Device and method for detecting total organic carbon by ultraviolet coupling ultrasonic-persulfate method

Abstract

The invention discloses a device and a method for detecting total organic carbon by an ultraviolet coupling ultrasonic-persulfate method. The method comprises the following steps: firstly, fully mixing a to-be-detected sample with a persulfate activator, then transferring the mixed solution into a phosphoric acid solution to remove inorganic carbon in the to-be-detected sample, and then enabling the mixed solution without the inorganic carbon to enter an ultrasonic-ultraviolet microreactor; then, persulfate is activated by utilizing ultrasonic and ultraviolet energy to generate active oxygen species to convert organic matters into CO2, the generated CO2 is captured by a CO2 catcher and is transmitted to a non-dispersive infrared detector, and finally, the data of the generated CO2 is converted into the concentration of TOC in a solution by a data processor. The device is low in manufacturing cost, the detection method is wide in application range, the sample can be quickly decomposed, the anti-interference performance is high, the TOC determination effect on the high-salt organic wastewater is remarkable, and the TOC detection sensitivity can reach 0.1 microgram / L.

Description

Technical Field

[0001] The present invention belongs to the field of total organic carbon detection devices, and relates to a device and method for detecting total organic carbon by ultraviolet coupling ultrasonic - persulfate method. Background Art

[0002] Total Organic Carbon (TOC) is the sum of the concentrations of all organic carbon atoms in a water sample, and is also an important indicator for characterizing the degree of organic pollution in water bodies, usually in units of mg / L (ppm) or μg / L (ppb). TOC can accurately and directly represent the total amount of organic matter, but cannot reflect the types and compositions of organic substances contained in water.

[0003] The measurement of TOC has long been an indispensable item in the field of environmental detection, and is widely used in aspects such as pollution sources, seawater, industrial wastewater, the pharmaceutical industry, the electronic manufacturing industry, etc. The basic principle of TOC measurement is to first oxidize the carbon in the organic matter in water into carbon dioxide, eliminate interference factors, then measure it by a carbon dioxide detector, and then convert the carbon dioxide gas content into the concentration of organic matter in water through data processing. Currently, the measurement methods of TOC mainly include nine methods such as wet oxidation (persulfate) - non - dispersive infrared detection, high - temperature catalytic combustion oxidation - non - dispersive infrared detection, ultraviolet oxidation - non - dispersive infrared detection, ultraviolet (UV) - wet (persulfate) oxidation, resistance method, ultraviolet method, conductivity method, ozone oxidation method, and ultrasonic cavitation sonoluminescence method. Through continuous research and experiments, the TOC detection method has gradually changed from traditional complex technology to convenient and accurate. Among them, the new method based on persulfate oxidation has gradually been widely recognized. This method is to pretreat the sample to be measured with phosphoric acid before oxidation to remove inorganic carbon, and then oxidize the organic matter in water into CO 2 ₂, and then use the non - dispersive infrared method or the conductivity method to measure the total amount of CO 2 ₂ gas in the system, so as to determine the TOC concentration in the sample. In modern TOC continuous analyzers, the vast majority are wet oxidation. Wet oxidation is applicable to conventional water bodies such as surface water and conventional seawater, but not applicable to complex water bodies with high TOC content (such as humic acid, high - molecular - weight compounds, etc.). The fundamental reason is that the oxidation of organic matter is not sufficient. Therefore, developing a device with high sensitivity, fast detection efficiency, wide application range, and low detection cost has always been the core issue in the development of TOC instruments. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for detecting total organic carbon by ultraviolet coupling ultrasonic - persulfate method.

