Hydrogen peroxide ion chromatography analysis device

Abstract

This utility model discloses a hydrogen peroxide ion chromatography analysis device, comprising: a first flow path switching assembly, which includes a first multi-way switching valve, a first quantitative loop, and a second quantitative loop, wherein the first quantitative loop and the second quantitative loop are respectively connected to corresponding connection ports of the first multi-way switching valve, and the volume of the first quantitative loop is smaller than the volume of the second quantitative loop; a second flow path switching assembly, which includes a second multi-way switching valve and a concentration column, wherein the concentration column is connected to a corresponding connection port of the second multi-way switching valve; a chromatographic analysis assembly, which includes a chromatographic column, a suppressor, and a conductivity cell connected in sequence; an injection assembly, which includes an injection needle; and an eluent delivery pump, which is configured to deliver eluent to the second multi-way switching valve. This device achieves the requirement for trace detection of hydrogen peroxide.

Description

Technical Field

[0001] This utility model relates to the field of ion chromatography detection technology, and in particular to a hydrogen peroxide ion chromatography analysis device. Background Technology

[0002] In ion chromatography, the sample is first dissolved. After dissolution, before entering the ion chromatography column for analysis, it is often necessary to purify the sample to prevent impurities from entering the ion chromatography column and contaminating it. Purification methods include simple membrane filtration or further processing, such as selectively enriching trace analytes from a complex matrix or selectively removing the matrix.

[0003] When high-purity hydrogen peroxide is used for ion detection, its strong corrosive properties can damage the chromatographic column. Conventional techniques typically employ inductively coupled plasma mass spectrometry (ICP-MS) for this purpose. For example, Chinese Patent Publication No. CN116773641A discloses a method for directly injecting trace elements into high-purity solvents such as alcohols, ethers, and their esters, or hydrogen peroxide, using ICP-MS to detect trace substances in hydrogen peroxide. However, ICP-MS is primarily used for quantitative elemental analysis, typically targeting metallic elements, and cannot meet the requirements for detecting anions and cations.

[0004] Therefore, how to design a technique that satisfies the requirements of trace ion chromatography detection in hydrogen peroxide is the technical problem that this utility model aims to solve. Utility Model Content

[0005] This invention provides a hydrogen peroxide ion chromatography analysis device to meet the requirements for trace detection of hydrogen peroxide.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a hydrogen peroxide ion chromatography analysis device, comprising:

[0008] The first flow path switching component includes a first multi-way switching valve, a first metering loop, and a second metering loop. The first metering loop and the second metering loop are respectively connected to the corresponding connection ports of the first multi-way switching valve. The volume of the first metering loop is smaller than the volume of the second metering loop.

[0009] The second flow path switching component includes a second multi-way switching valve and a concentration column, wherein the concentration column is connected to the corresponding connection port of the second multi-way switching valve;

[0010] A chromatographic analysis assembly, comprising a chromatographic column, a suppressor, and a conductivity cell connected in sequence;

[0011] A sample introduction assembly, which includes a sample introduction needle;

[0012] A rinsing fluid delivery pump, the rinsing fluid delivery pump being configured to deliver rinsing fluid into the second multi-way switching valve;

[0013] The first multi-way switching valve is configured to switch the connection between the first quantitative loop and the injection needle or the second multi-way switching valve, and is also configured to switch the connection between the second quantitative loop and the injection needle or between the chromatographic analysis component and the second multi-way switching valve;

[0014] The second multi-way switching valve is configured to switch the connection between the concentration column and the eluent delivery pump, the first quantitative loop and the chromatographic analysis component, or is configured to switch the connection between the concentration column and the eluent delivery pump, the second quantitative loop and the chromatographic analysis component, or is configured to switch the connection between the concentration column and the chromatographic analysis component;

[0015] A purifier is also installed between the conductivity cell and the first multi-way switching valve.

[0016] Furthermore, the injection assembly also includes an injection pump connected to the first multi-way switching valve; the first multi-way switching valve is configured to switch the connection of the first metering loop or the second metering loop between the injection needle and the injection pump.

[0017] Furthermore, the hydrogen peroxide ion chromatography analyzer is in sample injection mode;

[0018] The first multi-way switching valve switches the connection between the second quantitative loop and the injection needle, and switches the connection between the first quantitative loop and the second multi-way switching valve.

