Nutrient analyzer

Abstract

The present invention discloses a nutrient salt analyzer, which includes a first controller, a touch screen, a wireless communication module, a waterway board assembly, an electromagnetic valve assembly, a reagent tube assembly, an injection pump, a buffer tube and a colorimetric detection device; the electromagnetic valve assembly, the reagent tube assembly and the buffer tube are all connected to the waterway board assembly; the injection pump connects the waterway board assembly and the buffer tube, and the injection pump is used to drive the reagent in the water sample and the reagent tube assembly into the buffer tube for mixing reaction, and transport the mixed solution after the reaction to the colorimetric detection device for absorbance detection; wherein, the touch screen, the wireless communication module, the waterway board assembly, the electromagnetic valve assembly, the injection pump and the colorimetric detection device are all electrically connected to the first controller; the first controller is used to receive a touch signal of the touch screen to control the waterway board assembly, the electromagnetic valve assembly, the injection pump and the colorimetric detection device to automatically run to detect the nutrient salt content of the water sample, and the wireless communication module transmits the data detected by the colorimetric detection device to the terminal.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, and in particular to a nutrient analyzer. Background Technology

[0002] Nutrients are essential building blocks for the growth of marine phytoplankton. The concentration and composition of nutrients in seawater affect marine primary productivity, regulate phytoplankton community structure, and thus influence the structure of the marine ecosystem. In normal seawater, adequate nutrients promote the reproduction and growth of organisms; however, excessive nutrients can cause certain marine organisms to multiply rapidly, leading to excessive consumption of dissolved oxygen in the seawater, resulting in oxygen depletion and mass mortality of fish, shrimp, crabs, and shellfish. The pollution of the ocean by organic matter and nutrients is now termed "eutrophication." Understanding the spatiotemporal distribution and changes of nutrients in the ocean is crucial for understanding key processes in marine ecosystems and for assessing and controlling eutrophication. Seawater nutrients are essential components for the growth and reproduction of marine phytoplankton and are the foundation of marine primary productivity and the food chain. Therefore, the nutrient content in seawater is an important parameter for marine ecological environment monitoring and is one of the routine marine monitoring items.

[0003] Traditional methods for determining seawater nutrients rely on on-site sampling from research vessels followed by laboratory analysis. This method suffers from drawbacks such as poor real-time performance, wasted manpower, resources, and time, and sample contamination. Errors during collection, pretreatment, loading, and transportation can range from -20% to +45%. Furthermore, it cannot provide continuous data and struggles to detect rapid changes in nutrient concentrations caused by intermittent events like rainfall and algal blooms. Decades of marine monitoring research have demonstrated that traditional methods are no longer sufficient for current needs. There is an urgent need to address the problems of existing seawater nutrient analyzers, including complex procedures, high consumable costs, offline analysis, and inability to measure low concentrations.

[0004] To address the shortcomings of traditional seawater nutrient detection methods, some in-situ nutrient analyzers have been developed on the market. These analyzers utilize motor drives, microprocessors, multi-channel valves, and syringes to achieve continuous and automatic sampling and analysis of nutrient content, and can perform online analysis of multiple components. However, these in-situ analyzers are only suitable for in-situ online monitoring applications such as buoys and shore-based systems. They lack the capability for on-site user operation and data network transmission. Furthermore, their use and maintenance require specialized technicians, making them very inconvenient to use.

[0005] Therefore, it is of great significance to develop a nutrient analyzer that can support on-site use, remotely transmit detection data in real time, is easy to operate, and provides accurate detection data. Summary of the Invention

[0006] In view of this, the present invention proposes a nutrient analyzer that can be used on-site, can transmit test data remotely in real time, is easy to operate, and provides accurate test data.

[0007] To achieve the above objectives, this invention proposes a nutrient analyzer for detecting the nutrient content of a water sample. The nutrient analyzer includes a first controller, a touch screen, a wireless communication module, a water circuit board assembly, a solenoid valve assembly, a reagent tube assembly, a syringe pump, a buffer tube, and a colorimetric detection device. The solenoid valve assembly, the reagent tube assembly, and the buffer tube are all connected to the water circuit board assembly. The syringe pump is connected to the water circuit board assembly and the buffer tube. The syringe pump drives the water sample and the reagent in the reagent tube assembly into the buffer tube for mixing and reaction, and delivers the resulting mixture to the colorimetric detection device for absorbance detection.

