Trace uranium analyzer based on multiple times of standard addition and graphical analysis quality evaluation

Abstract

The utility model relates to the technical field of concentration measurement, in particular to a trace uranium analyzer based on multiple times of standard addition and graphical analysis quality evaluation, which comprises a sample part, a detection part and a counting part, the sample part and the detection part can be connected in a relative movement manner; when a reagent needs to be added into the sample part, the sample part is moved to the outside of the detection part; after a reagent is added into the sample part, the sample part is moved into the detection part, and the fluorescence intensity of the sample part is detected through the detection part; a counting part is arranged on the sample part and is used for counting the number of times of movement of the sample part relative to the detection part. The counting part is arranged to automatically record the moving times of the sample part, and in combination with data processing of the control part, automatic monitoring and data analysis in the experiment process are realized, human errors are reduced, and the result accuracy is improved.

Description

Technical Field

[0001] This application relates to the field of concentration measurement technology, and in particular to a trace uranium analyzer based on multiple standard additions and graphical analysis quality assessment. Background Technology

[0002] The Standard Addition Method is a commonly used quantitative analysis method in chemical analysis. Its core is to determine the concentration of the target component in the sample by adding a standard substance of known concentration to the sample.

[0003] The standard addition method procedure is as follows: Take n portions of sample with a volume of V and add them equally into n volumetric flasks. Take standard solutions of known concentrations with different concentration gradients and add them to the aforementioned volumetric flasks respectively. Dilute with water to the required mark and measure the corresponding signal response values. Plot the concentration of the standard solution on the x-axis and the signal response value on the y-axis to obtain a straight line with an intercept. Extend the line to intersect the x-axis; the concentration value at the intersection point is the concentration of the analyte in the sample.

[0004] The advantage of the standard addition method is that it avoids errors caused by matrix differences, making it particularly suitable for the analysis of samples with high matrix content and low concentration. However, its disadvantages are also obvious, including lower testing efficiency, the need for precise operation, the potential for errors, and the consumption of a large amount of sample.

[0005] To simplify the operation process, especially when the number of samples is small, many officially promulgated analytical standards adopt the method of adding standard substances to a single sample at a time to determine unknown samples.

[0006] However, existing technologies are prone to measurement errors due to limitations in the precision and accuracy of instruments and equipment, as well as operational precision. Furthermore, they are poor at measuring "precious samples" with complex quantitative analysis preparation processes (multiple physicochemical treatments) and limited quantities (such as blood samples, urine samples, etc.). Utility Model Content

[0007] The purpose of this application is to provide a trace uranium analyzer based on multiple standard additions and graphical analysis quality assessment, in order to solve at least one of the technical problems existing in the prior art.

[0008] To address the aforementioned technical issues, this application provides a trace uranium analyzer based on multiple standard additions and graphical analysis quality assessment, comprising a sample section, a detection section, and a counting section;

[0009] The sample section and the detection section are movably connected to each other;

[0010] When it is necessary to add reagent to the sample section, the sample section is moved to the outside of the detection section;

[0011] When a reagent is added to the sample section, the sample section is moved into the detection section, and the fluorescence intensity of the sample section is detected by the detection section.

[0012] The sample section is provided with a counting section, which is used to count the number of times the sample section moves relative to the detection section.

[0013] Furthermore, it also includes a display section;

[0014] The display section is a touch screen, which serves both as a display and for operating the analyzer.

[0015] Furthermore, it also includes a control unit;

[0016] The display unit, the detection unit, and the counting unit are all electrically connected to the control unit;

[0017] The control unit is used to receive and process the detection results and counting data of the detection unit and the counting unit, and transmit the processed results to the display unit. The control unit is also controlled by the display unit, thereby controlling the operation of the device.

[0018] Furthermore, the sample section includes a sample dish, a sample tray, and a tray guide rail;

[0019] The sample dish is placed on the sample tray and is used to hold reagents;

[0020] One end of the tray guide rail is fixedly connected to the sample tray;

[0021] The end of the tray guide rail away from the sample tray is connected to the counting unit.