[0019] The second multi-way switching valve switches the eluent delivery pump, the concentration column, the first quantitative loop, the chromatographic column, the suppressor, and the conductivity cell in sequence.

[0020] Furthermore, the outlet of the conductivity cell is connected to the regeneration inlet of the suppressor.

[0021] Furthermore, the hydrogen peroxide ion chromatography analyzer is in rinsing mode;

[0022] The first multi-way switching valve switches the connection between the second quantitative loop and the injection needle, and switches the connection between the first quantitative loop and the second multi-way switching valve.

[0023] The second multi-way switching valve switches the eluent delivery pump, the first quantitative loop, the chromatographic column, the suppressor, the conductivity cell, and the concentration column in sequence.

[0024] Furthermore, the outlet of the concentration column is connected to the regeneration inlet of the suppressor.

[0025] Furthermore, the hydrogen peroxide ion chromatography analyzer is in enrichment mode;

[0026] The first multi-way switching valve switches the connection of the first quantitative loop to the injection needle, and switches the connection of the second quantitative loop to the second multi-way switching valve and the chromatographic analysis component, respectively.

[0027] The second multi-way switching valve switches the eluent delivery pump, the chromatographic column, the suppressor, the conductivity cell, the second quantitative loop, and the concentration column in sequence.

[0028] Furthermore, the outlet of the concentration column is connected to the regeneration inlet of the suppressor.

[0029] Furthermore, the hydrogen peroxide ion chromatography analyzer is in elution mode;

[0030] The first multi-way switching valve switches the connection of the first quantitative loop to the injection needle, and switches the connection of the second quantitative loop to the second multi-way switching valve and the chromatographic analysis component, respectively.

[0031] The second multi-way switching valve switches the eluent delivery pump, the concentration column, the chromatographic column, the suppressor, the conductivity cell, and the second quantitative loop in sequence.

[0032] Furthermore, the outlet of the second metering ring is connected to the regeneration inlet of the suppressor.

[0033] Furthermore, the injection assembly also includes an injection pump connected to the first multi-way switching valve; the first multi-way switching valve is configured to switch the connection of the first metering loop or the second metering loop between the injection needle and the injection pump.

[0034] By configuring a first flow path switching component and a second flow path switching component, the first multi-way switching valve in the first flow path switching component meets the requirements for switching between the first and second quantitative loops for sample injection. The first quantitative loop is used to inject the standard solution, while the second quantitative loop is used to inject hydrogen peroxide. The second quantitative loop has a larger volume, sufficient to allow for the injection of a sufficient amount of hydrogen peroxide sample. During operation, the flow path is switched via the second multi-way switching valve, allowing the eluent, after being processed by the chromatographic analysis component, to enter the second quantitative loop. This carries the hydrogen peroxide sample from the second quantitative loop into the concentration column. The hydrogen peroxide in the hydrogen peroxide is washed away with the eluent, while other ions in the hydrogen peroxide are adsorbed into the concentration column. The flow path is then switched again via the second multi-way switching valve, allowing the eluent to elute the ions adsorbed in the concentration column and deliver them to the chromatographic analysis component for chromatographic analysis. This avoids the direct delivery of high-concentration hydrogen peroxide into the chromatographic column, which could damage the column. This allows for the use of ion chromatography to meet the requirements for trace hydrogen peroxide detection. In addition, during use, the eluent can first flow into the chromatographic analysis unit and be treated by the suppressor to form pure water, which can effectively rinse the concentration column, thus improving the accuracy of ion detection after the concentration column is enriched. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the hydrogen peroxide ion chromatography analysis device of this utility model in sample injection mode;

[0036] Figure 2 This is a schematic diagram of the hydrogen peroxide ion chromatography analysis device of this utility model in rinsing mode;

[0037] Figure 3 This is a schematic diagram of the hydrogen peroxide ion chromatography analysis device of this utility model in enrichment mode;

[0038] Figure 4 This is a schematic diagram of the hydrogen peroxide ion chromatography analyzer in elution mode.

