In-situ water quality analyzer and water quality analysis method

Abstract

The invention discloses an in-situ water quality analyzer and a water quality analysis method.The in-situ water quality analyzer comprises a flow path switching control assembly, a feedback assembly, a medium conveying power assembly, an outflow assembly, a detection assembly, a backflow assembly, a pollution discharge assembly and a controller, and the pollution discharge assembly is used for being communicated with the backflow assembly to discharge or collect media; the controller is electrically connected with the flow path switching control assembly, the feedback assembly, the medium conveying power assembly, the outflow assembly, the detection assembly, the backflow assembly and the pollution discharge assembly and used for controlling the flow path switching control assembly, the medium conveying power assembly, the outflow assembly, the detection assembly and the backflow assembly to communicate end to end so as to form a closed circulation flow path. Compared with the prior art, the sampling accuracy is improved, the influence of interference factors such as inclination and shaking can be counteracted, the signal error during detection is eliminated, the internal flow path is simple, the detection, cleaning and maintenance requirements can be met, the reliability of the detection result is high, and the device is suitable for the marine environment, high in practicability and suitable for wide popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and in particular, to an in-situ water quality analyzer. In addition, the present invention also relates to a water quality analysis method using the in-situ water quality analyzer. Background Art

[0002] With the influence of human activities and climate change, the concentration of nutrients in seawater has changed, which has a profound impact on marine biodiversity. Monitoring of nutrients in seawater is of great significance for understanding the health of marine ecosystems, predicting red tides and maintaining fishery resources. Monitoring of nutrients in seawater usually involves regular testing of parameters such as ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and phosphate to ensure the sustainable development of the marine environment.

[0003] The in-situ seawater nutrient analyzer is a key equipment for seawater nutrient monitoring. It adopts wet chemical reaction and spectrophotometric detection as the detection principle, and is mainly composed of components such as a metering unit, a reaction unit and a detection unit. Among them, the metering unit is responsible for accurately delivering the water samples and reagents required for the quantitative chemical reaction. The reaction unit is the place where the water samples and reagents undergo chemical reactions. The detection unit is mainly composed of a light source detection device, which is used to detect the sample color signal value, thereby calculating the nutrient content in the water sample.

[0004] However, the existing in-situ seawater nutrient analyzers have the following shortcomings:

[0005] 1. Due to the interference factors such as tilt and shaking in the marine application environment, the existing in-situ seawater nutrient analyzer cannot use the infrared sensing recognition technology on both sides of the liquid level tube to determine the accuracy of the sampling volume. It can only rely on the number of steps or time of the motor rotation of the high-precision peristaltic pump or syringe pump to measure the extraction volume of water samples and reagents. As a result, the in-situ seawater nutrient analyzer lacks accurate and reliable sampling volume measurement and judgment measures when extracting water samples and reagents, and cannot ensure whether the water samples and reagents are accurately extracted and measured, which greatly affects the repeatability and stability of the data. When bubbles appear in the water sample or reagent pipeline or the corresponding liquid is missing, the actual sampling accuracy of the water sample or reagent in the pipeline cannot be guaranteed by relying solely on the measurement of the pump motor steps. The repeatability and stability of the data are poor, making the test results unreliable.

[0006] 2. During operation at sea, when the liquid in the detection unit is collecting and detecting absorbance signals, the liquid in the detection unit is easily affected by interference factors such as shaking and tilting, resulting in part of the liquid in the detection unit being lower than the light path emitted by the light source, thereby interfering with the signal detection of the Lamport ratio law, resulting in very large signal errors and making the detection results unreliable.

[0007] 3. When the in-situ seawater nutrient analyzer uses a plunger pump combined with a multi-channel switching valve for the analysis and detection flow path, there are problems such as incomplete wet chemical reaction, time-consuming and water-consuming detection and cleaning processes; when the in-situ seawater nutrient analyzer uses a micro-flow path component or a three-way valve group combined with a power pump to form an analysis and detection flow path, the flow path structure is very complex. Failure of any valve group will cause the entire flow path system to be paralyzed, and the equipment has high maintenance requirements; in summary, the internal flow path cannot meet the detection, cleaning and maintenance requirements. Summary of the invention

[0008] The present invention provides an in-situ water quality analyzer and a water quality analysis method to solve the technical problems that the existing in-situ seawater nutrient salt analyzer cannot accurately sample, has large signal errors, and the internal flow path cannot meet the requirements of detection, cleaning and maintenance.

[0009] According to one aspect of the present invention, there is provided an in-situ water quality analyzer, comprising a flow path switching control component, a feedback component, a medium conveying power component, an outflow component, a detection component, a reflux component, a sewage discharge component and a controller, wherein the flow path switching control component is used to be connected to containers storing a plurality of detection media, respectively, so as to control the sequential delivery of the media required in the detection process to the outflow component 400, the medium conveying power component is used to provide conveying power for the detection medium, the sewage discharge component is used to be connected to the reflux component to discharge or collect the medium, and the controller is electrically connected to the flow path switching control component, the feedback component, the medium conveying power component, the outflow component, the detection component, the reflux component and the sewage discharge component, respectively, and is used to control the flow path switching control component, the medium conveying power component, the outflow component, the detection component and the reflux component The ends are connected to form a closed circulation flow path; the feedback component is used to collect corresponding electrical signals according to the state of liquid in the output end of the flow path switching control component when the medium conveying power component starts to work, and record the electrical signal collection time and the working time of the medium conveying power component, so as to feed back the electrical signal, collection time and working time to the controller, and the controller is used to determine whether to issue a warning signal according to the electrical signal, collection time and working time, and / or control the medium conveying power component to stop working; the detection component includes a reaction pool with a bottom surface inclined at a preset angle, an optical detection module arranged on the bottom side of the reaction pool for forming a light detection channel at the bottom of the reaction pool, an input port opened on the reaction pool at a preset height and connected to the outflow component, and an air-to-air component connected to the reaction pool for communicating with the outside world.

[0010] As a further improvement of the above technical solution:

[0011] Furthermore, the feedback component includes a liquid sensor and a time recording unit. The liquid sensor is used to collect electrical signal one when there is no liquid in the output end of the flow path switching control component, or to collect electrical signal two when there is liquid in the output end of the flow path switching control component. The time recording unit is used to record the time when the liquid sensor collects electrical signal two, the time when the medium transport power component starts working, and the time when the medium transport power component extracts a preset volume of liquid.

