CN116202979A - Water quality on-line analysis device based on ultraviolet spectroscopy - Google Patents

Abstract

The invention discloses a water quality online analysis device based on ultraviolet spectroscopy, which relates to the technical fields of instrument science and technology, control science, environmental protection and applied chemistry, and comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and online measurement system; the automatic sampling dilution system comprises an automatic sampling unit and an automatic dilution unit, wherein the automatic sampling unit and the automatic dilution unit are used for mixing and diluting the sample liquid and distilled water; the spectrum measuring system is used for carrying out ultraviolet spectrum measurement on the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit; the singlechip control system is used for automatically controlling the electric elements and the valve body in the automatic sampling dilution system; the data transmission and online measurement system is respectively and electrically connected with the signal processing end of the spectrum measurement system and the singlechip control system. The invention can finally realize real-time online measurement of spectrum data and can monitor and early warn sudden water pollution accidents.

Description

A water quality online analysis device based on ultraviolet spectroscopy

technical field

The invention relates to the fields of instrument science and technology, control science, environmental protection and applied chemistry technology, and more specifically relates to an on-line water quality analysis device for industrial and agricultural wastewater and urban domestic sewage.

Background technique

As we all know, water is not only an indispensable natural resource for the development of human society, but also the material basis for the survival of human beings and all living things. However, with the rapid development of social economy and the rapid growth of population, the discharge of industrial and agricultural wastewater and urban domestic sewage has increased sharply, which has caused the original scarce surface water resources to be greatly polluted, and water pollution incidents and sudden water pollution accidents are frequent. This has sounded the alarm for water quality safety.

Water pollution usually means that some indicators of the water body exceed the normal standard. If the alarm and treatment cannot be carried out in time, it will cause serious consequences. In 2007, due to the cyanobacteria outbreak caused by the eutrophication of Taihu Lake, residents could not drink tap water normally. At this stage, the water quality status of my country's urban water supply system is not optimistic.

Usually, emergency monitoring of water environmental pollution sources (Emergency Monitoring) is mainly based on a single instrument using intermittent methods for off-line, non-real-time detection, or even off-line monitoring of manual regular patrol sampling and laboratory analysis. These methods have a long detection cycle, limited water areas, and lack of early warning mechanisms for water quality changes. It is difficult to grasp the changes in water quality over time, and it cannot meet the needs of water environment monitoring departments for water resource protection, supervision, and management. In order to avoid the occurrence of water pollution incidents as much as possible and to deal with them in time to prevent further expansion of the impact area, it is necessary to monitor water quality in real time, obtain real-time water quality data, and correctly evaluate water quality safety.

Statistics show that organic pollution often accounts for a large proportion of the pollution problems facing my country's water environment. Establishing an organic matter monitoring system in key pollution sources and observation sites is a feasible measure for real-time monitoring of water quality organic matter. The previous off-line detection methods of water quality are generally based on laboratory detection methods. Although the measurement is accurate, there are shortcomings such as long measurement cycle and difficult sampling. For this reason, the development and application of water quality online monitoring technology and system have received extensive attention.

At present, the commonly used online water quality monitoring methods are based on different detection principles, mainly including chemical methods, chromatography methods, biological methods, etc. In the analysis process, there are shortcomings such as long analysis time, high detection cost, many reagents, complicated operation, easy to cause secondary pollution, and difficult to meet the online monitoring requirements.

With the continuous development of molecular spectroscopy technology, ultraviolet-visible light spectroscopy has been more and more used in the field of water quality monitoring. The basic principle is to judge whether there is any abnormality in the water quality by monitoring the changes in the ultraviolet spectrum of the water quality according to the different absorption peaks of the substances under the ultraviolet spectrum.

Compared with other analytical methods, UV-Vis spectroscopy has the following advantages for water quality monitoring:

(1) There is no need to use chemical trial production, so secondary pollution is avoided;

(2) Water samples do not require or rarely require pretreatment. The structure of the UV monitor is relatively simple, which reduces the cost of operation and maintenance;

(3) The detection is rapid and can meet the needs of online monitoring. At the same time, based on the response of organic substances to ultraviolet spectroscopy, multiple parameters such as COD and nitrate can be detected at the same time.

