A COD microfluidic detector

Abstract

The present invention provides a COD microfluid detector, comprising: a microfluid chip, provided with a detection area; the material of the microfluid chip is an organic polymer material with good light transmittance in the ultraviolet region; a light source, facing the detection area, for providing detection light to the detection area; a sensor, facing the detection area, for detecting the light signal of the detection area; a circuit board, electrically connected to the light source and the sensor. The COD microfluid detector of the present invention can achieve an ultra-thin design, greatly saving the amount of water sample / standard solution / cleaning solution to be tested.

Description

Technical Field

[0001] The invention relates to the field of water quality analysis, in particular to a COD microfluid detector. Background Art

[0002] Chemical oxygen demand (COD) is a chemical method to measure the amount of reducing substances that need to be oxidized in water samples. The oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in wastewater, effluent from wastewater treatment plants and contaminated water. In the study of river pollution and the properties of industrial wastewater, as well as the operation and management of wastewater treatment plants, it is an important and quickly measured organic pollution parameter. The chemical oxygen demand measured with potassium permanganate solution as the oxidant has been called the permanganate index in my country's water quality environmental standards, and is used to characterize the COD of surface water, drinking water and domestic sewage. This method has relatively accurate measurement results, but the test process is complicated, the operation is cumbersome, the analysis cost is high, and commercial application is difficult. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a COD microfluidic detector that can achieve an ultra-thin design and greatly save the usage of the water sample to be tested / standard solution / cleaning solution.

[0004] To achieve the above-mentioned object and other related objects, the present invention provides a COD microfluidic detector, comprising:

[0005] A microfluidic chip is provided with a detection area; the material of the microfluidic chip is an organic polymer material with good light transmittance in the ultraviolet region;

[0006] a light source, facing the detection area, for providing detection light to the detection area;

[0007] A sensor, facing the detection area, for detecting a light signal in the detection area;

[0008] A circuit board is electrically connected to the light source and the sensor.

[0009] As described above, the present invention has the following beneficial effects:

[0010] The COD microfluidic detector of the present invention can realize an ultra-thin design, which greatly saves the usage of the water sample / standard solution / cleaning solution to be tested;

[0011] The COD microfluidic detector of the present invention has good layout design, good sealing performance, and high accuracy when used for COD detection;

[0012] The microfluidic chip in the COD microfluidic detector of the present invention is processed by mechanical processing or injection molding of one or more organic polymer materials with good ultraviolet transmittance such as cycloolefin copolymer (COC), cycloolefin polymer (COP) and polymethyl methacrylate (PMMA), and further the detection area adopts an ultra-thin design, the detection cavity of the detection area includes a first detection window and a second detection window which are parallel and opposite to each other, the wall thickness H of the first detection window and the second detection window is 0.1-0.5 mm, so as to ensure that the absorption of ultraviolet light by the polymer is minimized;

[0013] The volume of the detection cavity in the COD microfluid detector of the present invention is ≤500 microliters, which greatly saves the injection volume, the usage volume of the standard solution and the usage volume of the cleaning solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of the overall structure of the COD microfluidic detector of the present invention.

[0015] Figure 2 Shown is an exploded view of the COD microfluidic detector of the present invention.

[0016] Figure 3 (a) shows Figure 1 Exploded view of the microfluidic chip in the COD microfluidic detector.

[0017] FIG. 3( b ) is a schematic diagram of the structure of the microfluidic chip in FIG. 3( a ) after the upper chip is flipped.

[0018] FIG. 3( c ) is a schematic diagram of the structure of the microfluidic chip in FIG. 3( a ) after the lower chip is flipped.

[0019] Figure 3(d) is a cross-sectional view of the microfluidic chip.

[0020] Figure 4 (a) shows Figure 1 Schematic diagram of the structure of the first adapter plate in the COD microfluidic detector.

[0021] FIG. 4( b ) is a schematic diagram of the structure of FIG. 4( a ) after the first adapter plate is flipped.

[0022] Figure 5(a) shows Figure 1 Schematic diagram of the structure of the second adapter plate in the COD microfluidic detector.

[0023] FIG5( b ) is a schematic diagram of the structure of FIG5( a ) after the second adapter plate is flipped.

[0024] FIG5( c ) is a schematic structural diagram of a second adapter plate provided with a second adapter plate first unit and a second adapter plate second unit.

[0025] FIG5( d ) is a schematic diagram showing the spacing of the central axis.

[0026] Figure 6 (a) shows Figure 1 Schematic diagram of the structure of the water distribution unit in the COD microfluidic detector.

[0027] FIG6( b ) is a schematic diagram of the structure of the water distribution unit in FIG6( a ) after being flipped.

[0028] FIG6( c ) is a schematic diagram of the front view of the water distribution unit in FIG6( b ).

[0029] FIG6( d ) is a perspective view of the water distribution unit of FIG6( a ).

[0030] FIG6( e ) is a schematic diagram of the top view of the water distribution unit in FIG6( a ).

[0031] Figure 6 (f) is a schematic diagram of the structure of the water distribution unit in Figure 6 (a) after being cut open Figure 1 .

[0032] Figure 6(g) is a schematic diagram of the structure of the water distribution unit in Figure 6(a) after being cut open Figure 2 .

[0033] Figure 6 (h) shows the structure of a water distribution unit with four layers. Figure 1 .

[0034] Figure 6 (i) shows the structure of a water distribution unit with four layers. Figure 2 .

[0035] FIG6(j) is a schematic diagram of the structure of the water distribution unit in FIG6(i) after being cut open.

[0036] Reference numerals

[0037] 1 Microfluidic Chip 11 Detection area 111 Detection chamber 12 Microfluidic Inlet 13 Microfluidic outlet 14 Microfluidic inlet channel 15 Microfluidic outlet channel 16 Microfluidic Through-holes 2 Circuit Board 3 Circuit board bracket 4 Limit fixing parts 41 Limit fixing screw hole 42 First through hole 43 Second through hole 5 Fixed chip rack 51 Screw holes for fixing the chip holder 6 First adapter board 61 The first water inlet channel 62 The first water outlet 63 First adapter plate through hole 64 First screw hole of the first adapter plate 65 Second screw hole of the first adapter plate 66 Fixing slots for light sources and / or sensors 7 Second adapter board 71 Second water inlet channel 72 Second water outlet channel 73 Second adapter plate screw hole 74 Second adapter plate through hole 75 Second adapter board first unit 76 Second adapter board second unit 8 Water distribution unit 81 Inlet main channel 82 Drainage channel 83 Water sample inlet channel 84 Standard liquid inlet channel 85 Cleaning fluid inlet channel 86 First driving fluid inlet channel 87 Second driving fluid inlet channel 88 The third driving fluid flow member inlet channel 89 Water distribution shared flow channel 810 First-level water distribution unit 8101 First layer water distribution unit screw hole 811 Second level water distribution unit 8111 Second layer water distribution unit screw hole 812 The third water distribution unit 813 Fourth floor water distribution unit 9 Drive flow unit 91 Drive fluid components 911 First driving fluid element 912 Second driving fluid element 913 The third driving fluid component 92 Fixings 101 UV light source 102 Visible light source 103 UV sensor 104 Visible light sensor 11a Recessed O-ring limit cavity DETAILED DESCRIPTION

