Ammonia nitrogen detection device applied to rain-derived river

Abstract

The utility model discloses an ammonia nitrogen detection device applied to a rain-derived river, which relates to the technical field of hydrology and water resource research equipment and comprises a floating main body with an accommodating cavity and a detection device, a controller and power supply equipment are arranged on the floating main body; the detection device is arranged in the accommodating cavity; the detection device comprises a water feeder, a detection reactor and a purifier which are sequentially arranged in the vertical direction; the detection reactor is connected with an alkaline reagent adder, and the alkaline reagent adder is used for adding an alkaline reagent for ammonia gas sensitive electrode method detection into the detection reactor; an ammonia gas sensitive electrode, a temperature detection element and a PH detection element are arranged in the detection reactor; the purifier is connected with a purifying agent adder; and a bottom outlet of the purifier is higher than the liquid level of external water. Intelligent monitoring of ammonia nitrogen can be realized, the detection cost is reduced, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of hydrological and water resources research equipment technology, and in particular to an ammonia nitrogen detection device for rain-fed rivers. Background Technology

[0002] Ammonia nitrogen is a common pollutant in water bodies, typically originating from agricultural discharges, industrial wastewater, and domestic sewage. Therefore, accurate and rapid monitoring of ammonia nitrogen concentrations in water is essential for protecting water resources and the environment.

[0003] Traditional ammonia nitrogen detection methods include chemical analysis methods, such as direct determination and distillation-titration. These methods typically require significant amounts of reagents and manual operation time, and may generate harmful substances during the process. To address these issues of traditional ammonia nitrogen detection methods, there is an urgent need for a more intelligent, rapid-response, and online monitoring device for rainwater-sourced rivers to meet the increasingly complex water quality monitoring requirements. Utility Model Content

[0004] The purpose of this invention is to provide an ammonia nitrogen detection device for rain-fed rivers, in order to solve the problems existing in the prior art, realize intelligent monitoring of ammonia nitrogen, reduce detection costs, and improve detection efficiency.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This invention provides an ammonia nitrogen detection device for rain-fed rivers, comprising a floating body and a detection device; the density of the floating body is less than the density of water in the water environment to be tested; the floating body has a accommodating cavity; a controller and a power supply are installed on the floating body; the detection device is disposed within the accommodating cavity; the detection device includes a water inlet, a detection reactor, and a purifier arranged sequentially in a vertical direction; the water inlet of the water inlet is connected to the water outside the floating body, and the water outlet of the water inlet is connected to the inside of the detection reactor; an alkaline reagent adder is connected to the detection reactor, which is used to add alkaline reagent for ammonia detection by the ammonia-sensitive electrode method; and the detection reactor is equipped with an ammonia-sensitive electrode for monitoring electrode position and a temperature detection electrode. The system includes a temperature detection element and a pH detection element for detecting pH values; the bottom outlet of the detection reactor is connected to the inlet of the purifier, and a first electrically controlled valve is provided at the bottom outlet of the detection reactor; a purifying agent additive is connected to the purifier, which is used to add a neutralizing agent to the purifier for neutralizing the liquid discharged from the detection reactor into the purifier; the bottom outlet of the purifier is higher than the external water level, and a second electrically controlled valve is provided at the bottom outlet of the purifier; the controller is communicatively connected to the water inlet, the alkaline reagent additive, the purifying agent additive, the ammonia-sensitive electrode, the temperature detection element, the pH detection element, the first electrically controlled valve, and the second electrically controlled valve, and the power supply equipment is used to supply electrical energy to each component.

[0007] Preferably, at least one fixing device is provided at the lower end of the floating body; the fixing device includes a flexible connector and a bottom weight; one end of the flexible connector is fixedly connected to the floating body, and the other end of the flexible connector is fixedly connected to the bottom weight; the density of the bottom weight is greater than the density of water in the aquatic environment in which the floating body floats.

[0008] Preferably, the bottom weight has a water-containing cavity and a water inlet communicating with the water-containing cavity, and an opening and closing door is provided at the water inlet, which can close or open the water inlet.

[0009] Preferably, the detection reactor is further connected to a cleaner, which is used to supply cleaning solution into the detection reactor.

