disposed in the open groove.

[0016] In some embodiments, the water sample chemical oxygen demand detection device is also provided with a signal transmission interface, the signal transmission interface is connected to the single-chip control module, and the signal transmission interface is used to connect to an external device.

[0017] The present application provides a water sample chemical oxygen demand detection device, which includes a shell, the shell is provided with an open groove; a light source emitter and a photodetector, the light source emitter is provided on one side of the open groove, and the photodetector is provided on the other side of the open groove, and the light source emitter and the photodetector are arranged correspondingly; the light source emitter is used to emit a detection light source that passes through the open groove and is received by the photodetector.

[0018] The embodiments of the present application include at least the following beneficial effects: the open groove of the water sample chemical oxygen demand detection device of the embodiment of the present application can allow complex water bodies with strong fluidity to pass through, and the light source emitter can emit a detection light source that passes through the open groove. When the water sample flows through the open groove, the water sample can absorb a specific band in the detection light source, and the absorbed detection light source can be received by the photoelectric detector, thereby completing the detection of the flowing water sample. The water sample chemical oxygen demand detection device is small in size, can realize the detection of various complex water bodies with strong fluidity, and improve the accuracy of chemical oxygen demand detection of complex water bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an optional schematic diagram of the appearance of the water sample chemical oxygen demand detection device provided in the embodiment of the present application;

[0020] Figure 2 This is another optional schematic diagram of the appearance of the water sample chemical oxygen demand detection device provided in the embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of an optional organic matter absorption spectrum of the water sample chemical oxygen demand detection device provided in the embodiment of the present application;

[0022] Figure 4 This is another optional organic matter absorption spectrum schematic diagram of the water sample chemical oxygen demand detection device provided in the embodiment of the present application;

[0023] Figure 5 This is an optional internal structure diagram of a water sample chemical oxygen demand detection device provided in an embodiment of the present application;

[0024] Figure 6 It is an optional schematic diagram of verification test results of the water sample chemical oxygen demand detection device provided in the embodiment of the present application.

[0025] Reference numerals: housing 101 , open groove 102 , light source emitter 103 , photodetector 104 , single chip control module 105 , motor drive module 106 , cleaning brush 107 , signal transmission interface 108 . DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0029] First, some nouns involved in this application are analyzed:

[0030] Chemical oxygen demand is an indicator used to assess the content of organic matter in water bodies. It represents the amount of oxygen required for a chemical oxidant (usually a high concentration of strong oxidant, such as a high concentration of acidic potassium perchromate solution) to oxidize organic matter in a water sample under specific conditions.

[0031] In real life, in order to understand the water quality of water bodies, water samples need to be tested. Among them, chemical oxygen demand is a common indicator for testing the amount of organic matter in water samples, and the larger the chemical oxygen demand, the more serious the water body is polluted by organic matter.

[0032] In the related technology, chemical and optical methods are used to detect COD in water. However, the chemical method is complicated to operate, takes a long time to react, and is prone to secondary pollution to the environment; while the current optical method is only applicable to the detection of static water bodies, and the optical detection device used is usually large in size, which is not applicable to complex water bodies with strong fluidity.

[0033] Based on this, the present application provides a water sample chemical oxygen demand detection device, which includes a shell, the shell is provided with an open groove; a light source emitter and a photodetector, the light source emitter is provided on one side of the open groove, and the photodetector is provided on the other side of the open groove, and the light source emitter and the photodetector are arranged correspondingly; the light source emitter is used to emit a detection light source that passes through the open groove and is received by the photodetector.

[0034] The embodiments of the present application include at least the following beneficial effects: the open groove of the water sample chemical oxygen demand detection device of the embodiment of the present application can allow complex water bodies with strong fluidity to pass through, and the light source emitter can emit a detection light source that passes through the open groove. When the water sample flows through the open groove, the water sample can absorb a specific band in the detection light source, and the absorbed detection light source can be received by the photoelectric detector, thereby completing the detection of the flowing water sample. The water sample chemical oxygen demand detection device is small in size, can realize the detection of various complex water bodies with strong fluidity, and improve the accuracy of chemical oxygen demand detection of complex water bodies.