Therefore, how to provide an online water quality analysis device based on ultraviolet spectroscopy is an urgent problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the present invention provides an online water quality analysis device based on ultraviolet spectroscopy, aiming to solve the above technical problems.

In order to achieve the above object, the present invention adopts the following technical solutions:

A water quality online analysis device based on ultraviolet spectroscopy, including: automatic sampling dilution system, spectral measurement system, single-chip microcomputer control system, data transmission and online measurement system;

The automatic sampling dilution system includes an automatic sampling unit and an automatic dilution unit, and the automatic sampling unit and the automatic dilution unit are used for mixing and diluting sample liquid and distilled water;

The spectral measurement system is used to measure the ultraviolet spectrum of the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit;

The single-chip microcomputer control system is used to automatically control the electrical components and valve body in the automatic sampling dilution system;

The data transmission and on-line measurement system is electrically connected to the signal processing end of the spectral measurement system and the single-chip microcomputer control system respectively.

Through the above technical scheme, the present invention includes four parts: automatic sampling and dilution system, spectral measurement system, single-chip microcomputer control system, data transmission and online measurement system, and realizes automatic sampling, automatic ratio dilution, automatic measurement, Automatic cleaning and other functions; by detecting the change of the spectrogram, the change of the concentration of pollutants in the water can be monitored in real time. The present invention combines the single-chip microcomputer control system with the main interface of online measurement, and finally realizes the real-time online measurement of spectral data, which can detect sudden Monitoring and early warning of water pollution accidents plays an important role in the prevention and control of water pollution.

Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the sample liquid provided by the automatic sampling unit and the distilled water provided by the automatic dilution unit are diluted by a mixing and dilution unit.

Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, the mixing and dilution unit includes a mixing sampling tank, and an agitator for stirring, and the mixing sampling tank has a sewage pipeline and a sampling pipeline , the sewage discharge pipeline is connected to a sewage pool, and the sampling pipeline is connected to the solution receiving end of the spectral measurement system.

Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the automatic sampling unit communicates the sample pool with the mixed sampling pool through a pump and valve cooperation structure, and the sample pool is connected with the mixed sampling pool There is a sampling quantitative tube on the communication pipeline, and a first liquid level sensor is installed in the sampling quantitative tube.

Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the automatic dilution unit communicates the distilled water pool with the mixed sampling pool through a pump and valve cooperation structure, and the sample pool is connected with the mixed sampling pool There is a water inlet quantitative cup on the communication pipeline, and a second liquid level sensor is installed in the water inlet quantitative cup.

Preferably, in the above-mentioned water quality online analysis device based on ultraviolet spectroscopy, the inlet of the sampling quantitative tube is connected with the distilled water pool through a pump and a valve matching structure, and the outlet of the sampling quantitative tube is connected through a valve body Connect the cesspool.

Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the spectral measurement system includes a light source, an optical path unit, a spectroscopic unit, a filter and a sample chamber arranged in sequence, and the sample chamber is used to receive mixed diluted liquid, the spectral measurement system also includes a photoelectric conversion detection unit for detecting the mixed diluted liquid, and a processor electrically connected to the photoelectric conversion detection unit, the processor is connected to the data transmission and online The measurement system is electrically connected.

Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the single-chip microcomputer control system 51 is a single-chip microcomputer, and a motor drive unit and a valve group drive unit are respectively electrically connected to the 51 single-chip microcomputer.

Preferably, in the above-mentioned online water quality analysis device based on ultraviolet spectroscopy, the data transmission and online measurement system includes an electrically connected server and a monitoring computer.