[0008] The touch screen, the wireless communication module, the water circuit board assembly, the solenoid valve assembly, the injection pump, and the colorimetric detection device are all electrically connected to the first controller. The first controller is used to receive touch signals from the touch screen to control the water circuit board assembly, the solenoid valve assembly, the injection pump, and the colorimetric detection device to automatically operate and detect the nutrient content of the water sample. The wireless communication module is used to transmit the data detected by the colorimetric detection device to the terminal.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0010] The nutrient analyzer proposed in this invention is suitable for on-site testing. It is configured with a touchscreen, wireless communication module, water circuit board assembly, solenoid valve assembly, syringe pump, and colorimetric detection device all electrically connected to a first controller. The first controller receives touch signals from the touchscreen to control the automatic operation of the water circuit board assembly, solenoid valve assembly, syringe pump, and colorimetric detection device to detect the nutrient content of water samples. In other words, the operator only needs to click a few buttons on the touchscreen for the nutrient analyzer to automatically detect the nutrient content of the water sample. The operation is very simple, and even technicians without specialized knowledge can use this nutrient analyzer to test water samples. The device transmits data from the colorimetric analyzer to the terminal in real time via a wireless communication module, allowing users to query and retrieve the data. A syringe pump enables quantitative liquid delivery; its minimum injection volume is approximately 1 μL, and the sampling accuracy error is less than or equal to 1%. Therefore, even with micro-injection, the accuracy of reagent mixing, data stability, and precision are guaranteed. Furthermore, the micro-injection via the syringe pump reduces reagent and pure water consumption and wastewater generation, eliminating the need to carry large quantities of reagents and pure water to the testing site and avoiding the problem of large amounts of difficult-to-treat wastewater. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a block diagram of the nutrient analyzer provided in an embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the nutrient analyzer provided in an embodiment of the present invention;

[0014] Figure 3 This is an exploded schematic diagram of a nutrient analyzer provided in an embodiment of the present invention;

[0015] Figure 4 This is another exploded view of the nutrient analyzer provided in the embodiment of the present invention;

[0016] Figure 5 This is a first-view schematic diagram of a partial structure for nutrient analysis provided in an embodiment of the present invention;

[0017] Figure 6 This is a second-view schematic diagram of a partial structure for nutrient analysis provided in an embodiment of the present invention;

[0018] Figure 7 This is an exploded view of the reagent tube assembly provided in an embodiment of the present invention;

[0019] Figure 8 This is a schematic diagram of the structure of the intermediate shell provided in an embodiment of the present invention;

[0020] Figure 9 yes Figure 8 Enlarged view of a portion of point E in the middle;

[0021] Figure 10 This is an exploded view of a partial structure of the nutrient analyzer provided in an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0024] Please see Figure 1-6 This invention discloses a nutrient analyzer 100, comprising a first controller 11, a touch screen 12, a wireless communication module 13, a water circuit board assembly 14, a solenoid valve assembly 15, a reagent tube assembly 16, a syringe pump 17, a buffer tube 18, a colorimetric detection device 19, a main board 31, and a second controller 32. The solenoid valve assembly 15, the reagent tube assembly 16, and the buffer tube 18 are all connected to the water circuit board assembly 14. The syringe pump 17 is connected to the water circuit board assembly 14 and the buffer tube 18. The syringe pump 17 is used to drive the water sample and the reagent in the reagent tube assembly 16 into the buffer tube 18 for mixing and reaction, and to deliver the resulting mixture to the colorimetric detection device 19 for absorbance detection. The second controller 32 is electrically connected to the syringe pump 17 through the main board 31, and the second controller 32 is used to control the operation of the syringe pump 17.

[0025] The touch screen 12, wireless communication module 13, water circuit board assembly 14, solenoid valve assembly 15, syringe pump 17, and colorimetric detection device 19 are electrically connected to the first controller 11 via the motherboard 31. The first controller 11 receives touch signals from the touch screen 12 to control the automatic operation of the water circuit board assembly 14, solenoid valve assembly 15, syringe pump 17, and colorimetric detection device 19 to detect the nutrient content of the water sample. Optionally, the first controller 11 uses a PLC module. The wireless communication module 13 transmits the data detected by the colorimetric detection device 19 to the terminal.

[0026] The solenoid valve assembly 15 includes multiple solenoid valves, each of which is connected to a port of the water circuit board assembly 14. The first controller 11 controls the on / off state of each solenoid valve according to a preset setting.

