Concentration detection device
Through the combination of microfluidic chips and fiber photometers, the automatic separation and detection of Pu(III) concentration in nuclear fuel post-treatment process is achieved, which solves the problem of Pu(IV) interference, simplifies operation and improves detection accuracy, and reduces the generation of radioactive waste liquid.
Patent Information
- Application Number
- CN202510495831.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-07-29
AI Technical Summary
In the prior art, Pu(III) concentration detection in nuclear fuel post-treatment process is susceptible to Pu(IV) interference, the operation is complex and the detection results are low, especially when the concentration of trace components is low, the signal is insensitive or signal-free.
A microfluidic chip is used to separate Pu(IV) and Pu(III), combined with an optical fiber photometer and data processing system, to realize the automatic separation and detection of sample solutions, simplify operation steps, and improve detection accuracy.
The operation steps are simplified, the accuracy of Pu(III) concentration detection is improved, the consumption of sample solution and the generation of radioactive waste liquid are reduced, and the difficulty of radioactive waste treatment is reduced.
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Figure CN120385629A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of nuclear fuel reprocessing technology, and particularly relates to a concentration detection device. Background Art
[0002] The concentration detection of Pu(III) in the nuclear fuel reprocessing technology is easily affected by a large amount of Pu(IV) therein. In order to detect the concentration of Pu(III), it is necessary to eliminate the interference of Pu(IV) through pretreatment, and at the same time, a highly sensitive detection method is required to obtain reliable signals of trace components. In the related art, solid-phase extraction is used instead of organic extractants for the separation of components, which can reduce the reagent consumption and shorten the analysis time. However, this method requires multiple manual steps such as column loading, elution, and elution. After separating Pu(IV) and Pu(III), sampling is carried out for measurement. If the concentration of trace components is low, dilution during the elution or elution process may lead to insensitive spectral signals or even no signals at all. Therefore, in the related art, the detection device has problems of complex operation and low accuracy of detection results. Summary of the Invention
[0003] In view of this, the embodiments of this application are expected to provide a concentration detection device, which can simplify the operation difficulty to a certain extent and improve the accuracy of the detection result of the Pu(III) concentration.
[0004] To solve the above problems, the technical solution of the embodiments of this application is implemented as follows:
[0005] The embodiments of this application provide a concentration detection device for detecting the concentration of Pu(III) in the nuclear fuel reprocessing technology. The concentration detection device includes:
[0006] A microfluidic chip, the microfluidic chip includes an extraction channel, and an inlet and an outlet are respectively formed at both ends of the extraction channel. An organic extractant and a sample solution enter the extraction channel through the inlet. The organic extractant is used to extract Pu(IV) in the sample solution and form an organic phase including Pu(IV) and an aqueous phase including Pu(III) to achieve the separation of Pu(IV) and Pu(III) in the sample solution;
[0007] Optical fiber photometer, the optical fiber photometer includes a liquid-core waveguide capillary cell, an optical fiber, a light source and a spectrometer, the liquid-core waveguide capillary cell is communicated with the outlet, and the aqueous phase enters the liquid-core waveguide capillary cell through the outlet; both the light source and the spectrometer are connected to the liquid-core waveguide capillary cell through the optical fiber, the light generated by the light source is transmitted to the liquid-core waveguide capillary cell through the optical fiber and is coupled with the aqueous phase, and the light transmitted by the optical fiber undergoes total internal reflection in the liquid-core waveguide capillary cell to transmit the light carrying the sample information to the spectrometer through the optical fiber for detection;
[0008] Data processing system, the data processing system is connected to the spectrometer, and the data processing system is used to convert the absorbance signal detected by the spectrometer to obtain the concentration of Pu(III).
[0009] In some embodiments, the length of the extraction channel is in the range of 10 cm to 15 cm.
[0010] In some embodiments, the width of the extraction channel is in the range of 200 μm to 400 μm.
[0011] In some embodiments, the depth of the extraction channel is in the range of 100 μm to 150 μm.