[0038] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0039] See also Figure 1To Figure 6. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0040] like Figure 1 and Figure 2 As shown, a COD microfluid detector comprises: a microfluid chip 1, provided with a detection area 11; the material of the microfluid chip 1 is an organic polymer material with good light transmittance in the ultraviolet region;

[0041] A light source, facing the detection area 11, for providing detection light to the detection area 11;

[0042] A sensor, facing the detection area 11, for detecting the optical signal of the detection area 11;

[0043] The circuit board 2 is electrically connected to the light source and the sensor.

[0044] The material of the microfluidic chip 1 is an organic polymer material with good light transmittance in the ultraviolet region, which can achieve an ultra-thin design and greatly save the amount of water sample / standard solution / cleaning solution to be tested. The circuit board can power and drive the light source and the sensor, and at the same time has an ADC analog-to-digital conversion module, which can convert the read photocurrent analog signal into a digital signal output.

[0045] Good light transmittance in the ultraviolet region means that the ultraviolet light transmittance is ≥40%.

[0046] In a preferred embodiment, as shown in FIG. 3 (a), FIG. 3 (b) and FIG. 3 (c), the microfluidic chip 1 is further provided with a microfluidic water inlet 12, a microfluidic water outlet 13, a microfluidic water inlet channel 14 and a microfluidic water outlet channel 15, the detection area 11 includes a detection chamber 111, and the microfluidic water inlet 12, the microfluidic water inlet channel 14, the detection chamber 111, the microfluidic water outlet channel 15 and the microfluidic water outlet 13 are sequentially connected. The water sample to be tested enters from the microfluidic water inlet 12, flows into the detection chamber 111 through the microfluidic water inlet channel 14, and then is discharged from the microfluidic water outlet 13 through the microfluidic water outlet channel 15.

[0047] In a preferred embodiment, the volume of the detection chamber 111 is ≤ 500 μl, which greatly saves the injection volume, the amount of standard solution used, and the amount of cleaning solution used.

[0048] In a preferred embodiment, as shown in FIG. 3( d ), the detection chamber 111 includes a first detection window and a second detection window that are parallel to each other and opposite to each other, and the wall thickness H of the first detection window and the second detection window is 0.1-0.5 mm.

[0049] In a preferred embodiment, the organic polymer material is selected from one or more of cycloolefin copolymer, cycloolefin polymer and polymethyl methacrylate.

[0050] The microfluidic chip is machined or injection molded using one or more organic polymer materials with good ultraviolet transmittance such as cycloolefin copolymer (COC), cycloolefin polymer (COP) and polymethyl methacrylate (PMMA). Furthermore, the detection area adopts an ultra-thin design. The detection cavity 111 of the detection area includes a first detection window and a second detection window that are parallel to each other. The wall thickness H of the first detection window and the second detection window is 0.1-0.5 mm, ensuring that the absorption of ultraviolet light by the polymer is minimized.

[0051] In a preferred embodiment, the optical path L of the detection area 11 is 1-10 mm. The optical path L refers to the distance between the inner surface of the first detection window and the inner surface of the second detection window.

[0052] In a preferred embodiment, the COD microfluidic detector further includes a circuit board bracket 3 connected to the circuit board 2 for supporting the circuit board 2 .

[0053] In a preferred embodiment, Figure 1 and Figure 2 As shown, it also includes a limiting fixture 4 and a fixed chip frame 5;

[0054] The fixed chip frame 5 is provided with a slot matching the microfluidic chip 1, and the microfluidic chip 1 is arranged in the slot;

[0055] The position-limiting fixture 4 is disposed above the microfluidic chip 1 and is provided with a light-transmitting passage toward the detection area 11 .

[0056] The fixed chip frame 5 provides a slot for the microfluidic chip 1 to fix the position of the microfluidic chip 1 and is also used to fix the limiting fixture 4 .

[0057] In a preferred embodiment, Figure 1 and Figure 2 As shown, the circuit board bracket 3 is arranged between the circuit board 2 and the limiting fixing member 4.

[0058] In a preferred embodiment, as shown in FIG. 4 (a) and FIG. 4 (b), the COD microfluidic detector further includes a first adapter plate 6, and the first adapter plate 6 is disposed below the microfluidic chip 1 and the fixed chip frame 5;

[0059] The first adapter plate 6 is provided with a first water inlet channel 61 and a first water outlet channel 62 ; the first water inlet channel 61 is connected to the microfluidic water inlet 12 , and the first water outlet channel 62 is connected to the microfluidic water outlet 13 .

[0060] In a preferred embodiment, the microfluidic chip 1 is further provided with a microfluidic through hole 16 with an inner thread, and the first adapter plate 6 is further provided with a first adapter plate through hole 63, and the microfluidic through hole 16 is arranged corresponding to the first adapter plate through hole 63; the first adapter plate 6 and the microfluidic chip 1 are fixedly connected by screws through the first adapter plate through hole 63 and the microfluidic through hole 16 in sequence, so that the microfluidic chip 1 fits the first adapter plate 6. The first adapter plate through hole 63 on the first adapter plate is aligned with the microfluidic through hole 16 on the microfluidic chip, wherein the microfluidic through hole 16 is provided with an inner thread (threaded hole), and the screw passes through the first adapter plate through hole 63 and enters the microfluidic through hole 16. Since the microfluidic through hole 16 has threads, tightening the screw will tighten the microfluidic chip toward one side of the first adapter plate, and fasten the microfluidic chip to the first adapter plate, and at the same time, it can play a role in auxiliary positioning, ensure the alignment of the waterway, and improve the sealing of the waterway.

[0061] In a preferred embodiment, as shown in FIG3 (c), the water outlet end of the first water inlet channel 61 and / or the water inlet end of the microfluid water inlet 12 is provided with a recessed O-ring limiting cavity (shown by reference numeral 11a in the figure), and the first water inlet channel 61 and the microfluid water inlet 12 are sealed and connected via an O-ring embedded in the O-ring limiting cavity; the water inlet end of the first water outlet channel 62 and / or the water outlet end of the microfluid water outlet 13 is provided with a recessed O-ring limiting cavity (shown by reference numeral 11a in the figure), and the first water outlet channel 62 and the microfluid water outlet 13 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway.