[0022] Furthermore, the tray guide rail includes a track and a slider, wherein the slider has the same axial length as the track;

[0023] The slider is fixedly connected to the sample tray;

[0024] The end of the track away from the sample tray is fixedly connected to the counting unit;

[0025] When a reagent is added to the sample section, the slider end moves closer to the counting section as the sample section moves into the detection section.

[0026] The counting unit and the slider automatically count after the distance reaches a critical distance.

[0027] Furthermore, the detection unit includes a darkroom and a fluorescence detector;

[0028] After the sample in the sample section enters the dark chamber, the fluorescence intensity of the sample is detected by the fluorescence detector.

[0029] Furthermore, the detection unit also includes an excitation light source;

[0030] One end of the excitation light source receives external power via a cable, while the other end extends into the dark chamber and provides energy to the sample, causing the uranyl ion complex in the sample to transition from the ground state to a high-energy state, thereby emitting fluorescence of a specific wavelength.

[0031] Furthermore, the fluorescence detector is a photomultiplier tube, which is disposed on the dark chamber and communicates with the dark chamber;

[0032] When the sample in the dark chamber emits fluorescence, the photomultiplier tube receives the fluorescence and converts it into an electrical signal.

[0033] Furthermore, the control unit is a control circuit that includes a processor;

[0034] The control unit matches the measured fluorescence intensity and count data, obtains the sample concentration through detection calculation methods and visualization, and transmits the information to the display unit for display.

[0035] Furthermore, it also includes the outer shell;

[0036] The control unit, the detection unit, and the counting unit are disposed within the housing.

[0037] The display unit is disposed on the outer surface of the housing;

[0038] The sample section is housed within the outer casing and is removed when reagents need to be added.

[0039] By adopting the above technical solution, this application has the following beneficial effects:

[0040] (1) The counting unit automatically records the number of times the sample unit moves. Combined with the data processing of the control unit, it realizes the automated monitoring and data analysis of the experimental process, reduces human error, and improves the accuracy of the results.

[0041] (2) The touch screen not only provides a clear display function, but also allows users to operate the analyzer directly, which enhances the user interaction experience and makes the operation more intuitive and convenient.

[0042] (3) The sample section adopts a combination of sample dish, sample tray and tray rail to ensure the accuracy and stability of reagent addition; the cooperation between the rail and the slider makes the counting process more reliable, while maintaining the compactness and durability of the equipment.

[0043] (4) The combination of a darkroom and a fluorescence detector, especially the use of a photomultiplier tube as a detector, greatly improves the detection sensitivity of trace uranium and can accurately measure the fluorescence intensity of the sample, thereby accurately calculating the sample concentration.

[0044] (5) The control unit, detection unit and counting unit are integrated into the housing, which protects the internal components and keeps the equipment clean and portable; at the same time, this modular design facilitates maintenance and upgrades.

[0045] (6) By combining measurement data with graphical analysis through the control unit, the changes in sample concentration can be displayed intuitively, providing researchers with richer information support and helping to understand and analyze experimental results in depth. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the three-dimensional structure of a trace uranium analyzer;

[0048] Figure 2 This is a three-dimensional structural diagram of the sample section and the detection section in the closed state;

[0049] Figure 3 A three-dimensional structural diagram of the sample section and the detection section in the open state;

[0050] Figure 4 This is a flowchart illustrating the specific measurement methods that can be used in the analyzer;

[0051] Figure 5 This is a schematic diagram of the data distribution in Example 2;

[0052] Figure 6 This is a partial distribution map of the data scatter points in Example 2;

[0053] Figure 7 This is the display interface for a trace uranium analyzer.

[0054] Figure 8 for Figure 7 A magnified view of a portion of the image.