[0039] Figure label:

[0040] 1. First flow path switching component; 11. First multi-way switching valve; 12. First metering loop; 13. Second metering loop;

[0041] 2. Second flow path switching assembly; 21. Second multi-way switching valve; 22. Concentration column;

[0042] 3. Chromatographic analysis components; 31. Chromatographic column; 32. Suppressor; 33. Conductivity cell; 34. Purifier;

[0043] 4. Sample injection assembly; 41. Sample injection needle; 42. Sample injection pump;

[0044] 5. Rinse solution transfer pump. Detailed Implementation

[0045] like Figures 1-4 As shown, this utility model provides a hydrogen peroxide ion chromatography analysis device, comprising:

[0046] The first flow path switching component 1 includes a first multi-way switching valve 11, a first metering ring 12, and a second metering ring 13. The first metering ring 12 and the second metering ring 13 are respectively connected to the corresponding connection ports of the first multi-way switching valve 11. The volume of the first metering ring 12 is smaller than the volume of the second metering ring 13.

[0047] The second flow path switching component 2 includes a second multi-way switching valve 21 and a concentration column 22, wherein the concentration column 22 is connected to the corresponding connection port of the second multi-way switching valve 21.

[0048] Chromatographic analysis component 3 includes a chromatographic column 31, a suppressor 32 and a conductivity cell 33 connected in sequence;

[0049] The injection assembly 4 includes an injection needle 41;

[0050] A rinsing fluid delivery pump 5 is configured to deliver rinsing fluid into the second multi-way switching valve 21;

[0051] The first multi-way switching valve 11 is configured to switch the connection of the first quantitative loop 12 to the injection needle 41 or the second multi-way switching valve 21, and is also configured to switch the connection of the second quantitative loop 13 to the injection needle 41 or to the chromatographic analysis component 3 and the second multi-way switching valve 21.

[0052] The second multi-way switching valve 21 is configured to switch the connection between the concentration column 22 and the eluent delivery pump 5, the first quantitative loop 12 and the chromatographic analysis component 3, or to switch the connection between the concentration column 22 and the eluent delivery pump 5, the second quantitative loop 13 and the chromatographic analysis component 3, or to switch the connection between the concentration column 22 and the chromatographic analysis component 3.

[0053] Specifically, the first metering ring 12 and the second metering ring 13 are connected to the connection port of the first multi-way switching valve 11, and the corresponding connection port of the first multi-way switching valve 11 is also connected to the corresponding connection port of the second multi-way switching valve 21 through a pipeline.

[0054] Similarly, for the second multi-way switching valve 21, the concentration column 22 is connected to the corresponding connection port of the second multi-way switching valve 21.

[0055] The injection needle 41 is connected to the corresponding connection port of the first multi-way switching valve 11. In addition, in order to meet the injection requirements, the injection pump 42 is also connected to the corresponding connection port of the first multi-way switching valve 11.

[0056] The rinsing fluid transfer pump 5 is connected to the corresponding connection port of the second multi-way switching valve 21.

[0057] For the chromatographic analysis component 3, the inlet of the chromatographic column 31 is connected to the corresponding connection port of the second multi-way switching valve 21, the regeneration liquid inlet of the suppressor 32 is connected to the corresponding connection port of the second multi-way switching valve 21, and the outlet of the conductivity cell 33 is connected to the corresponding connection port of the first multi-way switching valve 11.

[0058] During use, the first multi-way switching valve 11 can switch between the first metering ring 12 and the second metering ring 13 as needed, connecting them between the injection needle 41 and the injection pump 42. When the first metering ring 12 is connected between the injection needle 41 and the injection pump 42, standard sample injection can be achieved; while when the second metering ring 13 is connected between the injection needle 41 and the injection pump 42, hydrogen peroxide sample injection can be achieved.

[0059] During use, the second multi-way switching valve 21 can perform cleaning, enrichment, and desorption treatments on the concentration column 22 as needed. When cleaning of the concentration column 22 is required, the eluent will first be switched through the second multi-way switching valve 21, allowing the eluent to flow into the chromatographic analysis component 3. The eluent is then converted into pure water by the suppressor 32, and the pure water will flow into the concentration column 22 to achieve online cleaning of the concentration column 22.

[0060] When enrichment is required, the eluent is first switched via the second multi-way switching valve 21, allowing it to flow into the chromatographic analysis component 3. The eluent is then converted into pure water by the suppressor 32. This pure water flows into the first multi-way switching valve 11, flushing the hydrogen peroxide sample in the second quantitative loop 13 into the concentration column 22. In the concentration column 22, the hydrogen peroxide in the hydrogen peroxide is washed away, and other ions are adsorbed onto the column, achieving ion enrichment.