[0027] For example, the wireless communication module 13 can transmit the detected data to the cloud platform 33, and the user can query and obtain the detected data through an APP on the terminal 34 (e.g., mobile phone, laptop, tablet, etc.). In some optional embodiments, the wireless communication module 13 also includes the location information of the nutrient analyzer 10.

[0028] The above technical solution is applicable to on-site testing. By setting the touch screen 12, wireless communication module 13, water circuit board assembly 14, solenoid valve assembly 15, injection pump 17, and colorimetric detection device 19 to be electrically connected to the first controller 11, the first controller 11 receives the touch signal from the touch screen 12 to control the water circuit board assembly 14, solenoid valve assembly 15, injection pump 17, and colorimetric detection device 19 to automatically operate and detect the nutrient content of the water sample. That is, the operator only needs to click a few buttons on the touch screen 12, and the nutrient analyzer 10 can automatically detect the nutrient content of the water sample. The operation is very simple, and even technicians without professional knowledge can use the nutrient analyzer to test the water sample. By setting the wireless communication module 13, the data detected by the colorimetric detection device 19 is transmitted to the terminal in real time, and the user can query and obtain the data in real time.

[0029] Conventional nutrient analyzers use peristaltic pumps for quantitative liquid delivery. When the injection volume is 2 ml, the sampling accuracy error of the peristaltic pump can be less than or equal to 1%. However, when the injection volume is less than 1 ml, the sampling accuracy error increases, leading to decreased reagent mixing accuracy and making it difficult to guarantee data stability and precision. In this embodiment, a syringe pump 19 is used for quantitative liquid delivery. The minimum injection volume of the syringe pump 19 is approximately 1 μL, and its sampling accuracy error can also be less than or equal to 1%. Therefore, even with micro-injection, the accuracy of reagent mixing and the stability and precision of data can be guaranteed. Furthermore, by setting the syringe pump for micro-injection, the nutrient analyzer consumes less reagent and pure water, resulting in less waste liquid. Therefore, there is no need to carry large amounts of reagents and pure water to the testing site, and the problem of large amounts of difficult-to-treat wastewater is avoided.

[0030] In an optional embodiment, the nutrient analyzer 100 further includes an ultraviolet digestion tube 20, which includes an ultraviolet lamp source and an ultraviolet lamp tube. The ultraviolet lamp tube is connected to the water circuit board assembly 14, the ultraviolet lamp source is installed on the ultraviolet lamp tube, and the inner wall of the ultraviolet lamp tube is provided with a reflective layer.

[0031] For example, the ultraviolet lamp source is a cold cathode low-voltage ultraviolet lamp source with a wavelength of 254 nanometers. The ultraviolet lamp tube is a polytetrafluoroethylene (PTFE) tube with high ultraviolet light transmission, and the reflective layer is an aluminum film. The aluminum film can effectively improve the reflectivity of ultraviolet and infrared rays, improving the utilization rate of ultraviolet rays while also providing a certain degree of heat insulation. The ultraviolet digestion tube 21 provided in this embodiment can operate under low voltage (less than 24V) and power greater than 3W conditions, and the digestion rate can reach more than 80%.

[0032] In an optional embodiment, the nutrient analyzer 100 further includes a first high-pressure valve 21, a second high-pressure valve 22, and a heating tube 23. The first high-pressure valve 21 connects one end of the heating tube 23 to the water circuit board assembly 14, and the second high-pressure valve 22 connects the other end of the heating tube 23 to the water circuit board assembly 14. The syringe pump 19 drives the liquid in the ultraviolet digestion tube 20 into the heating tube 23 for reaction. The first high-pressure valve 21 and the second high-pressure valve 22 provide the necessary pressure for the liquid to react in the heating tube 23. The heating tube 23 can enhance the rapid reaction capability of the liquid, further accelerating the analysis efficiency of water samples.

[0033] In an optional embodiment, the nutrient analyzer 100 further includes a power supply module 24 for supplying power to the nutrient analyzer 100. The power supply module 24 can be an external power supply or a built-in power supply module, preferably a lithium battery pack, which is electrically connected to the first controller 11. By using a lithium battery pack for the power supply module, the nutrient analyzer 100 can be used anywhere without geographical limitations.