[0012] Furthermore, the optical detection module includes a mounting base arranged outside the reaction pool, a composite light source arranged outside the first bottom side of the reaction pool for independently emitting multi-band light sources, and an optical signal detector arranged outside the second bottom side of the reaction pool and opposite to the composite light source for detecting the optical signal emitted by the light source.

[0013] Furthermore, the flow path switching control component is a multi-valve group, which includes a straight pipeline connected to the reflux component and the detection component respectively, and a multi-way valve port arranged on the straight pipeline for respectively controlling whether multiple detection media and air can flow into the straight pipeline.

[0014] Furthermore, the in-situ water quality analyzer also includes a control valve five arranged on the outflow component, a cadmium column connected to the control valve five, a reflux pipe respectively connected to the output end of the cadmium column and the input end of the reaction tank, a control valve six arranged on the reflux pipe, and a waste liquid collection pipe one connected to the control valve six. The control valve five is used to connect the outflow component to the flow path switching control component and the reaction tank, or to connect the outflow component to the flow path switching control component and the cadmium column. The control valve six is ​​used to connect the cadmium column and the reaction tank, or to connect the cadmium column and the waste liquid collection pipe one.

[0015] Furthermore, the air-control component includes an air-control pipe connected to the reaction tank and a control valve arranged on the air-control pipe.

[0016] Furthermore, the sewage discharge component also includes a control valve three arranged on the reflux component and a sewage main pipe connected to the control valve three, a control valve four arranged on the sewage main pipe, a waste liquid collection pipe two connected to the control valve four, and a waste liquid straight discharge pipe connected to the control valve four.

[0017] According to another aspect of the present invention, a water quality analysis method is also provided, which adopts the above-mentioned in-situ water quality analyzer and includes the following steps: S1, a controller controls the medium conveying power component to operate, controls the extraction of water samples into a reaction tank through a flow path switching control component, and then controls the extraction of reagents required for detection into a closed circulation loop through the flow path switching control component, and then pushes the reagents in the closed circulation loop into the reaction tank by extracting air; S2, a controller controls the medium conveying power component to operate, so that the unmixed water samples and reagents in the reaction tank are fully circulated, mixed and reacted in the closed circulation flow path; S3, a controller controls the medium conveying power component to operate, pushes the mixed liquid in the closed circulation flow path into the reaction tank by extracting air, and then the optical detection module turns on the corresponding monochromatic light source according to the parameters to be detected, so as to form a light detection channel in the reaction tank to detect the mixed liquid in the reaction tank; S4, a controller controls the medium conveying power component to operate, so that the waste liquid in the reaction tank is discharged to the sewage discharge component.

[0018] As a further improvement of the above technical solution:

[0019] Furthermore, step S4 is followed by the following steps: S5, in which the controller controls the operation of the medium transport power component, controls the extraction of the cleaning liquid into the closed circulation loop through the flow path switching control component, and then controls the extraction of air into the closed circulation loop through the flow path switching control component, so as to discharge the cleaning liquid into the sewage discharge component through the air; S6, repeating steps S1-S5 until the detection of multiple parameters is completed.

[0020] Furthermore, when detecting phosphate, sodium molybdate reagent is used, and when detecting nitrate nitrogen, vanadium chloride reagent is used.

[0021] The present invention has the following beneficial effects:

[0022] The in-situ water quality analyzer of the present invention is connected to containers storing multiple detection media respectively through a flow path switching control component to control the sequential delivery of the media required in the detection process to the outflow component, and the medium delivery power component provides delivery power for the detection medium. The flow path switching control component, the medium delivery power component, the outflow component, the detection component and the reflux component are connected end to end through a controller to form a closed circulation flow path, so that when performing water quality detection and analysis, multiple detection media are drawn into the closed circulation flow path through the medium delivery power component for circulation and full mixing, so as to improve the repeatability stability of the wet chemical reaction and the subsequent detection results. Reliability, then the medium transport power component extracts air to push the mixed liquid into the reaction tank through the air, and exhausts the air to the outside through the air-to-air component. The optical detection module forms a light detection channel at the bottom of the reaction tank for detection. After the detection is completed, the medium transport power component extracts the cleaning liquid and circulates it in the closed circulation flow path for full cleaning, and then discharges it through the sewage discharge component to achieve no reagent residue and cleaning dead corners, eliminate the interference of reagent residues in the reaction system pipeline and the memory effect between samples, so as to improve the stability of the reaction system and the authenticity and reliability of the analysis results; when used in marine environments and disturbed by factors such as shaking and tilting, the feedback component When the medium conveying power component starts to work, the corresponding electrical signal is collected according to the liquid existence state in the output end of the flow path switching control component, and the electrical signal collection time and the working time of the liquid medium conveying power medium conveying power component are recorded, so as to feed back the electrical signal, the collection time and the working time to the controller. The controller determines whether to issue a warning signal according to the electrical signal, the collection time and the working time, and / or controls the medium conveying power component to stop working, thereby improving the accuracy of actual sampling and ensuring the repeatability and stability of the detection data. The input port on the pool can push all the mixed liquid in the closed circulation flow path into the reaction pool for photometric detection, and ensure that the liquid surface of the mixed liquid covers the light detection channel. When the liquid surface in the reaction pool shakes, it will not affect the light source signal detection. At the same time, the reaction pool with the bottom surface tilted at a preset angle can ensure the normal progress of detection and cleaning work. Compared with the existing technology, this solution improves the sampling accuracy, offsets the influence of interference factors such as tilting and shaking, eliminates signal errors during detection, the internal flow path is simple and clear, can meet the requirements of detection, cleaning and maintenance, the detection results are highly reliable, suitable for marine environment, strong practicality, and suitable for wide promotion and application.

[0023] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 is a structural schematic diagram of an in-situ water quality analyzer according to a preferred embodiment of the present invention;

[0026] Figure 2 It is a partial structural schematic diagram of the detection component in the in-situ water quality analyzer of the preferred embodiment of the present invention.

