Colorimetric tube, water quality detection device and water quality detection method

Abstract

The application is suitable for the technical field of water quality analysis, and provides a colorimetric tube, a water quality detection device and a water quality detection method. The water quality detection device comprises the colorimetric tube. The colorimetric tube has a first interface and a second interface. The first interface is used for assembling a light emitting module, and the second interface is used for assembling a light receiving module. The colorimetric tube comprises a first tube body and a diffuse reflection layer. The first tube body has a first liquid passage opening and a second liquid passage opening arranged oppositely. The diffuse reflection layer is arranged on the first tube body and is configured to diffuse light into the first tube body. The first interface and the second interface are both arranged on the first tube body and / or the diffuse reflection layer and are both located between the first liquid passage opening and the second liquid passage opening. In this way, the light intensity of the entire inner surface of the first tube body is basically the same, thereby having the effect of resisting turbidity interference, without the need for additional turbidity compensation operation, and helping to improve the accuracy of the water quality detection result.

Description

Technical Field

[0001] This application belongs to the field of water quality analysis technology, and more specifically, relates to a colorimetric tube, a water quality testing device, and a water quality testing method. Background Technology

[0002] Currently, most water quality testing methods are based on the principle of spectrophotometry. Specifically, the water sample to be tested is first subjected to digestion and color development reactions in sequence. Then, light of a specific wavelength is passed into the water sample to be tested, and the corresponding light signal is obtained. The absorbance of the water sample to be tested is calculated from the obtained light signal, and then the concentration of the analyte in the water sample is obtained.

[0003] However, the water sample to be tested generally has a certain degree of turbidity. When light is passed into the water sample, the turbidity particles in the water sample will scatter during the light transmission process, causing the light intensity to change, that is, the absorbance to change. This will interfere with the water quality test results. In particular, when the concentration of the measured factor in the water sample is low, the influence of turbidity particles will greatly reduce the accuracy of the test results. Summary of the Invention

[0004] One of the objectives of this application is to provide a colorimetric tube that addresses the technical problem in the prior art where the turbidity of the water sample leads to inaccurate water quality detection results.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of this application is as follows:

[0006] In a first aspect, a colorimetric tube is provided, the colorimetric tube having a first interface and a second interface, the first interface being used for assembling a light emitting module, and the second interface being used for assembling a light receiving module; the colorimetric tube includes:

[0007] The first tube body has a first liquid inlet and a second liquid inlet that are disposed opposite to each other;

[0008] A diffuse reflection layer is disposed in the first tube body and configured to diffusely reflect light into the first tube body; both the first interface and the second interface are opened in the first tube body and / or the diffuse reflection layer, and both are located between the first liquid inlet and the second liquid inlet.

[0009] In one embodiment, a diffuse reflection layer is disposed on the outer wall of the first tube, and a light blocking layer is disposed on the other side of the diffuse reflection layer relative to the first tube. The first tube is a light-transmitting structure.

[0010] Alternatively, the diffuse reflection layer is disposed on the inner wall of the first tube, and the first tube is an opaque structure, with a light-transmitting protective layer disposed on the other side of the diffuse reflection layer relative to the first tube.

[0011] Alternatively, a diffuse reflection layer is disposed on the inner wall of the first tube, and a light-blocking layer is disposed between the inner wall of the first tube and the diffuse reflection layer, and a light-transmitting protective layer is disposed on the other side of the diffuse reflection layer relative to the first tube.

[0012] In one embodiment, the first tube is spherical.

[0013] In one embodiment, the first interface has a diffusion range for the light emitted by the light-emitting module to diffuse, and the second interface is located outside the diffusion range.

[0014] In one embodiment, both the first interface and the second interface are located at the middle position between the first liquid inlet and the second liquid inlet.

[0015] In one embodiment, the colorimetric tube further includes a second tube body, the second tube body having a third liquid inlet and a fourth liquid inlet disposed opposite to each other, the second tube body being disposed on the first tube body, and the second liquid inlet and the third liquid inlet being connected.

[0016] In one embodiment, a transition pipe is provided between the second pipe body and the first pipe body, and the two ends of the transition pipe are respectively connected to the second liquid inlet and the third liquid inlet.

[0017] In one embodiment, both the second tube and the transition tube are transparent structures.

[0018] Secondly, a water quality testing device is provided, comprising:

[0019] Digestion unit;

[0020] The colorimetric unit includes a colorimetric tube, a light emitting module disposed on a first interface, and a light receiving module disposed on a second interface.

[0021] Thirdly, a water quality testing method is provided, which is implemented using a water quality testing device, including a colorimetric tube. The water quality testing method includes the following steps:

[0022] The digested water sample to be tested is passed into the first tube to carry out a colorimetric reaction to obtain a colorimetric solution, and the liquid level of the colorimetric solution is located in the second tube.

[0023] The colorimetric solution is drawn out of the first tube and the second tube through the first liquid inlet.

[0024] The colorimetric solution is introduced into the first tube and the second tube through the first liquid inlet.

[0025] Real-time detection of air bubbles in the colorimetric solution during extraction and introduction;

[0026] Perform optical signal detection.