[0034] In an optional embodiment, the nutrient analyzer 100 further includes a housing 25, which includes an upper housing 251, a middle housing 252, and a lower housing 253. The lower housing 253 and the middle housing 252 enclose a first chamber, and the upper housing 251 and the middle housing 252 enclose a second chamber. The first controller 11, the wireless communication module 13, the water circuit board assembly 14, the solenoid valve assembly 15, the reagent tube assembly 16, the syringe pump 17, the buffer tube 18, and the colorimetric detection device 19 are all built into the first chamber. The middle housing 252 has a first window 2521, through which part of the touch screen 12 is exposed in the second chamber. The touch screen 12 is tilted. By setting the touch screen 12 to be tilted, it is convenient for the operator to view and conforms to ergonomics. For example, the tilt angle of the touch screen 12 is any angle within the range of 10°-45°.

[0035] In an optional embodiment, the outer surface of the housing 25 is powder-coated, which provides a pleasant tactile experience and enhances the user experience.

[0036] In an alternative embodiment, the housing 25 is made of engineering ABS plastic, which is lightweight and does not add to the weight of the device. In addition, ABS plastic has good waterproof properties, which allows the nutrient analyzer 100 to be used in situations where waterproofing is required.

[0037] Please see Figure 6-7In an optional embodiment, the nutrient analyzer 100 further includes a reagent compartment 26 installed in the lower housing 253. The reagent compartment 26 has an open top, and the middle housing 252 also has a second window 2522 through which the reagent tube assembly 16 is placed in the reagent compartment 26. The reagent tube assembly 16 can be placed entirely into the reagent compartment 26 through the second window 2522, making it convenient to put in and take out.

[0038] In an optional embodiment, the reagent tube assembly 16 includes a tube holder 161 and a plurality of reagent tubes 162. The tube holder 161 has a plurality of openings 1611. The reagent tube 162 includes a reagent tube body 1621 and a support portion 1622 disposed on the top of the reagent tube body 1621. The reagent tube body 1621 passes through the openings 1611, and the support portion 1622 is engaged with the edge of the openings 1611.

[0039] In an optional embodiment, the opening 1611 has a trapezoidal outline, and both the reagent tube body 1621 and the support portion 1622 have trapezoidal cross-sectional outlines. Multiple support portions 1622 are arranged in a row, with their orientations alternating between positive and negative. The orientation refers to the direction in which the trapezoidal outline expands or contracts. With this design, when multiple support portions 1622 are arranged in a row, the surfaces between the support portions 1622 can fit together, thus preventing the entire row of reagent tubes 162 from shaking and allowing the reagent tubes 162 to be stably housed in the reagent compartment 26.

[0040] Please see Figure 8-9 In an optional embodiment, the nutrient analyzer 100 further includes a reagent compartment cover 27 and a damping shaft 28. The reagent compartment cover 27 is connected to the intermediate housing 252 or the lower housing 253 via the damping shaft 28. By connecting the reagent compartment cover 27 to the intermediate housing 252 or the lower housing 253 via the damping shaft 28, the reagent compartment cover 27 can be fixed at a preset angle after being opened. That is, the opened reagent compartment cover 27 can be used as a placement platform, preventing water samples, pure water, and other components from being placed on the ground and becoming contaminated, thus affecting the test results.

[0041] In an optional embodiment, the reagent compartment cover 27 is connected to the intermediate housing 252. For example, the intermediate housing 252 has a mounting portion 2523 protruding on the side facing the upper housing 251, and the damping shaft 28 is mounted on the mounting portion 2523. The reagent compartment cover 27 is rotatably connected to the damping shaft 28.

[0042] Please refer to it again. Figure 5 In an optional embodiment, the nutrient analyzer 100 further includes a cadmium column 29, which is connected to two ports of the water circuit board assembly 14 and is used to reduce nitrates to nitrites.

[0043] In an optional embodiment, the colorimetric detection device 19 includes a cuvette, a light source, a coupling lens, and a photoelectric converter. The light source and the coupling lens are respectively disposed on opposite sides of the cuvette. The photoelectric converter is connected to the first controller 11 and disposed at the light emitting end of the coupling lens. The cuvette is connected to one port of the water circuit board assembly.

[0044] In an optional embodiment, the light source is a multi-wavelength LED light source. By switching the wavelength, it can be used to detect different types of nutrients. The nutrient analyzer provided in this embodiment can be used to analyze at least four types of nutrients: nitrate, nitrite, ammonia nitrogen, and phosphate.