[0005] The technical solutions for achieving the purpose of the present invention are as follows:

[0006] Device for detecting total organic carbon by ultraviolet coupling ultrasonic - persulfate method, comprising a light - proof and sound - insulating box encapsulation housing 14. One end of the light - proof and sound - insulating box encapsulation housing 14 is provided with a first sample inlet 15, a second sample inlet 16 and a third sample inlet 17, and one end is provided with a nitrogen inlet 11, a liquid outlet 12 and an ultrasonic coupling agent injection / discharge port 13. Inside the light - proof and sound - insulating box encapsulation housing 14, there are a persulfate solution reaction tank 1, a phosphoric acid solution reaction tank 2, an ultrasonic controller 3, an ultraviolet controller 4, CO 2 trap 5, a non - dispersive infrared detector 6, an ultrasonic - ultraviolet micro - reactor 7, a first micro peristaltic pump 8, a second micro peristaltic pump 9, and a data processor 10; The first sample inlet 15 is connected to the persulfate solution reaction tank 1 with the second sample inlet 16. The persulfate solution reaction tank 1 is connected to the phosphoric acid solution reaction tank 2 through the first micro peristaltic pump 8. The third sample inlet 17 is connected to the phosphoric acid solution reaction tank 2. The phosphoric acid solution reaction tank 2 is connected to the ultrasonic - ultraviolet micro - reactor 7 through the second micro peristaltic pump 9. The nitrogen inlet 11, the liquid outlet 12, and the ultrasonic coupling agent injection / discharge port 13 are respectively connected to the ultrasonic - ultraviolet micro - reactor 7. The ultrasonic - ultraviolet micro - reactor 7 is respectively connected to the ultrasonic controller 3, the ultraviolet controller 4 and CO 2 trap 5, CO 2 trap 5 is connected to the non - dispersive infrared detector 6, and the non - dispersive infrared detector 6 is connected to the data processor 10.

[0007] Furthermore, the ultrasonic - ultraviolet micro - reactor 7 includes an ultraviolet micro - reactor 71, an ultrasonic micro - reactor 72 and a connecting plate 73; The ultraviolet micro - reactor 71 is fixedly connected to the ultrasonic micro - reactor 72 through the connecting plate 73. The connecting plate 73 is a detachable fastener, which has a hole with a diameter equivalent to that of the ultraviolet micro - reactor 71 in the middle and is connected to the ultraviolet micro - reactor 71 and the ultrasonic micro - reactor 72 respectively through buckles.

[0008] Furthermore, the ultraviolet micro - reactor 71 includes a nitrogen inlet pipe 711, a sample inlet pipe 712, an ultraviolet light source 713, an outlet pipe 714, a waste liquid discharge pipe 715, a first check valve 716, and an ultraviolet reaction cell 717; The nitrogen inlet pipe 711 is fixed above the ultraviolet micro - reactor 71 and is connected to the nitrogen inlet 11. The sample inlet pipe 712 is fixed on one side of the ultraviolet micro - reactor 71 and is connected to the second micro peristaltic pump 9. The ultraviolet light source 713 is a detachable fastener, which is fixed in the ultraviolet micro - reactor 71 through threads and is connected to the ultraviolet controller 4 through wires. The outlet pipe 714 is fixed above the ultraviolet micro - reactor 71 and is connected to CO 2 trap 5. The waste liquid discharge pipe 715 is provided with a first check valve 716, and both ends of the waste liquid discharge pipe 715 are respectively connected to the liquid outlet 12 and the ultraviolet reaction cell 717.

[0009] Further, the ultrasonic micro-reactor 72 includes a waterproof steel plate 721, an ultrasonic reaction tank 722, an ultrasonic transducer 723, a second check valve 724, and an ultrasonic coupling agent injection / discharge pipe 725; the ultrasonic transducer 723 is fixed to the bottom of the ultrasonic micro-reactor 72 and connected to the ultrasonic controller 3 through a wire, the waterproof steel plate 721 is located above the ultrasonic transducer 723, the ultrasonic reaction tank 722 is located above the waterproof steel plate 721 and connected to the ultrasonic coupling agent injection / discharge pipe 725, and the ultrasonic coupling agent injection / discharge pipe 725 is provided with a second check valve 724 and connected to the ultrasonic coupling agent injection / discharge port 13.

[0010] Further, a magnetic stirrer is provided inside the persulfate solution reaction tank 1, and a magnetic stirrer is provided inside the phosphoric acid solution reaction tank 2.