[0062] In a preferred embodiment, Figure 2As shown, the first adapter plate 6, the fixed chip frame 5 and the position-limiting fixing member 4 are respectively provided with a plurality of first adapter plate first screw holes 64, a plurality of fixed chip frame screw holes 51 and a plurality of position-limiting fixing member screw holes 41. The first adapter plate 6, the fixed chip frame 5 and the position-limiting fixing member 4 are fixedly connected by screws through the first adapter plate first screw holes 64, the fixed chip frame screw holes 51 and the position-limiting fixing member screw holes 41. The first adapter plate first screw holes 64, the fixed chip frame screw holes 51 and the position-limiting fixing member screw holes 41 are used to fix the first adapter plate 6 to the fixed chip frame 5, and the position-limiting fixing member 4 is fixed to the fixed chip frame 5.

[0063] In a preferred embodiment, as shown in FIG. 5 (a) and FIG. 5 (b), the COD microfluidic detector further includes a second adapter plate 7 disposed below the first adapter plate 6;

[0064] The second adapter plate 7 is provided with a second water inlet channel 71 and a second water outlet channel 72. The second water inlet channel 71 is connected to the microfluidic water inlet 12 via the first water inlet channel 61, and the second water outlet channel 72 is connected to the microfluidic water outlet 13 via the first water outlet channel 62. The second water inlet channel 71, the first water inlet channel 61 and the microfluidic water inlet 12 are aligned to achieve water flowing into the microfluidic chip. The second water outlet channel 72, the first water outlet channel 62 and the microfluidic water outlet 13 are aligned to achieve water discharge from the microfluidic chip.

[0065] In a preferred embodiment, as shown in FIG5 (a), the water outlet end of the second water inlet channel 71 and / or the water inlet end of the first water inlet channel 61 is provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a), and the second water inlet channel 71 and the first water inlet channel 61 are sealed and connected via an O-ring embedded in the O-ring limiting cavity; the water inlet end of the second water outlet channel 72 and / or the water outlet end of the first water outlet channel 62 is provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a), and the second water outlet channel 72 and the first water outlet channel 62 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway.

[0066] In a preferred embodiment, the second adapter plate 7 and the first adapter plate 6 are respectively provided with a plurality of second adapter plate screw holes 73 and a plurality of first adapter plate second screw holes 65, and the second adapter plate 7 and the first adapter plate 6 are fixedly connected by screws through the second adapter plate screw holes 73 and the first adapter plate second screw holes 65. The second adapter plate screw holes and the first adapter plate first screw holes are used to fix the second adapter plate to the first adapter plate.

[0067] In a preferred embodiment, the microfluidic chip 1 is further provided with a microfluidic through hole 16 with an internal thread, the first adapter plate 6 is further provided with a first adapter plate through hole 63, and the second adapter plate 7 is further provided with a second adapter plate through hole 74. The microfluidic through hole 16, the first adapter plate through hole 63 and the second adapter plate through hole 74 are arranged correspondingly; the second adapter plate 7, the first adapter plate 6 and the microfluidic chip 1 are fixedly connected by screws through the second adapter plate through hole 74, the first adapter plate through hole 63 and the microfluidic through hole 16 in sequence, so that the microfluidic chip 1, the first adapter plate 6 and the second adapter plate 7 are fitted in sequence. The second adapter plate through hole 74 on the second adapter plate is aligned with the first adapter plate through hole 63 on the first adapter plate and the microfluidic through hole 16 on the microfluidic chip, wherein the microfluidic through hole 16 is provided with a thread (threaded hole), and the screw passes through the second adapter plate through hole 74 and the first adapter plate through hole 63 and enters the microfluidic through hole 16. Since the microfluidic through hole 16 is threaded, tightening the screw will tighten the microfluidic chip toward the side of the first adapter plate, fastening the microfluidic chip to the first adapter plate, and at the same time can play a role in auxiliary positioning, ensuring the alignment of the water path and improving the sealing of the water path.

[0068] In a preferred embodiment, as shown in FIG. 5( c ), the second adapter plate 7 is provided with a second adapter plate first unit 75 and a second adapter plate second unit 76 , and the second water inlet channel 71 and the second water outlet channel 72 pass through the second adapter plate first unit 75 and the second adapter plate second unit 76 ;

[0069] A spacing is provided between the central axes of the second water inlet channel located at the first unit 75 of the second adapter plate and the second water inlet channel located at the second unit 76 of the second adapter plate;

[0070] A spacing is provided between the central axes of the second water outlet channel located at the first unit 75 of the second adapter plate and the second water outlet channel located at the second unit 76 of the second adapter plate. This design is beneficial to improving the stability of the pipeline arranged in the channel.

[0071] In a preferred embodiment, as shown in FIG5(d), the spacing is 0.1 mm to 0.3 mm. As shown in FIG5(d), D is the spacing, for example, the inner diameter of the second water inlet channel located in the first unit 75 of the second adapter plate is the same as the inner diameter of the second water inlet channel located in the second unit 76 of the second adapter plate, and a spacing is set between the central axes of the two, and the spacing is 0.1 mm to 0.3 mm.

[0072] In a preferred embodiment, Figure 1As shown in FIG. 6 (b), the COD microfluidic detector further includes a water distribution unit 8 and a driving liquid flow unit 9, wherein the water distribution unit 8 is provided with a water inlet main flow channel 81 and a drainage flow channel 82; the water inlet main flow channel 81 is connected to the microfluidic water inlet 12 to form a water inlet flow path, or the water inlet main flow channel 81 is connected to the microfluidic water inlet 12 via the first water inlet channel 61 to form a water inlet flow path, or the water inlet main flow channel 81 is connected to the microfluidic water inlet 12 via the second water inlet channel 71 and the first water inlet channel 61 in sequence. It is connected with the microfluidic water inlet 12 to form a water inlet flow path; the microfluidic water outlet 13 is connected with the drainage channel 82 to form a drainage flow path, or the microfluidic water outlet 13 is connected with the drainage channel 82 through the first water outlet channel 62 to form a drainage flow path, or the microfluidic water outlet 13 is connected with the drainage channel 82 through the first water outlet channel 62 and the second water outlet channel 72 in sequence to form a drainage flow path; the driving liquid flow unit 9 is used to drive the liquid flow in the water inlet flow path.

[0073] The water distribution unit 8 has no hard connection with other components in the COD microfluidic detector.