[0055] Figure label:

[0056] 1-Sample section; 2-Detection section; 3-Counting section; 4-Display section; 5-Control section; 6-Sample dish; 7-Sample tray; 8-Railway; 9-Slider; 10-Dark chamber; 11-Excitation light source; 12-Photomultiplier tube; 13-Outer shell; 14-Claw. Detailed Implementation

[0057] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed in this application to further explain the specific application content, and these settings can be combined or used in conjunction with each other.

[0061] The present application will be further explained below with reference to specific implementation methods.

[0062] Example 1

[0063] like Figure 1-3 As shown, this embodiment provides a trace uranium analyzer based on multiple standard additions and graphical analysis quality assessment to solve at least one technical problem existing in the prior art.

[0064] To solve the above-mentioned technical problems, this application provides a trace uranium analyzer based on multiple standard additions and graphical analysis quality assessment, which includes a sample section 1, a detection section 2, and a counting section 3;

[0065] The sample section 1 and the detection section 2 are movably connected to each other;

[0066] When it is necessary to add reagent to the sample section 1, the sample section 1 is moved to the outside of the detection section 2;

[0067] When a reagent is added to the sample section 1, the sample section 1 is moved into the detection section 2, and the fluorescence intensity of the sample section 1 is detected by the detection section 2.

[0068] The sample section 1 is provided with a counting section 3, which is used to count the number of times the sample section 1 moves relative to the detection section 2.

[0069] like Figure 1 As shown, as a further embodiment of this example, a display unit 4 is also included;

[0070] Display unit 4 is a touch screen, which can be used for both display and operation of the analyzer.

[0071] like Figure 1 As shown, as a further embodiment of this example, a control unit 5 is also included;

[0072] The display unit 4, the detection unit 2, and the counting unit 3 are all electrically connected to the control unit 5;

[0073] The control unit 5 is used to receive the detection results and counting data of the detection unit 2 and the counting unit 3, process them, and transmit the processed results to the display unit 4. The control unit 5 is also controlled by the display unit 4, thereby controlling the operation of the device.

[0074] like Figure 3 As shown, as a further embodiment of this example, the sample section 1 includes a sample dish 6, a sample tray 7, and a tray guide rail;

[0075] The sample dish 6 is placed on the sample tray 7 and is used to hold reagents;

[0076] One end of the tray guide rail is fixedly connected to the sample tray 7;

[0077] The end of the tray guide rail away from the sample tray 7 is connected to the counting unit 3.

[0078] like Figure 2-3As shown, as a further embodiment of this example, the tray guide rail includes a track 8 and a slider 9, wherein the slider 9 has the same axial length as the track 8;

[0079] The slider 9 is fixedly connected to the sample tray 7;

[0080] The end of the track 8 away from the sample tray 7 is fixedly connected to the counting unit 3;

[0081] When a reagent is added to the sample section 1, and the sample section 1 is moved into the detection section 2, the end of the slider 9 approaches the counting section 3.

[0082] The counting unit 3 and the slider 9 automatically count after the distance reaches a critical distance.

[0083] The critical distance is a preset distance. If the preset distance is 0, it means that the slider 9 needs to come into contact with the counter before the counter counts. If the preset distance is greater than 0 (e.g., 0.5mm), the distance can be monitored by laser ranging. When the distance between the slider 9 and the counter is detected to be less than the preset distance, automatic counting is performed.

[0084] like Figure 2-3 As shown, in a further embodiment of this example, the detection unit 2 includes a dark chamber 10 and a fluorescence detector;

[0085] After the sample in the sample section 1 enters the dark chamber 10, the fluorescence intensity of the sample is detected by the fluorescence detector.

[0086] like Figure 2-3 As shown, in a further embodiment of this invention, the detection unit 2 further includes an excitation light source 11;

[0087] One end of the excitation light source 11 receives external power through a cable, and the other end extends into the dark chamber 10 to provide energy to the sample, causing the uranyl ion complex in the sample to transition from the ground state to a high-energy state, thereby emitting fluorescence of a specific wavelength.