[0045] Please see Figure 5-6 as well as Figure 10 In an optional embodiment, the nutrient analyzer 100 further includes a support plate 30, which is mounted on the bottom shell 253. The support plate 30 is generally rectangular. The motherboard 31, the first controller 11, the touch screen 12, the wireless communication module 13, the water circuit board assembly 14, the solenoid valve assembly 15, the syringe pump 17, the ultraviolet digestion tube 20, the heating tube 23, the lithium battery pack 24, the first high-pressure valve 21, the second high-pressure valve 22, the reagent chamber 26, and the colorimetric detection device 19 are arranged on the support plate 30 as follows:

[0046] The carrier plate 30 is divided into a first region A, a second region B, a third region C, and a fourth region D by a first dashed line S1 along the length direction X and a second dashed line S2 along the width direction Y. Regions A and B are arranged along the length direction, as are regions C and D. Regions A and C are arranged along the width direction, as are regions B and D. The wireless communication module 13 and the lithium battery pack 24 are arranged side-by-side along the length direction X in region A. The reagent compartment 26 is located in region B, and the reagent tube assembly 16 is built into the reagent compartment 26. The main board 31 is located in region C. The first controller 11, the ultraviolet digestion tube 20, and the heating tube 23 are located on the side of the main board 31 facing away from the carrier plate 30. The ultraviolet digestion tube 20 and the heating tube 23 are arranged side-by-side along the width direction Y. The solenoid valve assembly 15, the water circuit board assembly 14, the first high-pressure valve 21, the second high-pressure valve 22, and the colorimetric detection device 19 are located in the fourth region D. The solenoid valve assembly 15, the first high-pressure valve 21, and the second high-pressure valve 22 are arranged side by side in the length direction X. The water circuit board assembly 14 is located on the side of the solenoid valve assembly 15 away from the support plate 30. The colorimetric detection device 19 is arranged side by side with the first high-pressure valve 21 and the second high-pressure valve 22 in the width direction Y. The injection pump 17 is located between the lithium battery assembly 24 and the main board 31, and the second controller 32 is installed at the rear end of the injection pump 17.

[0047] With the above layout, the entire nutrient analyzer 100 has a compact structure and a volume of less than 0.01 cubic meters, making it very easy to carry.

[0048] In an optional embodiment, the detection method of the nutrient analyzer 100 is as follows:

[0049] The operator collects water samples and puts them into a sample cup. One end of the tubing on the nutrient analyzer 100 is inserted into the sample cup. At the same time, the operator confirms the preparation of reagents, pure water, and waste liquid collection device.

[0050] Turn on the nutrient analyzer 100 and set it to analyze a single nutrient parameter or multiple nutrient parameters.

[0051] After the test is started, the syringe pump 19 draws pure water or water sample to rinse the system. The number of rinsing times is preset.

[0052] After rinsing, syringe pump 19 draws water samples and performs initial absorbance detection;

[0053] Subsequently, the syringe pump 19 injects water sample into the buffer tube 18 and draws reagent 1 into the buffer tube 18 for mixing; the first high-pressure valve 21 delivers the liquid in the buffer tube 18 to the ultraviolet digestion tube 20 for a preset reaction time; the second high-pressure valve 22 delivers the liquid in the ultraviolet digestion tube 20 to the heating tube 23 for a preset constant temperature reaction time.

