Gas-phase molecular absorption spectrometer flow path system

Abstract

The utility model belongs to gas phase molecular absorption spectrometer flow path design technical field discloses a kind of gas phase molecular absorption spectrometer flow path system.The gas phase molecular absorption spectrometer flow path system includes: quantitative ring, UV online digestion device, heating device, gas-liquid separation reaction device and switch valve;the outlet end of heating device is connected with the import end of gas-liquid separation reaction device;gas-liquid separation reaction device further includes exhaust port, and exhaust port is communicated with the detection cell set;switch valve controls the outlet end of quantitative ring and the import end of heating device direct communication, or, switch valve controls the outlet end of quantitative ring after UV online digestion device again and the import end of heating device communication.The utility model, by setting the switch valve, specific sample is distributed to the most suitable flow path;Clean sample avoids unnecessary UV irradiation, saves time, reduces energy consumption and equipment loss;Complex sample enters digestion mode, to ensure accurate result.

Description

Technical Field

[0001] This utility model belongs to the field of flow path design technology for gas phase molecular absorption spectrometers, specifically, it relates to a flow path system for a gas phase molecular absorption spectrometer. Background Technology

[0002] Gas phase molecular absorption spectrometry (GMP) is a technique for quantitative analysis based on the characteristic absorption of ultraviolet light by gaseous molecules. It is widely used for the detection of ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, sulfides, and other substances in environmental water quality. The key lies in converting the analyte in the liquid phase into a gas through a chemical reaction, and then efficiently separating it from the liquid phase before sending it to the detection cell for measurement.

[0003] In practical applications, water sample matrices are complex and diverse. For clean, transparent samples (such as surface water and groundwater), gas-liquid separation and detection can usually be completed simply by heating and conducting a chemical reaction. However, for samples with complex compositions, containing organic interfering substances, or with dark colors (such as industrial wastewater and domestic sewage), pretreatment is necessary to decompose organic matter and remove color interference; otherwise, the accuracy of the detection will be severely affected.

[0004] To address this challenge, existing technologies primarily offer the following solutions: 1. Instruments with integrated fixed UV digestion modules: Currently, most mid-to-high-end gas chromatography-molecular absorption spectrometers on the market have integrated online UV digestion devices as standard or optional components into the system. However, the flow path design of these instruments is usually fixed or semi-fixed. That is, the sample flow path either passes through the UV digester by default or not. For users who need to process mixed samples, if the instrument flow path is fixed in "digestion mode," the sample will need to pass through the UV digestion device unnecessarily when analyzing clean samples, resulting in prolonged analysis time, reduced UV lamp life, and wasted energy. If the instrument flow path is fixed in "conventional mode," it cannot handle sudden and complex sample analysis, lacking flexibility. 2. Instruments with preliminary switching capabilities: Some advanced models attempt to address this issue by introducing multi-port valves, but their design may prioritize flow path cleaning or multi-functional expansion. They lack proprietary and sophisticated design for intelligent, optimized process switching to address the specific need of "whether to perform UV digestion." Their switching logic may not be optimally matched to sample characteristics, or there may be risks of residue or cross-contamination after switching.

[0005] Therefore, those skilled in the art are still pursuing a more flexible, precise, and efficient flow path system for gas phase molecular absorption spectrometers. This system should be able to automatically, seamlessly, and with zero residue switch between a "conventional analysis flow path" and a "UV digestion analysis flow path" based on the actual characteristics of the sample, thereby maximizing detection efficiency, extending the lifespan of core components, and reducing operating costs while ensuring data accuracy.

[0006] In view of the above, this application is hereby submitted. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing flow path system, which is simple and has low flow path rationality. The purpose is to provide a gas phase molecular absorption spectrometer flow path system with flow path that can be switched as needed and has higher flow path rationality.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is: a flow path system for a gas phase molecular absorption spectrometer, comprising: A quantitative loop containing a sample solution; UV online digestion device; Heating device; A gas-liquid separation reaction device, wherein the outlet end of the heating device is connected to the inlet end of the gas-liquid separation reaction device; the gas-liquid separation reaction device also includes an exhaust port, which is connected to a detection pool. A switching valve controls the outlet end of the metering loop to be directly connected to the inlet end of the heating device, or the switching valve controls the outlet end of the metering loop to be connected to the inlet end of the heating device after passing through the UV online digestion device.

[0009] According to one embodiment of the present invention, it further includes a first three-way module and an injection pump, wherein the injection pump stores a carrier solution; Both the syringe pump and the metering loop are connected to the inlet of the switching valve through the first three-way module.

[0010] According to one embodiment of the present invention, it further includes a first peristaltic pump, which is disposed between the outlet end of the first three-way module and the inlet end of the switching valve.