[0010] Preferably, a pressure balancing device is provided in the accommodating cavity; the pressure balancing device includes a gas cylinder and a pressure sensor; the opening and closing valve of the gas cylinder outlet and the pressure sensor are both communicatively connected to the controller.

[0011] Preferably, the water inlet includes an inlet pipe, a water pump, and a measuring tank; one end of the inlet pipe is open to communicate with the water environment in which the floating body floats; the other end of the inlet pipe is open to communicate with the inlet of the water pump, and the outlet of the water pump is open to communicate with the inside of the measuring tank; and the measuring tank is provided with a pressure balance hole that communicates with the accommodating cavity.

[0012] Preferably, a filter is provided on the water inlet pipe, and the water in the water inlet pipe enters the water inlet of the water pump after being filtered by the filter.

[0013] Preferably, an anti-collision protective layer is fixedly provided on the circumferential outer wall of the floating body.

[0014] Preferably, the power supply equipment includes a photovoltaic panel and a storage battery. The photovoltaic panel is mounted on the floating body above the water surface of the water environment to be tested. The photovoltaic panel is electrically connected to the storage battery, and the storage battery is used to supply electrical energy.

[0015] Preferably, an anemometer is fixedly installed at the upper end of the floating body.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] This invention provides an ammonia nitrogen detection device for rain-fed rivers. The device opens the inlet via a controller, allowing the water sample to enter and flow into the detection reactor. The controller then triggers an alkaline reagent adder to add an appropriate amount of alkaline reagent to the reactor, meeting the conditions for ammonia detection using the ammonia-sensitive electrode method. The ammonia-sensitive electrode, temperature detection element, and pH detection element then begin operating, monitoring electrode potential, temperature, and pH values ​​in real time and transmitting this data to the controller. The controller analyzes and processes this data according to a preset algorithm and model to determine the ammonia nitrogen concentration. The entire device enables automated and intelligent ammonia nitrogen monitoring, thereby reducing detection costs and improving efficiency. The controller precisely controls the amount of reagent added by the alkaline reagent adder and the purifying agent adder, ensuring accurate addition of the appropriate amount of alkaline reagent and neutralizing agent, thus avoiding reagent waste. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1A schematic diagram of the overall structure of the ammonia nitrogen detection device for rain-fed rivers provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the detection device in the ammonia nitrogen detection device for rain-fed rivers provided by this utility model.

[0021] In the picture:

[0022] 10-Floating main body; 11-Anemometer; 12-Controller; 13-Photovoltaic panel; 14-Anti-collision protective layer; 15-Metal support leg; 16-Arc-shaped rod; 17-Flexible connector; 18-Bottom weight; 19-Accommodation cavity;

[0023] 20-Inlet pipe; 21-Filter screen; 22-Water pump; 23-Liquid measuring tank; 231-Third electrically controlled valve; 232-Connecting pipe; 24-Detection reactor; 241-Alkaline reagent adder; 242-Washer; 243-First electrically controlled valve; 25-Purifier; 251-Purifying agent adder; 252-Second electrically controlled valve; 253-Drain pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The purpose of this invention is to provide an ammonia nitrogen detection device for rain-fed rivers, in order to solve the problems existing in the prior art, realize intelligent monitoring of ammonia nitrogen, reduce detection costs, and improve detection efficiency.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] This embodiment provides an ammonia nitrogen detection device for rain-sourced rivers, primarily but not limited to the automatic detection of ammonia nitrogen in rain-sourced rivers, such as... Figure 1 and Figure 2As shown, the device includes a floating body 10 and a detection device. The density of the floating body 10 is less than the density of water in the water environment to be tested. The floating body 10 has a accommodating cavity 19. A controller 12 and a power supply are installed on the floating body 10. The detection device is installed inside the accommodating cavity 19. The detection device includes a water inlet, a detection reactor 24, and a purifier 25 arranged sequentially in a vertical direction. The water inlet of the water inlet can communicate with the water outside the floating body 10, and the water outlet of the water inlet is connected to the inside of the detection reactor 24. An alkaline reagent adder 241 is connected to the detection reactor 24. The alkaline reagent adder 241 is used to add alkaline reagent for ammonia-sensitive electrode detection into the detection reactor 24. The detection reactor 24 is equipped with an ammonia-sensitive electrode for monitoring electrode position, a temperature detection element for detecting temperature, and a device for... A pH detection element is provided to detect pH value; the bottom outlet of the detection reactor 24 is connected to the inlet of the purifier 25, and a first electrically controlled valve 243 is provided at the bottom outlet of the detection reactor 24; a purification agent additive 251 is connected to the purifier 25, which is used to add a neutralizing agent to the purifier 25 for neutralization reaction of the liquid discharged from the detection reactor 24 into the purifier 25; the bottom outlet of the purifier 25 is higher than the external water level, and a second electrically controlled valve 252 is provided at the bottom outlet of the purifier 25; the controller 12 is communicatively connected to the water inlet, alkaline reagent additive 241, purification agent additive 251, ammonia sensitive electrode, temperature detection element, pH detection element, first electrically controlled valve 243 and second electrically controlled valve 252, and the power supply equipment is used to supply power to each component.