[0054] After the reaction is completed, the syringe pump 19 draws the liquid from the heating tube 23 into the colorimetric detection device 19 to obtain the absorbance of the mixture; based on the obtained absorbance value, the concentration value of the nutrients is analyzed and uploaded to the remote terminal via the wireless communication module 13; the mixture is discharged into the waste liquid collection bag to complete the detection.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A nutrient salt analyzer for detecting the nutrient salt content of a water sample, characterized in that: The nutrient salt analyzer includes a first controller, a touch screen, a wireless communication module, a waterway board assembly, a solenoid valve assembly, a reagent tube assembly, a syringe pump, a buffer tube, a colorimetric detection device and a main board; the solenoid valve assembly, the reagent tube assembly and the buffer tube are all connected to the waterway board assembly; the syringe pump connects the waterway board assembly and the buffer tube, and the syringe pump is used to drive the water sample and the reagent in the reagent tube assembly into the buffer tube for mixing reaction, and transport the reacted mixed solution to the colorimetric detection device for absorbance detection; The touch screen, the wireless communication module, the waterway plate assembly, the solenoid valve assembly, the injection pump and the colorimetric detection device are all electrically connected to the first controller through the main board; the first controller is used to receive the touch signal of the touch screen to control the waterway plate assembly, the solenoid valve assembly, the injection pump and the colorimetric detection device to automatically operate to detect the nutrient salt content of the water sample, and the wireless communication module is used to transmit the data detected by the colorimetric detection device to the terminal; The nutrient salt analyzer also includes a carrying plate, which is divided into a first area, a second area, a third area and a fourth area by a first imaginary line along the length direction and a second imaginary line along the width direction. The first area and the second area are arranged along the length direction, the third area and the fourth area are arranged along the length direction, the first area and the third area are arranged along the width direction, the second area and the fourth area are arranged along the width direction, the wireless communication module is arranged in the first area, the reagent tube assembly is arranged in the second area, the main board is arranged in the third area, the first controller is arranged on the side of the main board facing away from the carrying plate, the solenoid valve assembly, the waterway plate assembly and the colorimetric detection device are arranged in the fourth area, and the waterway plate assembly is arranged on the side of the solenoid valve assembly away from the carrying plate.

2. The nutrient salt analyzer according to claim 1, characterized in that: The nutrient salt analyzer also includes an ultraviolet digestion tube, which includes an ultraviolet lamp source and an ultraviolet lamp tube. The ultraviolet lamp tube is connected to the waterway plate assembly, the ultraviolet lamp source is installed on the ultraviolet lamp tube, the inner wall of the ultraviolet lamp tube is provided with a reflective layer, and the injection pump drives the liquid in the buffer tube to enter the ultraviolet digestion tube for reaction.

3. The nutrient salt analyzer according to claim 2, characterized in that: The nutrient salt analyzer also includes a first high-pressure valve, a second high-pressure valve and a heating tube, the first high-pressure valve connects one end of the heating tube and the waterway plate assembly, the second high-pressure valve connects the other end of the heating tube and the waterway plate assembly, and the injection pump drives the liquid in the ultraviolet digestion tube to enter the heating tube for reaction.

4. The nutrient salt analyzer according to claim 1, characterized in that: The nutritional salt analyzer also includes a lithium battery pack, which is electrically connected to the first controller and is used to power the nutritional salt analyzer.

5. The nutrient salt analyzer according to claim 1, characterized in that: The nutrient salt analyzer also includes a shell, which includes an upper shell, an intermediate shell and a lower shell, the lower shell and the intermediate shell are enclosed to form a first chamber, the upper shell and the intermediate shell are enclosed to form a second chamber, and the first controller, the wireless communication module, the waterway plate assembly, the solenoid valve assembly, the reagent tube assembly, the injection pump, the buffer tube and the colorimetric detection device are all built in the first chamber; The intermediate shell is provided with a first window, the touch screen is partially exposed in the second chamber through the first window, and the touch screen is arranged in an inclined manner.

6. The nutrient salt analyzer according to claim 5, characterized in that: The nutrient salt analyzer also includes a reagent chamber installed on the lower shell, the top of the reagent chamber is open, and the intermediate shell is also provided with a second window, and the reagent tube assembly is placed in the reagent chamber through the second window.

7. The nutrient salt analyzer according to claim 6, characterized in that: The reagent tube assembly includes a tube rack and a plurality of reagent tubes, the tube rack is provided with a plurality of openings, the reagent tube includes a reagent tube body and a supporting portion provided on the top of the reagent tube body, the reagent tube body passes through the opening, and the supporting portion is clamped on the edge of the opening.

8. The nutrient salt analyzer according to claim 7, characterized in that: The profile of the opening is a trapezoid, the cross-sectional profile of the supporting portion is a trapezoid, a plurality of the supporting portions are arranged in a row, and the orientations of the plurality of the supporting portions are alternately arranged in a positive and a negative direction.

9. The nutrient salt analyzer according to claim 5, characterized in that: The nutrient salt analyzer further comprises a reagent compartment cover and a damping shaft, and the reagent compartment cover is connected to the intermediate housing or the lower housing via the damping shaft.

10. The nutrient salt analyzer according to claim 1, characterized in that: The nutrient salt analyzer further comprises a cadmium column connected to two ports of the waterway plate assembly, and the cadmium column is used to reduce nitrate to nitrite.

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