Integrated full-scene adaptive total phosphorus rapid detection platform

Abstract

The utility model relates to an integrated full-scene adaptive total phosphorus rapid detection platform, which comprises a raw water collection module, a sample digestion module, a sample introduction reaction module and a detection module, the raw water collection module comprises an automatic sample injector capable of automatically switching a plurality of sample tubes and / or online water samples to collect raw water; the sample digestion module comprises sulfuric acid mixed with a sample, a heating reactor, potassium persulfate mixed with a mixed solution and an ultraviolet digestion device, and the sample introduction reaction module comprises a color developing agent mixed with the sample subjected to ultraviolet digestion, ascorbic acid mixed with the mixed solution and a heating reactor. The detection module comprises a flow cell of a final reaction product and a detector, and a plurality of modules of raw water collection, sample digestion, sample introduction reaction, detection and the like are integrated into a whole, so that full-process automatic operation from raw water collection to final detection result output is realized.

Description

Technical Field

[0001] This application relates to the field of water quality testing technology, specifically to the field of integrated, all-scenario adaptable rapid total phosphorus testing platform technology. Background Technology

[0002] In the field of environmental monitoring, the determination of total phosphorus content is crucial for assessing water quality, as phosphorus is one of the main factors leading to eutrophication. The ammonium molybdate spectrophotometric method, as a classic and widely accepted approach, is commonly used for total phosphorus detection. However, the traditional ammonium molybdate spectrophotometric method typically requires complex sample pretreatment steps, which is not only time-consuming but also limits its application in rapid on-site detection. Furthermore, this method demands a high level of operator skill and is susceptible to human error, affecting the accuracy of the results.

[0003] Meanwhile, current testing equipment on the market either focuses on high-precision measurements in laboratory environments or concentrates on online monitoring in specific scenarios, making it difficult to achieve full-scenario adaptability that is compatible with both offline and online applications. Therefore, there is a lack of comprehensive solutions that can flexibly adapt to the needs of different application scenarios while ensuring both testing speed and accuracy. Summary of the Invention

[0004] To address the aforementioned issues, this application proposes an integrated, all-scenario adaptable rapid total phosphorus detection platform. Utilizing the principle of flow injection analysis (FIA) and combining it with optimizations to the ammonium molybdate spectrophotometric method, this platform overcomes the limitations of existing technologies and provides users with more convenient and efficient total phosphorus detection services.

[0005] To achieve the above objectives, the present application adopts the following technical solution:

[0006] This application provides an integrated, all-scenario adaptable rapid detection platform for total phosphorus, including a raw water collection module, a sample digestion module, a sample injection reaction module, and a detection module;

[0007] The raw water collection module includes an automatic sampler capable of automatically switching between multiple sample tubes and / or online water samples to collect raw water, as well as a peristaltic pump.

[0008] The sample digestion module includes sulfuric acid mixed with the sample delivered by the raw water collection module through a three-way valve, a peristaltic pump for pumping the sulfuric acid, and a heating reactor for the mixture; potassium persulfate mixed with the mixture delivered by the heating reactor, a peristaltic pump for pumping the potassium persulfate, and an ultraviolet digestion device for the mixture.

[0009] The sample injection reaction module includes a colorimetric reagent for mixing the sample after UV digestion, ascorbic acid for mixing the sample and the colorimetric reagent, a peristaltic pump for pumping the colorimetric reagent and ascorbic acid, and a heating reactor for the mixture.

[0010] The detection module includes a flow cell for the final reaction product and a detector.

[0011] The integrated, all-scenario adaptable rapid total phosphorus detection platform provided in this application integrates multiple modules such as raw water collection, sample digestion, sample injection reaction and detection, realizing fully automated operation from raw water collection to final detection result output.

[0012] Furthermore, the entire process requires no manual intervention, significantly shortening analysis time and reducing operational complexity. This makes the platform suitable not only for detailed analysis in laboratory environments but also for rapid detection needs in field or industrial settings. It boasts significant advantages such as ease of operation, high detection speed, and high accuracy, providing a completely new solution for total phosphorus detection.

[0013] The autosampler can intelligently switch between multiple sample tubes and online water samples, greatly improving the flexibility and efficiency of raw water treatment. The sample digestion module adopts a dual digestion method combining sulfuric acid and potassium persulfate, supplemented by a heated reactor and ultraviolet digestion device, which effectively improves digestion efficiency and thoroughness, ensuring the accuracy of subsequent test results.

[0014] At the same time, there is no need to add air bubbles or reach a physical mixing and chemical reaction equilibrium state between samples or between samples and reagents, so that repeated measurements can be performed, achieving rapid and accurate analysis.

[0015] In some possible implementations, the raw water acquisition module further includes a multi-turnable sampling valve and a sampling ring for pumping raw water using a stable peristaltic pump.

