CN219016066U - Water quality on-line monitor and water quality on-line monitoring system - Google Patents

Abstract

The utility model relates to the technical field of analysis and detection instruments and discloses a water quality on-line monitor and a water quality on-line monitoring system. The water quality on-line monitor comprises: a chip storage unit configured to be capable of storing or carrying a plurality of microfluidic chips (10); the transmission module (30) can move the microfluidic chip from the chip storage unit to a detection position and move the detected microfluidic chip out of the detection position; and an optical module (40) capable of detecting a solution in a detection cell of the microfluidic chip located at the detection site. The transmission module can move the micro-fluidic chip from the chip storage unit to the detection position, and move the detected micro-fluidic chip out of the detection position, the chip is disposable, cross contamination among samples caused by residues does not exist, and the transmission module can be applied to places such as an enterprise sewage outlet and the like where the quality of water body needs to be monitored.

Description

Water quality on-line monitor and water quality on-line monitoring system

Technical Field

The utility model relates to the technical field of analysis and detection instruments, in particular to an on-line water quality monitor. On the basis, the water quality online monitoring system is also related.

Background

At present, on-line water quality detection equipment mainly adopts a flow injection analysis method. Flow injection analysis (Flow Injection Analysis, abbreviated as FIA) is a novel continuous flow analysis technique proposed by denmark chemists ruzika (Ruzicka J) and Hansen (Hansen E H) in 1974. The technology is to inject a certain volume of sample solution into a flowing, non-air-spaced reagent solution (or water) carrier, the injected sample solution flows into a reaction coil to form a region, and the region is mixed and reacted with the reagent in the carrier, and then enters a flow-through detector for measurement, analysis and recording. Since the sample solution is dispersed in the reagent carrier under the strictly controlled condition, the concentration of the substance to be measured in the sample solution can be measured from the working curve drawn from the standard solution by the comparison method without requiring the reaction to reach the equilibrium state as long as the conditions such as the residence time in the pipe, the temperature and the dispersion process are the same in the sample solution injection method.

The common problems of the online water quality analysis equipment are as follows: 1. the single-parameter detection is taken as the main part, a large number of injection pumps and switch valves are required to be integrated in the multi-parameter detection, the system structure is complex, the cost is high, the later maintenance is difficult, and the technical and market requirements of the current water quality monitoring and early warning network on the low-cost, high-precision and multi-parameter water quality on-line monitoring instrument are not met; 2. because the same tubing and module are used repeatedly, a rinse is required between each test to thoroughly remove sample residue, and cross-contamination may occur when the rinse is off-specification. Further, contamination, clogging, etc. may cause volumetric errors. Substances such as crystallization or turbidity, color and the like generated in the use process of the online analyzer can appear on detection components such as a reaction tank, a pump pipe and the like, and if the operation and the maintenance are not in place in a flat time, the actual volume of a sample can be caused to have errors due to incomplete cleaning, so that the chromaticity of a reacted mixed reagent is deepened. Meanwhile, the chemical property of the reagent is affected, and finally, an inaccurate measurement result is generated by the instrument; 3. the detection reagent required by certain parameters has great environmental pollution, such as a COD reagent measured by a chromium method, and additional waste liquid treatment is required.

The microfluidic chip has the characteristics of microminiaturization and integration, can integrate complex functions on a small chip, and has been widely applied to the fields of in-vitro diagnosis, environment detection and food safety. Researches on water quality detection by utilizing a microfluidic technology have been reported, but the microfluidic technology is mainly in the form of a chip and portable equipment, and the disclosures of the microfluidic technology applied to online water quality equipment are extremely limited. In the prior publications, for example, a microfluidic ammonia nitrogen monitoring flow path system disclosed in the Chinese patent application No. 201821968566.3, a microfluidic chip system for rapidly detecting chemical oxygen demand on line disclosed in the Chinese patent application No. 201610216246.1, a water quality on-line monitoring system disclosed in the Chinese patent application No. 201110235958.5, and a preparation method thereof are disclosed, and the microfluidic chip is used as a substitute of the existing reaction and mixing module to play roles of enhancing mixing or heat transfer and reducing the volumes of equipment and reagents, so that the problems of cross contamination, need to store all liquid reaction reagents and the like in the existing flow injection method are not overcome.