[0029] The controller 12 opens the inlet, allowing the external water sample to enter and flow into the detection reactor 24. Then, the controller 12 triggers the alkaline reagent adder 241 to add an appropriate amount of alkaline reagent to the detection reactor 24 to meet the conditions for ammonia-sensitive electrode detection. The ammonia-sensitive electrode, temperature detection element, and pH detection element then begin operating, monitoring electrode potential, temperature, and pH values ​​in real time and transmitting this data to the controller 12. The controller 12 analyzes and processes this data according to a preset algorithm and model to determine the ammonia nitrogen concentration. The entire device can automatically and intelligently monitor ammonia nitrogen, thereby reducing detection costs and improving detection efficiency. The controller 12 precisely controls the reagent addition amounts of the alkaline reagent adder 241 and the purifying agent adder 251, accurately adding appropriate amounts of alkaline reagent and neutralizing agent to avoid reagent waste.

[0030] The following are the relevant settings instructions for the detection device:

[0031] The ammonia nitrogen detection method in this embodiment uses the ammonia-sensitive electrode method. This method has high detection efficiency, low pollution, and can maintain stable detection quality in rain-fed river scenarios. After the sensitive electrode outputs values ​​such as electrode potential, temperature, and pH, the ammonia nitrogen content in the measured water sample is calculated and fitted using a temperature compensation model, which has high accuracy and real-time performance.

[0032] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 As shown, the water inlet includes an inlet pipe 20, a water pump 22, and a measuring tank 23; one end of the inlet pipe 20 is open to communicate with the water environment in which the floating body 10 floats; the other end of the inlet pipe 20 is open to communicate with the inlet of the water pump 22, and the outlet of the water pump 22 is open to communicate with the inside of the measuring tank 23; and the measuring tank 23 is provided with a pressure balance hole that communicates with the accommodating cavity 19.

[0033] Specifically, the appropriate model and power of the water pump 22 can be selected according to the needs.

[0034] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 As shown, a filter is installed on the water inlet pipe 20, and the water in the water inlet pipe 20 enters the water inlet of the water pump 22 after being filtered by the filter.

[0035] Specifically, the filter can be filter screen 21, used to filter impurities.

[0036] Specifically, a liquid level sensor is installed inside the liquid volume tank 23. The liquid level sensor is connected to the controller 12 and controls the injection volume by setting the rated pressure to ensure that the volume of the water to be tested is kept constant.

[0037] Specifically, the volumetric liquid tank 23 is connected to the detection reactor 24 via a connecting pipe 232, and a third electrically controlled valve 231 is installed on the connecting pipe 232.

