Apparatus for measuring trace ions in pure water

Abstract

The utility model discloses a trace ion determination device in pure water, which comprises: a first multi-way switching valve, a quantitative ring, a sample injection needle and a chromatographic column are arranged on the first multi-way switching valve; a second multi-way switching valve, a concentration column and a first chromatographic pump are arranged on the first multi-way switching valve; the second multi-way switching valve is further connected with the first multi-way switching valve; a third multi-way switching valve, a second chromatographic pump and a cleaning container are arranged on the third multi-way switching valve; the third multi-way switching valve is further connected with the second multi-way switching valve; a fourth multi-way switching valve, the fourth multi-way switching valve is connected with the second multi-way switching valve and the third multi-way switching valve respectively; the fourth multi-way switching valve is configured to switch the liquid flow direction of the sample injection needle or the cleaning container output to the concentration column or a waste liquid container; a purifier is further arranged between the fourth multi-way switching valve and the third multi-way switching valve. The requirements of trace detection in pure water are met.

Description

Technical Field

[0001] This utility model relates to the field of ion chromatography detection technology, and in particular to a device for determining trace ions in pure water. Background Technology

[0002] Pure water refers to H2O without impurities. From an academic perspective, pure water, also known as high-purity water, refers to water with extremely high chemical purity. It is mainly used in fields such as biology, chemical engineering, metallurgy, aerospace, and power. However, it has very high requirements for water purity, so its most common application is in the electronics industry.

[0003] In the process of preparing pure water, anions and cations in the water can be removed using techniques such as electrodialysis, reverse osmosis, and ion exchange resins. After the pure water is prepared, it needs to be tested. Typically, ion chromatography is used for this purpose. However, due to the high purity of pure water, the content of residual ions is extremely low. Therefore, when sampling and testing with an ion chromatograph, it is impossible to accurately detect trace amounts of ions in pure water.

[0004] Therefore, the technical problem to be solved by this invention is how to design a technology that meets the requirements of trace ion chromatography detection in pure water and improves the detection accuracy. Utility Model Content

[0005] This invention provides a device for measuring trace ions in pure water, which meets the requirements for detecting trace ions in pure water and improves the accuracy of detection.

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

[0007] This invention provides a device for determining trace ions in pure water, comprising:

[0008] A first multi-way switching valve is provided with a quantitative loop, an injection needle and a chromatographic column, wherein the injection needle, the quantitative loop and the chromatographic column are respectively connected to the corresponding connection ports of the first multi-way switching valve;

[0009] The second multi-way switching valve is provided with a concentration column and a first chromatographic pump on the first multi-way switching valve. The concentration column and the first chromatographic pump are respectively connected to the corresponding connection ports of the second multi-way switching valve. The second multi-way switching valve is also connected to the first multi-way switching valve.

[0010] A third multi-way switching valve is provided with a second chromatography pump and a cleaning container, the cleaning container being configured to store cleaning water; the second chromatography pump and the cleaning container are respectively connected to the corresponding connection ports of the third multi-way switching valve; the third multi-way switching valve is also connected to the second multi-way switching valve.

[0011] A fourth multi-way switching valve is connected to the second multi-way switching valve and the third multi-way switching valve respectively; the fourth multi-way switching valve is configured to switch the flow of liquid output from the injection needle or the cleaning container to the concentration column or the waste container.

[0012] Furthermore, in the cleaning mode, the cleaning container, the third multi-way switching valve, the second chromatography pump, the fourth multi-way switching valve, the second multi-way switching valve, the concentration column, and the waste liquid container are connected in sequence.

[0013] Furthermore, the cleaning solution output from the cleaning container flows into the second chromatography pump via a third multi-way switching valve;

[0014] The cleaning solution output from the second chromatography pump flows sequentially through the third, fourth, and second multiple-way switching valves into the concentration column;

[0015] The cleaning fluid flowing out of the concentration column flows into the waste liquid container through the second multi-way switching valve.

[0016] Furthermore, in the rinsing mode, the injection needle, the first multi-way switching valve, the second multi-way switching valve, the third multi-way switching valve, the second chromatography pump, the fourth multi-way switching valve, and the waste liquid container are connected in sequence.

[0017] Furthermore, the sample solution output from the injection needle sequentially passes through the first multi-way switching valve, the second multi-way switching valve, and the third multi-way switching valve before entering the second chromatographic pump.

[0018] The sample solution output from the second chromatography pump flows into the waste container via the third and fourth multiplex valves.