Disclosure of Invention

The utility model aims to solve the problem of cross contamination in a flow injection method in the prior art, and provides an on-line water quality monitor which can avoid cross contamination in the water quality detection process.

In order to achieve the above object, an aspect of the present utility model provides an on-line water quality monitor, comprising: a chip storage unit configured to be capable of storing or carrying a plurality of microfluidic chips; the transmission module can move the microfluidic chip from the chip storage unit to a detection position and move the detected microfluidic chip out of the detection position; and an optical module capable of detecting a solution in a detection cell of the microfluidic chip located at the detection site.

Optionally, the water quality on-line monitor further comprises an automatic sample injection module for injecting the liquid to be detected onto the microfluidic chip, wherein the automatic sample injection module comprises a sample injection port, a sample outlet and a flow control unit connected between the sample injection port and the sample outlet through a pipeline, and the flow control unit is configured as a pump with a flow or flow rate control function.

Optionally, the microfluidic chip is configured to be longitudinally stacked in the chip storage unit, the transmission module includes a mechanical arm and a central rotating shaft, the mechanical arm can move the microfluidic chip located at the uppermost position in the chip storage unit onto the central rotating shaft, and move the microfluidic chip located on the central rotating shaft out of the central rotating shaft, and the central rotating shaft can rotate around its own longitudinal axis, so as to allow the optical module to detect solutions in the detection tanks located at circumferentially different positions of the microfluidic chip.

Optionally, the microfluidic chip is configured to be longitudinally stacked in the chip storage unit, the transmission module includes a pushing-in unit and a pushing-down unit that is pressed against the microfluidic chip at the top in the chip storage unit, the pushing-in unit can push the microfluidic chip at the bottom in the chip storage unit into the detection position, and the pushing-down unit can push the microfluidic chip above into the empty and absent position after the microfluidic chip at the bottom is pushed out.

Optionally, the chip storage unit is configured as a disc, the microfluidic chips are arranged on the disc at intervals along the circumferential direction of the disc, and the transmission module is configured as a rotating mechanism, and the rotating mechanism can enable the disc to rotate around the longitudinal axis of the disc, so that the microfluidic chips to be detected are rotated into the detection position, and the detected microfluidic chips are rotated out of the detection position.

Optionally, the optical module comprises a light source and an optical detector connected through an optical fiber, and the optical detector can receive the light emitted by the light source and passing through the detection cell.

Optionally, the optical module includes a collimation module, a monochromator, and a spectroscopic module.

Optionally, a plurality of detection cells are formed on the microfluidic chip, and the optical module is capable of moving and detecting solutions in different detection cells.

The utility model further provides a water quality on-line monitoring system, which comprises the water quality on-line monitor and a plurality of micro-fluidic chips stored or carried in the chip storage unit, wherein a flow channel for flowing liquid to be detected and a detection pool communicated with the flow channel are formed on the micro-fluidic chips, reagents are preset on the flow channel, and the liquid to be detected can flow into the detection pool after reacting with the reagents in the flow channel.

Through the technical scheme, the transmission module can move the micro-fluidic chip from the chip storage unit to the detection position, and move the detected micro-fluidic chip out of the detection position, and the chip is disposable and has no cross contamination among samples caused by residues. In addition, the water quality on-line monitor has the advantages of simplified structure, reduced reagent and lower cost than the existing on-line analysis equipment, can replace the traditional water quality detection equipment, can be applied to places needing on-line monitoring of water quality such as the sewage outlet of enterprises, and is particularly suitable for the scene needing to collect a plurality of water quality index information.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the apparatus composition and flow of the water quality on-line monitor of the present utility model;

FIG. 2 is a schematic diagram of an autosampler module according to the present utility model;

FIG. 3 is one embodiment of a storage unit and a transmission module;

FIG. 4 is another embodiment of the transmission module of FIG. 3;

fig. 5 is another embodiment of a storage unit.

