A sampling device and method of liquid ion analysis

Abstract

The present application relates to the technical field of ion analysis, and particularly relates to a sampling device and a liquid ion analysis method. The sampling device comprises a first tube body and a second tube body. The two ends of the first tube body can be connected with the first matching tube or the second matching tube of the second tube body, so that the multiple first tube bodies can be connected at one time by using the second tube body. When the sample solution is diluted and sampled, the re-diluted solution of different dilution ratios is obtained by simply repeating the dilution step. The sampling process does not need to sample the sample solution multiple times, and directly uses the multiple first tube bodies and the second tube body to cooperate to continuously dilute the sample solution multiple times at the same ratio, greatly simplifies the manual operation steps in the dilution sampling process, can greatly reduce the system error caused by human operation in the sampling process, and improves the precision and accuracy of the measurement result.

Description

Technical Field

[0001] This invention relates to the field of ion analysis technology, specifically to a sampling device and a liquid ion analysis method. Background Technology

[0002] Lithium is an indispensable raw material supporting the development of the new energy vehicle industry. Since lithium extraction from brine and seawater generates large amounts of water samples, ionic component analysis is necessary. This analysis typically involves diluting the sample solution by different factors and then analyzing the ionic components in the diluted solutions to obtain highly accurate ion concentration data.

[0003] However, in existing ion component analysis processes, the concentration differences of different ions in the liquid can be several orders of magnitude, necessitating multiple dilutions. When diluting the sample solution, pipettes are used to take samples separately to prepare dilution solutions of different folds; manual sampling inevitably amplifies systematic errors. Furthermore, the process of repeatedly sampling and mixing the sample solution and diluent is cumbersome, leading to significant errors in the final ion concentration measurement data. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large error in the measurement data of ion concentration obtained in the liquid ion analysis process of the prior art, thereby providing a sampling device and a liquid ion analysis method.

[0005] To address the aforementioned technical problems, the present invention provides a sampling device, comprising:

[0006] The first tube has an open end and a baffle at the other end. The baffle has a first liquid outlet. The inner cavity of the first tube has a separator and a second liquid outlet.

[0007] The second tube body includes a first fitting tube and a second fitting tube. An isolation element is provided between the first fitting tube and the second fitting tube. A third liquid passage is provided on the isolation element. A sealing element is provided at the end of the second fitting tube away from the first fitting tube. A fourth liquid passage is provided on the sealing element.

[0008] The first fitting tube is adapted to be sealed to the end of the first tube body that has a baffle, and the second fitting tube is adapted to be sealed to the open end of the first tube body.

[0009] When the first fitting tube is fitted with the first tube body, it has a first state in which the first liquid outlet and the third liquid outlet are aligned with each other to make the first fitting tube and the first tube body communicate, and a second state in which both the first liquid outlet and the third liquid outlet are closed to completely isolate the first fitting tube from the first tube body.

[0010] When the second fitting tube is fitted with the first tube body, it has a third state in which the second liquid outlet and the fourth liquid outlet are aligned with each other to allow the second fitting tube to communicate with the first tube body, and a fourth state in which both the second liquid outlet and the fourth liquid outlet are closed to completely isolate the second fitting tube from the first tube body.

[0011] Optionally, the first liquid outlet and / or the second liquid outlet and / or the third liquid outlet and / or the fourth liquid outlet are fan-shaped openings.

[0012] Optionally, the number of the first liquid passage and / or the second liquid passage and / or the third liquid passage and / or the fourth liquid passage is even, and the multiple first liquid passages or the multiple second liquid passages or the multiple third liquid passages or the multiple fourth liquid passages are arranged in a centrally symmetrical manner.

[0013] Optionally, the baffle divides the first tube into a first sub-tube and a second sub-tube, with a volume ratio of 9:1 between the first sub-tube and the second sub-tube.

[0014] Optionally, it also includes a third tube, which is open at one end and completely closed at the other end.

[0015] Optionally, the first fitting tube is adapted to be threadedly engaged with the end of the first tube body that has a retaining element, and the second fitting tube is adapted to be threadedly engaged with the open end of the first tube body.