[0027] Legend:

[0028] 100, flow path switching control component; 200, feedback component; 300, medium conveying power component; 400, outflow component; 500, detection component; 510, reaction pool; 520, optical detection module; 521, mounting seat; 522, composite light source; 523, optical signal detector; 530, input port; 540, control valve one; 600, reflux component; 610, control valve two; 700, sewage discharge component; 710, control valve three; 720, control valve four; 730, waste liquid collection pipe two; 740, waste liquid straight discharge pipe; 810, control valve five; 820, cadmium column; 830, control valve six; 840, waste liquid collection pipe one. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0030] like Figure 1 and Figure 2As shown, the in-situ water quality analyzer of this embodiment includes a flow path switching control component 100, a feedback component 200, a medium conveying power component 300, an outflow component 400, a detection component 500, a backflow component 600, a sewage discharge component 700 and a controller. The flow path switching control component 100 is used to be connected to containers storing a variety of detection media respectively to control the sequence of the media required in the detection process to be delivered to the outflow component 400, the medium conveying power component 300 is used to provide conveying power for the detection medium, and the sewage discharge component 700 is used to connect to the backflow component 600 to discharge or collect the medium. The controller is electrically connected to the flow path switching control component 100, the feedback component 200, the medium conveying power component 300, the outflow component 400, the detection component 500, the backflow component 600 and the sewage discharge component 700, and is used to control the flow path switching control component 100, the medium conveying power component 300, the outflow component 400, the detection component 500, the backflow component 600 and the sewage discharge component 700. 00 and the reflux component 600 are connected end to end to form a closed circulation flow path; the feedback component 200 is used to collect the corresponding electrical signal according to the liquid existence state in the output end of the flow path switching control component 100 when the medium conveying power component 300 starts to work, and record the electrical signal collection time and the working time of the medium conveying power component 300, so as to feed back the electrical signal, the collection time and the working time to the controller, and the controller is used to determine whether to issue a warning signal according to the electrical signal, the collection time and the working time, and / or control the medium conveying power component 300 to stop working; the detection component 500 includes a reaction pool 510 with a preset bottom surface inclined at a preset angle, an optical detection module 520 arranged on the bottom side of the reaction pool 510 for forming a light detection channel at the bottom of the reaction pool 510, an input port 530 opened on the reaction pool 510 at a preset height and connected to the outflow component 400, and an air-to-air component connected to the reaction pool 510 for connecting to the outside.

[0031] like Figure 1 and Figure 2As shown, specifically, the in-situ water quality analyzer of the present invention is connected to containers storing multiple detection media respectively through the flow path switching control component 100 to control the order of the media required in the detection process to be delivered to the outflow component 400, and the medium delivery power component 300 provides delivery power for the detection medium. The flow path switching control component 100, the medium delivery power component 300, the outflow component 400, the detection component 500 and the reflux component 600 are connected end to end through the controller to form a closed circulation flow path, so that when performing water quality detection and analysis, the medium delivery power component 300 is used to extract multiple detection media into the closed circulation flow path for circulation and full mixing, so as to improve the weight of the wet chemical reaction. The medium transport power component 300 then extracts air to push the mixed solution into the reaction tank 510 through the air, and exhausts the air to the outside through the air-to-air component. The optical detection module 520 forms a light detection channel at the bottom of the reaction tank 510 for detection. After the detection is completed, the medium transport power component 300 extracts the cleaning liquid and circulates it in the closed circulation flow path for full cleaning, and then discharges it through the sewage discharge component 700 to achieve no reagent residue and cleaning dead corners, eliminate the interference of reagent residues in the reaction system pipeline and memory effects between samples, so as to improve the stability of the reaction system and the authenticity and reliability of the analysis results; when used in marine environments, it is affected by factors such as shaking and tilting. When interference occurs, the feedback component 200 collects corresponding electrical signals according to the liquid presence status in the output end of the flow path switching control component 100 when the medium conveying power component 300 starts to work, and records the electrical signal collection time and the working time of the liquid medium conveying power medium conveying power component 300, so as to feed back the electrical signal, collection time and working time to the controller. The controller determines whether to issue a warning signal according to the electrical signal, collection time and working time, and / or controls the medium conveying power component 300 to stop working, thereby improving the accuracy of actual sampling, ensuring the repeatability and stability of the detection data, and through the optical detection module 520 arranged on the bottom side of the reaction pool 510 and maintaining the preset The input port 530 which is highly opened on the reaction tank 510 can push all the mixed liquid in the closed circulation flow path into the reaction tank 510 for photometric detection, and ensure that the liquid surface of the mixed liquid covers the light detection channel. When the liquid surface in the reaction tank 510 shakes, it will not affect the light source signal detection. At the same time, by tilting the bottom surface of the reaction tank 510 at a preset angle, the normal detection and cleaning work is guaranteed. Compared with the prior art, this solution improves the sampling accuracy, can offset the influence of interference factors such as tilting and shaking, eliminates signal errors during detection, the internal flow path is simple and clear, can meet the requirements of detection, cleaning and maintenance, the detection results are highly reliable, suitable for marine environment, strong practicality, and suitable for wide promotion and application.

[0032] It should be understood that the in-situ water quality analyzer of this embodiment can be used for in-situ monitoring of silicate, hexavalent chromium, manganese, iron, copper and other ions in addition to monitoring of seawater nutrients.

[0033] It should be understood that when the detection medium is a reagent, its usage is relatively small, and in order to ensure detection efficiency, the cross-sectional area of ​​the closed circulation pipeline is relatively large. Therefore, the reagent needs to be pushed to the detection pool with the assistance of air to ensure flow efficiency.

[0034] Optionally, the controller is a PLC controller.

[0035] It should be understood that the various detection media include cleaning fluids, water samples, reagents, standard solutions, and air.

[0036] Optionally, 20°≤preset angle≤45°. Optionally, the preset angle is 30°, which can meet the normal detection and cleaning work of the in-situ water quality analyzer under the condition that the reaction tank 510 is shaken and the tilt angle does not exceed 45°.

[0037] It should be understood that when the liquid in the reaction pool 510 is tilted at least 45°, the height of the immersion position of the liquid in the reaction pool 510 is still less than or equal to the preset height to ensure that the liquid in the reaction pool completely covers the optical detection channel.

[0038] Optionally, the medium delivery power component 300 is a peristaltic pump, and is connected to the flow path switching control component 100 and the outflow component 400 respectively.