[0027] The beneficial effects of the colorimetric tube, water quality testing device, and method of use provided in this application are as follows:

[0028] The colorimetric tube provided in this embodiment has a diffuse reflection layer in the first tube body. The diffuse reflection layer is configured to diffusely reflect light into the first tube body. In this way, when the light emitted by the light emitting module enters the first tube body from the first interface, part of the light passes directly through the diffuse reflection layer for diffuse reflection, and the other part of the light is scattered by turbidity particles and then passes through the diffuse reflection layer for diffuse reflection. This makes the light intensity of the entire inner surface of the first tube body basically the same, which is beneficial for the light receiving module to receive the light signal from the second interface. The colorimetric tube provided in this embodiment has the effect of resisting turbidity interference when detecting light signals, without the need for additional turbidity compensation operation, which helps to improve the accuracy of water quality detection results.

[0029] Accordingly, the water quality testing device provided in this application embodiment also has the advantages of anti-turbidity interference effect and high accuracy of water quality testing results.

[0030] Accordingly, the water quality testing method provided in this application has the advantages of anti-turbidity interference and high accuracy of detection results due to the use of the above-mentioned colorimetric tube. On the other hand, before optical signal detection, the colorimetric solution is first drawn out of the first tube and the second tube through the first liquid inlet, and then introduced into the first tube and the second tube through the first liquid inlet. The air bubbles in the colorimetric solution are detected in real time. This helps to remove air bubbles in the colorimetric solution, thereby solving the influence of air bubbles on the accuracy of optical signal detection, and thus helping to maintain the accuracy and stability of water quality testing results. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the water quality testing device provided in the embodiments of this application;

[0033] Figure 2 A three-dimensional schematic diagram of the colorimetric tube provided in an embodiment of this application;

[0034] Figure 3 for Figure 2 A cross-sectional view of the provided colorimetric tube from a first-view perspective;

[0035] Figure 4 for Figure 3 The provided optical path diagram for colorimetric tubes used with turbidity particles;

[0036] Figure 5 for Figure 2 A cross-sectional view of the provided colorimetric tube from a second perspective;

[0037] Figure 6 A flowchart of a water quality testing method provided in an embodiment of this application.

[0038] The following are the labeling elements in the figure:

[0039] 100 - Colorimetric unit; 200 - Digestion unit; 300 - Sampling unit; 310 - Aspiration module; 320 - Metering module; 330 - Valve module; 400 - Bubble detector; 500 - First infusion tube; 600 - Second infusion tube; 10 - Colorimetric tube; 101 - First interface; 102 - Second interface; 103 - First liquid inlet; 104 - Second liquid inlet; 105 - First cavity; 106 - Third liquid inlet; 107 - Fourth liquid inlet; 108 - Second cavity; 11 - First tube body; 12 - Diffuse reflection layer; 13 - Light blocking layer; 14 - Second tube body; 15 - Transition tube; 16 - First extension tube; 17 - Second extension tube; b - First radial direction; c - Second radial direction. Detailed Implementation

[0040] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0041] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified, where two or more includes two.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] The following detailed description is provided in conjunction with specific accompanying drawings and embodiments:

[0045] Please see Figure 1 The first aspect of this application provides a water quality testing device, which includes a digestion unit 200 and a colorimetric unit 100. The colorimetric unit 100 includes a colorimetric tube 10 and a light signal detection device. The light signal detection device includes a light emitting module and a light receiving module, both of which are disposed within the colorimetric tube 10. It should be noted that the water quality testing steps can be as follows: first, the water sample to be tested is passed into the digestion unit 200 for a digestion reaction to obtain a digested solution; then, the digested solution is passed into the colorimetric tube 10 for a colorimetric reaction to obtain a colorimetric solution; finally, light signal detection is performed. Specifically, the light emitting module passes light of a specific wavelength into the colorimetric tube 10, i.e., into the colorimetric solution; the light receiving module receives the light passing through the colorimetric solution to transmit the corresponding light signal to an external processing unit. The processing unit obtains the light intensity of the light passing through the colorimetric solution through the light signal and calculates the absorbance of the colorimetric solution, thereby obtaining the concentration of the analyte in the water sample. The absorbance of the water sample to be tested is directly proportional to the concentration of the measured factor.

[0046] The measured factors can be phosphorus, iron, ammonia nitrogen, etc. In other words, the water quality testing device can be used to detect total phosphorus, as well as iron, ammonia nitrogen, and other contents.

[0047] Optionally, the water quality testing device also includes a sampling unit 300, which is connected to the digestion unit 200 and the colorimetric tube 10 respectively. The sampling unit 300 is used to introduce or remove the water sample to be tested and other auxiliary solutions into or from the digestion unit 200, and to introduce or remove the water sample to be tested and auxiliary solutions into the colorimetric tube 10. For example, before the digestion reaction, the sampling unit 300 can introduce the water sample to be tested and the digestion solution into the digestion unit 200; before the colorimetric reaction, the sampling unit 300 can introduce the digestion solution, reducing agent, and colorimetric agent into the colorimetric tube 10; when cleaning the colorimetric tube 10, the sampling unit 300 can also introduce distilled water into the colorimetric tube 10. Based on this, the auxiliary solutions can be digestion solution, reducing agent, colorimetric agent, and distilled water, etc., which can be selected according to the actual reaction requirements, and will not be elaborated or limited here.