[0074] In a preferred embodiment, as shown in Figures 6(a), 6(b), 6(c), 6(d) and 6(e), the water distribution unit 8 is further provided with a test water sample inlet channel 83, a standard liquid inlet channel 84, a cleaning liquid inlet channel 85, a first driving liquid flow component inlet channel 86, a second driving liquid flow component inlet channel 87, a third driving liquid flow component inlet channel 88 and a water distribution shared channel 89, and the water inlet main channel 81, the first driving liquid flow component inlet channel 86, the second driving liquid flow component inlet channel 87 and the third driving liquid flow component inlet channel 88 are all connected to the water distribution shared channel 89. The water inlet main channel 81, the first driving liquid flow component inlet channel 86, the second driving liquid flow component inlet channel 87 and the third driving liquid flow component inlet channel 88 share a channel, namely the water distribution shared channel 89. The liquid sampled by any driving liquid flow component will flow from one of the first driving liquid flow component inlet channel 86 / the second driving liquid flow component inlet channel 87 / the third driving liquid flow component inlet channel 88 into the water inlet main channel 81 and finally into the microfluidic chip for detection. If the amount of liquid inlet exceeds the volume of the detection chamber of the microfluidic chip, the excess liquid will flow out from the drainage channel 82.

[0075] In a preferred embodiment, the drainage channel 82 , the test water sample inlet channel 83 , the standard liquid inlet channel 84 and the cleaning liquid inlet channel 85 pass through the water distribution unit 8 .

[0076] In a preferred embodiment, the water distribution shared flow channel 89 is disposed in the water distribution unit 8 .

[0077] In a preferred embodiment, the driving liquid flow unit 9 includes a driving liquid flow component 91 and a fixing component 92 , and the fixing component 92 is connected to the driving liquid flow component 91 .

[0078] In a preferred embodiment, the driving liquid flow unit 9 is fixed on the circuit board bracket 3. The fixing member 92 is used to fix the driving liquid flow component 91 on the circuit board bracket 3.

[0079] In a preferred embodiment, the driving liquid flow component 91 is provided with a first driving liquid flow component 911, a second driving liquid flow component 912 and a third driving liquid flow component 913; the test water sample liquid inlet channel 83 is connected with the first driving liquid flow component liquid inlet channel 86 via the first driving liquid flow component 911; the standard liquid liquid inlet channel 84 is connected with the second driving liquid flow component liquid inlet channel 87 via the second driving liquid flow component 912; the cleaning liquid liquid inlet channel 85 is connected with the third driving liquid flow component liquid inlet channel 88 via the third driving liquid flow component 913.

[0080] In a preferred embodiment, the first driving fluid flow component 911, the second driving fluid flow component 912 and the third driving fluid flow component 913 are peristaltic pumps. The peristaltic pump can simultaneously play the role of conveying fluid and locking the waterway, and no additional valve assembly is required.

[0081] In a preferred embodiment, the water distribution unit 8 is provided with a first layer of water distribution units 810, a second layer of water distribution units 811 and a third layer of water distribution units 812 in sequence; the main water inlet channel 81, the first driving liquid flow component inlet channel 86, the second driving liquid flow component inlet channel 87 and the third driving liquid flow component inlet channel 88 run through the first layer of water distribution units 810 and the second layer of water distribution units 811; the drainage channel 82, the test water sample inlet channel 83, the standard liquid inlet channel 84 and the cleaning liquid inlet channel 85 run through the first layer of water distribution units 810, the second layer of water distribution units 811 and the third layer of water distribution units 812.

[0082] In a preferred embodiment, the first layer water distribution unit 810 and the second layer water distribution unit 811 are respectively provided with a plurality of first layer water distribution unit screw holes 8101 and a plurality of second layer water distribution unit screw holes 8111, and the first layer water distribution unit 810 and the second layer water distribution unit 811 are fixedly connected by screws through the first layer water distribution unit screw holes 8101 and the second layer water distribution unit screw holes 8111. This design is used to achieve a tight fit between the first layer water distribution unit 810 and the second layer water distribution unit 811. The second layer water distribution unit 811 and the third layer water distribution unit 812 can be fixed by a glue layer.

[0083] In a preferred embodiment, as shown in FIG. 6 (g), the water inlet end of the main water inlet channel in the first-layer water distribution unit 810 and / or the water outlet end of the main water inlet channel in the second-layer water distribution unit 811 are provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a), and the main water inlet channel in the first-layer water distribution unit 810 and the main water inlet channel in the second-layer water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring, and the pipeline passes through the O-ring. The O-ring can be pressed by a locking screw to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0084] In a preferred embodiment, as shown in FIG. 6 (g), the water outlet of the drainage channel in the first-layer water distribution unit 810 and / or the water inlet of the drainage channel in the second-layer water distribution unit 811 are provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a); the drainage channel in the first-layer water distribution unit 810 and the drainage channel in the second-layer water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by a locking screw to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0085] In a preferred embodiment, as shown in FIG. 6 (g), the water inlet end of the inlet flow channel of the water sample to be tested in the first water distribution unit 810 and / or the water outlet end of the inlet flow channel of the water sample to be tested in the second water distribution unit 811 is provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a); the inlet flow channel of the water sample to be tested in the first water distribution unit 810 and the inlet flow channel of the water sample to be tested in the second water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by a locking screw to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0086] In a preferred embodiment, as shown in FIG6 (g), the water inlet end of the standard liquid inlet flow channel located in the first layer of water distribution unit 810 and / or the water outlet end of the standard liquid inlet flow channel located in the second layer of water distribution unit 811 is provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a); the standard liquid inlet flow channel located in the first layer of water distribution unit 810 and the standard liquid inlet flow channel located in the second layer of water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by a locking screw to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0087] In a preferred embodiment, as shown in FIG. 6 (f), the water inlet end of the cleaning liquid inlet channel in the first water distribution unit 810 and / or the water outlet end of the cleaning liquid inlet channel in the second water distribution unit 811 are provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a); the cleaning liquid inlet channel in the first water distribution unit 810 and the cleaning liquid inlet channel in the second water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by a locking screw to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0088] In a preferred embodiment, as shown in FIG6 (f), the outlet end of the first driving liquid flow component inlet channel in the first layer of water distribution unit 810 and / or the water inlet end of the first driving liquid flow component inlet channel in the second layer of water distribution unit 811 are provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a); the first driving liquid flow component inlet channel in the first layer of water distribution unit 810 and the first driving liquid flow component inlet channel in the second layer of water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by locking screws to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0089] In a preferred embodiment, as shown in FIG6 (f), the outlet end of the second driving liquid flow component inlet channel in the first layer of water distribution unit 810 and / or the water inlet end of the second driving liquid flow component inlet channel in the second layer of water distribution unit 811 are provided with a recessed O-ring limiting cavity (as shown in the figure by reference numeral 11a); the second driving liquid flow component inlet channel in the first layer of water distribution unit 810 and the second driving liquid flow component inlet channel in the second layer of water distribution unit 811 are sealed and connected via an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by locking screws to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0090] In a preferred embodiment, as shown in FIG6 (f), the outlet end of the inlet channel of the third driving liquid flow component in the first layer of water distribution unit 810 and / or the inlet end of the inlet channel of the third driving liquid flow component in the second layer of water distribution unit 811 is provided with a recessed O-ring limiting cavity (as shown in the figure 11a); the inlet channel of the third driving liquid flow component in the first layer of water distribution unit 810 and the inlet channel of the third driving liquid flow component in the second layer of water distribution unit 811 are sealed and connected through an O-ring embedded in the O-ring limiting cavity. This design is conducive to improving the sealing of the waterway. The recessed O-ring limiting cavity is used to install the O-ring. The pipeline passes through the O-ring. The O-ring can be pressed by the locking screw to deform the O-ring, lock the pipeline, avoid water leakage, and improve the sealing of the waterway. The material of the above-mentioned pipeline can be PEEK or PTFE.