[0039] like Figure 1 As shown, optionally, the reflux component 600 includes a reflux pipeline and a control valve 2 610 arranged on the reflux pipeline for controlling the opening and closing of the reflux pipeline.

[0040] In this embodiment, the feedback component 200 includes a liquid sensor and a time recording unit. The liquid sensor is used to collect electrical signal one when there is no liquid in the output end of the flow path switching control component 100, or to collect electrical signal two when there is liquid in the output end of the flow path switching control component 100. The time recording unit is used to record the time when the liquid sensor collects electrical signal two, the time when the medium transport power component 300 starts to work, and the time when the medium transport power component 300 extracts a preset volume of liquid.

[0041] Specifically, the liquid sensor and the time recording unit cooperate to determine the liquid extraction state: set the electrical signal 1 to V0, the electrical signal 2 to V1, when there is no liquid in the output end of the flow path switching control component 100, the liquid sensor collects V0, and when the output end of the flow path switching control component 100 is filled with liquid, the liquid sensor collects V1; in the initial state, the time recording unit records the time when the medium conveying power component 300 starts working as T0, and the liquid sensor collects V0. When the liquid is pumped to the liquid sensor position, the liquid sensor collects V1 and records the collection time as T1. According to the liquid flow rate and pipeline length in the closed circulation flow path, the controller presets a time period threshold ΔT1=T1-T0. When the medium conveying power component 300 is turned on for more than the threshold ΔT1, and the liquid sensor still has not collected V1, then It is determined that the liquid extraction has failed, and the controller issues a fault alarm prompt; the liquid sensor and the time recording unit cooperate to determine the consistency of the liquid extraction amount: when other conditions are kept consistent, the medium conveying power component 300 has a fixed working time each time it extracts a preset number of steps of volume liquid; when the liquid is pumped to the liquid sensor position, the liquid sensor collects V1 and records the collection time as T1, the medium conveying power component 300 continues to work, and the electrical signal used by the liquid sensor continues to be V1 until the medium conveying power component 300 works to the preset number of extraction steps and stops, at which time the recorded time is T2, and ΔT2=T2-T1 is calculated, and the ΔT2 value is recorded. If the ΔT2 value is basically consistent with the controller preset ΔT2, it indicates that the consistency of the liquid extraction amount is good, and the controller does not alarm, otherwise an alarm prompts. In addition, if the electrical signal collected by the liquid sensor is not a continuous V1 signal but a V0 signal is interspersed during the continuous operation of the medium conveying power component 300, the controller also issues an alarm prompt, and when the total time of the interspersed V0 signal is greater than the preset time threshold, the controller controls the medium conveying power component 300 to stop working and terminate the test.

[0042] It should be understood that when the medium conveying power component 300 is a peristaltic pump, each time the peristaltic pump extracts a volume of liquid of a preset number of steps, the motor of the peristaltic pump rotates a corresponding fixed number of steps, so that when the liquid is pumped to the liquid sensor position, the liquid sensor collects V1 and records the collection time as T1. The peristaltic pump continues to work, and the electrical signal used by the liquid sensor continues to be V1 until the motor of the peristaltic pump rotates a corresponding fixed number of steps. At this time, the recorded time is T2, and ΔT2=T2-T1 is calculated, and the ΔT2 value is recorded. If the ΔT2 value is basically consistent with the controller preset ΔT2, it indicates that the consistency of the liquid extraction amount is good, and the controller does not alarm, otherwise an alarm prompts.

[0043] like Figure 2As shown, in this embodiment, the optical detection module 520 includes a mounting base 521 arranged outside the reaction pool 510, a composite light source 522 arranged outside the first bottom side of the reaction pool 510 for independently emitting multi-band light sources, and an optical signal detector 523 arranged outside the second bottom side of the reaction pool 510 and opposite to the composite light source 522 for detecting the optical signal emitted by the light source.

[0044] like Figure 2 As shown, specifically, the composite light source 522 and the optical signal detector 523 can be installed by the mounting seat 521 arranged outside the reaction tank 510, and the composite light source 522 and the optical signal detector 523 are arranged relatively outside the first bottom side of the reaction tank 510 and outside the second bottom side of the reaction tank 510, respectively, so as to form a light detection channel at the bottom of the reaction tank 510, ensuring that the liquid to be detected can completely cover the light detection channel. Optionally, the composite light source 522 can separately turn on the single-band light sources of 700nm, 880nm, and 540nm, so as to use 700nm when detecting ammonia nitrogen, 880nm when detecting phosphate, and 540nm when detecting nitrite nitrogen and nitrate nitrogen, so that the four seawater nutrient parameters can be detected in sequence.

[0045] Optionally, the bottom surface of the reaction tank 510 is arranged in a conical shape, and is provided with a bottom branch port which is located at the bottom of the bottom surface when tilted or shaken and is connected to the reflux component 600, so as to ensure that the liquid in the reaction tank 510 can flow out smoothly from the bottom branch port, thereby ensuring that closed-loop mixing and closed-loop cleaning can be carried out normally.

[0046] It should be understood that, in one embodiment, the reaction pool 510 has multiple bottom surfaces, and the bottom surface of the reaction pool 510 is arranged in a conical shape, and can be one surface, two surfaces, or multiple surfaces.

[0047] Optionally, the bottom branch port is centrally arranged on the bottom surface of the reaction tank 510 to ensure that the bottom branch port is at the lowest end of the bottom surface when tilted or shaken.

[0048] In this embodiment, the reaction pool 510 is arranged in a rectangular shape, the bottom surface of the reaction pool 510 is arranged in a conical shape, and the bottom branch is opened in the center so that the bottom surface is inclined at a preset angle to ensure that the liquid in the reaction pool 510 can flow out smoothly from the bottom branch and is suitable for small volume detection.

[0049] In this embodiment, the reaction pool 510 has two bottom surfaces, and both bottom surfaces are conical surfaces, and the bottom outlet is arranged between the two bottom surfaces.

[0050] Optionally, in another embodiment, the reaction pool 510 is arranged in a cylindrical shape, the bottom surface of the reaction pool 510 is arranged in a conical shape, and the bottom branch is opened in the center so that the bottom surface is inclined at a preset angle to ensure that the liquid in the reaction pool 510 can flow out smoothly from the bottom branch.