[0061] When desorption is required, the eluent is first switched via the second multi-way switching valve 21, allowing it to flow into the concentration column 22. The eluent then elutes the ions from the concentration column 22. The eluted ions are then carried by the eluent to the chromatographic column 31 for separation and determination.

[0062] Preferably, during the washing and enrichment process, in order to improve the purity of the pure water that is suppressed by the suppressor 32 and delivered to the concentration column 22 or the second quantitative ring 13, a purifier 34 is also provided between the conductivity cell 33 and the first multi-way switching valve 11.

[0063] Specifically, the water flowing out of the conductivity cell 33 is further purified by the purifier 34. The purifier 34 further washes away impurities and ions in the water, thereby improving the purity of the water flowing out of the water purifier. This achieves a more thorough and effective cleaning of the concentration column 22, eliminating the need to purchase additional pure water for cleaning and reducing the need for external pipeline connections.

[0064] As for the purifier 34, its function is to remove anions and cations from the flowing water. The physical manifestation of the purifier 34 can be any existing device that removes anions and cations from water. For example, it can use EDI (Electrodeionization, also known as continuous electro-desalination technology) to purify water, such as Chinese patent publication numbers CN207047024U and CN213595947U, which will not be elaborated or limited here.

[0065] In one embodiment, the hydrogen peroxide ion chromatography analyzer is in sample injection mode;

[0066] The first multi-way switching valve 11 switches the connection of the second quantitative loop 13 to the injection needle 41, and switches the connection of the first quantitative loop 12 to the second multi-way switching valve 21;

[0067] The second multi-way switching valve 21 switches the eluent delivery pump 5, the concentration column 22, the first quantitative loop 12, the chromatographic column 31, the suppressor 32, and the conductivity cell 33 in sequence.

[0068] Specifically, in injection mode, refer to Figure 1 The first multi-way switching valve 11 switches the second quantitative loop 13 between the injection needle 41 and the injection pump 42. The hydrogen peroxide sample solution is delivered to the second quantitative loop 13 through the injection needle 41 under the action of the injection pump 42 to complete the sample injection operation.

[0069] At this time, the second multi-way switching valve 21 switches the eluent delivery pump 5, the concentration column 22, and the chromatographic analysis component 3 in sequence. After passing through the concentration column 22, the eluent flows into the suppressor 32. The suppressor 32 causes the eluent to turn into water. The suppressed water then flows through the corresponding connection port of the first multi-way switching valve 11 to clean the connected pipeline, further reducing the background conductivity and minimizing its impact on the experiment.

[0070] The outlet of the conductivity cell 33 is connected to the regeneration liquid inlet of the suppressor 32.

[0071] In one embodiment, the hydrogen peroxide ion chromatography analyzer is in rinsing mode;

[0072] The first multi-way switching valve 11 switches the connection of the second quantitative loop 13 to the injection needle 41, and switches the connection of the first quantitative loop 12 to the second multi-way switching valve 21;

[0073] The second multi-way switching valve 21 switches the eluent delivery pump 5, the first quantitative loop 12, the chromatographic column 31, the suppressor 32, the conductivity cell 33, and the concentration column 22 in sequence.

[0074] Specifically, in flushing mode, refer to Figure 2 The second multi-way switching valve 21 connects the eluent delivery pump 5, the chromatographic analysis component 3, and the concentration column 22 in sequence. After flowing out of the eluent delivery pump 5, the eluent first passes through a small quantitative loop, the chromatographic column 31, and the suppressor 32. After suppression, the eluent is converted into water. The water output from the conductivity cell 33 flows through the corresponding connection port of the first multi-way switching valve 11 to the concentration column 22. This serves two purposes: firstly, to clean the connected pipelines, and secondly, to wash away any residual eluent in the concentration column 22. This prevents residual eluent in the concentration column 22 from affecting its enrichment effect during the enrichment process.

[0075] Preferably, in the process of replacing the eluent in the concentration column 22 with water, the water suppressed by the suppressor 32 first flows through the purifier 34, where the purifier 34 further washes away the impurity ions, and then flows through the concentration column 22 to replace the eluent in the concentration column 22 with water, so as to improve the enrichment effect in the later stage.