[0088] like Figure 2-3 As shown, as a further embodiment of this example, the fluorescence detector is a photomultiplier tube 12, which is disposed on the dark chamber 10 and communicates with the dark chamber 10.

[0089] When the sample in the dark chamber 10 emits fluorescence, the photomultiplier tube 12 receives the fluorescence and converts it into an electrical signal.

[0090] As a further embodiment of this embodiment, the control unit 5 is a control circuit including a processor;

[0091] The control unit 5 matches the measured fluorescence intensity and count data, obtains the sample concentration through detection calculation methods and visualization, and transmits the information to the display unit 4 for display.

[0092] like Figure 1 As shown, as a further embodiment of this invention, an outer shell 13 is also included;

[0093] The control unit 5, the detection unit 2, and the counting unit 3 are disposed inside the outer casing 13;

[0094] The display unit 4 is disposed on the outer surface of the housing 13;

[0095] The sample section 1 is disposed inside the outer casing 13 and is removed when reagents need to be added.

[0096] like Figure 2-3 As shown, as a further embodiment of this example, the counting unit 3 also includes a limit switch. The operator touches the display unit 4 to transmit the command to the control unit 5, which controls the limit switch to open or close.

[0097] like Figure 2-3 As shown in the preferred embodiment, the limit switch is an opening and closing claw 14, and the slider 9 is provided with a slot corresponding to the claw 14. The claw 14 locks and unlocks the slider 9 by cooperating with the slot.

[0098] In a preferred embodiment of this invention, a sensor (not shown in the figure) is provided at the corresponding position of the claw 14 and the slot, which is electrically connected to the counter. When the claw 14 engages with the slot, the sensor is triggered, and the counter performs one count.

[0099] The analyzer disclosed in this application, during operation, slides the sample section 1 along the tray guide rail to transfer the reagent into the sample dish 6, and then slides the sample section 1 back along the tray guide rail, allowing the sample dish 6 containing the reagent to enter the dark chamber 10. At this time, the slider 9 triggers the counting unit 3 to start automatic counting. The counting unit 3 is preferably a counter, which records the x-th measurement (where x is a non-zero positive integer, such as 1, 2, 3). After the excitation light source 11 is turned on, the ultraviolet light pulse emitted by the excitation light source 11 excites the reagent, producing fluorescence of specific wavelengths (such as 500nm, 522nm, 546nm). The instrument determines the uranium content in the sample by detecting these fluorescence signals. At this time, the light signal shines on the cathode of the photomultiplier tube 12, exciting photoelectrons. These photoelectrons are accelerated under the action of the electric field and collide with the dynode, generating more secondary photoelectrons. Through the cascade amplification of multiple dynodes, the weak light signal is finally converted into an electrical signal and output to the control unit 5. The control unit 5 generates a fluorescence intensity reading Fx by converting the counter's counting signal into an electrical signal.

[0100] like Figure 7-8 The image shows the display and operation interface of the analyzer disclosed in this application during actual use.

[0101] Example 2

[0102] like Figure 4-6 As shown, this embodiment provides a measurement method that can be used in the analyzer of Embodiment 1, wherein the sample contains uranium of unknown concentration to be measured, and the standard solution added each time is a uranium standard solution of known concentration.

[0103] like Figure 4 As shown, this application provides a concentration measurement method based on multiple standard additions and graphical analysis, including the following steps:

[0104] S1: Measure the fluorescence intensity reading F0 of the sample background and the sample background volume V2.

[0105] S2: Add a fluorescence enhancer with a volume of V0 to the sample background.

[0106] S3: Measure the fluorescence intensity reading F1 of the sample after adding the fluorescence enhancer;

[0107] Calculate the fluorescence intensity F1-F0 produced by the sample.

[0108] S4: Add volume V1 and concentration C to the sample for the (N-1)th time. D The uranium standard solution, where N is an integer starting from 2, and successively from 2, 3, 4 to positive infinity.