[0048] For details regarding the specific steps and related structures of operations such as digestion reaction, colorimetric reaction, and optical signal detection, please refer to the description of water quality testing methods below; they will not be repeated here.

[0049] Please refer to the following: Figure 2 and Figure 3 The second aspect of this application provides a colorimetric tube 10. Specifically, the colorimetric tube 10 has a first interface 101 and a second interface 102. The first interface 101 is used to assemble a light emitting module, and the second interface 102 is used to assemble a light receiving module. The colorimetric tube 10 includes a first tube body 11 and a diffuse reflection layer 12. The first tube body 11 has a first liquid inlet 103 and a second liquid inlet 104 disposed opposite to each other. The diffuse reflection layer 12 is disposed on the first tube body 11 and is configured to diffusely reflect light into the first tube body 11. The first interface 101 and the second interface 102 are both opened in the first tube body 11 and / or the diffuse reflection layer 12, and are both located between the first liquid inlet 103 and the second liquid inlet 104.

[0050] The first tube 11 has a first cavity 105 for the solution, and both the first liquid inlet 103 and the second liquid inlet 104 are connected to the first cavity 105. Furthermore, passing light into the colorimetric solution also refers to passing light into the first cavity 105. The solution here can be the water sample to be tested, an auxiliary solution, a digestion solution, or a colorimetric solution.

[0051] It should be noted that the diffuse reflection layer 12 is disposed on the surface of the first tube 11. This surface can be either the inner or outer wall of the first tube 11, meaning the diffuse reflection layer 12 is disposed on either the inner or outer wall of the first tube 11. Specifically, the diffuse reflection layer 12 can be a microstructure formed on the surface of the first tube 11 through processes such as frosting or laser processing, meaning the diffuse reflection layer 12 and the first tube 11 are an integrally formed structure. Alternatively, it can be a diffuse reflection coating sprayed onto the surface of the first tube 11, or even a diffuse reflection sheet attached to the surface of the first tube 11, meaning the diffuse reflection layer 12 and the first tube 11 are separate connected structures. Here, it is sufficient that the diffuse reflection layer 12 can achieve a diffuse reflection effect of light passing through the colorimetric solution. The diffuse reflection sheet can be composed of submicron and nano-diffuse reflective particles, or it can be a microstructure formed on the surface of the reflective sheet to achieve a diffuse reflection effect.

[0052] It should also be noted that the first interface 101 can be located in the first tube 11 or in the diffuse reflection layer 12, or even in both the first tube 11 and the diffuse reflection layer 12. Correspondingly, the second interface 102 can be located in the first tube 11 or in the diffuse reflection layer 12, or even in both the first tube 11 and the diffuse reflection layer 12.

[0053] It should also be noted that the first interface 101 and the second interface 102 are both located between the first liquid inlet 103 and the second liquid inlet 104, and the first liquid inlet 103 and the second liquid inlet 104 are arranged opposite to each other. In this way, the problem of light emitted from the light emitting module from the first interface 101 overflowing the first liquid inlet 103 or the second liquid inlet 104 without causing diffuse reflection can be mitigated.

[0054] The first liquid inlet 103 and the second liquid inlet 104 are both used to pass a solution, which can be a digestion solution, a colorimetric solution, etc.

[0055] The colorimetric tube 10 provided in this embodiment has a first tube body 11 with a diffuse reflection layer 12. The diffuse reflection layer 12 is configured to diffusely reflect light into the first tube body 11. Thus, when light emitted by the light emitting module enters the first tube body 11 from the first interface 101, a portion of the light passes directly through the diffuse reflection layer 12 and undergoes diffuse reflection, while another portion passes through turbidity particles and is scattered, then passes through the diffuse reflection layer 12 and undergoes diffuse reflection again. Specifically, as shown... Figure 4 As shown, the light is as Figure 4 The 'm' symbol represents turbidity particles, as shown in the diagram. Figure 4 As illustrated in diagram a, this design ensures that the light intensity across the entire surface of the first tube 11 is essentially uniform, resulting in a consistent light intensity across the entire surface. This improves the accuracy of the light intensity acquired by the light receiving module, mitigating the impact of turbidity particles on the accuracy of the light signal detection results. Furthermore, the light within the first tube 11 undergoes diffuse reflection, promoting uniform light distribution and facilitating the light receiving module's reception of the light signal from the second interface 102. Therefore, the colorimetric tube 10 provided in this embodiment exhibits anti-turbidity interference during light signal detection, effectively eliminating the influence of turbidity particles on the detection results without requiring additional turbidity compensation, thereby improving the accuracy of water quality detection results. Accordingly, the water quality detection device provided in this application, employing the aforementioned colorimetric tube 10, also possesses the advantages of anti-turbidity interference and high accuracy in water quality detection results.