Description of the reference numerals

10-a microfluidic chip; 20-an automatic sample injection module; 21-a sample inlet; 22-a sample outlet; 23-piping; 24-a flow control unit; 30-a transmission module; 31-a mechanical arm; 32-a central spindle; 33-pushing-in unit; 34-a pressing unit; 40-an optical module; 41-optical fiber; 42-a light source; 43-optical detector; 51-disc.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model. In the present utility model, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to refer generally to the orientation shown in the drawings.

In one aspect, the present utility model provides an on-line water quality monitor, comprising: a chip storage unit configured to be capable of storing or carrying a plurality of microfluidic chips 10; the transmission module 30 is capable of moving the microfluidic chip 10 from the chip storage unit to a detection position, and moving the detected microfluidic chip 10 out of the detection position; and an optical module 40, wherein the optical module 40 can detect the solution in the detection cell of the microfluidic chip 10 at the detection position.

The transmission module in the utility model can move the micro-fluidic chip 10 from the chip storage unit to the detection position, and move the detected micro-fluidic chip 10 out of the detection position, and the chip is disposable, so that cross contamination among samples caused by residues does not exist. In addition, the water quality on-line monitor has the advantages of simplified structure, reduced reagent and lower cost than the existing on-line analysis equipment, can replace the traditional water quality detection equipment, can be applied to places needing on-line monitoring of water quality such as the sewage outlet of enterprises, and is particularly suitable for the scene needing to collect a plurality of water quality index information.

As shown in fig. 2, the on-line water quality monitor further includes an automatic sample injection module 20 for injecting the liquid to be tested into the detection cell of the microfluidic chip 10, the automatic sample injection module 20 includes a sample inlet 21, a sample outlet 22, and a flow control unit 24 connected between the sample inlet 21 and the sample outlet 22 through a pipeline 23, and the flow control unit 24 is configured as a pump with a flow or flow rate control function. The flow control unit 24 may be a peristaltic pump, a plunger pump, or other pumps with flow or flow rate control function, and the sample outlet 22 is configured as a liquid outlet capable of being tightly combined with a liquid inlet reserved on the microfluidic chip 10, and may be a disposable pipette tip, or may be other non-disposable interfaces with an automatic sealing property.

As shown in fig. 3, in one embodiment of the present utility model, the microfluidic chip 10 is configured to be longitudinally stacked in the chip storage unit, the driving module 30 includes a mechanical arm 31 and a central rotation shaft 32, the mechanical arm 31 is capable of moving the microfluidic chip 10 located at the uppermost position in the chip storage unit onto the central rotation shaft 32 and moving the microfluidic chip 10 located on the central rotation shaft 32 out of the central rotation shaft 32, and the central rotation shaft 32 is capable of rotating about its own longitudinal axis to allow the optical module 40 to be capable of detecting solutions in the detection cells located at different positions in the circumferential direction of the microfluidic chip 10. Wherein the robotic arm 31 may aspirate, pick up or otherwise move the microfluidic chip 10.

As shown in fig. 4, in another embodiment of the present utility model, the microfluidic chip 10 is configured to be longitudinally stacked in the chip storage unit, the transmission module 30 includes a pushing unit 33 and a pushing unit 34 that is pressed against the microfluidic chip 10 located at the top in the chip storage unit, the pushing unit 33 can push the microfluidic chip 10 located at the bottom in the chip storage unit into the detection position, and the pushing unit 34 can press the microfluidic chip 10 located above into the empty position after the microfluidic chip 10 located at the bottom is pushed out. In this embodiment, the pushing unit 33 may push the detected microfluidic chip 10 away while pushing the microfluidic chip 10 into the detection position. Alternatively, in this embodiment, an ejecting unit that ejects the microfluidic chip 10 to the detection position may be further included. Further, in this embodiment, a rotation mechanism for rotating the microfluidic chip 10 around its longitudinal axis may be further included, so as to allow the optical module 40 to detect solutions in the detection cells located at different positions in the circumferential direction of the microfluidic chip 10.