[0038] Specifically, the detection reactor 24 includes a barrel body and a lid. The lid is equipped with a water inlet for the volumetric liquid tank 23, two reagent inlets, and three electrode fixing positions. One of the two reagent inlets is used to connect to an alkaline reagent adder 241, and the other is used to connect to a cleaner 242. The three electrodes are a temperature electrode (temperature sensing element), a pH electrode (pH sensing element), and an ammonia-sensitive electrode. The temperature electrode must meet the requirements of good linearity, low self-heating coefficient, and high resolution to meet the temperature detection accuracy requirements of this device. The pH electrode must meet the requirements of fast transmission rate, good scalability, pH measurement range of 0-14, and temperature range of 0-60℃. The pH electrode is made of ABS material, which has good corrosion resistance and is easy to clean. The ammonia-sensitive electrode probe is made of plexiglass, with a temperature range of 5-45℃ and a wide ammonia nitrogen measurement range. This electrode uses a BNC interface, which has strong anti-interference ability and good noise shielding ability.

[0039] Specifically, the alkaline reagent adder 241 includes a peristaltic pump and a reagent bottle; the cleaning agent includes a peristaltic pump and a reagent bottle.

[0040] Specifically, alkaline reagents are also known as alkalizing shielding agents. In current experimental methods, NaOH solution is often used as the alkalizing shielding agent to effectively avoid interference from metal ions in the detection of ammonia nitrogen.

[0041] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2 As shown, a cleaner 242 is also connected to the detection reactor 24. The cleaner 242 is used to supply cleaning solution (such as citric acid) into the detection reactor 24. It is used to clean the detection reactor 24 after the ammonia nitrogen electrolysis detection is completed, so as to avoid the data being affected during the next detection.

[0042] Specifically, the purifier additive 251 includes a peristaltic pump and a reagent bottle made of polyethylene material. The peristaltic pump tube is a BPT tube with a flow rate of 20-110 ml / min and an operating temperature of 0-40℃. Waste liquid detection can be performed using a pH sensor with a 5m pH electrode wire that can achieve temperature compensation. The bottom outlet of the purifier 25 is equipped with a second electrically controlled valve 252 with a diameter of 25mm, the end of which is a water outlet connected to the river. The reagent bottle contains a carbonic acid solution. Carbonic acid is easily decomposed and has low hazard. It is used to neutralize the strongly alkaline electrolyte after electrolysis, reducing pollution to the river.

[0043] Specifically, the purifier 25 is used to purify the waste liquid produced by the detection reactor 24, effectively neutralizing the waste liquid to achieve the pH value and composition that meet the discharge requirements, thereby reducing the impact on the target river.

[0044] Specifically, the bottom outlet of the purifier 25 is connected to a drain pipe 253, and a second electrically controlled valve 252 is installed on the drain pipe 253.

[0045] Specifically, the volumetric liquid tank 23, detection reactor 24, purifier 25, and reagent bottles located in the accommodating cavity 19 are all connected, so that each additive or other additive can be added normally under a balanced gas pressure.

[0046] Specifically, the cavity 19 is also equipped with filler material for fixing the internal components, thereby improving the stability of each component.

[0047] The following are the settings instructions for the floating main body 10:

[0048] Specifically, the upper end of the floating body 10 is fixed with an anemometer 11 and a controller 12 via a fixed bracket.

[0049] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, an anemometer 11 is fixedly installed at the upper end of the floating body 10.

[0050] Specifically, it can use a small anemometer 11 to monitor wind speed, wind direction, rainfall, temperature, humidity, and atmospheric pressure. The sampling frequency is 10Hz, the wind direction is 0-359.9° (accuracy is 0.1°), the operating temperature is -30℃~70℃, and the operating voltage is 24V.

[0051] Specifically, controller 12 is a PLC data acquisition device, which is used to record, process, and transmit data during detection, providing a data source for ammonia nitrogen detection.

[0052] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the power supply equipment includes a photovoltaic panel 13 and a storage battery. The photovoltaic panel 13 is installed on the floating body 10 above the water surface of the water environment to be tested. The photovoltaic panel 13 is electrically connected to the storage battery, and the storage battery is used to supply electrical energy.

[0053] Specifically, the photovoltaic panel 13 utilizes solar energy to provide a continuous power supply to the device (such as the water pump 22, various peristaltic pumps, various electrodes, the first electrically controlled valve 243, the second electrically controlled valve 252, etc.), enabling it to meet the needs of long-term testing. Furthermore, the photovoltaic panel 13 is connected to the battery via a waterproof data cable. The battery can be placed inside the accommodating cavity 19 of the floating body 10 to ensure the sealing and waterproofing of the accommodating cavity 19. The photovoltaic panel 13 is square, distributed on the circumferential sidewalls of the floating body 10, and located above the anti-collision protective layer 14.