[0056] It's important to note that in traditional methods, turbidity particles in the water sample scatter light during transmission, altering light intensity and absorbance. This results in an increase in the concentration of the analyte in the water sample. Consequently, some water quality testing devices with filtration functions have emerged. These typically perform filtration during the pretreatment of the water sample, before the digestion reaction. However, this can easily lead to over-filtration, which lowers the concentration of the analyte and consequently reduces the accuracy of the water quality test results. For water samples with low concentrations of the analyte, the proportion of deviations in the detection data, whether due to turbidity particles or excessive filtration, is very large, resulting in significant deviations in the detection results and making it difficult to guarantee accuracy. Conversely, for water samples with high concentrations of the analyte, the proportion of deviations in the detection data, whether due to turbidity particles or excessive filtration, is not particularly large, and the impact is smaller compared to water samples with low concentrations, but it still has some influence on the detection results. In this embodiment, the diffuse reflection layer 12 achieves uniform light intensity on the surface of the first tube 11, realizing the effect of resisting turbidity interference and eliminating the need for additional turbidity compensation. This eliminates the possibility of detection result deviations caused by excessive filtration. Therefore, the colorimetric tube 10 and the water quality detection device using the colorimetric tube 10 provided in this embodiment are applicable not only to water quality detection of high-concentration samples but also to water quality detection of low-concentration samples.

[0057] Among them, the water samples to be tested with low concentration can be Class I or II surface water and Class I, II, III or IV lake and reservoir water, etc.; the turbidity particles can be suspended particles such as silt, aquatic plants, etc.

[0058] Commercially available water quality testing devices with filtration functions can also filter the water sample after the digestion reaction. This filtration process has little impact on the water quality test results, but it requires a filter port in the colorimetric tube 10 or digestion unit 200 to filter the water sample after the digestion reaction. This filter port increases the maintenance difficulty of the digestion unit 200 or colorimetric tube 10, potentially reducing their lifespan. In this embodiment, however, the diffuse reflection layer 12 achieves uniform light intensity on the surface of the first tube 11, effectively resisting turbidity interference. This eliminates the need for a filter port, which not only improves the maintenance and lifespan of the colorimetric tube 10 and digestion unit 200 but also reduces the number of steps in water quality testing, simplifying the operation.

[0059] It should be noted that, due to the influence of turbidity particles on water quality test results, some water quality testing devices with turbidity compensation have appeared on the market. This compensation function is effective for water samples with high concentrations of the measured factor, but for water samples with low concentrations of the measured factor, the turbidity compensation effect is not obvious, that is, it is difficult to reduce the interference of turbidity particles on the test results. The water quality testing device in this embodiment can be used for water quality testing of water samples with low concentrations to achieve the effect of resisting turbidity interference.

[0060] In one embodiment, please refer to [the relevant documentation / reference]. Figure 3 and Figure 4 A diffuse reflection layer 12 is disposed on the outer wall of the first tube 11, and a light-blocking layer 13 is disposed on the other side of the diffuse reflection layer 12 opposite to the first tube 11. The first tube 11 is a light-transmitting structure. Specifically, when the light emitting module emits light from the first interface 101 into the first tube 11, the light inside the first tube 11 (including the light emitted directly by the light emitting module and the light scattered by turbidity particles) first passes through the light-transmitting first tube 11 to achieve diffuse reflection under the action of the diffuse reflection layer 12, and then continues to pass through the first tube 11 to enter the first tube 11 again. This makes the light uniformly distributed on the surface of the first tube 11, that is, to achieve the effect of uniform light intensity distribution. In addition, the setting of the light-blocking layer 13 makes the colorimetric tube 10 have good light-blocking properties, thereby preventing external light from entering the first tube 11, reducing the influence of external light on the water quality test results, and thus improving the accuracy of the water quality test results. Based on this, the first interface 101 is simultaneously formed in the diffuse reflection layer 12 and the light blocking layer 13, that is, the first interface 101 penetrates through the diffuse reflection layer 12 and the light blocking layer 13. At this time, the first interface 101 can also be simultaneously formed in the first tube body 11, or not formed in the first tube body 11. Correspondingly, the second interface 102 is simultaneously formed in the diffuse reflection layer 12 and the light blocking layer 13, that is, the second interface 102 penetrates through the diffuse reflection layer 12 and the light blocking layer 13. At this time, the second interface 102 can also be simultaneously formed in the first tube body 11, or not formed in the first tube body 11.

[0061] Alternatively, in other embodiments, the diffuse reflection layer 12 is not disposed on the outer wall of the first tube 11, but on the inner wall of the first tube 11, and the first tube 11 is an opaque structure. The diffuse reflection layer 12 has a light-transmitting protective layer (not shown) on the other side of the first tube 11. Specifically, light inside the first tube 11 can be diffusely reflected directly by the diffuse reflection layer 12 without passing through the first tube 11. Since the first tube 11 is opaque, the colorimetric tube 10 can block light from escaping from the first tube 11 to the outside, thus providing good light-blocking performance. Based on this, the first interface 101 is simultaneously located in both the diffuse reflection layer 12 and the first tube 11, meaning the first interface 101 penetrates both the diffuse reflection layer 12 and the first tube 11.

[0062] Alternatively, in other embodiments, the diffuse reflection layer 12 is not disposed on the outer wall of the first tube 11, but on the inner wall of the first tube 11, and a light-blocking layer 13 is disposed between the inner wall of the first tube 11 and the diffuse reflection layer 12. A light-transmitting protective layer (not shown) is disposed on the other side of the diffuse reflection layer 12 relative to the first tube 11. Specifically, the light inside the first tube 11 can be diffusely reflected directly by the diffuse reflection layer 12 without passing through the first tube 11. In this case, the first tube 11 can be a light-transmitting structure or an opaque structure. When the first tube 11 is a light-transmitting structure, the light-blocking effect of the colorimetric tube 10 can be achieved through the light-blocking layer 13. When the first tube 11 is an opaque structure, the light-blocking effect of the colorimetric tube 10 can be achieved simultaneously through both the first tube 11 and the light-blocking layer 13.

