Water quality ammonia nitrogen continuous monitoring device and measuring method
By designing a continuous monitoring device for water quality ammonia nitrogen including a pretreatment module and an analysis and measurement module, the problem of difficulty in achieving continuous monitoring in the prior art is solved, and continuous measurement of ammonia nitrogen content of water samples and convenient water input detection are achieved.
Patent Information
- Application Number
- CN202311336450.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-16
- Publication Date
- 2025-04-18
AI Technical Summary
The existing ammonia nitrogen content detection methods are difficult to achieve continuous monitoring and cannot be directly put into water for measurement.
A continuous monitoring device for water quality ammonia nitrogen is designed, including a pretreatment module and an analysis and measurement module. It uses ammonia gas sensitive electrode method for detection. The device is equipped with a waterproof shell and a built-in control cloud box, which can be remotely controlled and directly put into the water for continuous monitoring.
It realizes continuous measurement of ammonia nitrogen content of water samples, simple and convenient monitoring, can be directly put into water for testing, and is convenient to use.
Smart Images
Figure CN119846028A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of water quality monitoring, and in particular to a device and a method for continuously monitoring ammonia nitrogen in water quality. Background Art
[0002] Ammonia nitrogen pollution refers to the phenomenon that the concentration of ammonia and ammonia compounds in water bodies exceeds the environmental tolerance level, resulting in water pollution. The sources of ammonia nitrogen in water bodies are mainly the decomposition products of nitrogen-containing organic matter in domestic sewage by microorganisms, agricultural drainage, and industrial wastewater such as coking wastewater and synthetic ammonia fertilizer plant wastewater. Excessive ammonia nitrogen concentration in water bodies will cause eutrophication of water bodies, leading to the death of fish and other aquatic animals and destroying the water ecosystem. Therefore, it is necessary to measure the ammonia nitrogen concentration in water and evaluate the water pollution status.
[0003] At present, the commonly used methods for detecting and analyzing ammonia nitrogen content are mainly spectrophotometry, Kjeldahl nitrogen determination and ammonia sensitive electrode method. Among them, the ammonia sensitive electrode method is a simple, fast, accurate, wide detection range and environmentally friendly method for measuring ammonia nitrogen in water. The existing measuring device using the ammonia sensitive electrode method can directly measure water samples with a certain turbidity and color, and has strong anti-interference ability during measurement without additional compensation. However, the existing device is inconvenient for continuous measurement and cannot be directly put into the water body for measurement. Summary of the invention
[0004] The purpose of the present invention is to provide a water quality ammonia nitrogen continuous monitoring device and a determination method to continuously measure the ammonia nitrogen content in a water sample.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A water quality ammonia nitrogen continuous monitoring device comprises a pretreatment module and an analysis and determination module, wherein the pretreatment module comprises a filter, and the analysis and determination module comprises a heating reactor, a dual-electrode reaction tank, a first peristaltic pump and a second peristaltic pump, wherein the dual-electrode reaction tank is provided with a pH electrode and an ammonia sensitive electrode; a sample tube is connected to the liquid inlet of the filter, and a liquid outlet is connected to the liquid inlet of the heating reactor through the first peristaltic pump, and the liquid outlet of the heating reactor is connected to the liquid inlet of the dual-electrode reaction tank; a reagent tube is connected to the liquid inlet of the second peristaltic pump, and a liquid outlet is connected to the liquid inlet of the dual-electrode reaction tank.
[0006] Furthermore, it also includes a waterproof shell, a control cloud box and a communication cable; the pretreatment module, the analysis and measurement module and the control cloud box are all fixedly arranged in the waterproof shell; the control cloud box controls the opening and closing of the pretreatment module and the analysis and measurement module; the communication cable is arranged outside the waterproof shell, and one end thereof passes through the waterproof shell to connect to the control cloud box.
[0007] Furthermore, the pretreatment module also includes a filter valve, a flushing valve and a first diaphragm pump, and the filter valve and the flushing valve are both two-position three-way valves; the common end of the filter valve is connected to the liquid outlet of the filter, the normally open end is connected to the liquid inlet of the first peristaltic pump, and the normally closed end is connected to the liquid outlet of the first diaphragm pump; the common end of the flushing valve is connected to the liquid inlet of the first diaphragm pump, the normally open end is connected to the first air pipe, and the normally closed end is connected to the pure water pipe.