In still another embodiment of the present utility model, as shown in fig. 5, the chip storage unit is configured as a disc 51, a plurality of the microfluidic chips 10 are disposed on the disc 51 at intervals along a circumferential direction of the disc 51, and the driving module 30 is configured as a rotation mechanism capable of rotating the disc 51 around a longitudinal axis thereof to rotate the microfluidic chips 10 to be detected into the detection position and rotate the detected microfluidic chips 10 out of the detection position. It will be appreciated that a rotation mechanism for rotating the microfluidic chip 10 about its longitudinal axis may also be included therein, so as to allow the optical module 40 to be able to detect solutions in detection cells located at circumferentially different positions of the microfluidic chip 10.

In addition, as shown in fig. 1, the water quality online monitor comprises a pretreatment module for filtering and/or extracting the liquid to be measured, a digestion module for providing temperature, pressure and/or additional reagent for the liquid to be measured, and an automatic dilution module for diluting the liquid to be measured. The pretreatment module can realize filtration or extraction of the liquid to be detected by adding a filter membrane and the like on a flow path of the liquid to be detected; when the detection method corresponding to the liquid to be detected needs high-temperature digestion (such as total phosphorus, total nitrogen, chromium method COD and the like), the digestion module provides certain temperature, pressure and additional reagent for the liquid to be detected; when the concentration of the liquid to be measured exceeds the range of the accurate quantification of the system, a certain volume of liquid can be introduced into the automatic dilution module to dilute the liquid to be measured. The pretreatment module, the digestion module and the automatic dilution module can be positioned behind the automatic sampling module and in front of the microfluidic chip reaction module, or can be positioned in front of the automatic sampling module to pretreat, digest or dilute the liquid to be tested.

Further, as shown in fig. 3 to 5, the optical module 40 includes a light source 42 and an optical detector 43 connected by an optical fiber 41, and the optical detector 43 can receive the light emitted by the light source 42 and passing through the detection cell, and calculate the concentration of the substance in the detection cell by the change of the optical signal such as absorbance. In addition, the optical module 40 may further include a collimation module, a monochromator, and a spectroscopic module to improve the sensitivity and accuracy of detection. Wherein, the wavelength range of the light source 42 can be ultraviolet, visible, infrared or the coupling of two or three of them, and the light source 42 can be an LED lamp, a tungsten lamp, a halogen tungsten lamp, a hydrogen lamp, a deuterium lamp, a xenon lamp, a silicon carbide rod, a special coil, a Nernst lamp, etc.; the optical detector 43 may be a photocell, photodiode, phototube, photomultiplier tube, CCD, CMOS, etc.

Further, as an embodiment, the microfluidic chip 10 has a plurality of detection cells formed thereon, and the optical module 40 is capable of moving and detecting solutions in different detection cells. The relation between the detection cells and the optical module 40 is many-to-one, and a relative movement needs to occur between the two during measurement, for example, in the embodiments shown in fig. 3 to 5, the optical module 40 may be fixed, and the microfluidic chip 10 may be rotated, so that the detection cells sequentially pass through the optical module 40, and a plurality of detection cells on the microfluidic chip 10 are moved to the measurement optical path one by one for detection. Likewise, in the embodiments of fig. 3 to 5, it is also possible to fix the microfluidic chip 10 and move the position of the optical module 40 so that the optical module 40 is positioned above and below different detection cells, respectively, for measurement one by one. The optical module 40 may be moved either rotationally or horizontally. Since different detection cells are solutions after different system reactions, the maximum absorption wavelength or other determined measurement wavelength may be different for each detection cell. At this time, the light source 42 may be configured as a broad spectrum light source, and the optical detector 43 may be configured as a grating, a CCD, or a CMOS full spectrum optical detector.