[0035] The following is combined with Figures 1 to 6 , further elaborating on the embodiments of the present application, wherein the reference numerals of the various structures are in the attached Figures 1 to 6 Mentioned in .

[0036] like Figure 1 As shown, Figure 1 It is an optional schematic diagram of the appearance of the water sample chemical oxygen demand detection device provided in the embodiment of the present application. The water sample chemical oxygen demand detection device includes a housing 101, the housing 101 is a tubular structure, and an open groove 102 is arranged in the middle of the housing 101; a light source emitter 103 and a photodetector 104, the light source emitter 103 and the photodetector 104 are both arranged in the housing 101, the light source emitter 103 is located on one side of the open groove 102, and the photodetector 104 is located on the other side of the open groove 102, and the light source emitter 103 and the photodetector 104 are arranged correspondingly; the light source emitter 103 is used to emit a detection light source passing through the open groove 102, and the photodetector 104 is used to receive the detection light source from the light source emitter 103 in the open groove 102.

[0037] Furthermore, in order to better illustrate the appearance and structure of the water sample chemical oxygen demand detection device, another diagram is provided. Figure 2 , Figure 2 is another optional schematic diagram of the appearance of the water sample chemical oxygen demand detection device provided in the embodiment of the present application, wherein: Figure 1 It is obtained from the side where the light source emitter 103 can be observed from the water sample chemical oxygen demand detection device, Figure 2 It is obtained from the side of the photodetector 104 that can be observed from the water sample chemical oxygen demand detection device (for the convenience of description, it may also be referred to as the "device" below), and, for the sake of ease of understanding, the side of the photodetector 104 is the left side of the device, and the side of the light source emitter 103 is the right side of the device.

[0038] It should be noted that the installation of the light source emitter 103 and the photodetector 104 on the left or right side of the device can be set according to actual conditions. The embodiments of the present application are only described as preferred embodiments, and no specific limitations are made.

[0039] Furthermore, the device can be placed in a flowing water body, such as a river. The water body can pass through the open groove 102 of the device. At this time, the light source emitter 103 can emit a detection light source. The detection light source passes through the flowing water body, and the flowing water body absorbs a specific wavelength band in the detection light source. The absorbed detection light source can be received by the photodetector 104.

[0040] Among them, the photodetector 104 is a device for converting an optical signal into an electrical signal. That is, after receiving the absorbed detection light source, the photodetector 104 can convert it into an electrical signal for further analysis and processing operations based on this electrical signal.

[0041] It should be noted that when the water body to be detected is a static water body placed in a certain container, the device can also be used to detect the chemical oxygen demand of the static water body. This application is only illustrated by preferred embodiments and is not specifically limited.

[0042] In some embodiments, the light source emitter 103 includes a first light source emitter, a second light source emitter, and a third light source emitter. The first light source emitter, the second light source emitter, and the third light source emitter are arranged in a triangular shape. The first light source emitter is used to emit a first detection light source with a wavelength band of 245 nm, the second light source emitter is used to emit a second detection light source with a wavelength band of 280 nm, and the third light source emitter is used to emit a third detection light source with a wavelength band of 546 nm. The first detection light source, the second detection light source, and the third detection light source are all single-point direct light sources.

[0043] Furthermore, as Figure 1 and Figure 2 shown, the three light source emitters 103 can be arranged in a triangular shape like a Chinese character "pin". In this way, the detection light source emitted by the light source emitter 103 can pass through the open groove 102 more evenly. Moreover, the three photodetectors 104 and the three light source emitters 103 are also arranged in a corresponding triangular shape to receive the absorbed detection light source.

[0044] It can be understood that since the existing water sample chemical oxygen demand detection devices are usually used for static water bodies, the single-wavelength detection light source they emit can meet the detection requirements for static water bodies. However, when the existing water sample chemical oxygen demand detection devices are used for the detection of complex flowing water bodies, they are often not applicable.