[0063] The light-blocking layer 13 can be a black electroplated layer or a light-blocking sheet, depending on the actual usage requirements, as long as the light-blocking layer 13 can block light.

[0064] The above-mentioned light-transmitting protective layer can protect the diffuse reflection layer 12, prevent the water sample to be tested and the auxiliary solution from corroding the diffuse reflection layer 12 and the light-blocking layer 13, and thus facilitate the smooth operation of water quality testing. Optionally, the protective layer can be made of the material of the first tube 11 with the light-transmitting structure mentioned above.

[0065] In one embodiment, please refer to [the relevant documentation / reference]. Figures 2 to 4 The first tube 11 is spherical. Correspondingly, since the diffuse reflection layer 12 is arranged in contact with the surface of the first tube 11, the surface of the diffuse reflection layer 12 is also spherical. With this arrangement, under the diffuse reflection effect of the spherical diffuse reflection layer 12, it helps to further improve the uniformity of light distribution on the surface of the first tube 11, thereby improving the uniformity of light intensity on the surface of the first tube 11 and thus helping to improve the accuracy of water quality test results.

[0066] In one embodiment, please refer to [the relevant documentation / reference]. Figure 2 and Figure 5 The first interface 101 has a diffusion range for the light emitted by the light-emitting module. Understandably, when the light-emitting module transmits light from the first interface 101 into the first tube 11, the light beam has a certain diffusion angle, thus giving the light beam a certain coverage area. The coverage area formed by this diffusion angle is the aforementioned diffusion range, which is as follows: Figure 5 The range n is shown in the diagram.

[0067] It should be noted that in traditional schemes, the light emitting module and the light receiving module are distributed on opposite sides of the colorimetric tube 10, that is, the light emitting module and the light receiving module are distributed along a straight line, and this straight line passes through the center point of the colorimetric tube 10. This allows the light emitting module to emit light to the light receiving module along a straight line. In this case, part of the light emitted by the light emitting module can be directly received by the light receiving module, while the other part is received by the light receiving module after being scattered by turbidity particles. Since the light intensity of the part of light not scattered by turbidity particles is different from the light intensity of the part of light scattered by turbidity particles, the light receiving module will receive light of varying intensity. This leads to inconsistent absorbance calculations of the water sample, resulting in inaccurate data and thus inaccurate water quality test results. Figure 5 As shown, in this embodiment, the second interface 102 is located outside the diffusion range. This mitigates the problem that light emitted by the light-emitting module from the first interface 101 into the first tube 11 is directly received by the light-receiving module without passing through the diffuse reflection layer 12. Thus, of the light emitted by the light-emitting module from the first interface 101 into the first tube 11, part of the light passes directly through the diffuse reflection layer 12, while the other part passes through the diffuse reflection layer 12 again due to the scattering effect of turbidity particles. This helps maintain the uniformity of light intensity on the surface of the first tube 11. In other words, the light emitted by the light-emitting module is diffusely reflected before being received by the light-receiving module, which helps improve the accuracy of the light intensity received by the light-receiving module, thereby improving the accuracy of the water quality detection results.

[0068] For example, such as Figure 5 As shown, the first tube 11 is a spherical body with a first radial direction b and a second radial direction c. The first radial direction b passes through the center of the first tube 11 and the first interface 101. The second radial direction c passes through the center of the first tube 11 and the second interface 102. The first radial direction b and the second radial direction c form an included angle β. The angle β can be selected as 90°, or it can be an acute angle or an obtuse angle, as long as the included angle satisfies that the second interface 102 is located outside the above-mentioned diffusion range.

[0069] In one embodiment, please refer to [the relevant documentation / reference]. Figures 2 to 5 The first interface 101 and the second interface 102 are both located at the midpoint between the first liquid inlet 103 and the second liquid inlet 104. Understandably, the first tube body 11 is a spherical body with a radial plane that passes through the center of the sphere and is perpendicular to the distribution direction of the first liquid inlet 103 and the second liquid inlet 104, specifically as follows... Figure 5 The plane in which it is located, that is Figure 5 The plane formed in the upper, lower, left, and right directions, and this radial plane also passes through the first interface 101 and the second interface 102; it can also be understood that the first liquid inlet 103 and the second liquid inlet 104 are symmetrical with respect to the first radial b-axis and also symmetrical with respect to the second radial c-axis; for example, as Figure 3 and Figure 4 As shown, the first liquid inlet 103 and the second liquid inlet 104 are distributed in the vertical direction, with the first interface 101 and the second interface 102 located in the middle of the vertical direction. This arrangement allows the light emitted by the light emitting module to be emitted at the middle position between the first liquid inlet 103 and the second liquid inlet 104. On the one hand, this helps to reduce the problem of light overflowing through the first liquid inlet 103 or the second liquid inlet 104 before diffuse reflection; on the other hand, it helps the diffuse reflection layer 12 to receive the light evenly and achieve diffuse reflection, thereby improving the uniformity of light intensity on the surface of the first tube 11 and improving the accuracy of water quality detection results. Furthermore, it also allows the light receiving module to receive light at the middle position between the first liquid inlet 103 and the second liquid inlet 104, which helps the light receiving module to stably receive the light signal, further improving the accuracy of water quality detection.