[0076] The outlet of the concentration column 22 is connected to the regeneration liquid inlet of the suppressor 32.

[0077] In one embodiment, the hydrogen peroxide ion chromatography analyzer is in enrichment mode;

[0078] The first multi-way switching valve 11 switches the connection of the first quantitative loop 12 to the injection needle 41, and switches the connection of the second quantitative loop 13 to the second multi-way switching valve 21 and the chromatographic analysis component 3 respectively;

[0079] The second multi-way switching valve 21 switches the eluent delivery pump 5, the chromatographic column 31, the suppressor 32, the conductivity cell 33, the second quantitative loop 13, and the concentration column 22 in sequence.

[0080] Specifically, in the enrichment model, refer to Figure 3 The first multi-way switching valve 11 switches the connection between the second quantitative loop 13 and the second multi-way switching valve 21 and the chromatographic analysis component 3. Simultaneously, the second multi-way switching valve 21 switches the sequential connection between the eluent delivery pump 5, the chromatographic analysis component 3, and the concentration column 22. After flowing out from the eluent delivery pump 5, the eluent first passes through the chromatographic column 31 and the suppressor 32. After suppression, the eluent is converted into water and delivered to the conductivity cell 33. The water output from the conductivity cell 33 flows through the corresponding connection port of the first multi-way switching valve 11 to the second quantitative loop 13, and the water delivers the hydrogen peroxide sample in the second quantitative loop 13 to the concentration column 22. In the concentration column 22, the hydrogen peroxide in the hydrogen peroxide is washed away, and other ions are adsorbed into the concentration column 22.

[0081] Since the eluent is suppressed by the suppressor 32 to form water, the water then transports the hydrogen peroxide in the second metering ring 13 to the concentration column 22, and at the same time, it can also clean the second metering ring 13, thereby meeting the requirements of the next test.

[0082] The outlet of the concentration column 22 is connected to the regeneration liquid inlet of the suppressor 32.

[0083] In one embodiment, the hydrogen peroxide ion chromatography analyzer is in elution mode;

[0084] The first multi-way switching valve 11 switches the connection of the first quantitative loop 12 to the injection needle 41, and switches the connection of the second quantitative loop 13 to the second multi-way switching valve 21 and the chromatographic analysis component 3 respectively;

[0085] The second multi-way switching valve 21 switches the eluent delivery pump 5, the concentration column 22, the chromatographic column 31, the suppressor 32, the conductivity cell 33, and the second quantitative loop 13 in sequence.

[0086] Specifically, in the washout mode, refer to Figure 4 The first multi-way switching valve 11 and the second multi-way switching valve 21 cooperate with each other to switch the eluent delivery pump 5, the concentration column 22, and the chromatographic analysis component 3 in sequence. After the eluent flows out of the eluent delivery pump 5, it enters the concentration column 22. The ions enriched in the concentration column 22 are eluted by the eluent, and the eluted ions enter the chromatographic column 31 for separation and determination.

[0087] This allows for ion chromatography analysis of high-purity hydrogen peroxide, solving the technical problem that hydrogen peroxide cannot pass through chromatographic column 31 for ion chromatography analysis.

[0088] The outlet of the second metering ring 13 is connected to the regeneration liquid inlet of the suppressor 32.

[0089] The first quantitative ring 12 is used to inject a standard sample as the basis for determination. The specific procedure for standard determination in ion chromatography can be found in existing ion chromatography standard determination procedures, and will not be limited or elaborated upon here. Since the volume of the second quantitative ring 13 is much larger than that of the first quantitative ring 12 (e.g., the volume range of the first quantitative ring 12 is 20 μl-50 μl, and the volume range of the second quantitative ring 13 is 500 μl-1500 μl), using the larger second quantitative ring 13 to inject the sample allows for the detection of trace ions in hydrogen peroxide.