[0011] According to one embodiment of the present invention, it further includes a second three-way module and a digestion solution container; The switching valve includes a first outlet and a second outlet; The first outlet of the switching valve and the digestion solution container are respectively connected to the two inlet ends of the second three-way module, and the outlet end of the second three-way module is connected to the inlet end of the UV online digestion device.

[0012] According to one embodiment of the present invention, a second peristaltic pump is further included, which is disposed between the digestion solution container and the second three-way module.

[0013] According to one embodiment of the present invention, it further includes a third three-way module, which includes two inlet ends and one outlet end; The outlet of the UV online digestion device and the second outlet of the switching valve are respectively connected to the two inlet ends of the third three-way module.

[0014] According to one embodiment of the present invention, the outlet end of the third three-way module is connected to the inlet end of the heating device; It also includes a carrier gas and reagent injection device, which is installed on the pipeline between the outlet end of the third three-way module and the inlet end of the heating device.

[0015] According to one embodiment of the present invention, the carrier gas and reagent injection device includes: A carrier gas container used to hold carrier gas; The MFC mass flow meter has its inlet end connected to the carrier gas container. Containers for holding reaction reagents; The third peristaltic pump has its inlet connected to the container holding the reaction reagents. The multi-port module includes three inlets and one outlet; the outlet of the third three-port module, the outlet of the MFC mass flow meter, and the outlet of the third peristaltic pump are respectively connected to the three inlets of the multi-port module.

[0016] According to one embodiment of the present invention, the gas-liquid separation reaction device further includes a drain port through which the separated liquid is discharged.

[0017] According to one embodiment of the present invention, the gas phase molecular absorption spectrometer flow path system further includes a fourth peristaltic pump, which is connected to the drain port.

[0018] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: In this invention, the switching valve, specifically designed for the two processes, allows the system to intelligently allocate specific samples to the most suitable flow path according to a preset program or operator instructions. Clean samples are routed through the "fast track" (normal mode), avoiding unnecessary UV irradiation, saving time, and reducing energy consumption and equipment wear; complex samples are forced into the "digestion track" (digestion mode) to ensure accurate results.

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the flow path system of the gas phase molecular absorption spectrometer in an embodiment of this utility model; Figure 2 This is a spectrum of discontinuous flow signal from a gas-phase molecular absorption spectrometer in an embodiment of this utility model.

[0021] Description of main components in the diagram: 1. Metering loop; 2. UV online digestion device; 3. Heating device; 4. Gas-liquid separation reaction device; 5. Switching valve; 6. First three-way module; 7. Injection pump; 8. First peristaltic pump; 9. Second three-way module; 10. Second peristaltic pump; 11. Third three-way module; 12. MFC mass flow meter; 13. Third peristaltic pump; 14. Multi-way module; 15. Fourth peristaltic pump.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] like Figure 1 and Figure 2 As shown, the flow path system of a gas phase molecular absorption spectrometer according to this utility model includes: A quantitative loop 1, wherein the quantitative loop 1 stores the sample solution; 2. UV online digestion device; Heating device 3; The gas-liquid separation reaction device 4 is provided, wherein the outlet end of the heating device 3 is connected to the inlet end of the gas-liquid separation reaction device; the gas-liquid separation reaction device 4 also includes an exhaust port, which is connected to a detection pool. The switching valve 5 controls the outlet end of the metering ring 1 to be directly connected to the inlet end of the heating device 3, or the switching valve 5 controls the outlet end of the metering ring 1 to be connected to the inlet end of the heating device 3 after passing through the UV online digestion device 2.

[0027] The gas phase molecular absorption spectrometer flow path system provided by this utility model: 1. The system achieves intelligent, on-demand switching detection modes: Through a switching valve specifically designed for both processes, the system can intelligently allocate specific samples to the most suitable flow path according to preset programs or operator instructions. Clean samples pass through the "fast track" (normal mode), avoiding unnecessary UV irradiation, saving time, reducing energy consumption and equipment wear; complex samples are forced into the "digestion track" (digestion mode) to ensure accurate results. This on-demand allocation mechanism is a significant improvement compared to fixed flow path equipment. 2. Optimized integration and automation: Compared to integrated systems with fixed functions or solutions requiring external preprocessing, this invention achieves a high degree of automated integration of two analytical processes within a single instrument. Users can switch modes via software control without changing hardware connections, greatly improving operational convenience and the instrument's automation level, making it particularly suitable for continuous analysis of batches and diverse samples; 3. Improved analytical efficiency and economy: It avoids the resource waste of fixed UV digestion instruments when processing clean samples, significantly shortens the analysis cycle of a single clean sample, and increases throughput. At the same time, it also avoids the high costs and operational complexity of maintaining two independent systems or performing offline digestion, achieving a better cost-performance ratio; 4. Ensures the accuracy and reliability of the analysis: The proprietary flow path switching design ensures the cleanliness of the flow path and minimizes the risk of cross-contamination. Regardless of the mode, the sample is processed along the optimized path, thus guaranteeing the accuracy and repeatability of the final analytical data.