[0008] Furthermore, a first sensor is provided between the first peristaltic pump and the heating reactor, and a second sensor is provided between the second peristaltic pump and the dual-electrode reaction tank. Both the first sensor and the second sensor are normally-open liquid level sensors.
[0009] Furthermore, the analysis and determination module also includes an injection valve group, which includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a first joint, a second joint, a third joint, a first standard liquid tube, a second standard liquid tube, a cleaning tube and an analysis tube; the first solenoid valve, the second solenoid valve and the third solenoid valve are all two-way solenoid valves, and the first joint, the second joint and the third joint are all three-way joints. The first standard liquid tube and the second standard liquid tube are respectively connected to the two ends of the first joint through the first solenoid valve; the other end of the first joint and the cleaning tube are respectively connected to the two ends of the second joint through the second solenoid valve; the other end of the second joint and the analysis tube are respectively connected to the two ends of the third joint through the third solenoid valve; the other end of the third joint is connected to the liquid inlet of the first peristaltic pump.
[0010] Furthermore, the analysis and measurement module also includes a pipetting unit and a fourth joint, the pipetting unit includes a second diaphragm pump, a second air tube and a ball valve; the fourth joint is a three-way joint, one end of the fourth joint is connected to the liquid inlet of the heating reactor, one end is connected to the liquid outlet of the first peristaltic pump, and one end is connected to one end of the second diaphragm pump through the ball valve, and the second air tube is connected to the second diaphragm pump.
[0011] Furthermore, it also includes a first liquid storage device and a second liquid storage device; the first liquid storage device is provided with multiple, and the reagent tube, the first standard liquid tube, the second standard liquid tube and the cleaning tube are respectively connected to the liquid outlets of different first liquid storage devices; the dual-electrode reaction tank is connected to an overflow pipe on the side, and a drain pipe on the bottom, and is respectively connected to the liquid inlet of the second liquid storage device through the overflow pipe and the drain pipe; a third sensor is provided at the liquid inlet of the second liquid storage device, and a drain valve is provided on the drain pipe, the third sensor is a normally open liquid level sensor, and the drain valve is a one-way solenoid valve.
[0012] A method for determining ammonia nitrogen in water quality, using the above-mentioned continuous monitoring device for ammonia nitrogen in water quality for determination, comprises the following steps: S1, extracting a water sample through the first peristaltic pump, filtering the water sample through the filter and pumping the water sample into the heating reactor for heating, and after the heating is completed, pumping the water sample into the dual-electrode reaction tank; S2, extracting the reagent of the alkaline expelling liquid by the second peristaltic pump, and injecting the reagent into the dual-electrode reaction tank; S3, obtaining the water sample measurement potential value by measuring with the ammonia sensitive electrode , and calculate the concentration value of the water sample .
[0013] Furthermore, in step S3, the water sample measures the potential value The water sample concentration value The relationship between them is as follows: In the formula, Measure the potential value for the standard solution, is the slope of the ammonia gas sensitive electrode.
[0014] The present invention has the following beneficial effects: 1. The present invention provides a continuous monitoring device and determination method for ammonia nitrogen in water quality. When in use, water samples and reagents containing alkaline expelling liquid can be continuously extracted by a first peristaltic pump and a second peristaltic pump respectively, and injected into a double-electrode reaction tank for continuous detection, so as to achieve the purpose of continuously measuring the ammonia nitrogen content of water samples, and the monitoring is simple and convenient.
[0015] 2. The water quality ammonia nitrogen continuous monitoring device provided by the present invention has an external waterproof shell and a built-in control cloud box, which can be directly put into the water body and remotely controlled for continuous monitoring, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the structure of the present invention.
[0017] Figure 2 It is a schematic diagram of the waterway structure of the present invention.