[0019] Furthermore, in enrichment mode, the injection needle, the first multi-way switching valve, the third multi-way switching valve, the second chromatographic pump, the fourth multi-way switching valve, the second multi-way switching valve, the concentration column, and the waste liquid container are connected in sequence.

[0020] Furthermore, the sample solution output from the injection needle sequentially passes through the first multi-way switching valve, the second multi-way switching valve, and the third multi-way switching valve before entering the second chromatographic pump.

[0021] The sample solution output from the second chromatographic pump flows sequentially through the third, fourth, and second multiplex valves into the concentration column;

[0022] The sample solution flowing out of the concentration column flows into the waste container through the second multi-way switching valve.

[0023] Furthermore, in elution mode, the first chromatographic pump, the second multi-way switching valve, the concentration column, the first multi-way switching valve, the quantitative loop, and the chromatographic column are connected in sequence.

[0024] Furthermore, the eluent output from the first chromatographic pump flows sequentially into the concentration column through the second multi-way switching valve;

[0025] The eluent output from the concentration column flows into the metering loop via the second multi-way switching valve and the first multi-way switching valve;

[0026] The eluent output from the quantitative loop flows into the chromatographic column through the first multi-way switching valve.

[0027] By configuring multiple multi-way switching valves, the flow path can be switched according to different working modes. The first chromatographic pump is used to elute the concentrated column with sufficient ions from pure water after the concentrated column has been enriched. The eluent is then delivered to the concentrated column for ion chromatography detection. The second chromatographic pump serves two purposes: firstly, it delivers cleaning solution to clean the multi-way switching valves and the concentrated column; secondly, after the multi-way switching valves switch states, the second pump injects the pure water sample to be tested through the injection needle, using the pure water sample to clean the multi-way switching valves and the connecting tubing. This avoids excessive errors in the actual detection process caused by excessively high ion content in the cleaning solution. By using the pure water sample to be tested to rinse the multi-way switching valves and connecting tubing, the influence of external ions is minimized, ensuring that the ions enriched in the concentrated column originate from the pure water sample to be tested. This meets the detection requirements for trace ions in pure water and improves detection accuracy. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the trace ion determination device in pure water of this utility model in the rinsing mode;

[0029] Figure 2 This is a schematic diagram of the trace ion determination device in pure water of this utility model in the rinsing mode;

[0030] Figure 3 This is a schematic diagram of the trace ion determination device in pure water of this utility model in enrichment mode;

[0031] Figure 4 This is a schematic diagram of the trace ion determination device in pure water of this utility model in elution mode;

[0032] Figure 5 This is a schematic diagram of the trace ion determination device in pure water of this utility model in standard sample injection mode.

[0033] Figure label:

[0034] 1. First multi-way switching valve; 11. Quantitative loop; 12. Injection needle; 13. Chromatographic column; 14. Third chromatographic pump;

[0035] 2. Second multi-way switching valve; 21. Concentration column; 22. First chromatographic pump;

[0036] 3. Third multi-way switching valve; 31. Second chromatography pump; 32. Cleaning container;

[0037] 4. Fourth multi-way switching valve;

[0038] 5. Waste liquid containers;

[0039] 6. Air purifier. Detailed Implementation

[0040] like Figures 1-5 As shown, this utility model provides a device for determining trace ions in pure water, comprising:

[0041] A first multi-way switching valve 1 is provided with a quantitative loop 11, an injection needle 12 and a chromatographic column 13, wherein the injection needle 12, the quantitative loop 11 and the chromatographic column 13 are respectively connected to the corresponding connection ports of the first multi-way switching valve 1.

[0042] The second multi-way switching valve 2 is provided with a concentration column 21 and a first chromatographic pump 22 on the first multi-way switching valve 1. The concentration column 21 and the first chromatographic pump 22 are respectively connected to the corresponding connection ports of the second multi-way switching valve 2. The second multi-way switching valve 2 is also connected to the first multi-way switching valve 1.

[0043] A third multi-way switching valve 3 is provided with a second chromatography pump 31 and a cleaning container 32. The cleaning container 32 is configured to store cleaning water. The second chromatography pump 31 and the cleaning container 32 are respectively connected to the corresponding connection ports of the third multi-way switching valve 3. The third multi-way switching valve 3 is also connected to the second multi-way switching valve 2.

[0044] The fourth multi-way switching valve 4 is connected to the second multi-way switching valve 2 and the third multi-way switching valve 3 respectively; the fourth multi-way switching valve 4 is configured to switch the liquid output from the injection needle 12 or the cleaning container 32 to the concentration column 21 or the waste liquid container 5.