[0016] In some possible implementations, the raw water collection module further includes a flow carrier tank that carries the flow via a peristaltic pump. The flow carried by the flow carrier tank is pumped to a sampling valve and pushes the raw water in the sampling loop to the sample digestion module.

[0017] In some possible implementations, the sampling valve is provided with a waste liquid discharge port.

[0018] In some possible implementations, the number of peristaltic pumps is one, and the raw water collection module, sample digestion module, and sample injection reaction module all use the same peristaltic pump.

[0019] In some possible implementations, a surrounding reactor is also included, located at the rear end after mixing with potassium persulfate and after mixing with the color developer.

[0020] In some possible implementations, the raw water collection module may also include a cooling device that controls the raw water temperature of the sample tube and / or autosampler. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the integrated, all-scenario adaptable rapid total phosphorus detection platform of this application;

[0022] Figure 2 This is a schematic diagram of the detection and analysis process of the integrated, all-scenario adaptable rapid total phosphorus detection platform of this application. Detailed Implementation

[0023] The following examples further illustrate the features of this application and other related features in detail, so as to facilitate understanding by those skilled in the art:

[0024] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions in the attached diagrams, while the terms “bottom surface,” “top surface,” “inner,” and “outer” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0025] Furthermore, 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this case based on the specific circumstances.

[0026] This application aims to combine the advantages of flow injection analysis (FIA) technology and ammonium molybdate spectrophotometry to achieve highly sensitive, rapid, and accurate quantitative analysis of phosphorus. Furthermore, by integrating FIA technology with raw water sampling technology, it enables online and offline raw water sampling adaptable to various scenarios. Simultaneously, it improves the process from raw water to reactant sample preparation, achieving fully automated, streamlined, and rapid detection and analysis.

[0027] The main principle of the ammonium molybdate spectrophotometric method is that total phosphorus is converted into orthophosphate form under the action of potassium persulfate oxidant. Then, in an acidic medium, the orthophosphate reacts with ammonium molybdate to form phosphomolybdate yellow, which is then reduced to phosphomolybdate blue with ascorbic acid. The phosphorus concentration is determined by measuring its absorbance at a specific wavelength. The following is a detailed explanation of the overall automated production line steps.

[0028] Please refer to Figure 1 Overall, the integrated, all-scenario adaptable rapid total phosphorus detection platform of this application includes a raw water collection module, a sample digestion module, a sample injection reaction module, and a detection module.

[0029] First, the raw water acquisition module includes an autosampler, which automatically extracts raw water from multiple water sources or sample tubes and delivers it to the next step of the analysis platform. The delivery method can employ a peristaltic pump, which propels the fluid by squeezing a tubing rather than directly contacting the liquid, thus avoiding contamination and ensuring the accuracy of high-purity chemical analysis. Furthermore, the flow rate can be easily adjusted by changing the rotation speed, helping to maintain the consistency and reproducibility of experimental conditions.

[0030] Furthermore, the autosampler can use a syringe to switch between multiple sample tubes or online water samples. The switching method can be achieved through rotation or movement, which is a common industry technique and is not specifically limited thereto.

[0031] During raw water sampling, there are requirements for continuity and stability. To address this, the raw water sampling module of this application includes a multi-port rotating sampling valve and a sampling loop for the raw water pumped by a stable peristaltic pump. The sampling loop can utilize a long-distance delivery pipeline, enabling continuous automatic injection of raw water while buffering the entire raw water sampling process, making the sampling smoother, adjusting the flow rate, ensuring sample representativeness, and ensuring accurate sample extraction and introduction. Furthermore, it primarily achieves homogenization and stability of the raw water flow through natural flow. Specifically, the multi-port rotating feature of the sampling valve can be used for switching.

[0032] The sample is then pumped through the multi-port rotation of the sampling valve, and the sample from the sampling loop is propelled to the sample digestion module using this carrier fluid. This method helps ensure precise control of sample volume and avoids cross-contamination between samples. The carrier fluid is provided by a separate carrier tank, with a peristaltic pump between the carrier tank and the sampling valve. The carrier fluid can be either deionized water or ultrapure water. After the sample from the sampling loop is propelled by the carrier fluid, the next round of sample collection can be performed continuously.

[0033] In this way, the autosampler can intelligently switch between multiple sample tubes and online water samples, greatly improving the flexibility and efficiency of raw water treatment. Meanwhile, its sampling valve is equipped with a waste liquid discharge port, which allows residual waste liquid from the raw water collection stage to be discharged into a waste liquid bottle through waste discharge channel 1.

[0034] As mentioned above, this application is a scenario-adaptive detection platform capable of switching raw water samples, and therefore environmental errors may occur during the sampling process. To address this, the raw water collection module of this application also includes a cooling device to control the raw water temperature of the sample tube and the autosampler. Specifically, a built-in refrigerator can be used, which can simultaneously or individually adjust the temperature of the sample tube or the autosampler.