It can be seen from the above-mentioned technical solutions that, compared with the prior art, the present invention discloses a water quality online analysis device based on ultraviolet spectroscopy, through a simple, reliable and economical ultraviolet spectroscopy water quality online analysis device, realized It has functions such as automatic sampling and dilution, automatic measurement, and automatic cleaning of pollutants in water; and can observe changes in water concentration in real time according to the peak value of the spectrum, which plays an important role in the prevention and control of water pollution.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Accompanying drawing of Fig. 1 is the structural representation of the water quality on-line analysis device based on ultraviolet spectrometry provided by the present invention;

Accompanying drawing of Fig. 2 is the single-chip microcomputer control program software structure flowchart provided by the present invention;

Accompanying drawing of Fig. 3 is the specific operation step structure flowchart of the ultraviolet spectrum on-line analysis system provided by the present invention;

FIG. 4 is a structural diagram of the optical path system of the spectrum measurement system provided by the present invention.

in:

in:

1-sample pool; 2-sampling peristaltic pump; 3-sampling filter; 4-sampling solenoid valve; 5-flushing/venting solenoid valve; 6-flushing peristaltic pump; 7-sampling quantitative cup; 8-th 1-liquid level sensor; 9-second liquid level sensor; 10-sample discharge solenoid valve; 11-stirrer; 12-water inlet quantitative cup; 13-water inlet solenoid valve; 14-water inlet peristaltic pump; 15-sample Solenoid valve; 16-water solenoid valve; 17-distilled water pool; 18-mixed sampling pool; 19-sewage pool; 20-drainage solenoid valve; 21-sampling solenoid valve; 22-sampling quantitative tube; -light source; 25-optical path unit; 26-splitting unit; 27-filter; 28-sample chamber; 29-photoelectric conversion detection unit; 30-processor; 31-first data line; 32-server; 33-the first Two data lines; 34-monitoring computer; 35-51 single-chip microcomputer; 36-motor drive unit and valve group drive unit; 37-tungsten lamp; 38-deuterium lamp; 42-incident slit; 43-exit slit; 44-collimator; 45-grating; 46-objective lens;

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to accompanying drawing 1, the embodiment of the present invention discloses a water quality online analysis device based on ultraviolet spectroscopy, including: automatic sampling dilution system, spectral measurement system, single-chip microcomputer control system, data transmission and online measurement system;

The automatic sampling and dilution system includes an automatic sampling unit and an automatic dilution unit, which are used for mixing and diluting sample liquid and distilled water;

The spectral measurement system is used to measure the ultraviolet spectrum of the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit;

The single-chip microcomputer control system is used to automatically control the electrical components and valve body in the automatic sampling dilution system;

The data transmission and on-line measurement system are respectively electrically connected to the signal processing end of the spectrum measurement system and the single-chip microcomputer control system.

Specifically, the automatic sampling dilution system includes: sample pool 1, sampling peristaltic pump 2, sampling filter 3, sampling solenoid valve 4, flushing/venting solenoid valve 5, flushing peristaltic pump 6, sampling quantitative cup 7, the First liquid level sensor 8, second liquid level sensor 9, sample discharge solenoid valve 10, stirring motor 11, water inlet quantitative cup 12, water inlet solenoid valve 13, water inlet peristaltic pump 14, sample matching solenoid valve 15, water discharge solenoid valve 16. Distilled water tank 17, mixed sampling tank 18, sewage tank 19, sewage solenoid valve 20, sampling solenoid valve 21, sampling quantitative tube 22 and sampling solenoid valve 23.

The sample pool 1 is sequentially connected with the sampling peristaltic pump 2, the sampling filter 3, the sampling solenoid valve 4, the sampling quantitative cup 7 and the sampling solenoid valve 10; the sampling quantitative cup 7 is in turn connected with the flushing/venting solenoid valve 5 1. Rinsing peristaltic pump 6 links to each other with distilled water tank 17; Distilled water tank 17 links to each other with water inlet peristaltic pump 14, water inlet electromagnetic valve 13 and inlet water quantitative cup 12 successively; The top of mixing sampling pool 18 is connected with sample matching electromagnetic valve 15, water discharge electromagnetic valve 16 is connected with the stirring motor 11; the bottom of the mixed sampling tank 18 is connected with a sewage tank 19, a sewage solenoid valve 20, a sampling solenoid valve 21, a sampling quantitative tube 22 and a sampling solenoid valve 23, a first liquid level sensor 8 and a second liquid level sensor 9 links to each other with sample injection quantitative tube 7 and water inlet quantitative cup 12 respectively.