[0045] Furthermore, as Figure 3 shown, Figure 31 is an optional organic absorption spectrum diagram of the water sample chemical oxygen demand detection device provided in the embodiment of the present application. In order to determine the wavelength band of the detection light source of the added light source emitter 103, a 50 mg / L potassium hydrogen phthalate (C8H5KO4, KHP) standard solution is used as a water sample substitute to conduct an experiment to obtain an absorption spectrum diagram. It can be found that its absorption peaks appear near 242 nanometers (nm) and 280nm; similarly, Figure 4 As shown, Figure 4 This is another optional organic matter absorption spectrum schematic diagram of the water sample chemical oxygen demand detection device provided in the embodiment of the present application. The absorption spectra corresponding to 10 groups of potassium hydrogen phthalate standard solutions are configured with a range of 0 to 250 mg / L and a gradient of 25 mg / L. It can be found that the absorption peaks of each group of standard solutions also appear near 245 nm and 280 nm.

[0046] Therefore, the device adopts three light source emitters 103, wherein the first light source emitter is used to emit a first detection light source with a wavelength of 245nm, the second light source emitter is used to emit a second detection light source with a wavelength of 280nm, and the third light source emitter is used to emit a third detection light source with a wavelength of 546nm.

[0047] It can be understood that the device of the embodiment of the present application includes a detection light source with multiple bands, so that it can cover a wider spectral range so that complex water bodies can absorb it, thereby improving the accuracy of chemical oxygen demand detected by the device.

[0048] Furthermore, the third detection light source with a wavelength of 546 nm is used as a reference light source to complete the interference treatment of suspended matter and the like in the environment where the water sample to be tested is located.

[0049] Furthermore, the first detection light source, the second detection light source and the third detection light source all adopt single-point direct light sources. In comparison, the existing water sample chemical oxygen demand detection device adopts a xenon lamp as the emitting light source, and the xenon lamp is large in size and requires a long driving time during operation, so the energy consumption generated by the xenon lamp is large and the service life is short; the single-point direct light source used in the present device has low energy consumption, short driving time and long service life. In addition, the light beam of the single-point direct light source has stronger focusing power and the light source is more stable. Therefore, the accuracy of water sample detection can be further improved. Moreover, since the equipment that can generate a single-point direct light source is usually small in size, the overall size of the device provided in the embodiment of the present application is also relatively small, which can realize simple detection of complex flowing water bodies.

[0050] In some embodiments, a first switch, a second switch and a third switch (not shown) are provided on the shell 101, wherein the first switch is used to drive the first light source emitter, the second switch is used to drive the second light source emitter, and the third switch is used to drive the third light source emitter.

[0051] Furthermore, by controlling the light source emitter 103 through the switch, a combination of detection light sources of multiple bands can be achieved. For example, when the user turns on the first switch and the third switch and turns off the second switch, the device can emit a first detection light source with a band of 245nm and a third detection light source with a band of 546nm. At this time, the device can detect simple water bodies, such as still water bodies, so that the device is not only satisfied with the detection of complex flowing water bodies, but also broadens the application scenarios of the device.

[0052] In some embodiments, there are multiple light source emitters 103 and photodetectors 104 , and the wavelength bands of the detection light sources emitted by each light source emitter 103 are different.

[0053] Furthermore, the number of light source emitters 103 and photodetectors 104 can also be increased according to actual conditions to meet the detection of more complex water bodies or specific water bodies by the device. It should be noted that when the light source emitter 103 is increased, the photodetector 104 and the switch are increased synchronously, and the wavelength band of the detection light source of the added light source emitter 103 can be set according to the specific situation, and the embodiment of the present application does not make specific restrictions.

[0054] In some embodiments, the housing 101 on one side of the open groove 102 is a first tubular structure, and the housing 101 on the other side of the open groove 102 is a second tubular structure, and the first tubular structure and the second tubular structure are different.

[0055] Furthermore, if Figure 1 As shown, the housing 101 on both sides of the open groove 102 can be cylindrical, and the streamlined design can facilitate the flow of the water sample. Alternatively, the first tubular structure is cylindrical, so that the part extending into the water body can facilitate the flow of the water sample, and the second tubular structure is polygonal, such as a rectangular shape, a multi-faceted shape, etc., and the second tubular structure can also be provided with raised patterns to increase friction and play a role in anti-slip, so that the user can hold the device.

[0056] In some embodiments, the bottom surface of the open groove 102 is a flat groove surface.