[0054] Specifically, the floating body 10 includes an external anti-collision layer made of polyurethane and an internal structural support made of steel. Polyurethane is a material with high load-bearing capacity, strong compressive strength and antifouling properties, which can bring buoyancy and stability to it.

[0055] In the optional solutions of this embodiment, a pressure balancing device is preferably provided in the accommodating cavity 19; the pressure balancing device includes a gas cylinder and a pressure sensor; the opening and closing valve of the gas cylinder outlet and the pressure sensor are both communicatively connected to the controller 12.

[0056] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, an anti-collision protective layer 14 is fixedly installed on the outer circumferential wall of the floating body 10.

[0057] Specifically, the anti-collision protective layer 14 can be an inflatable membrane. The thickness after inflation can be set according to the usage scenario. The installation needs to meet the impact of gravel, debris and debris in rain-generated scenarios, so that the device can adapt to the scenario of large fluctuations in rain-generated rivers.

[0058] Specifically, the inflatable membrane uses custom-sized air spring shock absorbers and rubber industrial airbags for shock absorption (maximum radius 1.5m, height 1m). It can withstand working temperatures from -53℃ to 70℃, is resistant to compressed air with oil stains, dust, alkali and acid cleaning agents, is not sensitive to atmospheric effects, and is resistant to ozone.

[0059] Specifically, the inflatable membrane enhances the stability and wind resistance of the entire device, ensuring its normal operation under different weather conditions.

[0060] Specifically, a bottom fixing frame is fixedly installed at the lower end of the rafting body. The bottom fixing frame includes four metal legs 15. Each metal leg 15 is evenly distributed around the vertical axis of the rafting body, and adjacent metal legs 15 are fixedly connected by an arc-shaped rod 16 to enhance the overall structural stability.

[0061] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, at least one fixing device is provided at the lower end of the floating body 10; the fixing device includes a flexible connector 17 and a bottom weight 18; one end of the flexible connector 17 is fixedly connected to the floating body 10, and the other end of the flexible connector 17 is fixedly connected to the bottom weight 18; the density of the bottom weight 18 is greater than the density of water in the water environment in which the floating body 10 floats.

[0062] Specifically, the flexible connector 17 can be a flexible steel wire rope, which needs to be flexible and adaptable to the rise and fall of river water level, strong enough to withstand the impact of high-velocity water flow in rain-fed rivers, and the steel wire rope material is corrosion resistant and can meet the conditions for long-term use in river water.

[0063] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 2As shown, a water-containing cavity and a water inlet connected to the water-containing cavity are provided on the bottom weight 18. An opening and closing door is provided at the water inlet, which can close or open the water inlet.

[0064] Specifically, the bottom weight 18 is designed as a hollow structure, which can reduce the weight of the entire device during transportation, making it easier to transport. In the application scenario, water from the water environment to be tested can be injected into its hollow part to increase its weight, thereby making it sink more stably to the bottom of the river and providing a more stable and reliable fixation for the floating body 10.

[0065] Specifically, the bottom weight 18 is made of metal, which is corrosion-resistant, has high density, and its weight is suitable for the rain-fed river environment in which it is used, thus meeting the requirements for stable fixation and maintaining the stability of the device.

[0066] Specifically, the lower end of the floating body 10 is connected to multiple anchors, and at low water levels, the steel wire ropes of each anchor are in a slack state with a relatively long length, meaning that the floating body 10 can move within a certain range in the water environment to be tested. In this way, when the rainy season arrives and the water level rises, the floating body 10 can rise with the water level. At this time, each steel wire rope changes its posture accordingly, forming a tighter state, thereby adapting to the rise of the floating body 10 and making it more adaptable to the rise and fall of the water level.

[0067] Regarding other related settings:

[0068] Specifically, necessary sealing measures are installed at each pipeline connection point, such as the sealing at the connection between the water pump 22 and the connected water pipe.