Single-chip microcomputer control system comprises 51 single-chip microcomputers 35, motor drive unit and valve group drive unit 36; Single-chip microcomputer 35 links to each other with motor drive unit and valve group drive unit 36; Empty solenoid valve 5, water inlet solenoid valve 13, sample discharge solenoid valve 10, stirring motor 11, sample matching solenoid valve 15, water discharge solenoid valve 16, blowdown solenoid valve 20, sampling solenoid valve 21 and sampling solenoid valve 23 are connected.

As shown in FIGS. 1 and 4 , the spectral measurement system includes a light source 24 , an optical path unit 25 , a spectroscopic unit 26 , an optical filter 27 , a sample chamber 28 , a photoelectric conversion detection unit 29 and a processor 30 . The light source 24 is connected with the optical path unit 25 , the spectroscopic unit 26 , the optical filter 27 , the sample chamber 28 , the photoelectric conversion detection unit 29 and the processor 30 in sequence.

The data transmission and online measurement system includes a first data line 31 , a server 32 , a second data line 33 and a monitoring computer 34 . The server 32 is connected to the processor 30 through the first data line 31, and the server 32 is connected to the monitoring computer 34 through the second data line 33, and the monitoring computer 34 is connected to the 51 single-chip microcomputer 35.

The flow chart of the specific operating steps of the ultraviolet spectrum online analysis system is shown in Figure 3: the second liquid level sensor 9 sends an interrupt signal, 51 single-chip microcomputer 35 sends an instruction, and then the monitoring computer 34 controls the water inlet peristaltic pump 14 through 51 single-chip microcomputer 35, and then The water solenoid valve 13, the water solenoid valve 16, the stakeout solenoid valve 21 and the sampling solenoid valve 23, add quantitative distilled water in the mixed sampling pool 18 according to the demand, and measure the reference spectrum; the first liquid level sensor 8 sends an interrupt signal, 51 single-chip microcomputer 35 Instructions are issued, and then the monitoring computer 34 controls the peristaltic pump 2 through the 51 single-chip microcomputer 35, the sampling solenoid valve 4, the sample matching solenoid valve 15, the lofting solenoid valve 21, the sampling solenoid valve 23 and the agitator 11, and the quantitative sample solution is added to the mixed sampling pool In 18, the spectrogram is measured after uniform mixing, and the obtained spectrogram is saved. While saving the spectral data, the spectrogram of the current sample liquid is displayed in real time for subsequent processing. Finally, the mixed solution is drained and the mixed sampling tank 18 is cleaned. If it is necessary to measure sample liquids with different concentrations, the next measurement cycle needs to be performed.

Referring to accompanying drawing 4, in the spectrum measuring system that present embodiment provides, light source 24 adopts tungsten lamp 37 and deuterium lamp 38, and tungsten lamp 37 and deuterium lamp 38 reflect light source reflector 39 and pass through condenser mirror 40 on the spectroscope 41 The incident slit 42 enters the beam splitter 41 , is reflected by the collimator 44 , the grating 45 and the objective lens 46 , passes through the filter 27 and exits the exit slit 43 , and acts on the sample chamber 28 through the exit mirror 48 .

Example 1:

As shown in Figure 1, the solenoid valve shown in the figure adopts a two-position two-way miniature series direct-acting solenoid valve, the solenoid valve model is SLP1-3b, and the flow diameter is 2.5mm; The speed is 100r/min; the sensor adopts XKC-Y26-V non-contact pipeline liquid level sensor; sample pool 1, distilled water pool 17, sample injection quantitative cup 7, water inlet quantitative cup 12, mixed sampling pool 18 and sewage pool 19 All are plexiglass; the pipe material is silicone tube; the peristaltic pump adopts Baoding Lange BT100-2J precision peristaltic pump; the motor drive unit and valve group drive unit adopt EM222 relay output; the stirring rod and stirring blade of the stirrer 11 are both made of 304 Stainless steel; the coupling between the motor and the stirring rod is made of aluminum alloy, with an inner hole of 4-8mm.