[0090] This utility model also provides a detection method for the above-mentioned hydrogen peroxide ion chromatography analysis device, including: injection mode, rinsing mode, enrichment mode and elution mode;

[0091] In injection mode, hydrogen peroxide sample solution is injected into the second quantitative loop 13 through injection needle 41; the eluent flows into the concentration column 22. Specifically, injection needle 41 draws hydrogen peroxide sample solution (e.g., 1000 μL) and injects it into the second quantitative loop 13, filling it completely. Since the second quantitative loop 13 has a volume of 1000 μL, it can hold a relatively large amount of sample, making it suitable for trace ion detection. Eluent delivery pump 5 delivers eluent, which flows directly into the concentration column 22 through the second multi-way switching valve 21. The eluent provides initial rinsing of the concentration column 22, removing residual impurities and preparing it for subsequent enrichment.

[0092] In rinsing mode, the eluent flows sequentially through the first quantitative loop 12, the chromatographic column 31, the suppressor 32, and the conductivity cell 33 before entering the concentration column 22 for cleaning. Specifically, the eluent is output from the eluent delivery pump 5, flows sequentially through the second multi-way switching valve 21, the first quantitative loop 12, the chromatographic column 31, the suppressor 32, and the conductivity cell 33, and finally enters the concentration column 22. The eluent cleans the first quantitative loop 12 to ensure the accuracy of ion concentration during subsequent standard sample injection. The eluent output from the first quantitative loop 12 is suppressed by the suppressor 32 to form water, which then flows back into the concentration column 22 to clean any residual eluent in the concentration column 22, ensuring effective and accurate enrichment of trace ions in subsequent stages.

[0093] During this process, the eluent first washes away any impurities that may remain in the first quantitative loop 12, while simultaneously equilibrating the chromatographic column 31 to ensure it is in a stable separation state. The concentration column 22 is then further cleaned to remove any non-target substances that may remain in the injection mode and to avoid cross-contamination.

[0094] In enrichment mode, the eluent flows sequentially through column 31, suppressor 32, and conductivity cell 33 into the second quantitative loop 13. The liquid in the second quantitative loop 13 is then transported to the concentration column 22 for enrichment. Specifically, because the concentration column 22 has a strong adsorption capacity for target ions (such as chloride ions and sulfate ions), the target ions in hydrogen peroxide are enriched on the concentration column 22, while hydrogen peroxide and other weakly retained components flow out with the eluent. This achieves effective separation and enrichment of the target ions from the matrix, improving detection sensitivity for trace ion detection.

[0095] In elution mode, the eluent flows sequentially through the concentration column 22, the chromatographic column 31, the suppressor 32, and the conductivity cell 33, before entering the second quantitative loop 13 for elution. Specifically, the eluent delivery pump delivers the eluent to the concentration column 22, eluting the target ions enriched on the column. The eluent then sequentially enters the chromatographic column 31, the suppressor 32, and the conductivity cell 33 for detection, generating a chromatogram. The target ion concentration is calculated based on the peak area or peak height.

[0096] By configuring the first flow path switching component 1 and the second flow path switching component 2, the first multi-way switching valve 11 in the first flow path switching component 1 meets the requirements for switching the injection of the first quantitative loop 12 and the second quantitative loop 13. The standard solution is injected through the first quantitative loop 12, while hydrogen peroxide is injected through the second quantitative loop 13. The second quantitative loop 13 has a large volume, which can meet the requirement of injecting sufficient hydrogen peroxide sample. During use, the flow path is switched by the second multi-way switching valve 21, allowing the eluent to enter the second quantitative loop 13 after being processed by the chromatographic analysis component 3. The hydrogen peroxide sample in the second quantitative ring 13 flows into the concentration column 22. The hydrogen peroxide in the hydrogen peroxide is washed away with the eluent, while other ions in the hydrogen peroxide are adsorbed into the concentration column 22. The flow path is then switched again via the second multi-way switching valve 21, and the ions adsorbed in the concentration column 22 are eluted by the eluent and transported to the chromatographic analysis component 3 for chromatographic analysis. This avoids directly delivering high-concentration hydrogen peroxide to the chromatographic column 31, which could damage it, thus enabling the use of ion chromatography to meet the requirements for trace hydrogen peroxide detection. Furthermore, during use, the eluent can first flow into the chromatographic analysis component 3 and be treated by the suppressor 32 to form pure water, effectively rinsing the concentration column 22. This further improves the accuracy of ion detection after the concentration column 22 has been enriched.