[0057] Furthermore, if Figure 2As shown, the bottom surface of the open groove 102 of the device is a flat groove surface without protrusions, so that when the flowing water passes through the open groove 102, the resistance can be reduced, so that the flowing water can pass through the open groove 102 better, which is convenient for the detection of chemical oxygen demand in the water. At the same time, the flat groove surface can also avoid the occurrence of organic matter deposition, reducing the probability of misjudgment of the chemical oxygen demand value.

[0058] In some embodiments, glass plates for sealing are disposed on both sides of the open groove 102 .

[0059] Furthermore, since the light source emitter 103 and the photodetector 104 are both electronic devices, in order to improve the stability, reliability and safety of detection, glass plates are arranged on both sides of the open groove 102, and the sealed glass plates will not affect the light source emitted by the light source emitter 103 and the reception of the detection light source by the photodetector 104.

[0060] In some embodiments, a single-chip control module 105 and a motor driving module 106 connected by wiring are disposed in the housing 101 , and the single-chip control module 105 is connected to the light source emitter 103 and the photodetector 104 .

[0061] like Figure 5 As shown, Figure 5 It is an optional internal structure diagram of the water sample chemical oxygen demand detection device provided in an embodiment of the present application. A single-chip control module 105 and a motor drive module 106 connected by wiring are also provided in the shell 101. The single-chip control module 105 is connected to the light source emitter 103 and the photodetector 104.

[0062] Furthermore, the device may encapsulate a single-chip control module 105 and a motor drive module 106 in the housing 101, and the single-chip control module 105 and the motor drive module 106 may be connected to the light source emitter 103 and the photodetector 104 through a wire. The single-chip control module 105 is provided with a control circuit, which can analyze and process the electrical signal converted by the photodetector 104; the motor drive module 106 is provided with a DC motor, which can provide electrical energy support for the light source emitter 103 and the photodetector 104.

[0063] Alternatively, since the power required by each device is different, the light source emitter 103 and the photodetector 104 can both be equipped with dedicated power supply batteries. In this case, the motor drive module 106 can independently provide high-power electrical energy to the single-chip control module 105 .

[0064] In some embodiments, the motor driving module 106 is further connected to a cleaning brush 107 , and the cleaning brush 107 is disposed adjacent to the open groove 102 .

[0065] Furthermore, the device provided in the embodiment of the present application is also provided with a cleaning brush, wherein the cleaning brush 107 is arranged on the bottom surface of the open groove 102, or, annular tracks are also provided on both sides of the open groove 102, so that the cleaning brush 107 can move to clean the bottom surface of the groove while also being able to move around the open groove 102 and clean the side walls of the open groove 102.

[0066] Furthermore, the motor drive module 106 is connected to the cleaning brush 107. When the cleaning brush 107 is started, the cleaning brush 107 can clean the bottom and sides of the open groove 102. For example, the cleaning brush 107 can be used to clean mud and algae after using the device to prevent pollutants from affecting the detection light source.

[0067] In some embodiments, the water sample chemical oxygen demand detection device is further provided with a signal transmission interface 108 , which is connected to the single-chip control module 105 , and is used to connect to an external device.

[0068] Furthermore, if Figure 6 As shown, Figure 6 This is an optional module connection diagram of the water sample chemical oxygen demand detection device provided in an embodiment of the present application. The detection light source emitted by the light source transmitter 103 can be received by the photodetector 104 after being absorbed by the detection water sample. The photodetector 104 has a built-in signal processing circuit for converting the optical signal into an electrical signal. The motor drive module 106 can drive the single-chip control module 105 to work. The electrical signal is received by the single-chip control module 105 and transmitted to the external device connected to it by the RS485 circuit through the signal transmission interface 108.

[0069] Furthermore, the external device may be a host computer to further analyze and process the transmitted electrical signal.