[0028] Please see the appendix Figure 1 In one specific embodiment of this example, the gas phase molecular absorption spectrometer flow path system further includes a first three-way module 6 and an injection pump 7, wherein the injection pump 7 stores a carrier solution. Both the syringe pump 7 and the metering ring 1 are connected to the inlet end of the switching valve 5 through the first three-way module 6.

[0029] In one specific embodiment of this example, the syringe pump 7 is a 25mL high-precision syringe pump for quantitative injection, achieving precise injection of large volumes; The syringe pump 7 has a 6cm stroke and an error of ≤1%, enabling high-precision injection, online dilution, and automatic labeling.

[0030] In one specific embodiment of this invention, the heater uses heat conduction and thermocouple temperature control to achieve a temperature control range of 60-150℃ with an error of ±1℃.

[0031] Please see the appendix Figure 1 In one specific embodiment of this example, the gas phase molecular absorption spectrometer flow path system further includes a first peristaltic pump 8, which is disposed between the outlet end of the first three-way module 6 and the inlet end of the switching valve 5.

[0032] In one specific embodiment of this invention, the pipes and connecting modules in the flow path system of the gas phase molecular absorption spectrometer are all made of engineering plastics with good chemical stability and resistance to acids and alkalis.

[0033] Please see the appendix Figure 1 In one specific embodiment of this example, the gas phase molecular absorption spectrometer flow path system further includes a second three-way module 9 and a digestion solution container. The switching valve 5 includes a first outlet and a second outlet; The first outlet of the switching valve 5 and the digestion solution container are respectively connected to the two inlet ends of the second three-way module 9, and the outlet end of the second three-way module 9 is connected to the inlet end of the UV online digestion device 2.

[0034] Please see the appendix Figure 1 In one specific embodiment of this example, the gas phase molecular absorption spectrometer flow path system further includes a second peristaltic pump 10, which is disposed between the digestion solution container and the second three-way module 9.

[0035] Please see the appendix Figure 1 In one specific embodiment of this example, the gas phase molecular absorption spectrometer flow path system further includes a third three-way module 11, which includes two inlet ends and one outlet end. The outlet of the UV online digestion device 2 and the second outlet of the switching valve 5 are respectively connected to the two inlet ends of the third three-way module 11.

[0036] Please see the appendix Figure 1 In one specific embodiment of this example, in the flow path system of the gas phase molecular absorption spectrometer, the outlet end of the third three-way module 11 is connected to the inlet end of the heating device 3. It also includes a carrier gas and reagent injection device, which is installed on the pipeline between the outlet end of the third three-way module 11 and the inlet end of the heating device 3.

[0037] Please see the appendix Figure 1 In one specific embodiment of this invention, the gas phase molecular absorption spectrometer flow path system and the carrier gas and reagent injection device include: A carrier gas container used to hold carrier gas; MFC mass flow meter 12, the inlet of which is connected to the carrier gas container; Containers for holding reaction reagents; The third peristaltic pump 13 has its inlet end connected to the container holding the reaction reagent; The multi-port module 14 includes three inlets and one outlet; the outlet of the third three-way module 11, the outlet of the MFC mass flow meter 12, and the outlet of the third peristaltic pump 13 are respectively connected to the three inlets of the multi-port module 14.

[0038] In one specific embodiment of this example, the MFC mass flow meter 12 has an accuracy of ±0.1 mL / min.

[0039] In one specific embodiment of this example, the gas-liquid separation reaction device 4 further includes a drain port through which the liquid separated by the reaction is discharged.

[0040] In one specific embodiment of this invention, the interfaces of the pipelines and modules of the gas phase molecular absorption spectrometer flow path system all adopt a combination of threaded sleeves, inverted conical pressure rings, and O-rings to ensure sealing and prevent bursting and leakage.

[0041] Please see the appendix Figure 1 In one specific embodiment of this example, the gas phase molecular absorption spectrometer flow path system further includes a fourth peristaltic pump 15, which is connected to the drain port of the gas-liquid separation reaction device 4.

[0042] The gas phase molecular absorption spectrometer flow path system provided in this application fills the pipeline with a carrier solution before powering on and initializing the system. The syringe pump 7 operates to remove impurities or air bubbles, ensuring accurate dispensing; After the solution is injected, the injection tubing needs to be cleaned to ensure no cross-contamination. The cleaning tubing should be cleaned with a carrier solution. When the syringe pump 7 draws a flow rate, the solution drawn into the syringe is also the carrier solution.

[0043] The attached diagram Figure 2 The image shown is a spectrum of the discontinuous flow signal from the gas phase molecular absorption spectrometer in this embodiment of the present invention.