[0070] In one embodiment, please refer to [the relevant documentation / reference]. Figures 2 to 4 The colorimetric tube 10 also includes a second tube body 14, which has a third liquid inlet 106 and a fourth liquid inlet 107. The second tube body 14 is disposed within the first tube body 11, and the second liquid inlet 104 and the third liquid inlet 106 are connected. With this configuration, in use, the colorimetric solution in the colorimetric tube 10 can fill the first tube body 11 and at least partially be contained in the second tube body 14. Thus, the second tube body 14 can achieve a buffering effect, allowing the colorimetric solution to still fill the first tube body 11 even after air bubbles are removed. This helps ensure that all light emitted by the light-emitting module can pass through the colorimetric solution, thereby improving the accuracy of water quality testing results.

[0071] Specifically, such as Figures 2 to 4 As shown, the distribution directions of the third liquid inlet 106 and the fourth liquid inlet 107 are the same as those of the first liquid inlet 103 and the second liquid inlet 104.

[0072] Specifically, such as Figure 3 As shown, the second tube 14 has a second cavity 108, and a third liquid inlet 106 and a fourth liquid inlet 107 are respectively connected to the second cavity 108. The second cavity 108 is used to contain the solution.

[0073] Optionally, such as Figures 2 to 4 As shown, the second tube 14 is also spherical, which helps to improve the stability of the solution entering or leaving the colorimetric tube 10. The solution here can be any solution that needs to be introduced into the colorimetric tube 10, such as the water sample to be tested, or an auxiliary solution, digestion solution, colorimetric solution, etc. Of course, depending on the actual design requirements, the second tube 14 can also be square, cylindrical, or other shapes.

[0074] In one embodiment, please refer to [the relevant documentation / reference]. Figures 2 to 4 A transition pipe 15 is provided between the second pipe body 14 and the first pipe body 11. The two ends of the transition pipe 15 are respectively connected to the second liquid inlet 104 and the third liquid inlet 106. That is, the second liquid inlet 104 and the third liquid inlet 106 are indirectly connected through the transition section. In this embodiment, the transition pipe 15 serves two purposes. First, it enables the connection and transition between the first pipe body 11 and the second pipe body 14. Furthermore, by using a smaller diameter transition pipe 15, compared to a direct connection between the second pipe body 14 and the first pipe body 11, the problem of external light entering the first pipe body 11 through the second liquid inlet 104 is mitigated, thus improving the accuracy of water quality testing. Second, it facilitates the production of the colorimetric tube 10.

[0075] Optionally, such as Figure 3 and Figure 4 As shown, the diffuse reflection layer 12 and the light blocking layer 13 cover at least a portion of the transition tube 15, which helps to further mitigate the problem of external light entering the first tube 11.

[0076] In one embodiment, both the second tube 14 and the transition tube 15 are transparent. This configuration allows for observation of the liquid level and mass (including the air bubbles within the solution) of the colorimetric solution during water quality testing via the transition tube 15 and the second tube 14, thus facilitating stable and accurate water quality testing.

[0077] Optionally, such as Figure 1 As shown, the colorimetric tube 10 also includes a first extension tube 16, which is disposed at the first liquid inlet 103. The first extension tube 16 can be used to connect to the first liquid delivery tube 500 of the water quality testing device, which facilitates the solution to enter the colorimetric tube 10. The diffuse reflection layer 12 and the light blocking layer 13 both cover the first extension tube 16, which helps to reduce the problem of external light entering the first tube body 11.

[0078] Optionally, such as Figure 1 As shown, the colorimetric tube 10 also includes a second extension tube 17, which is disposed at the fourth liquid inlet 107 and is disposed at opposite ends of the colorimetric tube 10, along with the first extension tube 16. In use, the second extension tube 17 can be exposed to the outside, that is, it is connected to the outside, which helps to achieve the pressure relief effect of the colorimetric tube 10, thereby improving the smoothness of water quality testing.

[0079] Please refer to the following: Figure 1 and Figure 6 The third aspect of this application provides a water quality testing method, which is implemented using a water quality testing device. The water quality testing device includes the colorimetric tube 10 described in the above embodiments. The water quality testing method includes the following steps:

[0080] S10. Pass the digested water sample to be tested into the first tube 11 to carry out a colorimetric reaction to obtain a colorimetric solution, and make the liquid level of the colorimetric solution located in the second tube 14.

[0081] It should be noted that the water quality testing device also includes a sampling unit 300, which is connected to a first infusion tube 500 and a second infusion tube 600. The other end of the first infusion tube 500 relative to the sampling unit 300 is connected to the first tube body 11 of the colorimetric tube 10, and the other end of the second infusion tube 600 relative to the sampling unit 300 is connected to the digestion unit 200.