[0012] In some embodiments, the length of the liquid-core waveguide capillary cell is in the range of 10 cm to 50 cm.
[0013] In some embodiments, the volume of the liquid-core waveguide capillary cell is in the range of 0.04 mL to 0.2 mL.
[0014] In some embodiments, the organic extractant includes methyltrioctylammonium chloride.
[0015] In some embodiments, the concentration detection device further includes a first injection pump, and the first injection pump is used to inject the organic extractant into the extraction channel through the inlet.
[0016] In some embodiments, the concentration detection device further includes a second injection pump, and the second injection pump is used to inject the sample solution and / or the reference solution into the extraction channel through the inlet.
[0017] In some embodiments, the concentration detection device further includes a controller connected to the data processing system, and the controller is used to control the start and stop of the first injection pump and / or the second injection pump.
[0018] The concentration detection device according to the embodiments of the present application is provided with a microfluidic chip, a fiber optic photometer, and a data processing system. The microfluidic chip can be used to separate Pu(IV) and Pu(III) in a sample solution. The entire extraction process of the microfluidic chip helps to reduce the consumption of organic extractants and sample solutions while shortening the extraction time. In addition, detecting the concentration of Pu(III) through the fiber optic photometer and the data processing system helps to further reduce the consumption of sample solutions while shortening the analysis time. That is to say, the concentration detection device according to the embodiments of the present application can perform continuous sample injection, synchronous determination, and real-time monitoring of the concentration of Pu(III) in the sample solution. This detection device is simple, without a separation column, and without steps such as sample rinsing and elution, which simplifies the operation steps. In addition, the accuracy of the detection result of the Pu(III) concentration is improved. Moreover, since the amount of sample solution used is reduced, the generated radioactive waste liquid can be reduced, and the difficulty of radioactive waste treatment is lowered. Description of the Drawings
[0019] Figure 1 Schematic structural diagram of the concentration detection device according to some embodiments of the present application;
[0020] Figure 2 Schematic structural diagram of the liquid core waveguide capillary cell according to some embodiments of the present application;
[0021] Figure 3 Schematic structural diagram of the microfluidic chip according to some embodiments of the present application;
[0022] Description of the Reference Numerals
[0023] 10. Microfluidic chip; 11. Extraction channel; 12. Inlet; 121. First sub-inlet; 122. Second sub-inlet; 13. Outlet; 131. Third sub-outlet; 132. Fourth sub-outlet; 20. Fiber optic photometer; 21. Liquid core waveguide capillary cell; 22. Optical fiber; 23. Light source; 24. Spectrometer; 25. Fiber optic interface; 26. Sampling port; 27. Sample outlet; 30. Data processing system; 40. First syringe pump; 50. Second syringe pump; 60. Three-way valve; 70. Aqueous phase collection bottle; 80. Organic phase collection bottle; 90. Controller. Detailed Embodiments
[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. The following embodiments are only used to illustrate the technical solutions of the present application more clearly and thus are only examples and cannot be used to limit the protection scope of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the protection scope of the present application.
[0025] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.
[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0027] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.
[0028] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.
[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.
[0030] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0031] An embodiment of the present application provides a concentration detection device for detecting the concentration of Pu(III) in a nuclear fuel post-processing process.
[0032] See also Figures 1 to 3, The concentration detection device includes a microfluidic chip 10, a fiber optic photometer 20, and a data processing system 30. The microfluidic chip 10 includes an extraction channel 11, and an inlet 12 and an outlet 13 are respectively formed at both ends of the extraction channel 11. The organic extractant and the sample solution enter the extraction channel 11 through the inlet 12. The organic extractant is used to extract Pu(IV) in the sample solution and form an organic phase including Pu(IV) and an aqueous phase including Pu(III), so as to separate Pu(IV) and Pu(III) in the sample solution. The fiber optic photometer 20 includes a liquid core waveguide capillary cell 21, an optical fiber 22, a light source 23, and a spectrometer 24. The injection port 26 of the liquid core waveguide capillary cell 21 is communicated with the outlet 13, and the aqueous phase enters the liquid core waveguide capillary cell 21 through the outlet 13. Both the light source 23 and the spectrometer 24 are connected to the interface 25 of the liquid core waveguide capillary cell 21 through the optical fiber 22. The light generated by the light source 23 is transmitted to the liquid core waveguide capillary cell 21 through the optical fiber 22 and is coupled with the aqueous phase. The light transmitted by the optical fiber 22 undergoes total internal reflection in the liquid core waveguide capillary cell 21, so as to transmit the light carrying the sample information to the spectrometer 24 for detection. The data processing system 30 is connected to the spectrometer 24, and the data processing system 30 is used to convert the absorbance signal detected by the spectrometer 24 to obtain the concentration of Pu(III).