[0097] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A device for ion chromatography of hydrogen peroxide, characterized in that include: The first flow path switching component includes a first multi-way switching valve, a first metering loop, and a second metering loop. The first metering loop and the second metering loop are respectively connected to the corresponding connection ports of the first multi-way switching valve. The volume of the first metering loop is smaller than the volume of the second metering loop. The second flow path switching component includes a second multi-way switching valve and a concentration column, wherein the concentration column is connected to the corresponding connection port of the second multi-way switching valve; A chromatographic analysis assembly, comprising a chromatographic column, a suppressor, and a conductivity cell connected in sequence; A sample introduction assembly, which includes a sample introduction needle; A rinsing fluid delivery pump, the rinsing fluid delivery pump being configured to deliver rinsing fluid into the second multi-way switching valve; The first multi-way switching valve is configured to switch the connection between the first quantitative loop and the injection needle or the second multi-way switching valve, and is also configured to switch the connection between the second quantitative loop and the injection needle or between the chromatographic analysis component and the second multi-way switching valve; The second multi-way switching valve is configured to switch the connection between the concentration column and the eluent delivery pump, the first quantitative loop and the chromatographic analysis component, or is configured to switch the connection between the concentration column and the eluent delivery pump, the second quantitative loop and the chromatographic analysis component, or is configured to switch the connection between the concentration column and the chromatographic analysis component.

2. The apparatus for ion chromatography of hydrogen peroxide according to claim 1, characterized in that, The hydrogen peroxide ion chromatography analyzer is in sample injection mode; The first multi-way switching valve switches the connection between the second quantitative loop and the injection needle, and switches the connection between the first quantitative loop and the second multi-way switching valve. The second multi-way switching valve switches the eluent delivery pump, the concentration column, the first quantitative loop, the chromatographic column, the suppressor, and the conductivity cell in sequence.

3. The apparatus for ion chromatography of hydrogen peroxide according to claim 2, characterized in that The outlet of the conductivity cell is connected to the regeneration inlet of the suppressor.

4. The apparatus for ion chromatography of hydrogen peroxide according to claim 1, characterized in that, The hydrogen peroxide ion chromatography analyzer is in rinsing mode; The first multi-way switching valve switches the connection between the second quantitative loop and the injection needle, and also switches the connection between the first quantitative loop and the second multi-way switching valve. The second multi-way switching valve switches the eluent delivery pump, the first quantitative loop, the chromatographic column, the suppressor, the conductivity cell, and the concentration column in sequence.

5. The apparatus for ion chromatography of hydrogen peroxide according to claim 4, characterized in that, The outlet of the concentration column is connected to the regeneration inlet of the suppressor.

6. The apparatus for ion chromatography of hydrogen peroxide according to claim 1, characterized in that, The hydrogen peroxide ion chromatography analyzer is in enrichment mode; The first multi-way switching valve switches the connection of the first quantitative loop to the injection needle, and switches the connection of the second quantitative loop to the second multi-way switching valve and the chromatographic analysis component, respectively. The second multi-way switching valve switches the eluent delivery pump, the chromatographic column, the suppressor, the conductivity cell, the second quantitative loop, and the concentration column in sequence.

7. The apparatus for ion chromatography of hydrogen peroxide according to claim 6, characterized in that The outlet of the concentration column is connected to the regeneration inlet of the suppressor.

8. The apparatus for ion chromatography of hydrogen peroxide according to claim 1, characterized in that, The hydrogen peroxide ion chromatography analyzer is in elution mode; The first multi-way switching valve switches the connection of the first quantitative loop to the injection needle, and switches the connection of the second quantitative loop to the second multi-way switching valve and the chromatographic analysis component, respectively. The second multi-way switching valve switches the eluent delivery pump, the concentration column, the chromatographic column, the suppressor, the conductivity cell and the second quantification ring in sequence.

9. The apparatus for ion chromatography of hydrogen peroxide according to claim 6, characterized in that, The liquid outlet of the second quantification ring is connected to the regenerant inlet of the suppressor.

10. The apparatus for ion chromatography of hydrogen peroxide according to any one of claims 1 to 9, characterized in that The sample injection assembly further comprises a sample injection pump, and the sample injection pump is connected to the first multi-way switching valve; the first multi-way switching valve is configured to switch the first quantification ring or the second quantification ring to be connected between the sample injection needle and the sample injection pump.

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