[0016] The present invention also provides a liquid ion analysis method, using the sampling device described in the present invention, the method comprising the following steps:

[0017] Take a first tube and a second tube, connect the first fitting tube of the second tube to the open end of the first tube, and put the first tube and the second tube in a second state;

[0018] Add diluent into the first tube from the open end until the liquid level reaches the separator. Continue adding sample solution into the first tube until the liquid level is flush with the open end of the first tube. Mix the sample solution and diluent evenly to obtain the initial diluted solution.

[0019] Take another first tube and another second tube. Connect the first fitting tube of the second tube to the open end of the first tube, and put the second tube and the second tube in the second state. Add diluent to the other tube until the liquid level reaches its separator. Connect the open end of the first tube to the second fitting tube of the first second tube, and put the second tube and the first second tube in the third state. Adjust the first tube and the first second tube to the first state. Add the solution in the first tube to the second tube until the liquid level is flush with the open end of the second tube. Adjust the first tube and the first second tube to the second state. Mix the solution in the second tube evenly to obtain a re-diluted solution. Repeat the above steps to obtain re-diluted solutions with different dilution ratios.

[0020] The ion concentrations in the initial diluted solution and multiple subsequent diluted solutions were measured.

[0021] Optionally, the step of mixing the sample solution and the diluent uniformly includes: sealing the open end of the first tube and shaking the first tube.

[0022] Optionally, the shaking step of the first tube body is as follows: manually flip the first tube body up and down at least 30 times or use a mixer to vibrate the first tube body for at least 10 seconds.

[0023] Optionally, during ion concentration measurement, the end of the first tube with the baffle is closed, and all the first tubes are placed in the spectrometer autosampler. The spectrometer is then used to measure the liquid ion concentration data in each first tube.

[0024] The technical solution of this invention has the following advantages:

[0025] 1. The sampling device provided by the present invention includes a first tube and a second tube. Both ends of the first tube can be connected to a first fitting tube or a second fitting tube of the second tube, allowing multiple first tubes to be connected simultaneously using the second tube. When diluting and sampling a sample solution, firstly, one first tube and one second tube are taken. The first fitting tube of the second tube is connected to the open end of the first tube, placing the first and second tubes in a second state. Diluent is added into the first tube from its open end until the liquid level reaches the separator. Sample solution is then added until the liquid level is flush with the open end of the first tube. The sample solution and diluent are mixed evenly to obtain a first diluted solution. Then take another first tube and another second tube, connect the first fitting tube of the second tube to the open end of the first tube, and put the second tube and the first tube in the second state. Add diluent to the other tube until the liquid level reaches its separator. Connect the open end of the second tube to the second fitting tube of the first tube, and put the second tube and the first tube in the third state. Adjust the first tube and the first second tube to the first state. Add the solution in the first tube to the second tube until the liquid level is flush with the open end of the second tube. Adjust the first tube and the first second tube to the second state. Mix the solution in the second tube evenly to obtain a re-diluted solution. Repeat the above steps to obtain re-diluted solutions with different dilution ratios. The sampling process eliminates the need for multiple samplings of the sample solution. By using multiple first and second tubes in combination, the sample solution can be continuously diluted in equal proportions multiple times. This greatly simplifies the manual operation steps in the dilution sampling process, significantly reduces systematic errors caused by human operation during sampling, and improves the precision and accuracy of the measurement results.

[0026] 2. The sampling device provided by the present invention has a first liquid outlet and / or a second liquid outlet and / or a third liquid outlet and / or a fourth liquid outlet in the shape of a fan. The size of the fan-shaped opening can be adjusted by rotating the first tube and the second tube, which facilitates the control of the flow rate of the solution during liquid passage.