[0033] The microfluidic chip 10 (microfluidic chip) is a hot field in the development of the current Miniaturized Total Analysis Systems. The analysis of the microfluidic chip 10 takes the chip as the operation platform, and is based on analytical chemistry, relies on microelectromechanical processing technology, features a microchannel network, and takes life science as the current main application object. It is the focus of the development in the field of current Miniaturized Total Analysis Systems. Its goal is to integrate the functions of the entire laboratory, including sampling, dilution, reagent addition, reaction, separation, detection, etc. on the microchip, and it can be used multiple times.
[0034] Exemplarily, please refer to Figure 3 , the microfluidic chip 10 includes a glass substrate, and the extraction channel 11 is formed by fabricating on the glass substrate.
[0035] Exemplarily, please refer to Figure 3 , the inlet 12 includes a first sub-inlet 121 and a second sub-inlet 122. The organic extractant enters the extraction channel 11 through the first sub-inlet 121, and the sample solution enters the extraction channel 11 through the second sub-inlet 122.
[0036] Exemplarily, the first sub-inlet 121 and the second sub-inlet 122 are substantially in a Y-shaped structure with the extraction channel 11. The organic extractant and the sample solution converge at the Y-shaped joint of the first sub-inlet 121 and the second sub-inlet 122 and then enter the extraction channel 11.
[0037] Here, the flow rates of the organic extractant (organic phase) and the sample solution (aqueous phase) can be adjusted to maintain laminar flow of both in the extraction channel 11. The solution flows and diffuses in the extraction channel 11 to complete extraction separation, and an organic phase including Pu(IV) and an aqueous phase including Pu(III) are formed. The two phases are separated at the outlet 13 to achieve the separation of Pu(IV) and Pu(III) in the sample solution.
[0038] Exemplarily, please refer to Figure 3 , the outlet 13 includes a third sub-outlet 131 and a fourth sub-outlet 132. The organic phase including Pu(IV) flows out of the extraction channel 11 through the third sub-outlet 131, and the aqueous phase including Pu(III) enters and exits the extraction channel 11 through the fourth sub-outlet 132.
[0039] Exemplarily, please refer to Figure 3 , the third sub-outlet 131 and the fourth sub-outlet 132 are substantially in a Y-shaped structure with the extraction channel 11. The organic phase including Pu(IV) and the aqueous phase including Pu(III) are separated at the Y-shaped joint of the third sub-outlet 131 and the fourth sub-outlet 132 and then flow out of the extraction channel 11 through the third sub-outlet 131 and the fourth sub-outlet 132 respectively.
[0040] Exemplarily, the organic extractant includes methyltrioctylammonium chloride.
[0041] The single-stage extraction rate of methyltrioctylammonium chloride (Aliquat 336) for Pu(IV) is as high as over 96%, and it does not extract Pu(III). Therefore, using methyltrioctylammonium chloride as the organic extractant to separate Pu(IV) and Pu(III) in the extraction channel 11 can reduce the interference of Pu(IV) on Pu(III) or the interference generated can be ignored after separation.