[0018] Main symbols: 1. Pretreatment module; 11. Filter; 12. Filter valve; 13. Flushing valve; 14. First diaphragm pump; 2. Analysis and measurement module; 21. Injection valve group; 211. First solenoid valve; 212. Second solenoid valve; 213. Third solenoid valve; 214. First connector; 215. Second connector; 216. Third connector; 22. First peristaltic pump; 23. First sensor; 24. Heating reactor; 25. Liquid transfer unit; 251. Second diaphragm pump; 252. Ball valve; 26. Fourth connector; 27. Second peristaltic pump pump; 28, second sensor; 29, dual-electrode reaction tank; 291, pH electrode; 292, ammonia sensitive electrode; 293, overflow pipe; 294, drain pipe; 295, drain valve; 3, first liquid storage device; 4, second liquid storage device; 41, third sensor; 5, control cloud box; 6, communication cable; 7, waterproof shell; S1, sample tube; S2, analysis tube; R, reagent tube; Air1, first air tube; Air2, second air tube; H, pure water tube; C1, first standard liquid tube; C2, second standard liquid tube; WS, cleaning tube. DETAILED DESCRIPTION
[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.
[0020] Embodiment 1: Figure 1-2 As shown, the present invention provides a continuous monitoring device for ammonia nitrogen in water quality, which mainly includes a pretreatment module 1 and an analysis and determination module 2. Among them, the pretreatment module 1 is provided with a filter 11 for filtering water samples, and the analysis and determination module 2 includes a heating reactor 24, a dual-electrode reaction tank 29, a first peristaltic pump 22 and a second peristaltic pump 27. The dual-electrode reaction tank 29 is provided with a pH electrode 291 for real-time pH measurement and an ammonia sensitive electrode 292 for real-time potential measurement. The inlet of the filter 11 is connected to a sample tube S1 for introducing a water sample, the outlet of the filter 11 is connected to the inlet of the heating reactor 24 through the first peristaltic pump 22, the outlet of the heating reactor 24 is connected to the inlet of the dual-electrode reaction tank 29, the inlet of the second peristaltic pump 27 is connected to a reagent tube R for introducing a reagent, and the outlet is connected to the inlet of the dual-electrode reaction tank 29.
[0021] The monitoring device is provided with an IP grade 68 waterproof shell 7 and a communication cable on the outside, and a control cloud box 5 on the inside. The pre-processing module 1 and the analysis and measurement module 2 are both fixedly arranged in the waterproof shell 7. The communication cable is arranged outside the waterproof shell 7, and one end is inserted into the waterproof shell 7 to connect to the control cloud box 5, and the inserted part is waterproofly connected to the waterproof shell. The control cloud box 5 controls the opening and closing of the pre-processing module 1 and the analysis and measurement module 2, and then controls the action of the entire device, and is also responsible for remote communication connection, data acquisition, protocol conversion, etc. The control cloud box 5 has a built-in remote operation module, and can use Android / IOS / tablet / PC and other platforms to access the status of the monitoring device locally and remotely through wifi / 4G and other Internet of Things methods. Under the protection of the waterproof shell and the remote control of the control cloud box 5, the monitoring device can be directly put into the water body for continuous detection, which is convenient to use.
[0022] In the monitoring device, the pretreatment module 1 also includes a filter valve 12, a flushing valve 13 and a first diaphragm pump 14. The filter valve 12 and the flushing valve 13 are both two-position three-way solenoid valves, the common end of the filter valve 12 is connected to the liquid outlet of the filter 11, the normally open end is connected to the liquid inlet of the first peristaltic pump 22, the normally closed end is connected to the liquid outlet of the first diaphragm pump 14, the common end of the flushing valve 13 is connected to the liquid inlet of the first diaphragm pump 14, the normally open end is connected to the first air pipe Air1, and the normally closed end is connected to the pure water pipe H. The pretreatment module 1 can filter the water sample to prevent impurities in the water sample from entering and clogging the subsequent pipelines. If long-term monitoring is required, the first diaphragm pump 14 and the normally closed end of the filter valve 12 can be opened periodically, and air can be introduced through the first air pipe Air1 to blow the filter 11 to remove impurities, or the first diaphragm pump 14, the normally closed end of the filter valve 12 and the normally closed end of the flushing valve 13 can be opened, and pure water can be introduced through the pure water pipe H to flush the filter 11, so as to prevent the filter 11 from accumulating impurities and clogging due to long-term use.