[0051] Optionally, in another embodiment, the reaction pool 510 is arranged in a cylindrical shape, the bottom surface of the reaction pool 510 is flat, the reaction pool 510 is tilted so that the bottom surface of the reaction pool is tilted at a preset angle, and the bottom branch is located at the lowest end of the bottom surface to ensure that the liquid in the reaction pool 510 can flow out smoothly from the bottom branch.

[0052] It should be understood that by tilting the bottom surface of the reaction tank 510 at a preset angle, the medium in the reaction tank 510 can still flow out from the bottom branch under the interference of factors such as shaking and tilting, thereby ensuring normal closed-loop mixing and closed-loop cleaning.

[0053] like Figure 1 As shown, in this embodiment, the flow path switching control component 100 is a multi-valve group, which includes a straight pipeline connected to the reflux component 600 and the detection component 500 respectively, and a multi-way valve port arranged on the straight pipeline for controlling whether a plurality of detection media and air can flow into the straight pipeline respectively. Specifically, during the detection process, according to the detection needs, the valve port corresponding to the required detection medium is opened, so that under the action of the medium conveying power component 300, the detection medium is pumped into the straight pipeline to flow in the closed circulation flow path, and under the action of the multi-way valve port and the straight pipeline, the detection media do not interfere with each other and are shared.

[0054] like Figure 1 As shown, optionally, in this embodiment, the multi-way valve port includes 7 reagent valve ports, 4 standard liquid valve ports, 1 water sample valve port, 1 cleaning liquid valve port and 1 air valve port, so as to meet the detection requirements of four seawater nutrient parameters.

[0055] like Figure 1As shown, in this embodiment, the in-situ water quality analyzer also includes a control valve five 810 arranged on the outflow component 400, a cadmium column 820 connected to the control valve five 810, a reflux pipe connected to the output end of the cadmium column 820 and the input end of the reaction tank 510 respectively, a control valve six 830 arranged on the reflux pipe, and a waste liquid collection pipe one 840 connected to the control valve six 830. The control valve five 810 is used to connect the outflow component 400 to the flow path switching control component 100 and the reaction tank 510, or to connect the outflow component 400 to the flow path switching control component 100 and the cadmium column 820, and the control valve six 830 is used to connect the cadmium column 820 and the reaction tank 510, or to connect the cadmium column 820 and the waste liquid collection pipe one 840. Specifically, the outflow component 400 is connected to the flow path switching control component 100 and the cadmium column 820 through the control valve 5 810, and the control valve 6 830 is connected to the cadmium column 820 and the reaction tank 510 to form a closed circulation flow path of the flow path switching control component 100, the medium conveying power component 300, the outflow component 400, the cadmium column 820, the reaction tank 510 and the reflux component 600, so as to perform seawater nitrate cadmium column reduction analysis and detection through the flow path. Compared with the vanadium chloride reagent reduction detection, it has the advantages of high reduction efficiency, no seawater base difference interference and benchmarking marine standard detection methods. After the detection is completed, the control valve 6 830 is connected to the cadmium column 820 and the waste liquid collection pipe 1 840 to discharge the waste liquid and collect it for unified treatment. Optionally, the control valve 5 810 and / or the control valve 6 830 are three-way solenoid valves.

[0056] like Figure 1 As shown, optionally, in this embodiment, when the control valve five 810 is in the de-energized state, the outflow component 400 is connected to the flow path switching control component 100 and the reaction tank 510, and when the control valve five 810 is in the energized state, the outflow component 400 is connected to the flow path switching control component 100 and the cadmium column 820; in another embodiment, when the control valve five 810 is in the de-energized state, the outflow component 400 is connected to the flow path switching control component 100 and the cadmium column 820, and when the control valve five 810 is in the energized state, the outflow component 400 is connected to the flow path switching control component 100 and the reaction tank 510.

[0057] like Figure 1 As shown, optionally, in this embodiment, when the control valve six 830 is in the de-energized state, the cadmium column 820 and the reaction tank 510 are connected, and when the control valve six 830 is in the energized state, the cadmium column 820 and the waste liquid collection pipe 840 are connected; in another embodiment, when the control valve six 830 is in the de-energized state, the cadmium column 820 and the waste liquid collection pipe 840 are connected, and when the control valve six 830 is in the energized state, the cadmium column 820 and the reaction tank 510 are connected.

[0058] like Figure 1As shown, in this embodiment, the air-control part includes an air-control pipe connected to the reaction pool 510 and a control valve 1 540 arranged on the air-control pipe. Specifically, the air-control pipe is connected to the outside world, and the air-control pipe is controlled to open and close by the control valve 1 540, so that when the air transports the reagent, the control valve 1 540 opens the air-control pipe to quickly discharge the air after entering the reaction pool 510, and in other cases, the control valve 1 540 closes the air-control pipe. Optionally, the control valve 1 540 is a solenoid valve.

[0059] like Figure 1 As shown, in this embodiment, the sewage discharge component 700 also includes a control valve three 710 arranged on the reflux component 600 and a sewage main pipe connected to the control valve three 710, a control valve four 720 arranged on the sewage main pipe, a waste liquid collection pipe two 730 connected to the control valve four 720, and a waste liquid straight discharge pipe 740 connected to the control valve four 720. Specifically, after the detection is completed, the control valve three 710 connects the reflux component 600 to the reaction pool 510 and the sewage main pipe, and the control valve four 720 connects the sewage main pipe and the waste liquid collection pipe two 730, so as to collect the waste liquid and treat it in a centralized manner; then, the control valve three 710 connects the reflux component 600 to the reaction pool 510 and the flow path switching control component 100, and the medium conveying power component 300 pumps the cleaning liquid to circulate in the closed circulation flow path, so as to push the cleaning liquid into the reaction pool 510 after the cleaning is completed, and then the control valve three 710 connects the reflux component 600 and the sewage main pipe, and the control valve four 720 connects the sewage main pipe and the waste liquid straight discharge pipe 740 to discharge the cleaning liquid. Optionally, the control valve three 710 and / or the control valve four 720 are three-way solenoid valves.