[0011] A method for detecting total organic carbon by ultraviolet coupled ultrasonic-persulfate method using the above device includes the following steps:

[0012] S1: The sample to be tested and the persulfate solution enter the persulfate solution reaction tank 1 through the first sample inlet 15 and the second sample inlet 16 respectively for mixing, and then are pumped into the phosphoric acid solution reaction tank 2 by the first micro peristaltic pump 8 for inorganic carbon removal, and the system pH is adjusted. Finally, the solution is pumped into the ultrasonic-ultraviolet micro-reactor 7 by the second micro peristaltic pump 9;

[0013] S2: The ultrasonic coupling agent enters the ultrasonic-ultraviolet micro-reactor 7 through the ultrasonic coupling agent injection / discharge port 13. The ultrasonic controller 3 and the ultraviolet controller 4 are turned on to simultaneously perform ultraviolet persulfate activation and ultrasonic persulfate activation on the solution in the ultrasonic-ultraviolet micro-reactor 7, so that the organic matter in the sample is quickly and completely mineralized and degraded into CO 2 ;

[0014] S3: Nitrogen enters the ultrasonic-ultraviolet micro-reactor 7 from the nitrogen inlet 11, and the generated CO 2 gas is subjected to purge treatment, collected by the CO 2 trap 5, and the waste liquid after the reaction is discharged from the liquid outlet 12; 2 S4: The mixture of the trapped CO

[0015] and N 2 is transported to the non-dispersive infrared detector 6 to obtain the sample signal; 2 S5: The signal is processed by the data processor 10 to achieve the quantification of CO

[0016] and output the TOC value. 2 Compared with the prior art, the present invention has the following beneficial effects:

[0017]

[0018] ​(1) The TOC detection device of the present invention couples ultraviolet and ultrasonic reactors, effectively improving the activation efficiency of persulfate and the catalytic reaction rate during the reaction process, and achieving rapid degradation of organic substances.

[0019] (2) The TOC detection device of the present invention can accurately and rapidly measure the TOC content in the sample to be tested, and its TOC detection sensitivity can reach 0.1 μg / L.

[0020] (3) There is no secondary pollution during the detection process of the present invention, and the manufacturing cost of the device is low, effectively solving the problems of complex structure and high price of imported products. Description of the Drawings

[0021] The drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0022] Figure 1 It is a schematic diagram of the overall structure of the device for detecting total organic carbon by the ultraviolet-coupled ultrasonic-persulfate method;

[0023] Figure 2 It is a schematic diagram of the structure of the ultrasonic-ultraviolet microreactor;

[0024] Figure 3 It is a schematic diagram of the structure of the ultraviolet microreactor;

[0025] Figure 4 It is a schematic diagram of the structure of the ultrasonic microreactor;

[0026] In the figure: 1. Persulfate solution reaction tank, 2. Phosphoric acid solution reaction tank, 3. Ultrasonic controller, 4. Ultraviolet controller, 5. CO 2 Trap, 6. Nondispersive infrared detector, 7. Ultrasonic-ultraviolet microreactor, 8. First micro peristaltic pump, 9. Second micro peristaltic pump, 10. Data processor, 11. Nitrogen inlet, 12. Liquid outlet, 13. Ultrasonic coupling agent injection / discharge port, 14. Light-tight and sound-insulating box encapsulation shell, 15. First sampling port, 16. Second sampling port; 17. Third sampling port, 71. Ultraviolet microreactor, 72. Ultrasonic microreactor, 73. Connection plate, 711. Nitrogen inlet pipeline, 712. Sampling pipeline, 713. Ultraviolet light source, 714. Gas outlet pipeline, 715. Waste liquid discharge pipeline, 716. First check valve, 717. Ultraviolet reaction cell, 721. Waterproof steel plate, 722. Ultrasonic reaction cell, 723. Ultrasonic transducer, 724. Second check valve, 725. Ultrasonic coupling agent injection / discharge pipeline. Detailed Embodiments