[0035] In some embodiments, after the raw water is collected and propelled using a carrier flow, it passes through a pressure controller. The function of the pressure controller here is to further homogenize the raw water sample by causing it to circulate over a long distance, ensuring uniform pressure and stable flow to the next step.

[0036] As this application describes a fully adaptable testing platform capable of switching between raw water samples, pretreatment of the raw water is necessary. The functional configuration of the pressure controller can be adjusted as needed; this is a common technique in the testing field and will not be elaborated upon here.

[0037] After pretreatment, the raw water is fed into the sample digestion module. For clarity, this application will use "sample" to describe the raw water being collected during the raw water stage. The digested water and reaction water used in the downstream reaction stage will be described as "sample".

[0038] The sample digestion module includes sulfuric acid mixed with the raw water supplied by the raw water collection module. Specifically, the sulfuric acid is pumped via a peristaltic pump and initially mixed with the raw water through a T-junction. The T-junction, primarily for mixing, is a standard accessory and will not be described in detail. The main purpose of mixing the raw water with sulfuric acid is to acidify the sample. During total phosphorus determination, acidification prevents phosphates in the sample from being adsorbed by other substances or undergoing chemical changes, and it also facilitates the subsequent digestion process.

[0039] The mixture after the initial mixing passes through a heated reactor, which primarily provides a stable, controlled ambient temperature. During this process, the heated reactor's role is to aid in the decomposition of any complex organic compounds present in the sample through heating in an acidic environment, converting them into soluble inorganic phosphates. This is crucial for ensuring the detection of all forms of phosphorus (including organic and inorganic phosphorus). Specifically, heating accelerates the chemical reaction, allowing phosphorus compounds to be converted to orthophosphate forms more quickly, thereby improving the efficiency of the entire analytical process.

[0040] Furthermore, to ensure that all phosphorus exists in the form of orthophosphate, the mixture transported to the heated reactor is a second mix with potassium persulfate via a three-way valve. Potassium persulfate is a strong oxidizing agent that can effectively oxidize all forms of phosphorus to orthophosphate, facilitating subsequent ammonium molybdate spectrophotometric determination. The potassium persulfate is then transported and mixed with the mixture a second time via a peristaltic pump, and the resulting mixture is subjected to UV digestion. UV irradiation enhances the oxidizing power of potassium persulfate because UV light can excite it to produce stronger oxide species, such as hydroxyl radicals. These active species can more effectively disrupt complex organic structures, ensuring complete phosphorus oxidation. In addition, UV disinfection helps degrade potentially interfering substances in the sample, such as certain organic compounds or other non-target components, reducing their impact on phosphorus determination results. Thus, the sample preparation process for the reaction is completed, and the sample is transported to the injection reaction module.

[0041] The sample injection reaction module includes a colorimetric reagent that is mixed for the third time with the sample after UV digestion, ascorbic acid that is mixed for the fourth time with the sample after the third mixing, a peristaltic pump for pumping the colorimetric reagent and ascorbic acid, and a heating reactor for heating the mixture after the fourth mixing.

[0042] Specifically, after the sample and colorimetric reagent are mixed a third time through a three-way valve, the mixture passes through a surrounding reactor. At this stage, the main function of the surrounding reactor is to provide sufficient space for mixing and reaction, ensuring that the colorimetric reagent (e.g., ammonium molybdate) reacts completely with the orthophosphate in the sample to form phosphomolybdic heteropolyacid. Further, the third mixture is mixed a fourth time with ascorbic acid through a three-way valve, and then passed through a heated reactor to accelerate the conversion of phosphomolybdic heteropolyacid to phosphomolybdic blue complex.

[0043] At this stage, ammonium molybdate solution is used as the colorimetric reagent. Ammonium molybdate reacts with orthophosphate in the sample to form phosphomolybdic acid, which is further converted into a blue phosphomolybdic blue complex under the action of ascorbic acid. Ascorbic acid, also known as vitamin C, acts as a reducing agent, reducing phosphomolybdic acid to the phosphomolybdic blue complex. The absorbance of this complex at a specific wavelength can be used for quantitative analysis of phosphorus content. The sample then enters the detection module, which includes a flow cell containing the final reaction product and a detector for quantitative analysis of phosphorus content. In some embodiments, the detector is connected to a data processing workstation for automatic data analysis.

[0044] Thus, the integrated, all-scenario adaptable rapid total phosphorus detection platform provided in this application integrates multiple modules such as raw water collection, sample digestion, sample injection reaction and detection, realizing fully automated operation from raw water collection to final detection result output.