[0042] Exemplarily, the liquid-core waveguide capillary cell 21 is a sample cell for spectrophotometric detection, and is connected to a light source 23 and a spectrometer 24 by an optical fiber 22. The aqueous phase including Pu(III) flowing out of the outlet 13 of the extraction channel 11 directly enters the sampling port 26 of the liquid-core waveguide capillary cell 21 and is coupled with the light transmitted by the optical fiber 22 at a T-shaped joint. The light is totally reflected in the liquid-core waveguide capillary cell 21, and then the light carrying the sample information is transmitted to the spectrometer 24 through the optical fiber 22 for detection. The data processing system 30 mobilizes the database to convert the absorbance signal and directly obtains the concentration of Pu(III) in the sample.
[0043] The concentration detection device according to the embodiment of the present application is provided with a microfluidic chip 10, a fiber optic photometer 20, and a data processing system 30. The microfluidic chip 10 can be used to separate Pu(IV) and Pu(III) in a sample solution. The entire extraction process of the microfluidic chip 10 helps to reduce the consumption of organic extractant and sample solution while shortening the extraction time. In addition, the concentration of Pu(III) is detected by the fiber optic photometer 20 and the data processing system 30, which helps to further reduce the consumption of sample solution while shortening the analysis time. That is to say, the concentration detection device according to the embodiment of the present application can perform continuous sampling, synchronous determination, and real-time monitoring of the concentration of Pu(III) in the sample solution. The detection device is simple, without a separation column, and without steps such as sample rinsing and elution, which simplifies the operation steps. In addition, the accuracy of the detection result of the Pu(III) concentration is improved. Moreover, since the amount of sample solution used is reduced, the generated radioactive waste liquid can be reduced, and the difficulty of radioactive waste treatment is lowered.
[0044] In some embodiments, please refer to Figure 3 , the length of the extraction channel 11 ranges from 10 cm to 15 cm.
[0045] Here, the length of the extraction channel 11 is equivalent to the flow distance of the liquid in the extraction channel 11.
[0046] The length of the extraction channel 11 can be any point value among 10 cm, 10.5 cm, 11 cm, 11.5 cm, 12 cm, 12.5 cm, 13 cm, 13.5 cm, 14 cm, 14.5 cm, 15 cm or any point value between any two of them.
[0047] In this embodiment, by setting the length of the extraction channel 11 to range from 10 cm to 15 cm, the extraction efficiency of the organic extractant for Pu(IV) can be improved while maintaining the laminar flow state.
[0048] In some embodiments, please refer to Figure 3 , the width of the extraction channel 11 ranges from 200 μm to 400 μm.
[0049] Here, if the width of the extraction channel 11 is too small, the laminar flow effect of the liquid will be affected. If the width of the extraction channel 11 is too large, the diffusion time will become longer, which will increase the consumption of the organic extractant and the sample solution and affect the extraction effect.
[0050] The width of the extraction channel 11 can be a point value of any one of 200μm, 210μm, 220μm, 230μm, 240μm, 250μm, 280μm, 300μm, 310μm, 330μm, 350μm, 360μm, 370μm, 390μm, 400μm or a point value between any two of them.
[0051] In this embodiment, by setting the width of the extraction channel 11 to be in the range of 200μm to 400μm, while reducing the consumption of the organic extractant and the sample solution, the extraction effect and extraction efficiency can be improved as much as possible, and the accuracy of the detection result of the Pu(III) concentration can be improved.
[0052] In some embodiments, refer to Figure 3 , the depth of the extraction channel 11 is in the range of 100μm to 150μm.
[0053] Here, if the depth of the extraction channel 11 is too small, it will affect the stable laminar flow effect of the liquid. If the depth of the extraction channel 11 is too large, it will increase the consumption of the organic extractant and the sample solution.
[0054] The depth of the extraction channel 11 can be a point value of any one of 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm or a point value between any two of them.
[0055] In this embodiment, by setting the depth of the extraction channel 11 to be in the range of 100μm to 150μm, while reducing the consumption of the organic extractant and the sample solution, maintaining the stable laminar flow of the liquid, the extraction effect and extraction efficiency can be improved as much as possible, and the accuracy of the detection result of the Pu(III) concentration can be improved.