[0023] In the analysis and measurement module 2, a first sensor 23 is arranged between the first peristaltic pump 22 and the heating reactor 24, and a second sensor 28 is arranged between the second peristaltic pump 27 and the dual-electrode reaction tank 29. The first sensor 23 and the second sensor 28 are both normally open liquid level sensors, which can monitor and accurately control the amount of water sample and reagent liquid drawn in real time.
[0024] An injection valve group 21 is arranged between the first peristaltic pump 22 and the pretreatment module 1, and the injection valve group 21 includes a first solenoid valve 211, a second solenoid valve 212, a third solenoid valve 213, a first connector 214, a second connector 215, a third connector 216, a first standard liquid tube C1 and a second standard liquid tube C2 for introducing a standard solution, a cleaning tube WS for introducing a cleaning liquid, and an analysis tube S2. Among them, the first solenoid valve 211, the second solenoid valve 212, and the third solenoid valve 213 are all two-way solenoid valves, and the first connector 214, the second connector 215, and the third connector 216 are all Y-type three-way pagoda connectors. The first standard liquid tube C1 and the second standard liquid tube C2 are connected to the two ends of the first joint 214 through the first electromagnetic valve 211; the remaining one end of the first joint 214 and the cleaning tube WS are connected to the two ends of the second joint 215 through the second electromagnetic valve 212; the remaining other end of the second joint 215 and the analysis tube S2 are connected to the two ends of the third joint 216 through the third electromagnetic valve 213; the remaining other end of the third joint 216 is connected to the liquid inlet of the first peristaltic pump 22. By opening and closing the first electromagnetic valve 211, the second electromagnetic valve 212, the third electromagnetic valve 213 and the first peristaltic pump 22, water samples or standard solutions can be extracted for detection, or cleaning liquid can be extracted to clean the heating reaction kettle 24 and the double electrode reaction tank 29.
[0025] The analysis and determination module 2 is also provided with a liquid transfer unit 25 and a fourth joint 26. The liquid transfer unit 25 includes a second diaphragm pump 251, a second air pipe Air2 and a straight-through ball valve 252. The fourth joint 26 adopts a Y-type three-way pagoda joint. One end of the fourth joint 26 is connected to the liquid inlet of the heating reaction kettle 24, one end is connected to the liquid outlet of the first peristaltic pump 22, and one end is connected to one end of the second diaphragm pump 251 through the ball valve 252. The second air pipe Air2 is connected to the second diaphragm pump 251. The heating reaction kettle 24 adopts a top-in and bottom-out structure, with a liquid inlet set at the top and a liquid outlet set at the bottom. After the heating reaction kettle 24 heats the water sample, the liquid transfer unit 25 can be opened, and air can be extracted through the liquid transfer unit 25 to pump the water sample heated in the heating reaction kettle 24 into the double-electrode reaction tank 29, and the water sample and the reagent are mixed evenly.
[0026] In addition, the waterproof housing 7 is also provided with a first liquid storage device 3 and a second liquid storage device 4. The first liquid storage device 3 is provided with a plurality of devices, which are mainly used to store reagents, standard solutions, cleaning solutions, etc. used for detection. Correspondingly, the reagent tube R, the first standard liquid tube C1, the second standard liquid tube C2 and the cleaning tube WS are respectively connected to the corresponding liquid outlets of the first liquid storage device 3. The second liquid storage device 4 is mainly used to store waste liquid. Since there will be excess liquid overflow in the dual-electrode reaction tank 29 during the continuous measurement process, and after the measurement is completed, the waste liquid in the dual-electrode reaction tank 29 needs to be discharged. Therefore, the dual-electrode reaction tank 29 is connected to an overflow pipe 293 on the side and a drain pipe 294 at the bottom, and the liquid inlet of the second liquid storage device 4 is connected through the overflow pipe 293 and the drain pipe 294 respectively. When the water sample is continuously measured, the waste liquid and overflow liquid generated in the dual-electrode reaction tank 29 can be centrally stored through the second liquid storage device 4, and the waste liquid in the second liquid storage device 4 can be regularly discharged.