[0109] S5: Measure the fluorescence intensity reading FN of the sample after the addition of uranium standard solution;

[0110] Through formula C SN = × ×C D Calculate the sample concentration C SN .

[0111] S6: Repeat steps S4 and S5, and record the fluorescence intensity and sample concentration of the sample after each operation.

[0112] Furthermore, the steps include:

[0113] S7: Plot a scatter plot with sample concentration on the x-axis and fluorescence intensity reading on the y-axis.

[0114] Furthermore, the steps include:

[0115] S8: Analyze the correlation coefficients of the data in the scatter plot;

[0116] If the correlation coefficient r is greater than 0.9995, the measurement results are reliable, and step S:9 is executed;

[0117] If the correlation coefficient r is less than 0.9995, the measurement results are unreliable and the measurement should be terminated.

[0118] Furthermore, the steps include:

[0119] S9: Fit the scatter points to a line segment and extend it to intersect the horizontal axis. The absolute value of the concentration at the intersection point is the concentration of the uranium to be measured in the sample.

[0120] like Figure 5 As shown, in this embodiment, N is set to 2-4, and a slope with a smaller error is obtained by statistically calculating the four data points F1, F2, F3, and F4. The statistical algorithm selected in this application employs existing technologies, including but not limited to averaging, removing outliers, and linear regression.

[0121] like Figure 6 As shown in the diagram, R 2 The value of R represents the correlation between the four data points and can be used to quantitatively evaluate the quality of measurement data. 2 That is, the square of the correlation coefficient r, where R is shown in the diagram. 2 =0.9589 corresponds to r=0.9792. In step S9 of this application, it is specified that r is greater than 0.9995 (i.e., R0). 2 A value greater than 0.999 indicates a reliable result; otherwise, it indicates a serious measurement error.

[0122] This application calculates the sample concentration C. SN The formula is derived from the following formula. For each addition of uranium standard solution, the uranium content can be expressed as C. D×V1. When N=2, the concentration change value D= The slope K of the graph reflects the quantitative relationship between concentration change and reading value under the current environment; the formula is K. By the definition of slope, we know that F1 - F0 = C S K. Substituting K into the formula, we get F1 - F0 = C S × After rearranging the formula and substituting it into the formula for D, we get C. S = × ×C D When N is a different value, the formula C is derived based on the corresponding uranium content. SN = × ×C D .

[0123] Compared with existing technologies, this application uses a method of adding uranium standard solution multiple times to obtain multiple measurement values. The following description uses ultraviolet fluorescence method for uranium determination as an example to illustrate existing technologies. The basic principle of ultraviolet fluorescence method for uranium determination is that in a liquid sample, uranyl ions can form a single complex with high fluorescence efficiency and extended fluorescence decay lifetime under the action of a uranium fluorescence enhancer. This complex produces fluorescence under ultraviolet light or other light sources, and its fluorescence intensity is proportional to the uranium concentration in the sample. Therefore, by measuring the fluorescence intensity, the uranium concentration in the sample can be obtained.

[0124] The industry standard "EJ / T823-2016 Fluorescent Trace Uranium Analyzer" issued by the State Administration of Science, Technology and Industry for National Defense mainly specifies the equipment, technical indicators, and testing methods for uranium determination using the ultraviolet fluorescence method. The national environmental protection standard "HJ840-2017 Analytical Methods for Trace Uranium in Environmental Samples" issued by the Ministry of Environmental Protection specifies the detailed analytical methods.

[0125] The disadvantage of ultraviolet fluorescence determination of uranium is that the fluorescence intensity is greatly affected by ambient temperature; therefore, the standard addition method is generally used for measurement and analysis. This method can typically complete sample analysis within 10 minutes, during which time the temperature generally does not change drastically, so the effect of temperature can be ignored.