[0082] Specifically, the sampling unit 300 includes a metering module 320, an aspiration module 310, and a valve module 330. Both the aspiration module 310 and the valve module 330 are located within the metering module 320, and the other end of the first infusion tube 500 relative to the colorimetric tube 10 and the other end of the second infusion tube 600 relative to the digestion unit 200 are connected to the valve module 330. The valve module 330 is used to open or close the first infusion tube 500 and the second infusion tube 600. The aspiration module 310 is used to aspirate the solution, and the metering module 320 can hold the solution and also measure its volume. The solution can be the water sample to be tested, or it can be an auxiliary solution, a digestion solution, a colorimetric solution, etc. Optionally, the metering module 320 can be a peristaltic pump and a metering tube combination, a plunger pump and a metering loop combination, or a syringe pump and a metering loop combination.

[0083] Before step S10, the method further includes: the sampling unit 300 delivers the water sample to be tested and the digestion solution to the digestion unit 200 through the second infusion tube 600, and the water sample to be tested and the digestion solution undergo a digestion reaction in the digestion unit 200 to obtain a digestion solution, which is the "digested water sample to be tested" mentioned above; wherein, the sampling unit 300 absorbs the water sample to be tested and the digestion solution through the aspiration module 310.

[0084] Specifically, the digestion unit 200 includes a digestion tank and a heating element disposed in the digestion tank. When the water sample to be tested and the digestion solution are placed in the digestion tank, the heating element heats the digestion tank to heat the digestion solution and the water sample to be tested, thereby realizing the digestion reaction of the water sample to be tested.

[0085] In step S10, specifically, the aspiration module 310 draws the digestion solution from the digestion unit 200 into the metering module 320 through the second infusion tube 600. Then, the digestion solution is sequentially introduced into the first tube 11 and the second tube 14 through the first infusion tube 500 and the first inlet 103. Next, the sampling unit 300 sequentially introduces a quantitative amount of reducing agent into the first tube 11 through the first infusion tube 500 and the first inlet 103, and after blowing and stirring evenly, a quantitative amount of color-developing agent is sequentially introduced into the first tube 11 through the first infusion tube 500 and the first inlet 103, and stirred by blowing. The digestion solution then undergoes a color-developing reaction for a period of time with the assistance of the reducing agent and the color-developing agent to obtain a color-developing solution. The color-developing solution fills the first tube 11, and at least a portion of the color-developing solution is contained in the second tube 14. Specifically, as follows... Figure 5 As shown. The second tube 14 is located above the first tube 11. The transparent design of the second tube 14 and the transition tube 15 allows direct observation of the liquid level of the colorimetric solution through the second tube 14; as shown. Figure 4 As shown, due to Figure 4 Since the colorimetric solution has been degassed, the liquid level in step S10 is located at... Figure 4 Above the label d shown in the diagram.

[0086] S20. The colorimetric solution is drawn out of the first tube 11 and the second tube 14 through the first liquid inlet 103.

[0087] Specifically, in this step, the aspiration module 310 draws the colorimetric solution from the first tube 11 and the second tube 14 through the first liquid inlet 103 and the first infusion tube 500, and then into the metering module 320. At this time, the air bubbles in the colorimetric solution float on the surface of the liquid at the other end of the colorimetric solution relative to the metering module 320 due to the relative flow of the colorimetric solution.

[0088] S30. The colorimetric solution is introduced into the first tube 11 and the second tube 14 through the first liquid inlet 103.

[0089] Specifically, in this step, the aspiration module 310 sequentially introduces the colorimetric solution from the metering module 320 into the first tube 11 and the second tube 14 through the first infusion tube 500 and the first inlet 103. At this time, air bubbles continue to float on the surface of the colorimetric solution at the end opposite to the metering module 320. Thus, the air bubbles filling the first tube 11 are eliminated, which helps to mitigate the impact of air bubbles on the water quality test results and improve the accuracy of the results. After the air bubbles are eliminated, the surface of the colorimetric solution is as follows: Figure 4 The label d is shown in the diagram.

[0090] It should be noted that when light is introduced into the first tube 11, if there are air bubbles in the color developing solution, the light intensity at the location of the air bubbles will be affected.

[0091] It should also be noted that in step S20, since the color developing solution is extracted from the first tube 11 and the second tube 14, the liquid level of the color developing solution at the other end of the metering module 320 is below the first tube 11. Thus, when the color developing solution is reintroduced into the first tube 11 and the second tube 14 in step S30, it helps to completely remove all air bubbles in the first tube 11.

[0092] In step S10, the liquid level of the colorimetric solution is located in the second tube 14. Thus, after the bubbles are expelled from the colorimetric solution in steps S20 and S30, the colorimetric solution can still fill the first tube 11. This allows all the light emitted by the light emitting module to pass through the colorimetric solution, thereby enabling the light signal received by the light receiving module to reflect the concentration of the measured factor in the colorimetric solution, which helps to improve the accuracy of water quality detection results.

[0093] In step S20, the speed at which the aspirating module 310 extracts the colorimetric solution is a first speed, and in step S30, the speed at which the aspirating module 310 introduces the colorimetric solution is a second speed. Optionally, the first speed can be greater than the second speed. If the first speed is greater, then when the colorimetric solution is extracted in step S20, the bubbles can float on the surface of the liquid on the side of the colorimetric solution opposite to the measuring unit. If the second speed is smaller, then when the colorimetric solution is introduced in step S30, the speed at which the colorimetric solution is introduced can be prevented from being too fast, which would cause the generation of new bubbles and the continued presence of residual bubbles in the colorimetric solution. This helps to improve the bubble removal effect.