[0045] Specifically, the trace ion determination device in pure water is equipped with four multi-way switching valves, which can be used to meet the needs of sample injection, cleaning, rinsing, enrichment and elution during the pure water detection process.

[0046] The quantitative loop 11 is connected to two corresponding connection ports on the first multi-way switching valve 1. The corresponding connection ports of the first multi-way switching valve 1 are also connected to the injection needle 12 and the corresponding connection ports of the second multi-way switching valve 2 through pipelines.

[0047] In practical use, four or more switching valves can be used in conjunction to clean the concentration column 21 with pure water, use the sample to rinse the detection flow path, enrich the sample through the concentration column 21, and finally elute the concentration column 21 to achieve ion chromatography analysis and detection.

[0048] Preferably, a purifier 6 is also provided between the fourth multi-way switching valve 4 and the third multi-way switching valve 3.

[0049] Specifically, the water flowing out of the fourth multi-way switching valve 4 is further purified by the purifier 6. The purifier 6 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 21, eliminating the need to purchase additional pure water for cleaning and reducing the need for external pipeline connections.

[0050] As for purifier 6, its function is to remove anions and cations from the flowing water. The physical manifestation of purifier 6 can be any existing device capable of removing anions and cations from water. For example, it can use EDI (Electrodeionization, also known as continuous electro-desalination technology) to purify water, as illustrated by Chinese patent publication numbers CN207047024U and CN213595947U. These will not be elaborated upon or limited here.

[0051] In one embodiment, in the cleaning mode of the trace ion determination device in pure water, the cleaning container 32, the third multi-way switching valve 3, the second chromatography pump 31, the fourth multi-way switching valve 4, the second multi-way switching valve 2, the concentration column 21, and the waste liquid container 5 are connected in sequence.

[0052] Specifically, such as Figure 1 As shown, before performing pure water testing on the sample, the detection flow path of the trace ion determination device can be preliminarily cleaned with pure water. The pure water is delivered to the second chromatography pump 31 via the third multi-way switching valve 3. After the interior of the second chromatography pump 31 is cleaned with pure water, the pure water output from the second chromatography pump 31 flows through the fourth multi-way switching valve 4 and the second multi-way switching valve 2 and is delivered to the concentration column 21 for cleaning. Finally, the waste liquid is discharged from the second multi-way switching valve 2 to the waste liquid container 5.

[0053] The cleaning solution output from the cleaning container 32 flows into the second chromatography pump 31 via the third multi-way switching valve 3; the cleaning solution output from the second chromatography pump 31 flows sequentially through the third multi-way switching valve 3, the fourth multi-way switching valve 4, and the second multi-way switching valve 2 into the concentration column 21; the cleaning solution flowing out of the concentration column 21 flows into the waste liquid container 5 via the second multi-way switching valve 2.

[0054] In one embodiment, in the rinse mode of the trace ion determination device in pure water, the injection needle 12, the first multi-way switching valve 1, the second multi-way switching valve 2, the third multi-way switching valve 3, the second chromatographic pump 31, the fourth multi-way switching valve 4, and the waste liquid container 5 are connected in sequence.

[0055] Specifically, because the purity of the pure water sample being tested is very high—higher than that of ordinary purified water—the pure water sample can be used to rinse the detection path of the trace ion determination device again before being transported to the concentration column 21, thus more effectively cleaning the detection path.

[0056] The pure water sample is drawn in through the injection needle 12 and flows sequentially through the first multi-way switching valve 1, the second multi-way switching valve 2, the third multi-way switching valve 3 and the fourth multi-way switching valve 4, and is finally discharged from the fourth multi-way switching valve 4 into the waste liquid container 5.

[0057] After being rinsed with pure water samples, the trace ion measuring device can more effectively and clearly detect residual ions in the flow path and related pipelines, which is more conducive to improving the detection accuracy of pure water samples.

[0058] The sample solution output from the injection needle 12 sequentially passes through the first multi-way switching valve 1, the second multi-way switching valve 2, and the third multi-way switching valve 3 before entering the second chromatography pump 31; the sample solution output from the second chromatography pump 31 flows into the waste liquid container 5 through the third multi-way switching valve 3 and the fourth multi-way switching valve 4.

[0059] In one embodiment, in the enrichment mode of the trace ion determination device in pure water, the injection needle 12, the first multi-way switching valve 1, the third multi-way switching valve 3, the second chromatographic pump 31, the fourth multi-way switching valve 4, the second multi-way switching valve 2, the concentration column 21, and the waste liquid container 5 are connected in sequence.