[0056] In some embodiments, refer to Figure 2 , the length of the liquid-core waveguide capillary cell 21 is in the range of 10cm to 50cm.
[0057] Here, if the length of the liquid-core waveguide capillary cell 21 is too small, it will affect the sensitivity of the Pu(III) detection. If the length of the liquid-core waveguide capillary cell is too large, it will increase the noise of the instrument detection.
[0058] The length of the liquid-core waveguide capillary cell 21 can be any point value among 10 cm, 11 cm, 11.5 cm, 12 cm, 12.5 cm, 13 cm, 13.5 cm, 14 cm, 15 cm, 20 cm, 22 cm, 25 cm, 30 cm, 31 cm, 32 cm, 35 cm, 40 cm, 43.5 cm, 45 cm, 50 cm or a point value between any two of them.
[0059] In this embodiment, by setting the length of the liquid-core waveguide capillary cell 21 to be in the range of 10 cm to 50 cm, while reducing the consumption of the organic extractant and the sample solution, the optical path can be increased as much as possible, so that the analysis sensitivity of the concentration detection device is improved by an order of magnitude.
[0060] In some embodiments, please refer to Figures 1 to 2 , the volume of the liquid-core waveguide capillary cell 21 is in the range of 0.04 mL to 0.2 mL.
[0061] The volume of the liquid-core waveguide capillary cell 21 refers to the volume of the liquid that can be accommodated in the liquid-core waveguide capillary cell 21.
[0062] Here, if the volume of the liquid-core waveguide capillary cell 21 is too small, the accuracy of the detection result will be affected. If the volume of the liquid-core waveguide capillary cell 21 is too large, the consumption of the organic extractant and the sample solution will increase.
[0063] The volume of the liquid-core waveguide capillary cell 21 can be any point value among 0.04 mL, 0.06 mL, 0.08 mL, 0.1 mL, 0.12 mL, 0.13 mL, 0.15 mL, 0.16 mL, 0.18 mL, 0.2 mL or a point value between any two of them.
[0064] In this embodiment, by setting the volume of the liquid-core waveguide capillary cell 21 to be in the range of 0.04 mL to 0.2 mL, while reducing the consumption of the organic extractant and the sample solution, the accuracy of the detection result of the Pu(III) concentration by the concentration detection device can be increased as much as possible.
[0065] In some embodiments, please refer to Figure 1 , the concentration detection device further includes a first injection pump 40, and the first injection pump 40 is used to inject the organic extractant into the extraction channel 11 through the inlet 12.
[0066] Here, by setting the first injection pump 40, and the first injection pump 40 is used to inject the organic extractant into the extraction channel 11 through the inlet 12, it is beneficial to control the usage amount of the organic extractant.
[0067] In some embodiments, please refer to Figure 1, the concentration detection device further includes a second injection pump 50, and the second injection pump 50 is configured to inject the sample solution and / or the reference solution into the extraction channel 11 through the inlet 12.
[0068] Here, by providing the second injection pump 50 which is configured to inject the sample solution and / or the reference solution into the extraction channel 11 through the inlet 12, it is beneficial to achieve the control of the usage amount of the sample solution and / or the reference solution.
[0069] In some embodiments, refer to Figure 1 , the concentration detection device further includes a controller 90 connected to the data processing system 30, and the controller 90 is configured to control the start and stop of the first injection pump 40 and / or the second injection pump 50.
[0070] The controller 90 can set parameters such as the flow rates of the extractant, the sample solution, and the reference solution.
[0071] By providing the controller 90 and connecting the controller 90 to the data processing system 30, the parameters of the first injection pump 40 and / or the second injection pump 50 can be set through the data processing system 30. The first injection pump 40 injects the organic extractant into the microfluidic chip 10 at a certain flow rate, and the second injection pump 50 injects the sample solution and / or the reference solution into the microfluidic chip 10 at a certain flow rate, so as to realize the automated detection of the concentration detection device and improve the accuracy of the detection result of the Pu(III) concentration at the same time.