[0060] like Figure 1 As shown, optionally, in this embodiment, when the control valve three 710 is in the de-energized state, the reflux component 600 is connected to the reaction tank 510 and the flow path switching control component 100, and when the control valve three 710 is in the energized state, the reflux component 600 is connected to the reaction tank 510 and the sewage main pipe; in another embodiment, when the control valve three 710 is in the de-energized state, the reflux component 600 is connected to the reaction tank 510 and the sewage main pipe, and when the control valve three 710 is in the energized state, the reflux component 600 is connected to the reaction tank 510 and the sewage main pipe.

[0061] like Figure 1 As shown, optionally, in this embodiment, when the control valve four 720 is in the de-energized state, the main sewage pipe and the waste liquid straight discharge pipe 740 are connected, and when the control valve four 720 is in the energized state, the main sewage pipe and the waste liquid collection pipe 2 730 are connected; in another embodiment, when the control valve four 720 is in the de-energized state, the main sewage pipe and the waste liquid collection pipe 2 730 are connected, and when the control valve four 720 is in the energized state, the main sewage pipe and the waste liquid straight discharge pipe 740 are connected.

[0062] The water quality analysis method of this embodiment adopts the above-mentioned in-situ water quality analyzer, and includes the following steps: S1, the controller controls the medium delivery power component 300 to work, controls the water sample to be extracted into the reaction tank 510 through the flow path switching control component 100, and then controls the reagent required for detection to be extracted into the closed circulation loop through the flow path switching control component 100, and then pushes the reagent in the closed circulation loop into the reaction tank 510 by extracting air; S2, the controller controls the medium delivery power component 300 to work, so that the unmixed water in the reaction tank 510 The uniform water sample and reagent are fully circulated, mixed and reacted in the closed circulation flow circuit; S3, the controller controls the medium conveying power component 300 to work, and pushes the mixed liquid in the closed circulation flow circuit into the reaction tank 510 by extracting air, and then the optical detection module 520 turns on the corresponding monochromatic light source according to the parameters to be detected, so as to form a light detection channel in the reaction tank 510 to detect the mixed liquid in the reaction tank 510; S4, the controller controls the medium conveying power component 300 to work, so that the waste liquid in the reaction tank 510 is discharged to the sewage discharge component 700.

[0063] Specifically, by adopting the above steps in conjunction with an in-situ water quality analyzer to overcome interference factors such as shaking and tilting in a marine environment, analysis and detection of seawater nutrients can be achieved, thereby improving the reliability of the test results, being highly practical, and being suitable for wide promotion and application.

[0064] It should be understood that the water quality analysis method of this embodiment can be used for in-situ monitoring of silicate, hexavalent chromium, manganese, iron, copper and other ions in addition to monitoring of seawater nutrients.

[0065] In this embodiment, after step S4, the following steps are also included: S5, the controller controls the medium conveying power component 300 to work, controls the cleaning liquid to be drawn into the closed circulation loop through the flow path switching control component (100) to circulate, and then controls the air to be drawn into the closed circulation loop through the flow path switching control component 100, so as to discharge the cleaning liquid into the sewage discharge component 700 through the air; S6, repeating steps S1-S5 until the detection of multiple parameters is completed. Specifically, by cleaning after the parameter detection, the residual detection reagent is avoided during the subsequent parameter detection, the interference of the reagent residue in the reaction system pipeline and the memory effect between samples is eliminated, the accuracy of the detection result is improved, and the detection of multiple parameters is completed by an in-situ water quality analyzer, which greatly reduces the detection cost and operation and maintenance cost.

[0066] Optionally, in one embodiment, an in-situ water quality analyzer is used to detect four seawater nutrient parameters to greatly reduce the monitoring cost of ocean water nutrients. The four seawater nutrients include ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and phosphate.

[0067] In this embodiment, sodium molybdate reagent is used when detecting phosphate, and vanadium chloride reagent is used when detecting nitrate nitrogen. Specifically, when detecting phosphate, sodium molybdate reagent is used to avoid the introduction of ammonia nitrogen substances to be detected into the reagent to interfere with the data accuracy of ammonia nitrogen parameters; when detecting nitrate nitrogen, vanadium chloride reagent is used to avoid the use of cadmium column 820 ammonium chloride buffer solution to introduce ammonia nitrogen substances to be detected to interfere with the data accuracy of ammonia nitrogen parameters, and avoid mutual interference between reagents during the detection process, thereby achieving sequential detection of four seawater nutrient parameters.

[0068] In this embodiment, with the combined effect of the multi-valve group, the composite light source 522 and the optimization adjustment of the reagent formula, it is achieved that four seawater nutrient parameters are detected in sequence in an in-situ water quality analyzer without mutual interference, and the detection results are reliable.

[0069] like Figure 1 As shown, in one embodiment, the specific steps of the water quality analysis method are as follows:

[0070] Sampling process:

[0071] The controller controls the peristaltic pump to rotate forward, and simultaneously opens the water sample valve port and the control valve 540 (the pump stops and the valve is closed, which will not be repeated later) to extract a quantitative water sample into the reaction tank 510, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the reagent valve port and the control valve 540 to extract a quantitative reagent into the closed circulation flow path, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the air valve port and the control valve 540, and uses the air drawn into the closed circulation flow path to push the reagent in the original closed circulation flow path into the reaction tank 510.

[0072] Mixing process:

[0073] The controller controls the peristaltic pump to rotate forward and opens the control valve 2 610 at the same time. The water sample and reagent in the reaction tank 510 are fully circulated, mixed and reacted in the closed circulation flow path, and then the peristaltic pump is turned off.

[0074] Optical inspection process:

[0075] The controller controls the peristaltic pump to rotate forward, and opens the air valve and the control valve 540 at the same time, and uses the air drawn into the closed circulation flow path to push the mixed liquid in half of the closed circulation flow path into the reaction tank 510, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate reversely, and opens the air valve and the control valve 540 at the same time, and uses the air drawn into the closed circulation flow path to push the water sample in the other half of the closed circulation flow path into the reaction tank 510, and then turns off the peristaltic pump; the optical detection module 520 turns on the corresponding monochromatic light source according to the nutrient salt parameter to be detected, so as to form a light detection channel in the reaction tank 510 to detect the mixed liquid in the reaction tank 510, and detects the absorbance value of the liquid in the reaction tank 510 according to Lambert's law, and achieves the purpose of detecting the nutrient salt parameter through the standard curve correction method.