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figure 1 shown, the device for detecting total organic carbon by the ultraviolet coupled ultrasonic - persulfate method according to the present invention includes a light - proof and sound - insulating box encapsulation housing 14 to reduce light and noise pollution. One end of the light - proof and sound - insulating box encapsulation housing 14 is provided with a first sample inlet 15, a second sample inlet 16, and a third sample inlet 17, and the other end is provided with a nitrogen inlet 11, a liquid outlet 12, and an ultrasonic coupling agent injection / discharge port 13. Inside the light - proof and sound - insulating box encapsulation housing 14, there are a persulfate solution reaction tank 1, a phosphoric acid solution reaction tank 2, an ultrasonic controller 3, an ultraviolet controller 4, a CO 2 trap 5, a non - dispersive infrared detector 6, an ultrasonic - ultraviolet micro - reactor 7, a first micro peristaltic pump 8, a second micro peristaltic pump 9, and a data processor 10. The first sample inlet 15 and the second sample inlet 16 are connected to the persulfate solution reaction tank 1. The persulfate solution reaction tank 1 is connected to the phosphoric acid solution reaction tank 2 through the first micro peristaltic pump 8. The third sample inlet 17 is connected to the phosphoric acid solution reaction tank 2. The phosphoric acid solution reaction tank 2 is connected to the ultrasonic - ultraviolet micro - reactor 7 through the second micro peristaltic pump 9. The nitrogen inlet 11, the liquid outlet 12, and the ultrasonic coupling agent injection / discharge port 13 are respectively connected to the ultrasonic - ultraviolet micro - reactor 7. The ultrasonic - ultraviolet micro - reactor 7 is respectively connected to the ultrasonic controller 3, the ultraviolet controller 4, and the CO 2 trap 5. The CO 2 trap 5 is connected to the non - dispersive infrared detector 6, and the non - dispersive infrared detector 6 is connected to the data processor 10.

[0029] As Figure 2 shown, the ultrasonic - ultraviolet micro - reactor 7 according to the present invention includes an ultraviolet micro - reactor 71, an ultrasonic micro - reactor 72, and a connecting plate 73. The ultraviolet micro - reactor 71 is fixedly connected to the ultrasonic micro - reactor 72 through the connecting plate 73. The connecting plate 73 is a detachable fastener, and there is a hole in the middle with a diameter equivalent to that of the ultraviolet micro - reactor 71, and it is connected to the ultraviolet micro - reactor 71 and the ultrasonic micro - reactor 72 through buckles respectively.

[0030] As Figure 3As shown in the figure, the ultraviolet micro-reactor 71 of the present invention includes a nitrogen gas inlet pipe 711, a sample injection pipe 712, an ultraviolet light source 713, an outlet pipe 714, a waste liquid discharge pipe 715, a first check valve 716, and an ultraviolet reaction cell 717; the nitrogen gas inlet pipe 711 is fixed above the ultraviolet micro-reactor 71 and connected to the nitrogen gas inlet 11, the sample injection pipe 712 is fixed on one side of the ultraviolet micro-reactor 71 and connected to the second micro peristaltic pump 9, the ultraviolet light source 713 is a detachable fixture, fixed in the ultraviolet micro-reactor 71 by threads and connected to the ultraviolet controller 4 through a wire, the outlet pipe 714 is fixed above the ultraviolet micro-reactor 71 and connected to the CO 2 trap 5, both ends of the waste liquid discharge pipe 715 are connected to the liquid outlet 12 and the ultraviolet reaction cell 717, and the waste liquid discharge pipe 715 is provided with a first check valve 716 to prevent the waste liquid from flowing back and contaminating the sample to be measured.

[0031] As Figure 4 shown in the figure, the ultrasonic micro-reactor 72 includes a waterproof steel plate 721, an ultrasonic reaction cell 722, an ultrasonic transducer 723, a second check valve 724, and an ultrasonic coupling agent injection / discharge pipe 725; the ultrasonic transducer 723 is fixed at the bottom of the ultrasonic micro-reactor 72 and connected to the ultrasonic controller 3 through a wire, the waterproof steel plate 721 is located above the ultrasonic transducer 723 to prevent the ultrasonic coupling agent in the reaction cell from leaking and damaging the ultrasonic transducer 723, the ultrasonic reaction cell 722 is located above the waterproof steel plate 721 and connected to the ultrasonic coupling agent injection / discharge pipe 725, and the ultrasonic coupling agent injection / discharge pipe 725 is provided with a second check valve 724 and connected to the ultrasonic coupling agent injection / discharge port 13 to prevent the ultrasonic coupling agent from flowing back.