[0027] 3. The liquid ion analysis method provided by this invention involves using the sampling device described in this invention to repeatedly dilute the sample solution proportionally, and then measuring the ion concentration in the diluted solution at different dilution ratios. By directly utilizing multiple first and second tubes in conjunction, the sample solution is continuously diluted proportionally multiple times, greatly simplifying the manual operation steps in the dilution sampling process. This reduces the manpower input in the liquid ion analysis process and significantly reduces systematic errors caused by human operation during sampling, thereby improving the precision and accuracy of the measurement results. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the first tube provided in an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of the second tube provided in an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the sampling device provided in an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached drawings: 1. First sub-pipe; 2. Second sub-pipe; 3. First mating pipe; 4. Second mating pipe; 5. Barrier component; 6. Separator component; 7. Isolation component; 8. Sealing component. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1

[0038] like Figures 1 to 3 The diagram shows a sampling device provided in this embodiment, comprising a first tube and a second tube. The sampling device is designed to fit the shape of an autosampler in an inductively coupled plasma optical emission spectrometer (ICP-OES) with an autosampler. The ICP-OES can be an ICP-MS or other similar device. Both the first and second tubes are made of polytetrafluoroethylene (PTFE), which is resistant to acids and alkalis. Both the first and second tubes are transparent.

[0039] The first pipe body has an open end and a baffle plate (5) serving as a baffle element at the other end. The baffle plate 5 has a first liquid passage. A partition plate (6) serving as a separator is located inside the cavity of the first pipe body, and the partition plate 6 has a second liquid passage. The second pipe body includes a first mating pipe 3 and a second mating pipe 4. A partition plate (7) serving as an isolation element is located between the first mating pipe 3 and the second mating pipe 4, and the partition plate 7 has a third liquid passage. A sealing plate (8) serving as a sealing element is located at the end of the second mating pipe 4 away from the first mating pipe 3, and the sealing plate 8 has a fourth liquid passage. The first mating pipe 3 is adapted to be sealed with the end of the first pipe body with the baffle element 5, and the second mating pipe 4 is adapted to be sealed with the open end of the first pipe body. When the first mating pipe 3 is mated with the first pipe body, it has a first state in which the first liquid passage and the third liquid passage are aligned to allow the first mating pipe 3 to communicate with the first pipe body, and a second state in which both the first liquid passage and the third liquid passage are closed to completely isolate the first mating pipe 3 from the first pipe body. When the second fitting tube 4 is fitted with the first tube body, it has a third state in which the second liquid outlet and the fourth liquid outlet are aligned with each other to allow the second fitting tube 4 to communicate with the first tube body, and a fourth state in which both the second liquid outlet and the fourth liquid outlet are closed to completely isolate the second fitting tube 4 from the first tube body.

[0040] Specifically, the first fitting pipe 3 is threadedly engaged with the end of the first pipe body where the baffle 5 is located, and the second fitting pipe 4 is threadedly engaged with the open end of the first pipe body. To facilitate control of the liquid flow velocity between the first and second pipe bodies, in this embodiment, the first, second, third, and fourth liquid outlets are all fan-shaped openings. The open end of the first pipe body has an internal thread, and the other end has an external thread. The first fitting pipe 3 of the second pipe body has an internal thread, and the second fitting pipe 4 of the second pipe body has an external thread. The internal thread on the first pipe body is adapted to engage with the external thread on the second fitting pipe 4, and the external thread on the first pipe body is adapted to engage with the internal thread on the first fitting pipe 3. In other embodiments, the shapes of the first, second, third, and fourth liquid outlets can also be circular, arbitrary polygonal, or other geometric shapes, as long as the solution can pass through.

[0041] To facilitate control of the solution flow rate, the number of first, second, third, and fourth liquid outlets is always even, and the multiple first outlets, second outlets, third outlets, or fourth outlets are arranged in a centrally symmetrical manner. In this embodiment, the first, second, third, and fourth liquid outlets are all arranged in pairs.

[0042] In this embodiment, the divider 5 separates the first tube into a first sub-tube 1 and a second sub-tube 2, with a volume ratio of 9:1 between the first sub-tube 1 and the second sub-tube 2. Specifically, the total volume of the first tube is 10 mL, the first sub-tube 1 is 9 mL, and the second sub-tube 2 is 1 mL. By repeating the dilution operation, diluted solutions of the sample solution can be obtained at 10-fold, 100-fold, 1000-fold, 10000-fold, and 100000-fold, and so on. Moreover, this method is a strictly volume-limited stepwise dilution, eliminating dilution errors caused by operation. The dilution factor can increase in increments of 10-fold, or in increments of 2, 3, 5, or other factors as needed, simply by adjusting the volumes of the first and second tubes accordingly.