In the production process of β-phenylethylamine PEA, NaOH is usually used as the reactant, and the product often contains NaCl. Finally, the mixture containing these three substances is discharged into the water, which has seriously polluted the water quality. Therefore, real-time and online monitoring of the concentration of the mixture of the three is of great significance for us to reduce pollution and protect the safety of surface water.

The specific online analysis steps are as follows:

Step 1: Quantitative preparation of distilled water and measurement of reference spectrum: close the water discharge solenoid valve 16, open the water inlet solenoid valve 13 and the water inlet peristaltic pump 14, set the position of the second liquid level sensor 9, and the distilled water flows through the water inlet peristaltic pump in turn. The pump 14 and the water inlet solenoid valve 13 enter the water inlet quantitative cup 12. After the second liquid level sensor 9 detects the liquid level position, the second liquid level sensor 9 sends an interrupt signal, and the 51 single-chip microcomputer 35 sends an instruction to close the water inlet. Peristaltic pump 14 and water inlet solenoid valve 13, and open water release solenoid valve 16, after the distilled water enters the mixed sampling pool 18, measure the reference spectrum.

Step 2: Automatic quantitative sampling of the sample liquid of the mixture of PEA, NaOH and NaCl: turn on the sampling peristaltic pump 2 and the sampling solenoid valve 4, set the position of the first liquid level sensor 8, and the sample liquid flows through the sampling peristaltic The pump 2, the sampling filter 3 and the sampling solenoid valve 4 enter the sampling quantitative cup 7, and after the first liquid level sensor 8 detects the liquid level position, the first liquid level sensor 8 sends an interrupt signal, and the 51 single-chip microcomputer 35 sends an instruction to close the sampling peristaltic pump 2 and the sampling solenoid valve 4, and the quantitative sampling of the sample liquid is completed.

Step 3: automatic dilution and mixing of the sample solution: open the sample mixing solenoid valve 15, so that the sample solution in the sample injection quantitative cup 7 flows into the mixed sampling pool 18; at the same time, turn on the agitator 11, so that the distilled water and the sample solution are evenly mixed, and the automatic dilution is completed .

Step 4: UV spectrum measurement: After the solution is mixed evenly, close the agitator 11, open the sample opening solenoid valve 21, wait for the sample liquid to fill the sampling quantitative tube 22, close the lofting solenoid valve 21, open the sampling solenoid valve 23, and wait for the sample liquid to fill the sample chamber 28, turn on the light source 24, the ultraviolet light passes through the optical path unit 25, the spectroscopic unit 26, the optical filter 27, the sample chamber 28, the photoelectric conversion detection unit 29 and the processor 30, and the spectral data converted by the processor 30 passes through the first The data line 31 is transmitted to the server 32, and then transmitted to the monitoring computer 34 via the second data line 33. While saving the spectral data, the current sample liquid spectrum is displayed in real time for subsequent processing. If the measured absorbance of the characteristic peak of the ultraviolet spectrum is greater than 4.0, it is necessary to increase the amount of distilled water added; if the measured absorbance of the characteristic peak of the ultraviolet spectrum is less than 0.2, it is necessary to increase the amount of sample solution added.

Step five: blowdown and cleaning of the mixed solution: open the blowdown electromagnetic valve 20, flow all the mixed solution into the sewage pool 19, and then close the blowdown electromagnetic valve 20. Open the water inlet solenoid valve 13 and the water discharge solenoid valve 16 to allow water to enter the mixed sampling tank 18, and open the agitator 11 for cleaning. After cleaning, close the water inlet solenoid valve 13 and the water discharge solenoid valve 16, then open the sewage discharge solenoid valve 20 to drain the sewage, and close the agitator 11 after completion. Then, the flushing/venting solenoid valve 5 and the sample discharge solenoid valve 10 are opened, so that water enters the sample injection quantitative cup 7 to clean the sample injection quantitative cup 7, and the sewage enters the sewage tank to be discharged. Then wait for the next measurement cycle.