[0032] The method for detecting total organic carbon of a sample to be measured by using the above device is as follows. The specific process is: the solution to be measured and the persulfate solution enter the persulfate solution reaction tank 1 through the first sampling port 15 and the second sampling port 16 respectively. Since there is a magnetic stirrer inside the persulfate solution reaction tank 1, the solution to be measured and the persulfate solution are fully mixed by magnetic stirring. The mixed solution and the phosphoric acid solution enter the phosphoric acid solution reaction tank 2 together through the first micro peristaltic pump 8 and the third sampling port 17. Since there is a magnetic stirrer inside the phosphoric acid solution reaction tank 2, the mixed solution and the phosphoric acid solution are fully mixed by magnetic stirring, so as to effectively remove the inorganic carbon in the solution and adjust the pH of the solution at the same time. The reacted solution enters the ultraviolet micro-reactor 71 through the second micro peristaltic pump 9 and the sampling pipeline 712. Before the reaction, the ultrasonic coupling agent enters the ultrasonic reaction cell 722 through the ultrasonic coupling agent injection / discharge port 13 and the ultrasonic coupling agent injection / discharge pipeline 725, serving as the medium for energy transfer during the ultrasonic reaction. The ultrasonic controller 3 and the ultraviolet controller 4 are turned on, and the ultraviolet light source 713 and the ultrasonic transducer 723 are started. By controlling the ultrasonic and ultraviolet reactions, persulfate is activated to generate reactive free radicals, thereby converting pollutants into CO 2 After the reaction is complete, nitrogen is introduced into the ultraviolet micro-reactor 7 through the nitrogen inlet 11 and the nitrogen inlet pipeline 711, and the generated CO 2 is trapped by the CO 2 trap 5 from the ultraviolet reaction cell 717 through the outlet pipeline 714. The non-dispersive infrared detector 6 is connected to the CO 2 trap 5 to determine the concentration of CO 2 during the reaction process. Then, the data processor 10 converts the concentration of CO 2 into the TOC in the solution. After the reaction, the waste liquid is discharged from the liquid outlet 12 through the waste liquid discharge pipeline 715.

[0033] The method for detecting total organic carbon by the ultraviolet coupled ultrasonic-persulfate method according to the present invention includes the following steps:

[0034] S1: The sample to be measured and the persulfate solution enter the persulfate solution reaction tank 1 through the first sampling port 15 and the second sampling port 16 respectively and are mixed with each other. Then, the mixed solution is transported to the phosphoric acid solution reaction tank 2 by the first micro peristaltic pump 8. At the same time, the phosphoric acid solution enters the phosphoric acid solution reaction tank 2 through the third sampling port 17 to remove the inorganic carbon in the mixed solution and adjust the pH. The reacted solution then enters the ultraviolet reaction cell 717 in the ultrasonic-ultraviolet micro-reactor 7 through the second micro peristaltic pump 9 to await the reaction;

[0035] S2: The ultrasonic coupling agent enters the ultrasonic reaction cell 722 in the ultrasonic-ultraviolet micro-reactor 7 through the ultrasonic coupling agent injection / discharge port 13 to become the medium for ultrasonic energy transfer;

[0036] S3: Turn on the ultrasonic controller 3 and the ultraviolet controller 4 to activate the ultrasonic transducer 723 and the ultraviolet light source 713. Generate reactive free radicals by the reaction of ultrasound and ultraviolet light to activate persulfate, thereby rapidly degrading the organic matter in the solution and converting it into CO 2 ;

[0037] S4: Nitrogen enters the ultrasonic-ultraviolet micro-reactor 7 from the nitrogen inlet 11, and the CO 2 generated in the ultraviolet micro-reactor 71 is discharged through the outlet pipe 714;

[0038] S5: The CO 2 trap 5 traps the CO generated during the entire reaction process 2 , and transfers it to the non-dispersive infrared detector 6. Then, the data processor 10 converts the generated CO 2 data into the concentration of TOC in the solution.