[0027] The liquid discharge of the first liquid storage device 3 and the second liquid storage device 4 is controlled by the control cloud box 5. Similarly, a liquid discharge valve 295 is provided on the liquid discharge pipe 294 at the bottom of the dual-electrode reaction tank 29. The liquid discharge valve 295 adopts a single-way solenoid valve and is controlled by the control cloud box 5. On this basis, in order to ensure the timely discharge of waste liquid, a third sensor 41 is also provided at the liquid inlet of the second liquid storage device 4. The third sensor 41 adopts a normally open liquid level sensor, which can monitor the liquid inlet amount of the second liquid storage device 4 and assist the control cloud box 5 to control the second liquid storage device 4 to discharge waste liquid in time.
[0028] Embodiment 2: Based on the above embodiment 1, the present invention also provides a method for determining ammonia nitrogen in water quality, which is determined using the above-mentioned continuous monitoring device for ammonia nitrogen in water quality, and comprises the following steps: S11 , emptying the dual-electrode reaction tank 29 : opening the fourth solenoid valve to empty the waste liquid in the dual-electrode reaction tank 29 into the second liquid storage device 4 .
[0029] S12, sampling: open the third electromagnetic valve 213, the first peristaltic pump 22 and the heater, extract the water sample through the first peristaltic pump 22 and pump it into the heating reactor 24 for heating. During the extraction process, the water sample can be filtered through the filter 11 to effectively remove impurities in the water sample and improve the accuracy of analysis and measurement. Therefore, the monitoring device is particularly suitable for sewage detection.
[0030] After the water sample is heated, the second diaphragm pump 251 and the ball valve 252 are opened, and air is drawn into the heating reactor 24 and the dual-electrode reaction tank 29 through the second diaphragm pump 251 and the second air pipe Air2. Under the action of air, the heated water sample is transferred to the dual-electrode reaction tank 29.
[0031] S2. Turn on the second peristaltic pump 27 and the first liquid storage device 3 containing the reagent, extract the reagent containing the alkali expelling solution (the main component is NaOH) stored in the first liquid storage device 3 through the second peristaltic pump 27, and inject the reagent into the dual-electrode reaction tank 29. Under the monitoring of the pH electrode 291, adjust the pH of the water sample in the dual-electrode reaction tank 29 and maintain it within a certain range.
[0032] S3, mix the water sample and the reagent in the dual-electrode reaction tank 29, and use the dual-electrode reaction tank 29 as a place for reaction and detection. At this time, the ammonia nitrogen in the water sample is converted into ammonia gas under pH adjustment, and the ammonia sensitive electrode 292 can measure the water sample potential value in real time , and then the concentration value of the water sample can be calculated When calculating, the water sample measured potential value Concentration value of water sample The relationship between them is as follows: In the formula, The potential value of the standard solution measured by the standard test is is the slope of the ammonia sensitive electrode 292.
[0033] This method uses the ammonia sensitive electrode 292 method for determination, which has high determination accuracy and good linearity. During the detection, the duration of continuous detection can be pre-set, and the water sample and reagent are continuously introduced within the set duration, so that the ammonia nitrogen content data of the water sample can be continuously obtained. In addition, the reagent used in the detection process is simple, only some alkali solution, the amount is small and no other harmful substances are introduced, which will not cause much impact on the water body being tested where the monitoring device is placed.
[0034] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which are within the scope of protection of the present invention.
Claims
1. A continuous monitoring device for ammonia nitrogen in water quality, characterized by: It includes a pretreatment module and an analysis and determination module, wherein the pretreatment module includes a filter, and the analysis and determination module includes a heating reaction kettle, a double-electrode reaction tank, a first peristaltic pump and a second peristaltic pump, wherein the double-electrode reaction tank is provided with a pH electrode and an ammonia sensitive electrode; A sample tube is connected to the liquid inlet of the filter, and the liquid outlet is connected to the liquid inlet of the heating reactor through the first peristaltic pump, and the liquid outlet of the heating reactor is connected to the liquid inlet of the dual-electrode reaction tank; a reagent tube is connected to the liquid inlet of the second peristaltic pump, and the liquid outlet is connected to the liquid inlet of the dual-electrode reaction tank.
2. A water quality ammonia nitrogen continuous monitoring device as claimed in claim 1, characterized in that: It also includes a waterproof shell, a control cloud box and a communication cable; the pretreatment module, the analysis and measurement module and the control cloud box are all fixedly arranged in the waterproof shell; the control cloud box controls the opening and closing of the pretreatment module and the analysis and measurement module; the communication cable is arranged outside the waterproof shell, and one end thereof passes through the waterproof shell to connect to the control cloud box.