As shown in fig. 1, another aspect of the present utility model provides an online water quality monitoring system, which includes the online water quality monitor and a plurality of microfluidic chips 10 stored or carried in the chip storage unit, wherein a flow channel for flowing a liquid to be tested and a detection tank communicated with the flow channel are formed on the microfluidic chips 10, a reagent is preset on the flow channel, and the liquid to be tested can flow into the detection tank after reacting with the reagent in the flow channel. The water quality on-line detection system allows simultaneous detection of a plurality of parameters by adopting a small number of pumps and a simple system structure, and can complete detection by only a trace amount of reagents, thereby greatly reducing the waste liquid production. Meanwhile, the reagent is preset on the microfluidic chip 10 in advance, so that a large amount of reagent is not required to be stored in the device, the possibility of reagent deterioration is reduced, and the leakage risk of toxic and harmful reagents is reduced. In addition, the water quality online detection system can also comprise a control module, wherein the control module is used for controlling the start and stop of other modules and the like.

Wherein the chip storage unit and the plurality of microfluidic chips 10 stored or carried therein constitute a microfluidic chip reaction module. After entering from a liquid inlet reserved on the microfluidic chip 10, the liquid to be measured flows along a preset micro-flow channel, a solid or liquid reagent is preset on the channel, and after being mixed with the reagent and reacting, the liquid to be measured enters a light-transmitting detection pool inside the microfluidic chip 10. The liquid inlet on the micro-fluidic chip 10 can be communicated with 1 to 50 different flow channels, and the same reagent can be preset on different flow channels or different reagents can be preset on different flow channels. The flow channels of the same reagent are preset for detecting the content of the same substance in the liquid to be detected, the flow channels of different reagents are preset for detecting different substances or different concentration intervals of the same substance in the liquid to be detected, and the number of the detectable substances on each microfluidic chip 10 is smaller than or equal to the number of the flow channels. Wherein the microfluidic chip 10 may be circular or any other shape.

Example 1

The liquid to be measured is sucked into the pipeline 23 from the sample inlet 21 by the peristaltic pump at a certain flow rate, and is injected into the liquid inlet of the microfluidic chip 10 placed on the detection position through the sample outlet 22. The micro-fluidic chip 10 is circular, and the liquid inlet is positioned at the center of the micro-fluidic chip 10 and is communicated with 8 groups of micro-channels extending radially. Each group of micro-channels consists of a mixing area, a reaction area and a reading area, wherein the mixing area of 6 groups of micro-channels is preset with a solid ammonia nitrogen rapid detection reagent, one group is used as a blank control, and the other group is used as a light-tight detection pool for positioning. The liquid to be measured reacts with the preset reagent in the flowing process, and the color reaction is completed after the liquid enters the detection cell of the reading area for a period of time. At this time, the microfluidic chip 10 starts to rotate around the center of the circle, each detection cell sequentially passes through the optical module 40, and the optical detector 43 records the absorption condition of the light emitted by the light source 42 at 620nm after passing through each detection cell. After all the measurements are completed, the detected microfluidic chip 10 is divided from the detection displacement by the robot arm 31, and the topmost microfluidic chip 10 in the chip storage unit is sucked to be placed in the detection position.

Experimental data are recorded as follows:

example 2

An on-line water quality monitor comprises an automatic sample injection module, a digestion module, a microfluidic chip reaction module and a stacked down-pressure transmission module shown in fig. 4.