[0060] Specifically, after rinsing the detection flow path of the trace ion determination device with pure water, the sample can be injected through the injection needle 12 for enrichment using the concentration column 21. The pure water sample is drawn in through the injection needle 12 and flows sequentially through the first multi-way switching valve 1, the second multi-way switching valve 2, the third multi-way switching valve, the second chromatography pump 31, and the fourth multi-way switching valve 4. The pure water sample output from the fourth multi-way switching valve 4 is then transported to the second multi-way switching valve 2 to enter the concentration column 21 for enrichment.

[0061] The sample solution output from the injection needle 12 sequentially passes through the first multi-way switching valve 1, the second multi-way switching valve 2, and the third multi-way switching valve 3 before entering the second chromatographic pump 31; the sample solution output from the second chromatographic pump 31 sequentially flows through the third multi-way switching valve 3, the fourth multi-way switching valve 4, and the second multi-way switching valve 2 into the concentration column 21; the sample solution flowing out of the concentration column 21 flows through the second multi-way switching valve 2 into the waste liquid container 5.

[0062] During the enrichment process, the injection volume of the injection needle 12 can be controlled by the second chromatographic pump 31, thereby calculating the injection volume of the pure water sample. In this way, it is not necessary to configure a large-capacity quantitative container, and a sufficient amount of pure water sample can be injected according to the enrichment requirements to meet the requirements of accurate detection of pure water samples.

[0063] In one embodiment, in the elution mode of the trace ion determination device in pure water, the first chromatographic pump 22, the second multi-way switching valve 2, the concentration column 21, the first multi-way switching valve 1, the quantitative loop 11 and the chromatographic column 13 are connected in sequence.

[0064] Specifically, after enriching the pure water sample using the concentration column 21, the concentration column 21 can be eluted using the eluent. Driven by the first chromatographic pump 22, the eluent is delivered into the concentration column 21 via the second multi-way switching valve 2. The ions enriched in the concentration column 21 are eluted using the eluent. The eluted ions flow with the eluent into the quantitative loop 11 and finally enter the chromatographic column 13 for separation and determination.

[0065] The eluent output by the first chromatographic pump 22 flows into the concentration column 21 through the second multi-way switching valve 2; the eluent output from the concentration column 21 flows into the quantitative loop 11 through the second multi-way switching valve 2 and the first multi-way switching valve 1; and the eluent output from the quantitative loop 11 flows into the chromatographic column 13 through the first multi-way switching valve 1.

[0066] In addition, such as Figure 5 As shown, during ion chromatography analysis, when a standard sample needs to be injected, the first multi-way switching valve 2 is activated, connecting the injection needle 12, the quantitative loop 11, and the third chromatographic pump 14 in sequence. The standard sample is injected through the injection needle 12, and any excess standard sample is transported to the waste liquid container 5 via the third chromatographic pump 14. Then, the process is switched back to the first multi-way switching valve 2. Figure 2 In the state of the sample, the standard in the quantitative loop 11 is delivered to the chromatographic column 13 of the ion chromatograph by the first chromatographic pump 22.

[0067] The specific process of ion chromatography analysis of the liquid in the column by the ion chromatograph is to refer to the analysis process of conventional ion chromatographs, and no restrictions are imposed here.

[0068] This application also provides a detection method for the above-mentioned trace ion determination device in pure water, including: sample injection mode, rinsing mode, enrichment mode and elution mode;

[0069] In injection mode, the sample solution is injected into the quantitative loop 11 through the injection needle 12;

[0070] In cleaning mode, the cleaning solution flows sequentially through the third multi-way switching valve 3, the second chromatography pump 31, the fourth multi-way switching valve 4, and the second multi-way switching valve 2 into the concentration column 21 for cleaning.

[0071] In the rinsing mode, the sample solution is drawn in through the injection needle 12 and flows sequentially through the first multi-way switching valve 1, the second multi-way switching valve 2, the third multi-way switching valve 3, the second chromatography pump 31, and the fourth multi-way switching valve 4.

[0072] In enrichment mode, the sample solution is injected into the concentration column 21 through the injection needle 12;

[0073] In elution mode, the eluent flows sequentially through the first chromatographic pump 22, the second multi-way switching valve 2, the concentration column 21, the first multi-way switching valve 1, the quantitative loop 11, and the chromatographic column 13.