[0044] The gas phase molecular absorption spectrometer flow path system provided in this application adopts the principle of intermittent flow. A syringe pump accurately quantifies the sample solution, and through valve switching, a peristaltic pump drives the sample injection, enabling the analysis of sulfides, total nitrogen, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen by gas phase molecular absorption spectrometry. The specific workflow is as follows: 1. Place the sample tube in the sample solution, run the syringe pump to measure the amount, and store the sample solution in the metering loop; 2. The sample tube is placed in the carrier solution. P1 (first peristaltic pump) runs, sequentially introducing the sample solution into the three-way module and then the multi-way module. P3 (third peristaltic pump) introduces the reaction reagents. Simultaneously, the carrier gas is stably supplied under the control of the MFC mass flow meter. After all the sample solution has been extracted from the quantitative loop (first, the syringe pump quantifies the sample solution; then P1 runs to extract the sample solution from the quantitative loop; P1 continues running until all the sample solution has been extracted, then the syringe pump pushes out the carrier solution to clean the tubing and prevent flow path memory effect); if a UV online digestion system is required, adjust the switching valve, and P2 (second peristaltic pump) introduces the digestion solution into the reaction system. 3. The carrier gas thoroughly mixes the sample solution and the reaction reagent solution, then enters the heating system and is introduced into the gas-liquid separation reaction system; 4. The deep-pipe drainage method of the gas-liquid separation system allows the solution (and gas) to be in a bubbling state, thoroughly stimulating the gas reaction. Additionally, P4 (the fourth peristaltic pump) operates, bubbling and reacting simultaneously before waste is discharged. The carrier gas carries the target gas generated in the reaction into the gas-liquid separation system, which then enters the detection pool for analysis.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A flow path system for a gas phase molecular absorption spectrometer, characterized in that, include: A quantitative loop containing a sample solution; UV online digestion device; Heating device; A gas-liquid separation reaction device, wherein the outlet end of the heating device is connected to the inlet end of the gas-liquid separation reaction device; the gas-liquid separation reaction device also includes an exhaust port, which is connected to a detection pool. A switching valve controls the outlet end of the metering loop to be directly connected to the inlet end of the heating device, or the switching valve controls the outlet end of the metering loop to be connected to the inlet end of the heating device after passing through the UV online digestion device.

2. The flow path system for a gas phase molecular absorption spectrometer according to claim 1, characterized in that, It also includes a first three-way module and an injection pump, wherein the injection pump stores a carrier solution; Both the syringe pump and the metering loop are connected to the inlet of the switching valve through the first three-way module.

3. The flow path system for a gas phase molecular absorption spectrometer according to claim 2, characterized in that, It also includes a first peristaltic pump, which is disposed between the outlet end of the first three-way module and the inlet end of the switching valve.

4. The flow path system for a gas phase molecular absorption spectrometer according to claim 2, characterized in that, It also includes a second three-way valve module and a container for holding the digestion solution; The switching valve includes a first outlet and a second outlet; The first outlet of the switching valve and the digestion solution container are respectively connected to the two inlet ends of the second three-way module, and the outlet end of the second three-way module is connected to the inlet end of the UV online digestion device.

5. The flow path system for a gas phase molecular absorption spectrometer according to claim 4, characterized in that, It also includes a second peristaltic pump, which is disposed between the digestion solution container and the second three-way module.

6. The flow path system for a gas phase molecular absorption spectrometer according to claim 4, characterized in that, It also includes a third three-way module, which has two inlet ends and one outlet end; The outlet of the UV online digestion device and the second outlet of the switching valve are respectively connected to the two inlet ends of the third three-way module.

7. The flow path system for a gas phase molecular absorption spectrometer according to claim 6, characterized in that, The outlet end of the third three-way module is connected to the inlet end of the heating device; It also includes a carrier gas and reagent injection device, which is installed on the pipeline between the outlet end of the third three-way module and the inlet end of the heating device.

8. The flow path system for a gas phase molecular absorption spectrometer according to claim 7, characterized in that, The carrier gas and reagent injection device includes: A carrier gas container used to hold carrier gas; The MFC mass flow meter has its inlet end connected to the carrier gas container. Containers for holding reaction reagents; The third peristaltic pump has its inlet connected to the container holding the reaction reagents. The multi-port module includes three inlets and one outlet; the outlet of the third three-port module, the outlet of the MFC mass flow meter, and the outlet of the third peristaltic pump are respectively connected to the three inlets of the multi-port module.

9. A flow path system for a gas phase molecular absorption spectrometer according to any one of claims 1-8, characterized in that, The gas-liquid separation reaction device also includes a drain port through which the separated liquid is discharged.

10. The flow path system for a gas phase molecular absorption spectrometer according to claim 9, characterized in that, It also includes a fourth peristaltic pump, which is connected to the drain port.

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