[0043] To seal both ends of the first tube, the sampling device also includes a third tube, which is open at one end and completely closed at the other. The third tube is provided with internal and external threads, which can engage with the internal thread at the open end of the first tube to seal the open end of the first tube, and can also engage with the external thread at the other end of the first tube to seal the other end of the first tube.

[0044] When diluting and sampling the sample solution, first take a first tube and a second tube. Connect the first fitting tube 3 of the second tube to the open end of the first tube, and put the first tube and the second tube in a second state. Add diluent into the first tube from the open end until the liquid level reaches the separator 6. Continue to add sample solution into the first tube until the liquid level is flush with the open end of the first tube. Mix the sample solution and diluent evenly to obtain the initial diluted solution. Then take another first tube and another second tube, connect the first fitting tube 3 of the second tube to the open end of the first tube, and put the second tube and the second tube in the second state. Add diluent to the other tube until the liquid level reaches its separator 6. Connect the open end of the other first tube to the second fitting tube 4 of the first second tube, and put the second tube and the first second tube in the third state. Adjust the first first tube and the first second tube to the first state. Add the solution in the first first tube to the second first tube until the liquid level is flush with the open end of the second first tube. Adjust the first first tube and the first second tube to the second state. Mix the solution in the second first tube evenly to obtain a re-diluted solution. Repeat the above steps to obtain re-diluted solutions with different dilution ratios. The sampling process eliminates the need for multiple samplings of the sample solution. By using multiple first and second tubes in combination, the sample solution can be continuously diluted in equal proportions multiple times. This greatly simplifies the manual operation steps in the dilution sampling process, significantly reduces systematic errors caused by human operation during sampling, and improves the precision and accuracy of the measurement results.

[0045] Example 2

[0046] This embodiment provides a liquid ion analysis method, using the sampling device described in Embodiment 1. The method includes the following steps:

[0047] First, take a first tube and a second tube. Connect the first fitting tube of the second tube to the open end of the first tube, and put the first and second tubes in a second state. Add diluent into the first tube from the open end until the liquid level reaches the separator. Continue to add sample solution into the first tube until the liquid level is flush with the open end of the first tube. Mix the sample solution and diluent evenly to obtain the initial diluted solution.

[0048] Then, take another first tube and another second tube, connect the first fitting tube of the second tube to the open end of the first tube, and put the second tube and the second tube in a second state. Add diluent to the other tube until the liquid level reaches its separator. Connect the open end of the other first tube to the second fitting tube of the first second tube, and put the second tube and the first second tube in a third state. Adjust the first first tube and the first second tube to a first state. Add the solution in the first first tube to the second first tube until the liquid level is flush with the open end of the second first tube. Adjust the first first tube and the first second tube to a second state. Mix the solution in the second first tube evenly to obtain a re-diluted solution. Repeat the above steps to obtain re-diluted solutions with different dilution ratios.

[0049] Finally, the ion concentrations in the initial diluted solution and multiple subsequent diluted solutions were measured.

[0050] The step of mixing the sample solution and diluent uniformly includes: sealing the open end of the first tube and shaking the first tube. Shaking the first tube involves manually turning it up and down at least 30 times or using a mixer to agitate the first tube for at least 10 seconds. When measuring ion concentration, the end of the first tube with the baffle is closed, and all first tubes are placed in the spectrometer's autosampler. The spectrometer is then used to measure the liquid ion concentration data in each first tube.