[0091] In a preferred embodiment, the drainage channel, the sample inlet channel, the standard liquid inlet channel and the cleaning liquid inlet channel in the third-layer water distribution unit 812 are inverted cone joint screw holes. For example, waste can be discharged through an inverted cone pipe installed in the corresponding inverted cone joint screw hole of the third-layer water distribution unit 812.

[0092] In a preferred embodiment, as shown in FIG. 6 (h), FIG. 6 (i) and FIG. 6 (j), the water distribution unit 8 is further provided with a fourth water distribution unit 813, and the first water distribution unit 810 is provided between the fourth water distribution unit 813 and the second water distribution unit 811;

[0093] The water inlet main channel 81, the first driving liquid flow component inlet channel 86, the second driving liquid flow component inlet channel 87 and the third driving liquid flow component inlet channel 88 penetrate the fourth layer water distribution unit 813, the first layer water distribution unit 810 and the second layer water distribution unit 811; the drainage channel 82, the water sample inlet channel 83, the standard liquid inlet channel 84 and the cleaning liquid inlet channel 85 penetrate the fourth layer water distribution unit 813, the first layer water distribution unit 810, the second layer water distribution unit 811 and the third layer water distribution unit 812;

[0094] A distance is set between the central axis of the main water inlet flow channel located at the fourth-layer water distribution unit 813 and the central axis of the main water inlet flow channel located at the first-layer water distribution unit 810;

[0095] A distance is set between the central axis of the first driving liquid flow member inlet channel located at the fourth layer water distribution unit 813 and the central axis of the first driving liquid flow member inlet channel located at the first layer water distribution unit 810;

[0096] A distance is set between the central axis of the second driving liquid flow member inlet channel located at the fourth layer water distribution unit 813 and the central axis of the second driving liquid flow member inlet channel located at the first layer water distribution unit 810;

[0097] A spacing is provided between the central axis of the third driving liquid flow component inlet channel located in the fourth layer water distribution unit 813 and the central axis of the third driving liquid flow component inlet channel located in the first layer water distribution unit 810;

[0098] A distance is set between the central axis of the drainage channel located at the fourth-layer water distribution unit 813 and the central axis of the drainage channel located at the first-layer water distribution unit 810;

[0099] A spacing is provided between the central axis of the inlet flow channel of the water sample to be tested located at the fourth-layer water distribution unit 813 and the central axis of the inlet flow channel of the water sample to be tested located at the first-layer water distribution unit 810;

[0100] A spacing is provided between the central axis of the standard liquid inlet flow channel located at the fourth-layer water distribution unit 813 and the central axis of the standard liquid inlet flow channel located at the first-layer water distribution unit 810;

[0101] A spacing is provided between the central axis of the cleaning liquid inlet flow channel located in the fourth layer water distribution unit 813 and the central axis of the cleaning liquid inlet flow channel located in the first layer water distribution unit 810. This design is conducive to improving the stability of the pipeline arranged in the flow channel.

[0102] In a preferred embodiment, the spacing is 0.1 mm to 0.3 mm. As shown in FIG5 (d), D is the spacing, for example: the water inlet main flow channel located at the fourth layer water distribution unit 813 has the same inner diameter as the water inlet main flow channel located at the first layer water distribution unit 810, and a spacing is set between the central axes of the two, and the spacing is 0.1 mm to 0.3 mm.

[0103] Taking the flow of the water sample to be tested as an example, the water sample to be tested passes through the liquid inlet channel 83 of the water distribution unit 8, the first driving liquid flow component 911 of the driving liquid flow unit 9, the liquid inlet channel 86 of the first driving liquid flow component of the water distribution unit 8, the total water inlet channel 81 of the water distribution unit 8, the second water inlet channel 71 of the second adapter plate 7, the first water inlet channel 61 of the first adapter plate 6, the microfluidic water inlet 12 of the microfluidic chip 1, the microfluidic water inlet channel 14 of the microfluidic chip 1, the detection cavity 111 of the microfluidic chip 1, the microfluidic water outlet channel 15 of the microfluidic chip 1, the microfluidic water outlet 13 of the microfluidic chip 1, the first water outlet channel 62 of the first adapter plate 6, the second water outlet channel 72 of the second adapter plate 7 and the drainage channel 82 of the water distribution unit 8 in sequence, thereby completing the transportation and detection of the water sample to be tested.

[0104] In a preferred embodiment, the light source includes an ultraviolet light source 101 and a visible light source 102, and the sensor includes an ultraviolet light sensor 103 and a visible light sensor 104. The visible light emitted by the visible light source 102 is used to observe the cleanliness of the detection area and to indicate whether it is necessary to clean or replace the microfluidic chip 1. The ultraviolet light source 101, such as an ultraviolet lamp, is used to detect COD in the sample.

[0105] In a preferred embodiment, the number of ultraviolet light sources 101 is 2.

[0106] In a preferred embodiment, the wavelength of the ultraviolet light source is 254-300 nm, and the wavelength of the visible light source is 510-530 nm.

[0107] In a preferred embodiment, the light source and / or the sensor is arranged on the first adapter plate 6 .

[0108] In a preferred embodiment, a fixing groove 66 for fixing the light source and / or the sensor is provided on the first adapter plate 6 .

[0109] In a preferred embodiment, the light source and / or the sensor are arranged on the circuit board 2 .

[0110] For example, the circuit board 2 is provided with a visible light source 102 and an ultraviolet light sensor 103, and the first adapter board 6 is provided with a visible light sensor 104 and an ultraviolet light source 101. The visible light source 102 is provided correspondingly to the visible light sensor 104, and the ultraviolet light sensor 103 is provided correspondingly to the ultraviolet light source 101.

[0111] In a preferred embodiment, the light-transmitting passage is formed by a first through hole 42 and a second through hole 43 provided on the position-limiting fixing member 4 .