[0076] Wastewater discharge process:

[0077] Open control valve four 720 in advance, the controller controls the peristaltic pump to rotate forward, and opens the air valve and control valve three 710 at the same time to use air to discharge the waste liquid in the reaction tank 510, and collect and process it uniformly through waste liquid collection pipe two 730. After discharge, close the peristaltic pump and control valve four 720.

[0078] Cleaning process:

[0079] The controller controls the peristaltic pump to rotate forward, and simultaneously opens the cleaning liquid valve port and control valve 1 540 to extract the cleaning liquid into the reaction tank 510, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens control valve 2 610, so that the water in the reaction tank 510 is fully circulated and cleaned in the closed circulation flow path, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the air valve port and control valve 1 540 to push the cleaning liquid in half of the closed circulation flow path into the reaction tank 510, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate reversely, and simultaneously opens control valve 1 540 and control valve 2 610 to push the cleaning liquid in the other half of the closed circulation flow path into the reaction tank 510, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the air valve port and control valve 3 710 to discharge the cleaning liquid in the reaction tank 510 through the waste liquid straight discharge pipe 740.

[0080] like Figure 1 As shown, in one embodiment, the specific steps of using the cadmium column 820 cyclic reduction method to analyze and detect seawater nitrate are as follows:

[0081] Sampling process:

[0082] The controller controls the peristaltic pump to rotate forward, and simultaneously opens the water sample valve port and the control valve 540 (the pump stops and the valve is closed, which will not be repeated later) to extract a quantitative water sample into the reaction tank 510, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the ammonium chloride buffer reagent valve port and the control valve 540 to extract a quantitative ammonium chloride buffer reagent into the closed circulation flow path, and then turns off the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the air valve port and the control valve 540, and uses the air drawn into the closed circulation flow path to push the reagent in the original closed circulation flow path into the reaction tank 510.

[0083] Mixing process:

[0084] The controller controls the peristaltic pump to rotate forward and opens the control valve 2 610 at the same time, so that the water sample and the ammonium chloride buffer reagent in the reaction tank 510 are fully circulated, mixed and reacted in the closed circulation flow path, and then the peristaltic pump is turned off; the controller controls the peristaltic pump to rotate forward and opens the air valve port and the control valve 1 540 at the same time, and uses the air drawn into the closed circulation flow path to push the mixed liquid in half of the closed circulation flow path into the reaction tank 510, and then the peristaltic pump is turned off; the controller controls the peristaltic pump to rotate reversely and opens the air valve port and the control valve 1 540 at the same time, and uses the air drawn into the closed circulation flow path to push the mixed liquid in the other half of the closed circulation flow path into the reaction tank 510, and then the peristaltic pump is turned off.

[0085] Cadmium column 820 reduction process:

[0086] Open control valve five 810, the controller controls the peristaltic pump to rotate forward, and opens control valve two 610 at the same time, so that the mixed liquid in the reaction tank 510 repeats the reduction reaction in the closed-loop flow path of detection tank → control valve three 710 → control valve two 610 → multi-valve group → peristaltic pump → control valve five 810 → cadmium column 820 → control valve six 830 → detection tank.

[0087] Color reaction process:

[0088] Close control valve five 810, the controller controls the peristaltic pump to rotate forward, and opens the air valve port and control valve one 540 at the same time, and uses the air drawn into the closed circulation flow path to push the water sample with cadmium column 820 reduced in half of the closed circulation flow path into the reaction tank 510, and then close the peristaltic pump; the controller controls the peristaltic pump to rotate reversely, and opens the air valve port and control valve one 540 at the same time, and uses the air to push the water sample with cadmium column 820 reduced in the other half of the closed circulation flow path into the reaction tank 510, and then close the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and opens the nitrate colorimetric reagent valve port and control valve one 540 at the same time to extract the nitrate colorimetric reagent into the closed circulation flow path, and then close the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and opens the air valve port and control valve one 540 at the same time, and uses the air drawn into the closed circulation flow path to push the reagent in the original closed circulation flow path into the reaction tank 510.

[0089] Optical inspection process:

[0090] The optical detection module 520 turns on the corresponding monochromatic light source according to the nutrient salt parameters to be detected, so as to form a light detection channel in the reaction pool 510 to detect the mixed liquid in the reaction pool 510, and detects the absorbance value of the liquid in the reaction pool 510 according to Lambert's law, and achieves the purpose of detecting the nutrient salt parameters through the standard curve correction method.

[0091] Wastewater discharge process:

[0092] Open control valve four 720 in advance, the controller controls the peristaltic pump to rotate forward, and opens the air valve and control valve three 710 at the same time to use air to discharge the waste liquid in the reaction tank 510, and collect and process it uniformly through waste liquid collection pipe two 730. After discharge, close the peristaltic pump and control valve four 720.

[0093] Cleaning process:

[0094] The controller controls the peristaltic pump to rotate forward, and simultaneously opens the cleaning liquid valve port and the control valve 1 540 to extract the cleaning liquid into the reaction tank 510, and then closes the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the ammonium chloride buffer reagent valve port and the control valve 2 610 to extract the ammonium chloride buffer reagent into the closed circulation flow path, and then closes the peristaltic pump; the controller controls the peristaltic pump to rotate forward, and simultaneously opens the air valve port and the control valve 1 540, and uses the air drawn into the closed circulation flow path to push the reagent in the original closed circulation flow path into the reaction tank 510 ... simultaneously opens the air valve port and the control valve 1 540, and uses the air drawn into the closed circulation flow path to push the reagent in the original closed circulation flow path into the reaction tank 510. Open control valve two 610, and the unmixed cleaning solution and ammonium chloride buffer reagent in the reaction tank 510 are fully circulated, mixed and reacted in the closed circulation flow circuit; open control valve five 810 and control valve six 830 in advance, the controller controls the peristaltic pump to rotate forward, and opens control valve one 540 and control valve two 610 at the same time, and the mixed cleaning solution and ammonium chloride buffer reagent in the reaction tank 510 are washed in the line of detection tank → control valve five 810 → control valve two 610 → multi-valve group → peristaltic pump → control valve five 810 → cadmium column 820 → control valve six 830 → waste liquid collection pipe one 840 to flush the cadmium column 820.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An in-situ water quality analyzer, characterized in that: The invention comprises a flow path switching control component (100), a feedback component (200), a medium conveying power component (300), an outflow component (400), a detection component (500), a backflow component (600), a sewage discharge component (700) and a controller. The flow path switching control component (100) is used to be connected to containers storing a plurality of detection media respectively, so as to control the sequential delivery of the media required in the detection process to the outflow component 400. The medium conveying power component (300) is used to provide conveying power for the detection medium. The sewage discharge component (700) is used to The controller is connected to the reflux component (600) to discharge or collect the medium, and is electrically connected to the flow path switching control component (100), the feedback component (200), the medium conveying power component (300), the outflow component (400), the detection component (500), the reflux component (600) and the sewage discharge component (700) respectively, and is used to control the flow path switching control component (100), the medium conveying power component (300), the outflow component (400), the detection component (500) and the reflux component (600) to be connected end to end to form a closed circulation flow path; The feedback component (200) is used to collect corresponding electrical signals according to the liquid presence state in the output end of the flow path switching control component (100) when the medium conveying power component (300) starts to work, and record the electrical signal collection time and the working time of the medium conveying power component (300), so as to feed back the electrical signal, the collection time and the working time to the controller, and the controller is used to determine whether to issue a warning signal according to the electrical signal, the collection time and the working time, and / or control the medium conveying power component (300) to stop working; The detection component (500) comprises a reaction pool (510) whose bottom surface is inclined at a preset angle, an optical detection module (520) arranged on the bottom side of the reaction pool (510) and used to form a light detection channel at the bottom of the reaction pool (510), an input port (530) opened on the reaction pool (510) at a preset height and connected to the outflow component (400), and an air-connecting part connected to the reaction pool (510) and used to communicate with the outside world.

2. The in-situ water quality analyzer according to claim 1, characterized in that: The feedback component (200) comprises a liquid sensor and a time recording unit. The liquid sensor is used to collect electrical signal one when there is no liquid in the output end of the flow path switching control component (100), or to collect electrical signal two when there is liquid in the output end of the flow path switching control component (100). The time recording unit is used to record the time when the liquid sensor collects electrical signal two, the time when the medium conveying power component (300) starts to work, and the time when the medium conveying power component (300) extracts a preset volume of liquid.

3. The in-situ water quality analyzer according to claim 1, characterized in that: The optical detection module (520) comprises a mounting base (521) arranged outside the reaction pool (510), a composite light source (522) arranged outside the first bottom side of the reaction pool (510) for independently emitting multi-band light sources, and an optical signal detector (523) arranged outside the second bottom side of the reaction pool (510) and opposite to the composite light source (522) for detecting an optical signal emitted by the light source.

4. The in-situ water quality analyzer according to claim 1, characterized in that: The flow path switching control component (100) is a multi-valve group, which includes straight-through pipelines respectively connected to the reflux component (600) and the detection component (500), and multi-way valve ports arranged on the straight-through pipelines for respectively controlling whether a plurality of detection media and air can flow into the straight-through pipelines.

5. The in-situ water quality analyzer according to claim 1, characterized in that: The in-situ water quality analyzer further comprises a control valve five (810) arranged on the outflow component (400), a cadmium column (820) connected to the control valve five (810), a reflux pipe connected to the output end of the cadmium column (820) and the input end of the reaction tank (510), a control valve six (830) arranged on the reflux pipe, and a waste liquid collection pipe one (840) connected to the control valve six (830). The control valve five (810) is used to connect the outflow component (400) to the flow path switching control component (100) and the reaction tank (510), or to connect the outflow component (400) to the flow path switching control component (100) and the cadmium column (820), and the control valve six (830) is used to connect the cadmium column (820) and the reaction tank (510), or to connect the cadmium column (820) and the waste liquid collection pipe one (840).

6. The in-situ water quality analyzer according to any one of claims 1 to 5, characterized in that: The air-conducting component includes an air-conducting pipe connected to the reaction tank (510) and a control valve (540) arranged on the air-conducting pipe.

7. The in-situ water quality analyzer according to any one of claims 1 to 5, characterized in that: The sewage discharge component (700) further includes a control valve three (710) arranged on the reflux component (600) and a sewage main pipe connected to the control valve three (710), a control valve four (720) arranged on the sewage main pipe, a waste liquid collection pipe two (730) connected to the control valve four (720), and a waste liquid straight discharge pipe (740) connected to the control valve four (720).

8. A water quality analysis method, characterized in that: The in-situ water quality analyzer according to any one of claims 1 to 7 comprises the following steps: S1, the controller controls the medium conveying power component (300) to work, controls the water sample to be drawn into the reaction pool (510) through the flow path switching control component (100), and then controls the reagent required for detection to be drawn into the closed circulation loop through the flow path switching control component (100), and then pushes the reagent in the closed circulation loop into the reaction pool (510) by extracting air; S2, the controller controls the medium conveying power assembly (300) to operate so that the unmixed water sample and reagent in the reaction pool (510) are fully circulated, mixed and reacted in the closed circulation flow path; S3, the controller controls the medium conveying power assembly (300) to work, and pushes the mixed liquid in the closed circulation flow path into the reaction pool (510) by extracting air, and then the optical detection module (520) turns on the corresponding monochromatic light source according to the parameter to be detected, so as to form a light detection channel in the reaction pool (510) to detect the mixed liquid in the reaction pool (510); S4, the controller controls the medium conveying power component (300) to operate so that the waste liquid in the reaction tank (510) is discharged to the sewage discharge component (700).

9. The water quality analysis method according to claim 8, characterized in that: Step S4 further includes the following steps: S5, the controller controls the medium conveying power component (300) to work, controls the cleaning liquid to be drawn into the closed circulation loop through the flow path switching control component (100) to circulate, and then controls the air to be drawn into the closed circulation loop through the flow path switching control component (100) to discharge the cleaning liquid into the sewage discharge component (700) through the air; S6, repeating steps S1-S5 until the detection of multiple parameters is completed.

10. The water quality analysis method according to claim 9, characterized in that: When detecting phosphate, sodium molybdate reagent is used, and when detecting nitrate nitrogen, vanadium chloride reagent is used.

Images