Step 6: Spectral data preprocessing and human-computer interaction interface display: save the collected spectral data to the computer, and establish a spectral data database, and obtain the preprocessed spectrogram through preprocessing methods such as smoothing, wavelet transform, and baseline correction. The overall change of the mixed liquid is detected in real time, and finally displayed through the GUI human-computer interaction interface written in matlab, as shown in Figure 2, for operators to use.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant details, please refer to the description of the method part.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. An online water quality analysis device based on ultraviolet spectroscopy is characterized by comprising: the system comprises an automatic sampling dilution system, a spectrum measurement system, a singlechip control system and a data transmission and online measurement system;

the automatic sampling dilution system comprises an automatic sampling unit and an automatic dilution unit, wherein the automatic sampling unit and the automatic dilution unit are used for mixing dilution of sample liquid and distilled water;

the spectrum measuring system is used for carrying out ultraviolet spectrum measurement on the mixed dilution liquid formed by the automatic sampling unit and the automatic dilution unit;

the singlechip control system is used for automatically controlling the electric elements and the valve body in the automatic sampling dilution system;

the data transmission and online measurement system is respectively and electrically connected with the signal processing end of the spectrum measurement system and the singlechip control system.

2. The device for on-line analysis of water quality based on ultraviolet spectroscopy according to claim 1, wherein the sample liquid provided by the automatic sampling unit and the distilled water provided by the automatic dilution unit are diluted by the mixing dilution unit.

3. The ultraviolet spectroscopy-based water quality online analysis device according to claim 2, wherein the mixing dilution unit comprises a mixing sampling tank and a stirrer for stirring, the mixing sampling tank is provided with a sewage draining pipeline and a sample feeding pipeline, the sewage draining pipeline is connected with the sewage tank, and the sample feeding pipeline is connected with a solution receiving end of the spectrum measurement system.

4. The ultraviolet spectroscopy-based water quality online analysis device according to claim 3, wherein the automatic sampling unit is used for communicating the sample tank with the mixed sampling tank through a pump and valve matching structure, a sample introduction metering tube is arranged on a communicating pipeline of the sample tank and the mixed sampling tank, and a first liquid level sensor is arranged in the sample introduction metering tube.

5. The ultraviolet spectroscopy-based water quality online analysis device according to claim 4, wherein the automatic dilution unit is used for communicating the distilled water tank with the mixed sampling tank through a pump and valve matching structure, a water inlet quantitative cup is arranged on a communicating pipeline of the mixed sampling tank and the sample tank, and a second liquid level sensor is arranged in the water inlet quantitative cup.

6. The ultraviolet spectroscopy-based water quality online analysis device according to claim 5, wherein the inlet of the sample injection quantitative pipe is communicated with the distilled water tank through a pump and valve matching structure, and the outlet of the sample injection quantitative pipe is connected with the sewage tank through a valve body.

7. The ultraviolet spectroscopy-based water quality online analysis device according to any one of claims 1-6, wherein the spectrum measurement system comprises a light source, a light path unit, a light splitting unit, a light filter and a sample chamber which are sequentially arranged, the sample chamber is used for receiving mixed dilution liquid, the spectrum measurement system further comprises a photoelectric conversion detection unit used for detecting the mixed dilution liquid, and a processor electrically connected with the photoelectric conversion detection unit, and the processor is electrically connected with the data transmission and online measurement system.

8. The device of any one of claims 1-6, wherein the single-chip microcomputer control system 51 comprises a single-chip microcomputer, and a motor driving unit and a valve group driving unit which are electrically connected with the single-chip microcomputer respectively.

9. The ultraviolet spectroscopy-based water quality online analysis device of any one of claims 1-6, wherein the data transmission and online measurement system comprises a server and a monitoring computer which are electrically connected.

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