[0112] Example

[0113] The COD microfluidic detector of the present invention is used for detection, wherein the material of the microfluidic chip 1 is cycloolefin copolymer, the microfluidic chip 1 is provided with a detection area 11, the detection area 11 includes a detection cavity 111, the detection cavity 111 includes a first detection window and a second detection window which are parallel to each other, the wall thickness H of the first detection window and the second detection window is 0.2 mm, the optical path of the detection area 11 is 5.6 mm, the volume of the detection cavity 111 is 500 microliters, the wavelengths of the two ultraviolet lamps are 265 nm and 275 nm respectively, and the wavelength of the visible light source is 520 nm.

[0114] Operation process: During the initial operation, COD standard liquids of different concentrations may be sequentially introduced from the standard liquid inlet channel 84 and read using a light source.

[0115] Standard solution concentration UV dark current UV1 UV2 Visible light dark current Visible light signal Signal calculation value Fitting slope Fitting intercept Correlation coefficient 0 0.002942 0.087636 0.124238 0.006299 0.088333 -0.6861539 -402.7909 -277.28466 0.99934492 25 0.003251 0.076342 0.107469 0.006286 0.088531 -0.7512692 50 0.0034 0.066377 0.093166 0.00628 0.088876 -0.8160387 100 0.003689 0.051215 0.072404 0.006275 0.088641 -0.9346407

[0116] Taking the table as an example, using four different concentrations of standard solutions, the UV dark current is the background value read by the UV sensor when the UV lamp is not turned on. Similarly, the visible light dark current refers to the signal value of the visible light read by the visible light sensor when the 520nm visible light LED is not turned on. These values ​​need to be subtracted in the actual calculation. Since the detection window is very clean and has not been contaminated, the visible light signal has basically not changed. The signal calculation value refers to the signal processing of the reading using the UV lamp, = log10 (uv1+uv2-2*uv dark current).

[0117] The concentration of the standard solution and the calculated signal value were linearly fitted using the built-in fitting tool of Excel, and the slope and intercept of the fitting curve were obtained using the SLOPE and INTERCEPT tools.

[0118] At the same time, the correlation coefficient between the fitted curve and the actual value can also be calculated. Here, the correlation coefficient = 0.999, which is very good.

[0119] Then the linear curve formula is: Y=ax+b;

[0120] Among them, a=-402.79; b=-277.285.

[0121] That is, Y=-402.79x-277.285;

[0122] Where Y is the COD concentration of the sample and x is the calculated value of the signal.

[0123] In actual use, this formula is used to calculate the COD concentration value in an unknown sample. The COD concentration of a river water detected by the COD microfluidic detector and the above method is shown in the table below, and the COD concentration measured by potassium dichromate digestion method is shown in the table below. It can be seen that the COD microfluidic detector has high accuracy when used for COD detection.

[0124] 1 2 3 4 5 6 The COD microfluidic detector 24.5ppm 125.5ppm 82.5ppm 5.2ppm 10.6ppm 52.3ppm Potassium dichromate digestion method 25ppm 125.2 ppm 81.9ppm 5.1ppm 10.7ppm 52.1ppm

[0125] In addition, it can be assumed that the slope value does not change during long-term use, and only the intercept will change to a certain extent. Therefore, after the first use, there is no need to use multiple concentrations for calibration in actual operation. It is only necessary to use a sample of a given concentration to calibrate the b value.

[0126] The cleaning liquid can be sodium hypochlorite with a mass ratio between 1 / 100 and 1 / 1000, and the flow channel can be cleaned once in a while.

[0127] In addition, after reading or cleaning is completed during operation, the peristaltic pump can be reversed to backwash the system, and the sample or cleaning liquid remaining in the flow channel can be completely discharged through the main water inlet flow channel 81.

[0128] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A COD microfluidic detector, characterized in that: It comprises a microfluidic chip (1), wherein the microfluidic chip (1) is provided with a detection area (11); the material of the microfluidic chip (1) is an organic polymer material with good light transmittance in the ultraviolet region; a light source, facing the detection area (11), and used to provide detection light to the detection area (11); A sensor facing the detection area (11) and used to detect the light signal of the detection area (11); A circuit board (2) electrically connected to the light source and the sensor; The COD microfluid detector further comprises a water distribution unit (8) and a driving liquid flow unit (9); the water distribution unit (8) is provided with a water inlet main flow channel (81) and a water discharge flow channel (82); the water inlet main flow channel (81) is connected to the microfluid water inlet (12) to form a water inlet flow path; or the water inlet main flow channel (81) is connected to the microfluid water inlet (12) via a first water inlet channel (61) to form a water inlet flow path; or the water inlet main flow channel (81) is connected to the microfluid water inlet (12) via a second water inlet channel (71) and the first water inlet channel (61) in sequence. The fluid water inlet (12) is connected to form a water inlet flow path; the microfluid water outlet (13) is connected to the drainage flow channel (82) to form a drainage flow path, or the microfluid water outlet (13) is connected to the drainage flow channel (82) via the first water outlet channel (62) to form a drainage flow path, or the microfluid water outlet (13) is connected to the drainage flow channel (82) via the first water outlet channel (62) and the second water outlet channel (72) in sequence to form a drainage flow path; the driving liquid flow unit (9) is used to drive the liquid flow in the water inlet flow path; The water distribution unit (8) is provided with a first layer of water distribution units (810), a second layer of water distribution units (811) and a third layer of water distribution units (812) in sequence; the water inlet main flow channel (81), the first driving liquid flow component inlet flow channel (86), the second driving liquid flow component inlet flow channel (87) and the third driving liquid flow component inlet flow channel (88) run through the first layer of water distribution units (810) and the second layer of water distribution units (811); the drainage flow channel (82), the water sample inlet flow channel (83), the standard liquid inlet flow channel (84) and the cleaning liquid inlet flow channel (85) run through the first layer of water distribution units (810), the second layer of water distribution units (811) and the third layer of water distribution units (812).

2. The COD microfluidic detector according to claim 1, characterized in that: The microfluidic chip (1) is further provided with a microfluidic water inlet (12), a microfluidic water outlet (13), a microfluidic water inlet flow channel (14) and a microfluidic water outlet flow channel (15); the detection area (11) comprises a detection chamber (111); the microfluidic water inlet (12), the microfluidic water inlet flow channel (14), the detection chamber (111), the microfluidic water outlet flow channel (15) and the microfluidic water outlet (13) are sequentially connected.

3. The COD microfluidic detector according to claim 1, characterized in that: The COD microfluidic detector further comprises a circuit board bracket (3) connected to the circuit board (2) and used for supporting the circuit board (2).