[0072] The microfluidic chip 10 is used for the separation of Pu(IV) and Pu(III) in the sample solution. The controller 90 can set parameters such as the flow rates of the extractant, the sample solution, and the reference solution. The first injection pump 40 injects the organic extractant into the microfluidic chip 10 at a certain flow rate, and the second injection pump 50 injects the sample solution and / or the reference solution into the microfluidic chip 10 at a certain flow rate. The liquid-core waveguide capillary cell 21 (LWCC), the light source 23, the spectrometer 24, the optical fiber 22, and the data processing system 30 are used for the concentration determination of Pu(III) and system control. The liquid-core waveguide capillary cell 21 (LWCC) is the sample cell of the fiber optic photometer 20. The light emitted by the light source 23 is input into the LWCC through the optical fiber 22, and then the sample information is transmitted to the spectrometer 24 for detection.
[0073] The data processing system 30 sets the parameters of the controller 90. The first injection pump 40 injects the organic extractant into the microfluidic chip 10 at a certain flow rate, and the second injection pump 50 injects the reference solution into the microfluidic chip 10 at a certain flow rate. No extraction occurs between the two phases in the microchannel. The 3 mol / L HNO3 reference solution flows out from the fourth sub-port 132 and enters the liquid-core waveguide capillary cell 21, and the spectrometer 24 obtains the signal value of the reference solution. Then, the first injection pump 40 injects the organic extractant into the microfluidic chip 10 at a certain flow rate, and the second injection pump 50 injects the sample solution into the microfluidic chip 10 at a certain flow rate. The data processing system 30 enables the real-time measurement function to measure the sample entering the liquid-core waveguide capillary cell 21 and obtain spectral information. When a smooth and stable sample spectrum appears at the interface, the sample separation effect is good, and the Pu(III) concentration value is given on the right side of the interface. This process can be continuously carried out to continuously obtain the Pu(III) concentration value. The sample in the liquid-core waveguide capillary cell 21 flows out through the sample outlet 27 and enters the aqueous phase collection bottle 70 for collection, and the organic phase flowing out of the microchip enters the organic phase collection bottle 80 for collection.
[0074] Exemplarily, when it is necessary to clean the liquid-core waveguide capillary cell 21, the data processing system 30 controls the three-way valve 60 to rotate to make the vertical pipeline flow through, and the reference solution can be used as the cleaning solution to clean the liquid-core waveguide capillary cell 21 to realize the reuse of the concentration detection device.
[0075] In a specific embodiment, the concentration detection device of the present application reduces the reagent consumption, shortens the analysis time, simplifies the operation steps, and reduces the generation of radioactive waste liquid. The length of the microfluidic chip 10 is about 15 cm, and the channel width is about 250 μm; a few microliters of solution can fill the extraction channel 11 to complete the separation of Pu(III) and Pu(IV). After the solution is separated by the extraction channel 11, the aqueous phase enters the liquid-core waveguide capillary cell 21. The optical path length of the liquid-core waveguide capillary cell 21 is 50 cm, and the diameter is 550 μm. After being filled, the sample consumption is within 0.2 mL. Therefore, the sample amount required for a single sample analysis is reduced by an order of magnitude compared with the prior art. After the methyltrioctylammonium chloride extractant and the sample solution come into contact in the extraction channel 11, they can flow out of the extraction channel 11 within a few seconds to complete the separation of Pu(III) and Pu(IV). After the aqueous phase enters the liquid-core waveguide capillary cell 21, it fills the liquid-core waveguide capillary cell 21 within dozens of seconds and flows out from the outlet 13. At the same time, the concentration of Pu(III) is also determined. Therefore, a single sample analysis can be completed within 1 minute. This device can perform continuous sample injection and synchronous measurement to monitor the concentration of Pu(III) in the sample in real time. The analysis device is simple, without a separation column, and without steps such as sample rinsing and elution. Only need to set the parameters, and use the data processing system 30 to control the sample injection and measurement, which greatly simplifies the operation steps. Since the sample consumption is very small, the amount of radioactive waste liquid generated is small, reducing the difficulty of radioactive waste treatment.