[0039] Example 1

[0040] Add 97% tetracycline hydrochloride (TCH) solution to water to prepare a 100 μg / L TCH aqueous solution based on carbon. Use a micro syringe to aspirate 400 μL of the TCH aqueous solution and inject it into the injection port. Subsequently, add 2 ml of a 0.2 mol / L phosphoric acid solution and 3 mL of a 0.5 mol / L persulfate solution into the phosphoric acid solution reaction tank and the persulfate solution reaction tank respectively. Turn on the micro peristaltic pump to mix the sample with the persulfate solution and the phosphoric acid solution in sequence for 2 min to remove inorganic carbon. Then, transfer it to the ultrasonic-ultraviolet micro-reactor by the micro peristaltic pump. Turn on the ultrasonic controller and the ultraviolet lamp controller to catalyze the reaction of the sample for 2 min. Then, open the nitrogen inlet to purge the generated CO 2 gas through N 2 purge. Wait for the data processor to process after the CO 2 gas is captured. The measured TOC value is 99.9 μg / L. Finally, after the test, repeatedly clean the reactor with ultrapure water 3 times.

[0041] The above results show that the TOC detection device of the present invention can accurately and rapidly measure the TOC content in the sample to be measured, and its TOC detection sensitivity can reach 0.1 μg / L.

[0042] The working principle of the present invention: First, fully mix the sample to be measured with the persulfate activator; before the reaction, transfer the mixed solution to the phosphoric acid solution by a pump to remove the inorganic carbon in the solution to be measured. The mixed solution after removing the inorganic carbon is then pumped into the ultrasonic-ultraviolet micro-reactor for reaction; subsequently, use the energy of ultrasound and ultraviolet light to activate persulfate to generate reactive oxygen species and convert the organic matter into CO 2; The generated CO 2 is captured by the CO 2 trap and transmitted to a non-dispersive infrared detector, and finally the generated CO 2 data is converted into the concentration of TOC in the solution.

[0043] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent in such process, method, article or device.

[0044] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for detecting total organic carbon by ultraviolet-coupled ultrasound-persulfate method, characterized in that: The invention comprises a light-proof and soundproof box packaging shell (14), wherein one end of the light-proof and soundproof box packaging shell (14) is provided with a first sample inlet (15), a second sample inlet (16) and a third sample inlet (17), and one end of the light-proof and soundproof box packaging shell (14) is provided with a nitrogen inlet (11), a liquid outlet (12) and an ultrasonic coupling agent injection / discharge port (13); a persulfate solution reaction tank (1), a phosphoric acid solution reaction tank (2), an ultrasonic controller (3), an ultraviolet controller (4), a CO2 collector (5), a non-dispersive infrared detector (6), an ultrasonic-ultraviolet microreactor (7), a first micro peristaltic pump (8), a second micro peristaltic pump (9) and a data processor (10); the first sample inlet (15) is connected to the second sample inlet (16) A persulfate solution reaction tank (1) is connected to a phosphoric acid solution reaction tank (2) via a No. 1 micro peristaltic pump (8); a No. 3 sample inlet (17) is connected to the phosphoric acid solution reaction tank (2); the phosphoric acid solution reaction tank (2) is connected to an ultrasonic-ultraviolet microreactor (7) via a No. 2 micro peristaltic pump (9); a nitrogen inlet (11), a liquid outlet (12), and an ultrasonic coupling agent injection / discharge outlet (13) are respectively connected to the ultrasonic-ultraviolet microreactor (7); the ultrasonic-ultraviolet microreactor (7) is respectively connected to an ultrasonic controller (3), an ultraviolet controller (4), and a CO2 collector (5); the CO2 collector (5) is connected to a non-dispersive infrared detector (6); and the non-dispersive infrared detector (6) is connected to a data processor (10).