4. The COD microfluidic detector according to claim 3, characterized in that: It also includes a limiting fixture (4) and a fixed chip rack (5); the fixed chip rack (5) is provided with a slot matching the microfluidic chip (1), and the microfluidic chip (1) is arranged in the slot; the limiting fixture (4) is arranged above the microfluidic chip (1) and is provided with a light-transmitting passage toward the detection area (11).

5. The COD microfluidic detector according to claim 4, characterized in that: The circuit board bracket (3) is arranged between the circuit board (2) and the position-limiting fixing member (4).

6. The COD microfluidic detector according to claim 4, characterized in that: The COD microfluid detector further comprises a first adapter plate (6), the first adapter plate (6) being arranged below the microfluidic chip (1) and the fixed chip frame (5); a first water inlet channel (61) and a first water outlet channel (62) are arranged on the first adapter plate (6); the first water inlet channel (61) is connected to the microfluidic water inlet (12), and the first water outlet channel (62) is connected to the microfluidic water outlet (13).

7. The COD microfluidic detector according to claim 6, characterized in that: The microfluidic chip (1) is further provided with a microfluidic through hole (16) with an internal thread, and the first adapter plate (6) is further provided with a first adapter plate through hole (63), and the microfluidic through hole (16) is arranged corresponding to the first adapter plate through hole (63); the first adapter plate (6) and the microfluidic chip (1) are fixedly connected by screws through the first adapter plate through hole (63) and the microfluidic through hole (16) in sequence, so that the microfluidic chip (1) is fitted with the first adapter plate (6).

8. The COD microfluidic detector according to claim 6, characterized in that: The water outlet end of the first water inlet channel (61) and / or the water inlet end of the microfluid water inlet (12) is provided with a recessed O-ring limiting cavity, and the first water inlet channel (61) and the microfluid water inlet (12) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; the water inlet end of the first water outlet channel (62) and / or the water outlet end of the microfluid water outlet (13) is provided with a recessed O-ring limiting cavity, and the first water outlet channel (62) and the microfluid water outlet (13) are sealed and connected via an O-ring embedded in the O-ring limiting cavity.

9. The COD microfluidic detector according to claim 6, characterized in that: The first adapter plate (6), the fixed chip frame (5) and the limiting fixing member (4) are respectively provided with a plurality of first adapter plate first screw holes (64), a plurality of fixed chip frame screw holes (51) and a plurality of limiting fixing member screw holes (41); the first adapter plate (6), the fixed chip frame (5) and the limiting fixing member (4) are fixedly connected by screws through the first adapter plate first screw holes (64), the fixed chip frame screw holes (51) and the limiting fixing member screw holes (41).

10. The COD microfluidic detector according to claim 6, characterized in that: The COD microfluid detector further comprises a second adapter plate (7) disposed below the first adapter plate (6); a second water inlet channel (71) and a second water outlet channel (72) are disposed on the second adapter plate (7); the second water inlet channel (71) is connected to the microfluid water inlet (12) via the first water inlet channel (61), and the second water outlet channel (72) is connected to the microfluid water outlet (13) via the first water outlet channel (62).

11. The COD microfluidic detector according to claim 10, characterized in that: The water outlet end of the second water inlet channel (71) and / or the water inlet end of the first water inlet channel (61) is provided with a recessed O-ring limiting cavity, and the second water inlet channel (71) and the first water inlet channel (61) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; the water inlet end of the second water outlet channel (72) and / or the water outlet end of the first water outlet channel (62) is provided with a recessed O-ring limiting cavity, and the second water outlet channel (72) and the first water outlet channel (62) are sealed and connected via an O-ring embedded in the O-ring limiting cavity.

12. The COD microfluidic detector according to claim 10, characterized in that: The second adapter plate (7) and the first adapter plate (6) are respectively provided with a plurality of second adapter plate screw holes (73) and a plurality of first adapter plate second screw holes (65), and the second adapter plate (7) and the first adapter plate (6) are fixedly connected by screws through the second adapter plate screw holes (73) and the first adapter plate second screw holes (65).

13. The COD microfluidic detector according to claim 10, characterized in that: The microfluidic chip (1) is also provided with a microfluidic through hole (16) with an internal thread, the first adapter plate (6) is also provided with a first adapter plate through hole (63), and the second adapter plate (7) is also provided with a second adapter plate through hole (74). The microfluidic through hole (16), the first adapter plate through hole (63) and the second adapter plate through hole (74) are arranged correspondingly; the second adapter plate (7), the first adapter plate (6) and the microfluidic chip (1) are fixedly connected by screws through the second adapter plate through hole (74), the first adapter plate through hole (63) and the microfluidic through hole (16) in sequence, so that the microfluidic chip (1), the first adapter plate (6) and the second adapter plate (7) are sequentially attached.

14. The COD microfluidic detector according to claim 10, characterized in that: The second adapter plate (7) is provided with a second adapter plate first unit (75) and a second adapter plate second unit (76); the second water inlet channel (71) and the second water outlet channel (72) penetrate the second adapter plate first unit (75) and the second adapter plate second unit (76); a spacing is provided between the central axes of the second water inlet channel located at the second adapter plate first unit (75) and the second water inlet channel located at the second adapter plate second unit (76); a spacing is provided between the central axes of the second water outlet channel located at the second adapter plate first unit (75) and the second water outlet channel located at the second adapter plate second unit (76).

15. The COD microfluidic detector according to any one of claims 1 to 8, characterized in that: The light source comprises an ultraviolet light source (101) and a visible light source (102), and the sensor comprises an ultraviolet light sensor (103) and a visible light sensor (104).

16. The COD microfluidic detector according to claim 1, characterized in that: The water distribution unit (8) is further provided with a test water sample inlet flow channel (83), a standard liquid inlet flow channel (84), a cleaning liquid inlet flow channel (85), a first drive liquid flow component inlet flow channel (86), a second drive liquid flow component inlet flow channel (87), a third drive liquid flow component inlet flow channel (88) and a water distribution shared flow channel (89); the water inlet main flow channel (81), the first drive liquid flow component inlet flow channel (86), the second drive liquid flow component inlet flow channel (87) and the third drive liquid flow component inlet flow channel (88) are all in communication with the water distribution shared flow channel (89).

17. The COD microfluidic detector according to claim 3, characterized in that: The driving liquid flow unit (9) comprises a driving liquid flow component (91) and a fixing component (92), wherein the fixing component (92) is connected to the driving liquid flow component (91).

18. The COD microfluidic detector according to claim 15, characterized in that: The light source and / or sensor is arranged on the first adapter plate (6); or, the light source and / or sensor is arranged on the circuit board (2); the light transmission passage is formed by a first through hole (42) and a second through hole (43) arranged on the position-limiting fixing member (4).