[0069] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An ammonia nitrogen detection device for rain-fed rivers, characterized in that: Includes the floating body and detection device; The density of the floating body is less than the density of water in the aquatic environment to be detected; the floating body has a accommodating cavity; the floating body is equipped with a controller and a power supply device; The detection device is disposed within the accommodating cavity; The detection device includes a water inlet, a detection reactor, and a purifier arranged vertically in sequence. The water inlet of the water inlet is connected to the water outside the floating body, and the water outlet of the water inlet is connected to the inside of the detection reactor. An alkaline reagent adder is connected to the detection reactor, which is used to add alkaline reagent for detection by the ammonia-sensitive electrode method. The detection reactor is equipped with an ammonia-sensitive electrode for monitoring electrode position, a temperature detection element for detecting temperature, and a pH detection element for detecting pH value. The bottom outlet of the detection reactor is connected to the inlet of the purifier, and a first electrically controlled valve is provided at the bottom outlet of the detection reactor. A purifier additive is connected to the purifier, and the purifier additive is used to add a neutralizing agent to the purifier for neutralizing the liquid discharged from the detection reactor into the purifier. The bottom outlet of the purifier is higher than the external water level, and a second electrically controlled valve is provided at the bottom outlet of the purifier. The controller is communicatively connected to the water inlet, the alkaline reagent adder, the purifying agent adder, the ammonia-sensitive electrode, the temperature detection element, the pH detection element, the first electrically controlled valve, and the second electrically controlled valve, and the power supply equipment is used to supply electrical energy to each component.

2. The ammonia nitrogen detection device for rain-fed rivers according to claim 1, characterized in that: At least one anchor is provided at the lower end of the floating body; The anchor includes a flexible connector and a bottom weight; one end of the flexible connector is fixedly connected to the floating body, and the other end of the flexible connector is fixedly connected to the bottom weight; the density of the bottom weight is greater than the density of water in the aquatic environment in which the floating body floats.

3. The ammonia nitrogen detection device for rain-fed rivers according to claim 2, characterized in that: The bottom weight has a water-containing cavity and a water inlet communicating with the water-containing cavity. The water inlet is provided with an opening and closing door, which can close or open the water inlet.

4. The ammonia nitrogen detection device for rain-fed rivers according to claim 1, characterized in that: The detection reactor is also connected to a cleaner, which is used to supply cleaning solution into the detection reactor.

5. The ammonia nitrogen detection device for rain-fed rivers according to claim 1, characterized in that: A pressure balancing device is provided inside the accommodating cavity; The pressure balancing device includes a gas cylinder and a pressure sensor; the opening and closing valve of the gas cylinder outlet and the pressure sensor are both communicatively connected to the controller.

6. The ammonia nitrogen detection device for rain-fed rivers according to claim 5, characterized in that: The water inlet device includes an inlet pipe, a water pump, and a measuring tank; One end of the water inlet pipe is open to communicate with the water environment in which the floating body floats; the other end of the water inlet pipe is open to communicate with the inlet of the water pump, and the outlet of the water pump is open to communicate with the inside of the measuring tank; and the measuring tank is provided with a pressure balance hole that communicates with the accommodating cavity.

7. The ammonia nitrogen detection device for rain-fed rivers according to claim 6, characterized in that: A filter is installed on the water inlet pipe, and the water in the water inlet pipe enters the water inlet of the water pump after being filtered by the filter.

8. The ammonia nitrogen detection device for rain-fed rivers according to claim 1, characterized in that: A collision protection layer is fixedly installed on the outer circumferential wall of the floating body.

9. The ammonia nitrogen detection device for rain-fed rivers according to claim 1, characterized in that: The power supply equipment includes a photovoltaic panel and a storage battery. The photovoltaic panel is installed on the floating body above the water surface of the water environment to be tested. The photovoltaic panel is electrically connected to the storage battery, and the storage battery is used to supply electrical energy.

10. The ammonia nitrogen detection device for rain-fed rivers according to claim 1, characterized in that: An anemometer is fixedly installed at the upper end of the floating body.

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