The liquid to be measured is sucked into the pipeline 23 from the sample inlet 21 by the peristaltic pump at a certain flow rate, and is injected into the liquid inlet of the microfluidic chip 10 placed on the detection position through the sample outlet 22. The reagents preset on the micro flow channels of each micro flow control chip 10 in the chip storage unit are the same, but the rapid detection reagents of COD, ammonia nitrogen and nitrate are respectively preset on the adjacent chips from top to bottom, and the rapid detection reagents circulate. According to the parameters to be detected (chromium COD, ammonia nitrogen or nitrate) corresponding to the microfluidic chip 10, the liquid to be detected can be switched into a digestion module preset with a digestion reagent through a valve to be digested at high temperature and then enter the microfluidic chip 10, or is directly injected into a liquid inlet of the microfluidic chip 10 arranged on a detection position without the digestion module. The microfluidic chip 10 may be square, and the liquid inlet is located at one side of the square and is connected to 5 groups of micro channels extending radially. Each group of micro-channels consists of a mixing area, a reaction area and a reading area. When the microfluidic chip 10 is a chromium-method COD detection chip, 4 groups of micro-channel mixing areas are preset with chromium-method COD rapid detection reagents, and 1 group of non-preset reagents are used as blank control. The liquid to be measured reacts with the preset reagent in the flowing process, and the color reaction is completed after the liquid enters the detection cell of the reading area for a period of time. At this time, the microfluidic chip 10 translates up and down, left and right according to a preset program, each detection cell sequentially passes through the optical module 40, and the optical detector 43 records the absorption condition of the light emitted by the light source 42 at 430nm after passing through each detection cell. When the microfluidic chip 10 is an ammonia nitrogen detection chip, the 4 groups of micro-channel mixing areas are preset with ammonia nitrogen rapid detection reagents, and the 1 groups of non-preset reagents are used as blank control. The liquid to be measured reacts with the preset reagent in the flowing process, and the color reaction is completed after the liquid enters the detection cell of the reading area for a period of time. At this time, the microfluidic chip 10 translates up and down, left and right according to a preset program, each detection cell sequentially passes through the optical module 40, and the optical detector 43 records the absorption condition of the light emitted by the light source 42 at 620nm after passing through each detection cell. When the microfluidic chip 10 is a nitrate detection chip, 4 groups of micro-channel mixing areas are preset with nitrate rapid detection reagents, and 1 group of non-preset reagents are used as blank control. The liquid to be measured reacts with the preset reagent in the flowing process, and the color reaction is completed after the liquid enters the detection cell of the reading area for a period of time. At this time, the microfluidic chip 10 translates up and down, left and right according to a preset program, each detection cell sequentially passes through the measurement light path, and the optical detector 43 records the absorption condition of the light emitted by the light source 42 at 550nm after passing through each detection cell. Each time after the absorbance measurement of all the detection cells is completed, the pushing unit 33 pushes the microfluidic chip 10 at the bottom in the chip storage unit into the detection position, and simultaneously pushes the detected microfluidic chip 10 out of the detection position.

Experimental data are recorded as follows:

example 3

The liquid to be measured is sucked into the pipeline 23 from the sample inlet 21 by the peristaltic pump at a certain flow rate, and is injected into the liquid inlet of the microfluidic chip 10 placed on the detection position through the sample outlet 22. The micro-fluidic chip 10 is circular, and the liquid inlet is positioned at the center of the micro-fluidic chip 10 and is communicated with 4 groups of micro-channels extending radially. Each group of micro-channels consists of a mixing area, a reaction area and a reading area, wherein 3 groups of mixing areas are respectively preset with chromium-method COD, ammonia nitrogen and nitrate rapid detection reagents, and 1 group of non-preset reagents are used as blank control. The liquid to be measured reacts with the preset reagent in the flowing process, and the color reaction is completed after the liquid enters the detection cell of the reading area for a period of time. At this time, the microfluidic chip 10 starts to rotate around the center of the circle, each detection cell sequentially passes through the optical module 40, and the optical detector 43 records the absorption condition of the light emitted by the light source 42 at 430nm, 620nm and 550nm after passing through each detection cell. After all measurements are completed, the rotating mechanism drives the disc 51 to rotate, rotating the unused microfluidic chip 10 to the detection position.