19. The COD microfluidic detector according to claim 1, characterized in that: The drainage channel (82), the test water sample inlet channel (83), the standard liquid inlet channel (84) and the cleaning liquid inlet channel (85) are connected to the water distribution unit (8); and / or the water distribution shared channel (89) is arranged in the water distribution unit (8).

20. The COD microfluidic detector according to claim 17, characterized in that: The driving liquid flow unit (9) is fixed on the circuit board bracket (3); and / or the driving liquid flow component (91) is provided with a first driving liquid flow component (911), a second driving liquid flow component (912) and a third driving liquid flow component (913); the test water sample inlet flow channel (83) is connected to the first driving liquid flow component inlet flow channel (86) via the first driving liquid flow component (911); the standard liquid inlet flow channel (84) is connected to the second driving liquid flow component inlet flow channel (87) via the second driving liquid flow component (912); and the cleaning liquid inlet flow channel (85) is connected to the third driving liquid flow component inlet flow channel (88) via the third driving liquid flow component (913).

21. The COD microfluidic detector according to claim 1, characterized in that: A water inlet end of the main water inlet flow channel located in the first-layer water distribution unit (810) and / or a water outlet end of the main water inlet flow channel located in the second-layer water distribution unit (811) is provided with a recessed O-ring limiting cavity, and the main water inlet flow channel located in the first-layer water distribution unit (810) and the main water inlet flow channel located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; And / or, the water outlet end of the drainage channel located in the first-layer water distribution unit (810) and / or the water inlet end of the drainage channel located in the second-layer water distribution unit (811) are provided with a recessed O-ring limiting cavity; the drainage channel located in the first-layer water distribution unit (810) and the drainage channel located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; And / or, the water inlet end of the inlet flow channel of the water sample to be tested located in the first-layer water distribution unit (810) and / or the water outlet end of the inlet flow channel of the water sample to be tested located in the second-layer water distribution unit (811) are provided with a recessed O-ring limiting cavity; the inlet flow channel of the water sample to be tested located in the first-layer water distribution unit (810) and the inlet flow channel of the water sample to be tested located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; And / or, a water inlet end of the standard liquid inlet flow channel located in the first-layer water distribution unit (810) and / or a water outlet end of the standard liquid inlet flow channel located in the second-layer water distribution unit (811) is provided with a recessed O-ring limiting cavity; the standard liquid inlet flow channel located in the first-layer water distribution unit (810) and the standard liquid inlet flow channel located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; And / or, a water inlet end of the cleaning liquid inlet flow channel located in the first-layer water distribution unit (810) and / or a water outlet end of the cleaning liquid inlet flow channel located in the second-layer water distribution unit (811) is provided with a recessed O-ring limiting cavity; the cleaning liquid inlet flow channel located in the first-layer water distribution unit (810) and the cleaning liquid inlet flow channel located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; and / or, a water outlet end of the first driving liquid flow component inlet flow channel in the first-layer water distribution unit (810) and / or a water inlet end of the first driving liquid flow component inlet flow channel in the second-layer water distribution unit (811) is provided with a recessed O-ring limiting cavity; the first driving liquid flow component inlet flow channel in the first-layer water distribution unit (810) and the first driving liquid flow component inlet flow channel in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; And / or, a water outlet end of the liquid inlet flow channel of the second driving liquid flow component located in the first-layer water distribution unit (810) and / or a water inlet end of the liquid inlet flow channel of the second driving liquid flow component located in the second-layer water distribution unit (811) is provided with a recessed O-ring limiting cavity; the liquid inlet flow channel of the second driving liquid flow component located in the first-layer water distribution unit (810) and the liquid inlet flow channel of the second driving liquid flow component located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity; And / or, the water outlet end of the liquid inlet channel of the third driving liquid flow component located in the first-layer water distribution unit (810) and / or the water inlet end of the liquid inlet channel of the third driving liquid flow component located in the second-layer water distribution unit (811) are provided with a recessed O-ring limiting cavity; the liquid inlet channel of the third driving liquid flow component located in the first-layer water distribution unit (810) and the liquid inlet channel of the third driving liquid flow component located in the second-layer water distribution unit (811) are sealed and connected via an O-ring embedded in the O-ring limiting cavity.

22. The COD microfluidic detector according to claim 1, characterized in that: The water distribution unit (8) is further provided with a fourth-layer water distribution unit (813), and the first-layer water distribution unit (810) is provided between the fourth-layer water distribution unit (813) and the second-layer water distribution unit (811); The water inlet main flow channel (81), the first driving liquid flow component inlet flow channel (86), the second driving liquid flow component inlet flow channel (87) and the third driving liquid flow component inlet flow channel (88) are connected to the fourth layer water distribution unit (813), the first layer water distribution unit (810) and the second layer water distribution unit (811); the drainage flow channel (82), the test water sample inlet flow channel (83), the standard liquid inlet flow channel (84) and the cleaning liquid inlet flow channel (85) are connected to the fourth layer water distribution unit (813), the first layer water distribution unit (810), the second layer water distribution unit (811) and the third layer water distribution unit (812); A spacing is provided between the central axes of the main water inlet flow channel located at the fourth-layer water distribution unit (813) and the main water inlet flow channel located at the first-layer water distribution unit (810); A spacing is provided between the central axis of the first driving liquid flow component liquid inlet channel located in the fourth layer water distribution unit (813) and the central axis of the first driving liquid flow component liquid inlet channel located in the first layer water distribution unit (810); A spacing is provided between the central axis of the second driving liquid flow member liquid inlet channel located in the fourth layer water distribution unit (813) and the central axis of the second driving liquid flow member liquid inlet channel located in the first layer water distribution unit (810); A spacing is provided between the central axes of the liquid inlet flow channel of the third driving liquid flow component located in the fourth-layer water distribution unit (813) and the liquid inlet flow channel of the third driving liquid flow component located in the first-layer water distribution unit (810); A distance is provided between the central axis of the drainage flow channel located at the fourth-layer water distribution unit (813) and the central axis of the drainage flow channel located at the first-layer water distribution unit (810); A spacing is provided between the central axis of the inlet flow channel of the water sample to be tested located in the fourth-layer water distribution unit (813) and the central axis of the inlet flow channel of the water sample to be tested located in the first-layer water distribution unit (810); A spacing is provided between the central axis of the standard liquid inlet flow channel located at the fourth-layer water distribution unit (813) and the central axis of the standard liquid inlet flow channel located at the first-layer water distribution unit (810); A spacing is provided between the central axes of the cleaning liquid inlet flow channel located in the fourth-layer water distribution unit (813) and the cleaning liquid inlet flow channel located in the first-layer water distribution unit (810).

23. The COD microfluidic detector according to claim 22, characterized in that: The spacing is 0.1mm~0.3mm.

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