[0126] The formula for determining uranium concentration using the standard addition method is C. S = × ×C D Where F0 is the fluorescence intensity reading of the sample background, F1 is the fluorescence intensity reading of the sample after adding uranium fluorescence enhancer, F2 is the fluorescence intensity reading of the sample after adding uranium standard solution, V1 is the volume of the added uranium standard solution, V2 is the sample volume, and V0 is the volume of the added fluorescence enhancer.

[0127] This formula ignores certain influencing factors, thus inherently contains errors across the entire measurement range. Therefore, industry standards specify a relatively large allowable range for measurement accuracy errors (not exceeding ±10%), and accuracy assessment standards are only applied at a specific point (4 ng / mL sample).

[0128] Using simulation data, this calculation reveals that the higher the concentration of the uranium standard solution, the smaller the measurement error; however, the higher the concentration of the sample, the greater the calculation error.

[0129] Based on the above description of the prior art, it can be seen that the prior art has three obvious problems:

[0130] 1. Selecting the concentration of uranium standard solution is quite complicated.

[0131] According to the standard (HJ840-2017), for low-concentration samples, select 50 μL of uranium standard solution with a concentration of 100 ng / mL; for high-concentration samples, select 50 μL of uranium standard solution with a concentration of 500 ng / mL.

[0132] When faced with samples of unknown concentration, users need to first measure them using a 100 ng / mL standard solution. If the calculated concentration is found to be too high, a 500 ng / mL standard solution must be used for another measurement to obtain a more accurate result. For users whose samples are very valuable, the current method results in significant sample waste.

[0133] In actual testing, users typically choose a high-concentration uranium standard solution of 1 μg / mL and a dosage of 5 μL, striving to complete the measurement in one go within the allowable error range. However, choosing a high-concentration uranium standard solution inevitably involves a small dosage, which raises the next issue.

[0134] 2. Over-reliance on F2 data

[0135] The accuracy of F2 data obtained by adding high-concentration, micro-volume uranium standard solution is highly dependent on the accuracy of the solution addition operation. Especially with high-concentration samples, even small deviations in the slope calculated from the F2-F1 values ​​and the added solution volume have a significant impact on the slope calculated from the F1-F0 values: a slightly larger slope will result in a smaller calculated result, and a slightly smaller slope will result in a larger calculated result. These deviations are often due to the inherent precision (repeatability) of the solution addition tool (micro-volume pipette), which is beyond the control of the operator.

[0136] Discrete measurement results are the second major challenge of standardization methods.

[0137] 3. The "quality" of the measurement results cannot be directly judged.

[0138] Only one calculation result can be obtained from the three data points. Its quality can only be guaranteed by factors such as "equipment meets standards," "instruments meet standards," and "skilled operation without errors," to ensure the result meets requirements.

[0139] In view of the shortcomings of the prior art, this application makes further improvements to the standard inclusion method.

[0140] like Figure 5-6 The diagram shows the distribution of measured values ​​after three additions of uranium standard solution to a sample of known concentration. In this embodiment, based on three measured values ​​(F0, F1, F2) obtained using the standard method, the same uranium standard solution was added multiple times to obtain further measured values ​​(F3, F4). It should be noted that the distribution of measured points in the diagram is exaggerated (artificially increasing the measurement error) to more intuitively illustrate the impact of error data on test accuracy. The F1 line and its extension in the diagram represent the characteristic lines of the sample under test, obtained by acquiring two additional readings (F3 and F4) besides F1 and F2. The slope of these four readings is calculated statistically to determine the sample concentration. Comparing this to the F12 line (a common method in existing technologies) reveals a larger error. The final concentration result obtained through the statistical algorithm is also superior to the result obtained using the F12 slope, and exhibits less dispersion.

[0141] By adopting the above technical solution, the present invention has the following beneficial effects:

[0142] (1) By adding uranium standard solution multiple times and measuring fluorescence intensity, more data points were obtained. Statistical calculations, such as linear regression, using these data can yield a more accurate slope, thereby improving the accuracy of sample concentration calculation. This method reduces errors caused by inaccurate single measurements or inaccurate liquid addition operations.