2. The device according to claim 1, characterized in that The ultrasonic-ultraviolet microreactor (7) comprises an ultraviolet microreactor (71), an ultrasonic microreactor (72) and a connecting plate (73); the ultraviolet microreactor (71) is fixedly connected to the ultrasonic microreactor (72) via the connecting plate (73); the connecting plate (73) is a detachable fixing member having a hole in the middle thereof having a diameter equivalent to that of the ultraviolet microreactor (71), and is respectively connected to the ultraviolet microreactor (71) and the ultrasonic microreactor (72) via buckles.

3. The device according to claim 2, characterized in that The ultraviolet microreactor (71) comprises a nitrogen inlet pipeline (711), a sample injection pipeline (712), an ultraviolet light source (713), an air outlet pipeline (714), a waste liquid discharge pipeline (715), a first check valve (716), and an ultraviolet reaction pool (717); the nitrogen inlet pipeline (711) is fixed above the ultraviolet microreactor (71) and connected to the nitrogen inlet port (11), the sample injection pipeline (712) is fixed to one side of the ultraviolet microreactor (71) and connected to the second micro-worm valve (11). The ultraviolet light source (713) is a detachable fixture, which is fixed in the ultraviolet microreactor (71) by threads and connected to the ultraviolet controller (4) by wires. The gas outlet pipe (714) is fixed above the ultraviolet microreactor (71) and connected to the CO2 collector (5). The waste liquid discharge pipe (715) is provided with a No. 1 check valve (716). Both ends of the waste liquid discharge pipe (715) are respectively connected to the liquid outlet (12) and the ultraviolet reaction pool (717).

4. The device according to claim 2, characterized in that The ultrasonic microreactor (72) comprises a waterproof steel plate (721), an ultrasonic reaction pool (722), an ultrasonic transducer (723), a second check valve (724), and an ultrasonic coupling agent injection / discharge pipe (725); the ultrasonic transducer (723) is fixed to the bottom of the ultrasonic microreactor (72) and connected to an ultrasonic controller (3) via a wire; the waterproof steel plate (721) is located above the ultrasonic transducer (723); the ultrasonic reaction pool (722) is located above the waterproof steel plate (721) and connected to the ultrasonic coupling agent injection / discharge pipe (725); the ultrasonic coupling agent injection / discharge pipe (725) is provided with a second check valve (724) and connected to an ultrasonic coupling agent injection / discharge port (13).

5. The device according to claim 1, characterized in that A magnetic particle is arranged inside the persulfate solution reaction tank (1), and a magnetic particle is arranged inside the phosphoric acid solution reaction tank (2).

6. A method for detecting total organic carbon by ultraviolet-coupled ultrasound-persulfate method, characterized in that: The device according to any one of claims 1 to 5 comprises the following steps: S1: The sample to be tested and the persulfate solution enter the persulfate solution reaction tank (1) through the No. 1 sampling port (15) and the No. 2 sampling port (16) respectively for mixing, and then are pumped into the phosphoric acid solution reaction tank (2) through the No. 1 micro peristaltic pump (8) for inorganic carbon removal and to adjust the pH of the system. Finally, the solution is pumped into the ultrasound-ultraviolet microreactor (7) through the No. 2 micro peristaltic pump (9); S2: The ultrasonic coupling agent enters the ultrasonic-ultraviolet microreactor (7) through the ultrasonic coupling agent injection / discharge port (13), the ultrasonic controller (3) and the ultraviolet controller (4) are turned on, and the solution in the ultrasonic-ultraviolet microreactor (7) is simultaneously activated by ultraviolet persulfate and ultrasonic persulfate, so that the organic matter in the sample is rapidly and completely mineralized and degraded into CO2; S3: Nitrogen enters the ultrasonic-ultraviolet microreactor (7) from the nitrogen inlet (11), the generated CO2 gas is purged with N2, collected by the CO2 collector (5), and the waste liquid after the reaction is discharged from the liquid outlet (12); S4: The captured mixed gas of CO2 and N2 is transported to a non-dispersive infrared detector (6) to obtain a sample signal; S5: The signal is processed by a data processor (10) to achieve CO2 quantification and output a TOC value.

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