[0070] In order to better illustrate the beneficial effects of the water sample chemical oxygen demand detection device provided in the embodiment of the present application, the following verification tests were performed on the device:

[0071] For example, potassium hydrogen phthalate standard solutions with concentrations of 25 mg / L, 100 mg / L, and 200 mg / L and laboratory ultrapure water are prepared respectively; then, the device is placed in the above three standard solutions for calibration, including: using laboratory ultrapure water to calibrate the zero point of the detection device to eliminate the error caused by the zero drift of the device; using 25 mg / L and 100 mg / L to calibrate the normalized parameters of low concentrations to put the detection device in a linear detection state; using 100 mg / L and 200 mg / L as the starting point and end point of the medium concentration gradient to complete the calibration. Linear calibration is performed; finally, the sensor is placed in the collected river water and tap water to detect the chemical oxygen demand value, and compared with the laboratory test results, and the verification test results are shown in Tables 1 and 2 below, wherein Table 1 is an optional test comparison result of the water sample chemical oxygen demand detection device provided in an embodiment of the present application, and Table 2 is another optional test comparison result of the water sample chemical oxygen demand detection device provided in an embodiment of the present application. It can be seen from Tables 1 and 2 that the error between the present application and the laboratory test results is within 4.67%, and a higher-precision chemical oxygen demand detection of water samples can be achieved.

[0072] Table 1

[0073]

[0074]

[0075] Table 2

[0076]

[0077] It can be understood that compared with the disadvantages of long reaction time and easy environmental pollution caused by the use of chemical reagents in the laboratory, the water sample chemical oxygen demand detection device provided in the embodiment of the present application can realize the rapid detection of chemical oxygen demand of water samples, and will hardly cause pollution to the environment, and has extremely high practical application value.

[0078] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0079] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A water sample chemical oxygen demand detection device, characterized in that: The device comprises: A shell, the shell is a tubular structure, and an open groove is provided in the middle of the shell; A light source emitter and a photodetector, wherein the light source emitter and the photodetector are both arranged in the shell, the light source emitter is located on one side of the open groove, the photodetector is located on the other side of the open groove, and the light source emitter and the photodetector are arranged correspondingly; the light source emitter is used to emit a detection light source passing through the open groove, and the photodetector is used to receive the detection light source from the light source emitter in the open groove.

2. The water sample chemical oxygen demand detection device according to claim 1, characterized in that: The light source emitter includes a first light source emitter, a second light source emitter and a third light source emitter, the first light source emitter, the second light source emitter and the third light source emitter are arranged in a triangle shape, the first light source emitter is used to emit a first detection light source with a wavelength band of 245nm, the second light source emitter is used to emit a second detection light source with a wavelength band of 280nm, and the third light source emitter is used to emit a third detection light source with a wavelength band of 546nm, and the first detection light source, the second detection light source and the third detection light source are all single-point direct light sources.

3. The water sample chemical oxygen demand detection device according to claim 2, characterized in that: The housing is provided with a first switch, a second switch and a third switch, wherein the first switch is used to drive the first light source emitter, the second switch is used to drive the second light source emitter, and the third switch is used to drive the third light source emitter.

4. The water sample chemical oxygen demand detection device according to claim 1, characterized in that: There are multiple light source emitters and photodetectors, and the wavelength bands of the detection light sources emitted by each of the light source emitters are different.

5. The water sample chemical oxygen demand detection device according to claim 1, characterized in that: The shell on one side of the open groove is a first tubular structure, and the shell on the other side of the open groove is a second tubular structure, and the first tubular structure and the second tubular structure are different.

6. The water sample chemical oxygen demand detection device according to claim 1, characterized in that: The bottom surface of the open groove is a flat groove surface.

7. The water sample chemical oxygen demand detection device according to claim 1, characterized in that: Glass plates for sealing are arranged on both sides of the open groove.

8. The water sample chemical oxygen demand detection device according to claim 1, characterized in that: The housing is provided with a single-chip control module and a motor drive module connected by wiring, and the single-chip control module is connected to the light source emitter and the photoelectric detector.

9. The water sample chemical oxygen demand detection device according to claim 8, characterized in that: The motor driving module is also connected to a cleaning brush, and the cleaning brush is attached to the open groove.

10. The water sample chemical oxygen demand detection device according to claim 8, characterized in that: The water sample chemical oxygen demand detection device is also provided with a signal transmission interface, the signal transmission interface is connected to the single chip control module, and the signal transmission interface is used to connect to an external device.

Images