[0143] (2) By drawing a scatter plot and analyzing the correlation coefficient, the reliability of the measurement results can be judged intuitively. When the correlation coefficient is greater than 0.9995, the measurement results are considered reliable. This step provides an objective basis for the judgment of the results and avoids relying solely on the subjective guarantee of equipment, instruments and operating standards.

[0144] (3) This technical solution processes multiple measurement values ​​through graphical analysis and statistical algorithms, which not only improves the accuracy of the results but also reduces the dispersion of the results, making the measurement results more stable and reliable.

[0145] (4) Although this technical solution is described using ultraviolet fluorescence method for uranium determination as an example, its basic principle and method are also applicable to other occasions where concentration needs to be measured. It is only necessary to adjust the type and concentration of fluorescence enhancer and standard solution according to the specific situation.

[0146] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A trace uranium analyzer based on multiple standard additions and graphical analysis quality assessment, characterized in that: It includes a sample section, a detection section, and a counting section; The sample section and the detection section are movably connected to each other; When it is necessary to add reagent to the sample section, the sample section is moved to the outside of the detection section; When a reagent is added to the sample section, the sample section is moved into the detection section, and the fluorescence intensity of the sample section is detected by the detection section. The sample section is provided with a counting section, which is used to count the number of times the sample section moves relative to the detection section.

2. The trace uranium analyzer according to claim 1, characterized in that, It also includes a display unit; The display section is a touch screen, which serves both as a display and for operating the analyzer.

3. The trace uranium analyzer according to claim 2, characterized in that, It also includes the control unit; The display unit, the detection unit, and the counting unit are all electrically connected to the control unit; The control unit is used to receive and process the detection results and counting data of the detection unit and the counting unit, and transmit the processed results to the display unit. The control unit is also controlled by the display unit, thereby controlling the operation of the device.

4. The trace uranium analyzer according to claim 1, characterized in that, The sample section includes a sample dish, a sample tray, and a tray guide rail; The sample dish is placed on the sample tray and is used to hold reagents; One end of the tray guide rail is fixedly connected to the sample tray; The end of the tray guide rail away from the sample tray is connected to the counting unit.

5. The trace uranium analyzer according to claim 4, characterized in that, The tray guide rail includes a track and a slider, wherein the slider has the same axial length as the track; The slider is fixedly connected to the sample tray; The end of the track away from the sample tray is fixedly connected to the counting unit; When a reagent is added to the sample section, the slider end moves closer to the counting section as the sample section moves into the detection section. The counting unit and the slider automatically count after the distance reaches a critical distance.

6. The trace uranium analyzer according to claim 1, characterized in that, The detection unit includes a darkroom and a fluorescence detector; After the sample in the sample section enters the dark chamber, the fluorescence intensity of the sample is detected by the fluorescence detector.

7. The trace uranium analyzer according to claim 6, characterized in that, The detection unit also includes an excitation light source; One end of the excitation light source receives external power via a cable, while the other end extends into the dark chamber and provides energy to the sample, causing the uranyl ion complex in the sample to transition from the ground state to a high-energy state, thereby emitting fluorescence of a specific wavelength.

8. The trace uranium analyzer according to claim 6, characterized in that, The fluorescence detector is a photomultiplier tube, which is mounted on the dark chamber and communicates with it. When the sample in the dark chamber emits fluorescence, the photomultiplier tube receives the fluorescence and converts it into an electrical signal.

9. The trace uranium analyzer according to claim 3, characterized in that, The control unit is a control circuit that includes a processor; The control unit matches the measured fluorescence intensity and count data, obtains the sample concentration through detection calculation methods and visualization, and transmits the information to the display unit for display.

10. The trace uranium analyzer according to claim 3, characterized in that, It also includes the outer casing; The control unit, the detection unit, and the counting unit are disposed within the housing. The display unit is disposed on the outer surface of the housing; The sample section is housed within the outer casing and is removed when reagents need to be added.

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