[0094] S40. Real-time detection of air bubbles in the colorimetric solution during extraction and introduction;

[0095] Specifically, such as Figure 1As shown, the water quality testing device also includes a bubble detector 400, which is installed in the first infusion tube 500. During the process of the aspiration module 310 introducing or removing the colorimetric solution into the first tube 11 and the second tube 14, the colorimetric solution passes through the bubble detector 400, allowing it to detect the presence of bubbles in the solution. In step S30, during the process of the colorimetric solution being introduced from the metering module 320 into the first tube 11, the bubbles are primarily located on the surface of the solution, not within it. Therefore, the bubble detector 400 will not detect the bubbles, and the colorimetric solution filling the first tube 11 is essentially bubble-free. The bubble detector 400 can then emit a signal indicating the absence of bubbles in the solution, followed by optical signal detection. This helps to address the problem of inaccurate water quality test results caused by bubbles and improves the accuracy of the water quality test results.

[0096] S50, perform optical signal detection.

[0097] Specifically, the light emitting module emits light into the first tube 11 through the first interface 101. Part of the light passes directly through the diffuse reflection layer 12 and undergoes diffuse reflection, while the other part passes through turbidity particles and is scattered, then passes through the diffuse reflection layer 12 and undergoes diffuse reflection. At this time, the light receiving module receives the diffusely reflected light and sends the light signal to the external processing unit. The processing unit obtains the absorbance of the colorimetric solution through the light signal and then calculates the concentration of the analyte in the water sample, thus realizing water quality detection.

[0098] Based on this, the water quality detection method provided in this application embodiment has the advantages of anti-turbidity interference effect and high detection accuracy due to the use of the colorimetric tube 10. On the other hand, before optical signal detection, the colorimetric solution is first drawn out of the first tube 11 and the second tube 14 through the first liquid inlet 103, and then introduced into the first tube 11 and the second tube 14 through the first liquid inlet 103. The bubbles in the colorimetric solution are detected in real time. This helps to remove the bubbles in the colorimetric solution, thereby solving the influence of bubbles on the accuracy of optical signal detection, so as to help maintain the accuracy and stability of water quality detection results.

[0099] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cuvette having a first interface for fitting a light emitting module and a second interface for fitting a light receiving module; characterized in that, The cuvette comprises: a first tube body having a first liquid inlet and a second liquid inlet arranged oppositely; a diffuse reflection layer arranged on the first tube body and configured to diffuse light into the first tube body; the first interface and the second interface are both arranged on the first tube body and / or the diffuse reflection layer and are both located between the first liquid inlet and the second liquid inlet; the first tube body is a spherical body; the cuvette further comprises a second tube body having a third liquid inlet and a fourth liquid inlet arranged oppositely, the second tube body is arranged on the first tube body, and the second liquid inlet and the third liquid inlet are communicated; the second tube body is a spherical body; a transition tube is arranged between the second tube body and the first tube body, and opposite ends of the transition tube are communicated with the second liquid inlet and the third liquid inlet, respectively; the distribution directions of the third liquid inlet and the fourth liquid inlet are the same as those of the first liquid inlet and the second liquid inlet; the first tube body has a first cavity for containing a solution, and the first liquid inlet and the second liquid inlet are both communicated with the first cavity; the second tube body has a second cavity, and the third liquid inlet and the fourth liquid inlet are both communicated with the second cavity, and the second cavity is used for containing a solution.

2. The cuvette of claim 1, wherein The diffuse reflection layer is arranged on the outer wall of the first tube body, and the diffuse reflection layer is arranged with a light-blocking layer on the other side of the first tube body, and the first tube body is a light-transmitting structure; or, the diffuse reflection layer is arranged on the inner wall of the first tube body, and the first tube body is a non-light-transmitting structure, and the diffuse reflection layer is arranged with a light-transmitting protective layer on the other side of the first tube body; or, the diffuse reflection layer is arranged on the inner wall of the first tube body, and a light-blocking layer is arranged between the inner wall of the first tube body and the diffuse reflection layer, and the diffuse reflection layer is arranged with a light-transmitting protective layer on the other side of the first tube body.

3. The cuvette of claim 1, wherein The first interface has a diffusion range for light diffusion of the light emitting module, and the second interface is located outside the diffusion range.

4. The cuvette of claim 1, wherein The first interface and the second interface are both located at the middle positions of the first liquid inlet and the second liquid inlet.

5. The cuvette according to any one of claims 1 to 4, characterized in that The second tube body and the transition tube are both transparent structures.

6. A water quality detection device, characterized by, It comprises: a digestion unit; a colorimetric unit comprising the cuvette according to any one of claims 1-5, a light emitting module arranged at the first interface, and a light receiving module arranged at the second interface.

7. A water quality detection method, which is realized by using a water quality detection device, characterized in that, The water quality detection device comprises the cuvette according to any one of claims 1-5, and the water quality detection method comprises the following steps: passing the digested water sample to be tested into the first tube body for color development reaction to obtain a color development solution, and locating the liquid surface of the color development solution in the second tube body; extracting the color development solution from the first tube body and the second tube body through the first liquid inlet; passing the color development solution into the first tube body and the second tube body through the first liquid inlet; real-time detecting bubbles in the color development solution during the extraction and passing-in processes; performing light signal detection.

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