3. A water quality ammonia nitrogen continuous monitoring device as claimed in claim 1, characterized in that: The pretreatment module also includes a filter valve, a flushing valve and a first diaphragm pump, and the filter valve and the flushing valve are both two-position three-way valves; the common end of the filter valve is connected to the liquid outlet of the filter, the normally open end is connected to the liquid inlet of the first peristaltic pump, and the normally closed end is connected to the liquid outlet of the first diaphragm pump; the common end of the flushing valve is connected to the liquid inlet of the first diaphragm pump, the normally open end is connected to the first air pipe, and the normally closed end is connected to the pure water pipe.
4. A water quality ammonia nitrogen continuous monitoring device as claimed in claim 1, characterized in that: A first sensor is arranged between the first peristaltic pump and the heating reactor, and a second sensor is arranged between the second peristaltic pump and the dual-electrode reaction tank. Both the first sensor and the second sensor are normally-open liquid level sensors.
5. A water quality ammonia nitrogen continuous monitoring device as claimed in claim 1, characterized in that: The analysis and determination module also includes an injection valve group, which includes a first solenoid valve, a second solenoid valve, a third solenoid valve, a first joint, a second joint, a third joint, a first standard liquid tube, a second standard liquid tube, a cleaning tube and an analysis tube; the first solenoid valve, the second solenoid valve and the third solenoid valve are all two-way solenoid valves, and the first joint, the second joint and the third joint are all three-way joints; The first standard liquid tube and the second standard liquid tube are respectively connected to the two ends of the first joint through the first solenoid valve; the other end of the first joint and the cleaning tube are respectively connected to the two ends of the second joint through the second solenoid valve; the other end of the second joint and the analysis tube are respectively connected to the two ends of the third joint through the third solenoid valve; the other end of the third joint is connected to the liquid inlet of the first peristaltic pump.
6. A water quality ammonia nitrogen continuous monitoring device as claimed in claim 1, characterized in that: The analysis and measurement module also includes a pipetting unit and a fourth joint, the pipetting unit includes a second diaphragm pump, a second air tube and a ball valve; the fourth joint is a three-way joint, one end of the fourth joint is connected to the liquid inlet of the heating reactor, one end is connected to the liquid outlet of the first peristaltic pump, and one end is connected to one end of the second diaphragm pump through the ball valve, and the second air tube is connected to the second diaphragm pump.
7. A water quality ammonia nitrogen continuous monitoring device as claimed in claim 5, characterized in that: It also includes a first liquid storage device and a second liquid storage device; the first liquid storage device is provided with multiple, and the reagent tube, the first standard liquid tube, the second standard liquid tube and the cleaning tube are respectively connected to the liquid outlets of different first liquid storage devices; the dual-electrode reaction tank is connected to an overflow pipe on the side, and a drain pipe on the bottom, and is respectively connected to the liquid inlet of the second liquid storage device through the overflow pipe and the drain pipe; a third sensor is provided at the liquid inlet of the second liquid storage device, and a drain valve is provided on the drain pipe, the third sensor is a normally open liquid level sensor, and the drain valve is a one-way solenoid valve.
8. A method for determining ammonia nitrogen in water quality, characterized in that: The method of using the water quality ammonia nitrogen continuous monitoring device as described in any one of claims 1 to 7 for determination comprises the following steps: S1, extracting a water sample through the first peristaltic pump, filtering the water sample through the filter and pumping the water sample into the heating reactor for heating, and after the heating is completed, pumping the water sample into the dual-electrode reaction tank; S2, extracting the reagent of the alkaline expelling liquid by the second peristaltic pump, and injecting the reagent into the dual-electrode reaction tank; S3, obtaining the water sample measurement potential value by measuring with the ammonia sensitive electrode , and calculate the concentration value of the water sample .
9. A method for determining ammonia nitrogen in water quality as claimed in claim 8, characterized in that: In step S3, the water sample measures the potential value The water sample concentration value The relationship is as follows: In the formula, Measure the potential value for the standard solution, is the slope of the ammonia gas sensitive electrode.