Experimental data are recorded as follows:

the preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a plurality of simple variants of the technical proposal of the utility model can be carried out, comprising that each specific technical feature is combined in any suitable way, and in order to avoid unnecessary repetition, the utility model does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (10)

1. The utility model provides a quality of water on-line monitoring appearance which characterized in that, quality of water on-line monitoring appearance includes:

a chip storage unit configured to be capable of storing or carrying a plurality of microfluidic chips (10);

the transmission module (30) can move the micro-fluidic chip (10) from the chip storage unit to a detection position, and move the detected micro-fluidic chip (10) out of the detection position; the method comprises the steps of,

-an optical module (40), the optical module (40) being capable of detecting a solution in a detection cell of the microfluidic chip (10) located at the detection site.

2. The on-line water quality monitor according to claim 1, further comprising an automatic sample injection module (20) for injecting a liquid to be measured onto the microfluidic chip (10), the automatic sample injection module (20) comprising a sample inlet (21), a sample outlet (22) and a flow control unit (24) connected between the sample inlet (21) and the sample outlet (22) by a pipeline (23), the flow control unit (24) being configured as a pump with a flow or flow rate control function.

3. The on-line water quality monitor according to claim 1, wherein the microfluidic chip (10) is configured to be stacked longitudinally within the chip storage unit, the transmission module (30) comprises a mechanical arm (31) and a central spindle (32), the mechanical arm (31) is capable of moving the microfluidic chip (10) located uppermost within the chip storage unit onto the central spindle (32) and moving the microfluidic chip (10) on the central spindle (32) out of the central spindle (32), the central spindle (32) is capable of rotating about its own longitudinal axis to allow the optical module (40) to be capable of detecting solutions in the detection cells located at circumferentially different positions of the microfluidic chip (10).

4. The on-line water quality monitor according to claim 1, wherein the microfluidic chip (10) is configured to be longitudinally stacked in the chip storage unit, the transmission module (30) includes a pushing-in unit (33) and a pushing-down unit (34) that is pressed against the microfluidic chip (10) located at the top in the chip storage unit, the pushing-in unit (33) can push the microfluidic chip (10) located at the bottom in the chip storage unit into the detection position, and the pushing-down unit (34) can press the microfluidic chip (10) above into the empty position after the microfluidic chip (10) located at the bottom is pushed out.

5. The on-line water quality monitor according to claim 1, wherein the chip storage unit is configured as a disc (51), a plurality of the microfluidic chips (10) are disposed on the disc (51) at intervals along a circumferential direction of the disc (51), and the transmission module (30) is configured as a rotation mechanism capable of rotating the disc (51) around a longitudinal axis thereof so as to rotate the microfluidic chips (10) to be detected into the detection position and rotate the microfluidic chips (10) after detection out of the detection position.

6. The on-line water quality monitor of claim 1, comprising a pretreatment module for filtering and/or extracting a liquid to be tested, a digestion module for providing temperature, pressure and/or additional reagents to the liquid to be tested, and an automatic dilution module for diluting the liquid to be tested.

7. The on-line water quality monitor according to claim 1, wherein the optical module (40) comprises a light source (42) and an optical detector (43) connected by an optical fiber (41), and the optical detector (43) can receive the light emitted by the light source (42) after passing through the detection cell.

8. The on-line water quality monitor of claim 1, wherein the optical module (40) comprises a collimation module, a monochromator, and a spectroscopic module.

9. The on-line water quality monitor according to claim 1, wherein a plurality of detection cells are formed on the microfluidic chip (10), and the optical module (40) is capable of moving and detecting solutions in different detection cells.

10. An on-line water quality monitoring system, characterized by comprising the on-line water quality monitor according to any one of claims 1 to 9 and a plurality of microfluidic chips (10) stored or carried in the chip storage unit, wherein a flow channel for the through flow of a liquid to be tested and a detection tank communicated with the flow channel are formed on the microfluidic chips (10), and a reagent is preset on the flow channel, and the liquid to be tested can flow into the detection tank after reacting with the reagent in the flow channel.

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