[0045] Furthermore, the entire process requires no manual intervention, significantly shortening analysis time and reducing operational complexity. This makes the platform suitable not only for detailed analysis in laboratory environments but also for rapid detection needs in field or industrial settings. It boasts significant advantages such as ease of operation, high detection speed, and high accuracy, providing a completely new solution for total phosphorus detection.

[0046] At the same time, no air bubbles need to be added between samples or between samples and reagents, enabling rapid and accurate analysis.

[0047] In the above embodiments, peristaltic pumps are used to deliver liquid in the raw water collection module, sample digestion module, and sample injection reaction module. Preferably, only one peristaltic pump is used, reducing the number of devices, making the entire detection process more compact and efficient, reducing complexity, and facilitating installation and maintenance. Simultaneously, this integrated design reduces operational errors that may be introduced by using multiple pumps, further improving the reliability and consistency of measurement results.

[0048] The method for rapid detection and analysis of total phosphorus using the integrated, all-scenario adaptable rapid total phosphorus detection platform described above is as follows:

[0049] Step S1: The autosampler takes a sample of the raw water and delivers it to the sampling valve via a peristaltic pump;

[0050] Step S2: The raw water sample is controlled by the sampling valve to pass through the sampling loop, and the sample is pushed to the sample digestion module by the carrier flow.

[0051] Step S3: After the sample is pushed, it is mixed with the pumped sulfuric acid through a three-way valve for the first time and then transported to the heated reactor 1;

[0052] Step S4: The mixture after heating and reaction is mixed a second time with the pumped potassium persulfate and then transported to ultraviolet digestion.

[0053] Step S5: The mixture after UV digestion is mixed for the third time with the pumped colorimetric reagent, and then mixed for the fourth time with the pumped ascorbic acid before being transported to the heated reactor 2.

[0054] Step S6: The mixture after reaction in the heated reactor 2 is transported to the flow cell and detected by the detector.

[0055] In this way, fully automated rapid total phosphorus detection can be completed. For automated sampling, step S1 of this application may also include step S11: the automatic switching of the autosampler between multiple sample tubes or online water samples.

[0056] The residual waste liquid from the sampling valve during the switching process can be handled through a waste liquid bottle connected to the sampling valve. Step S12 is executed before step S1: drain the waste liquid from the sampling valve into the waste liquid bottle.

[0057] As stated above, this application protects an integrated, all-scenario adaptable rapid total phosphorus detection platform, and all technical solutions that are the same as or similar to this application should be considered to fall within the scope of protection of this application.

Claims

1. An integrated, all-scenario adaptable rapid total phosphorus detection platform, characterized in that, It includes a raw water collection module, a sample digestion module, a sample injection reaction module, and a detection module; The raw water collection module includes an automatic sampler capable of automatically switching between multiple sample tubes and / or online water samples to collect raw water, as well as a peristaltic pump. The sample digestion module includes sulfuric acid mixed with the sample delivered by the raw water collection module through a three-way valve, a peristaltic pump for pumping the sulfuric acid, and a heating reactor for the mixture; potassium persulfate mixed with the mixture delivered by the heating reactor, a peristaltic pump for pumping the potassium persulfate, and an ultraviolet digestion device for the mixture. The sample injection reaction module includes a colorimetric reagent for mixing the sample after UV digestion, ascorbic acid for mixing the sample and the colorimetric reagent, a peristaltic pump for pumping the colorimetric reagent and ascorbic acid, and a heating reactor for the mixture. The detection module includes a flow cell for the final reaction product and a detector.

2. The integrated, all-scenario adaptable rapid total phosphorus detection platform as described in claim 1, characterized in that, The raw water acquisition module also includes a multi-turn rotatable sampling valve and a sampling ring for pumping raw water using a stable peristaltic pump.

3. The integrated, all-scenario adaptable rapid total phosphorus detection platform as described in claim 2, characterized in that, The raw water collection module also includes a flow-carrying tank that is pumped by a peristaltic pump. The flow-carrying tank is pumped to the sampling valve and pushes the raw water in the sampling ring to the sample digestion module.

4. The integrated, all-scenario adaptable rapid total phosphorus detection platform as described in claim 2, characterized in that, The sampling valve is equipped with a waste liquid discharge port.

5. The integrated, all-scenario adaptable rapid total phosphorus detection platform as described in claim 1, characterized in that, The number of peristaltic pumps is one, and the raw water collection module, sample digestion module, and sample injection reaction module all use the same peristaltic pump.

6. The integrated, all-scenario adaptable rapid total phosphorus detection platform as described in claim 1, characterized in that, It also includes a rear-end surrounding reactor after mixing with potassium persulfate and after mixing with the color developer.

7. The integrated, all-scenario adaptable rapid total phosphorus detection platform as described in claim 1, characterized in that, The raw water collection module also includes a cooling device that can control the raw water temperature of the sample tube and / or the autosampler.

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