[0074] By configuring multiple multi-way switching valves, the flow path can be switched according to different working modes. The first chromatographic pump is used to elute the concentrated column with sufficient ions from pure water after the concentrated column has been enriched. The eluent is then delivered to the concentrated column for ion chromatography detection. The second chromatographic pump serves two purposes: firstly, it delivers cleaning solution to clean the multi-way switching valves and the concentrated column; secondly, after the multi-way switching valves switch states, the second pump injects the pure water sample to be tested through the injection needle, using the pure water sample to clean the multi-way switching valves and the connecting tubing. This avoids excessive errors in the actual detection process caused by excessively high ion content in the cleaning solution. By using the pure water sample to be tested to rinse the multi-way switching valves and connecting tubing, the influence of external ions is minimized, ensuring that the ions enriched in the concentrated column originate from the pure water sample to be tested. This meets the detection requirements for trace ions in pure water and improves detection accuracy.

[0075] 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 determining trace ions in pure water, characterized in that, include: A first multi-way switching valve is provided with a quantitative loop, an injection needle and a chromatographic column, wherein the injection needle, the quantitative loop and the chromatographic column are respectively connected to the corresponding connection ports of the first multi-way switching valve; The second multi-way switching valve is provided with a concentration column and a first chromatographic pump on the first multi-way switching valve. The concentration column and the first chromatographic pump are respectively connected to the corresponding connection ports of the second multi-way switching valve. The second multi-way switching valve is also connected to the first multi-way switching valve. A third multi-way switching valve is provided with a second chromatography pump and a cleaning container, the cleaning container being configured to store cleaning water; the second chromatography pump and the cleaning container are respectively connected to the corresponding connection ports of the third multi-way switching valve; the third multi-way switching valve is also connected to the second multi-way switching valve. A fourth multi-way switching valve is connected to the second multi-way switching valve and the third multi-way switching valve respectively; the fourth multi-way switching valve is configured to switch the flow of liquid output from the injection needle or the cleaning container to the concentration column or the waste container.

2. The device for determining trace ions in pure water according to claim 1, characterized in that, In cleaning mode, the cleaning container, the third multi-way switching valve, the second chromatography pump, the fourth multi-way switching valve, the second multi-way switching valve, the concentration column, and the waste liquid container are connected in sequence.

3. The device for determining trace ions in pure water according to claim 2, characterized in that, The cleaning solution output from the cleaning container flows into the second chromatography pump via the third multi-way switching valve; The cleaning solution output from the second chromatography pump flows sequentially through the third, fourth, and second multiple-way switching valves into the concentration column; The cleaning fluid flowing out of the concentration column flows into the waste liquid container through the second multi-way switching valve.

4. The device for determining trace ions in pure water according to claim 1, characterized in that, In the rinsing mode, the injection needle, the first multi-way switching valve, the second multi-way switching valve, the third multi-way switching valve, the second chromatography pump, the fourth multi-way switching valve, and the waste liquid container are connected in sequence.

5. The device for determining trace ions in pure water according to claim 4, characterized in that, The sample solution output from the injection needle sequentially passes through the first multi-way switching valve, the second multi-way switching valve, and the third multi-way switching valve before entering the second chromatographic pump. The sample solution output from the second chromatography pump flows into the waste container via the third and fourth multiplex valves.

6. The device for determining trace ions in pure water according to claim 1, characterized in that, In enrichment mode, the injection needle, the first multi-way switching valve, the third multi-way switching valve, the second chromatographic pump, the fourth multi-way switching valve, the second multi-way switching valve, the concentration column, and the waste container are connected in sequence.

7. The device for determining trace ions in pure water according to claim 6, characterized in that, The sample solution output from the injection needle sequentially passes through the first multi-way switching valve, the second multi-way switching valve, and the third multi-way switching valve before entering the second chromatographic pump. The sample solution output from the second chromatographic pump flows sequentially through the third, fourth, and second multiplex valves into the concentration column; The sample solution flowing out of the concentration column flows into the waste container through the second multi-way switching valve.

8. The device for determining trace ions in pure water according to claim 1, characterized in that, In elution mode, the first chromatographic pump, the second multi-way switching valve, the concentration column, the first multi-way switching valve, the quantitative loop, and the chromatographic column are connected in sequence.

9. The device for determining trace ions in pure water according to claim 8, characterized in that, The eluent output from the first chromatographic pump flows sequentially into the concentration column through the second multi-way switching valve; The eluent output from the concentration column flows into the metering loop via the second multi-way switching valve and the first multi-way switching valve; The eluent output from the quantitative loop flows into the chromatographic column through the first multi-way switching valve.

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