[0076] The concentration detection work process is as follows:
[0077] The data processing system 30 sets the parameters of the controller 90. The first injection pump 40 injects the organic extractant into the microfluidic chip 10 at a certain flow rate. The second injection pump 50 injects the reference solution into the microfluidic chip 10 at a certain flow rate. The reference solution flows out from the aqueous phase outlet 13 and enters the LWCC. The spectrometer 24 obtains the signal value of the reference solution;
[0078] The organic extractant and the sample solution are simultaneously pumped into the microfluidic chip 10 for extraction and separation; the aqueous phase flowing out from the microfluidic chip 10 directly enters the LWCC, and the flowing organic phase is collected and processed.
[0079] The data processing system 30 enables the real-time measurement function. When a smooth and stable sample spectrum appears on the interface of the data processing system 30, the sample separation effect is good;
[0080] After the data processing system 30 processes the spectral data in the background, it mobilizes the database to calculate the concentration of plutonium(III) in the sample, and the concentration value is displayed in real time on the right side of the interface;
[0081] After multiple measurements are completed, rotate the three-way valve 60 to make the vertical pipeline flow through, and the 3 mol / L HNO3 reference solution can also be used as a cleaning solution to clean the sample cell.
[0082] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.
Claims
1. A concentration detection device, characterized in that, For detecting the concentration of Pu(III) in the nuclear fuel reprocessing process, the concentration detection device includes: A microfluidic chip, the microfluidic chip includes an extraction channel, both ends of the extraction channel are respectively formed with an inlet and an outlet, an organic extractant and a sample solution enter the extraction channel through the inlet, and the organic extractant is used to extract Pu(IV) in the sample solution, and form an organic phase including Pu(IV) and an aqueous phase including Pu(III), so as to separate Pu(IV) and Pu(III) in the sample solution; An optical fiber photometer, the optical fiber photometer includes a liquid core waveguide capillary cell, an optical fiber, a light source and a spectrometer, the liquid core waveguide capillary cell is communicated with the outlet, and the aqueous phase enters the liquid core waveguide capillary cell through the outlet; both the light source and the spectrometer are connected to the liquid core waveguide capillary cell through the optical fiber, the light generated by the light source is transmitted to the liquid core waveguide capillary cell through the optical fiber, and is coupled with the aqueous phase, and the light transmitted by the optical fiber is totally reflected in the liquid core waveguide capillary cell, so as to transmit the light carrying the sample information to the spectrometer through the optical fiber for detection; A data processing system, the data processing system is connected to the spectrometer, and the data processing system is used to convert the absorbance signal detected by the spectrometer to obtain the concentration of Pu(III).
2. The concentration detection device according to claim 1, characterized in that, The length of the extraction channel is in the range of 10 cm to 15 cm.
3. The concentration detection device according to claim 1, characterized in that, The width of the extraction channel is in the range of 200 μm to 400 μm.
4. The concentration detection device according to claim 1, characterized in that, The depth of the extraction channel is in the range of 100 μm to 150 μm.
5. The concentration detection device according to claim 1, characterized in that The length of the liquid core waveguide capillary cell is in the range of 10 cm to 50 cm.
6. The concentration detection device according to claim 1, characterized in that The volume of the liquid core waveguide capillary cell is in the range of 0.04 mL to 0.2 mL.
7. The concentration detection device according to claim 1, characterized in that, The organic extractant includes methyltrioctylammonium chloride.
8. The concentration detection device according to claim 1, wherein The concentration detection device further includes a first injection pump, and the first injection pump is used to inject the organic extractant into the extraction channel through the inlet; and / or, The concentration detection device further includes a second injection pump, and the second injection pump is used to inject the sample solution and / or the reference solution into the extraction channel through the inlet.
9. The concentration detection device according to claim 8, wherein, The concentration detection device further includes a controller connected to the data processing system, and the controller is used to control the start and stop of the first injection pump and / or the second injection pump.