[0051] Multiple sets of first and second tubes are combined to form a dilution kit. During dilution, firstly, take the first set of first and second tubes, align the divider and separator to seal the bottom of the first tube, then add 9 mL of deionized water (to the level of the separator) as the diluent. Next, add 1 mL of the sample solution to be tested, cap the open end of the first tube, and mix well. Then, screw on the second set of first and second tubes below the first set of second tubes. The second set of first tubes already contains 9 mL of deionized water, and its bottom is sealed using the second set of second tubes. Tighten the external thread on the sealing element of the first set of second tubes to the internal thread on the separator of the second set of first tubes. After sealing the separator and sealing element of the second set of second tubes, rotate the first set of first and second tubes to connect the bottom of the first tube to the second tube, allowing 1 mL of a 10-fold diluted solution to enter the first fitting tube of the first set of second tubes. Next, seal the partition and separator between the first and second tubes of the first group, and open the liquid passage between the sealing piece on the second tube and the separator on the first tube. At this point, the first tube of the second group contains 1 mL of the sample diluted 10 times and 9 mL of deionized water. Then, remove the first and second tubes of the first group, screw the cap back on the first tube of the second group, and repeat the above steps to mix thoroughly. Repeating the above dilution operation will yield diluted solutions of 10, 100, 1000, 10000, and 100000 times, and so on. This method is a strictly volume-limited stepwise dilution, eliminating dilution errors caused by operational factors. The dilution factor can increase in increments of 10 times, or in increments of 2, 3, 5, etc., as needed, simply by adjusting the volumes of the first and second tubes accordingly.

[0052] By passing samples at different dilution ratios through an autosampler, data measured at different dilution ratios can be obtained. After restoring these data according to the dilution ratio, a table of n (number of samples) * m (number of ions measured) can be obtained.

[0053] Import the form along with the model of the emission spectrometer (e.g., ICP-OES or ICP-MS) into the program. The program will automatically adjust the form data according to the detection limits and accurate measurement ranges of different ions for that model of equipment, and then export accurate ion concentration data. For example, if the potassium ion concentration in the solution is 17540 ppm, and the accurate measurement range is 0.1–1 ppm, the data would be as follows:

[0054]

[0055]

[0056] The program will automatically determine that the 0.17 ppm obtained after dilution by 100,000 times falls within the accurate measurement range, and thus select 17,540 ppm as the final potassium ion concentration. After performing the above judgment on all ion data, the program will provide the final ion concentration.

[0057] The sampling device described in this invention is used to measure the ion concentration in diluted solutions at different dilution ratios after multiple proportional dilutions of the sample solution. By directly utilizing multiple first and second tubes in conjunction, the sample solution is continuously diluted multiple times proportionally, greatly simplifying the manual operation steps in the dilution sampling process. This reduces the manpower required in liquid ion analysis processes and significantly reduces systematic errors caused by human operation during sampling, thereby improving the precision and accuracy of the measurement results.

[0058] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A sampling device, characterized in that, include: The first tube has an open end and a baffle (5) at the other end. The baffle (5) has a first liquid outlet. The first tube has a partition (6) in its inner cavity and a second liquid outlet on the partition (6). The second tube body includes a first fitting tube (3) and a second fitting tube (4). An isolation element (7) is provided between the first fitting tube (3) and the second fitting tube (4). A third liquid outlet is provided on the isolation element (7). A sealing element (8) is provided at the end of the second fitting tube (4) away from the first fitting tube (3). A fourth liquid outlet is provided on the sealing element (8). The first fitting tube (3) is adapted to be sealed to the end of the first tube body where the barrier (5) is provided, and the second fitting tube (4) is adapted to be sealed to the open end of the first tube body; When the first fitting tube (3) is fitted with the first tube body, it has a first state in which the first liquid outlet and the third liquid outlet are aligned with each other so that the first fitting tube (3) is connected to the first tube body, and a second state in which the first liquid outlet and the third liquid outlet are both closed so that the first fitting tube (3) is completely isolated from the first tube body. When the second fitting tube (4) is fitted with the first tube body, it has a third state in which the second liquid outlet and the fourth liquid outlet are aligned with each other so that the second fitting tube (4) is connected to the first tube body, and a fourth state in which the second liquid outlet and the fourth liquid outlet are both closed so that the second fitting tube (4) is completely isolated from the first tube body.

2. The sampling device according to claim 1, characterized in that, The first liquid outlet and / or the second liquid outlet and / or the third liquid outlet and / or the fourth liquid outlet are fan-shaped openings.

3. The sampling device according to claim 2, characterized in that, The number of the first liquid outlet and / or the second liquid outlet and / or the third liquid outlet and / or the fourth liquid outlet is even, and the plurality of the first liquid outlets, the plurality of the second liquid outlets, the plurality of the third liquid outlets, or the plurality of the fourth liquid outlets are arranged in a centrally symmetrical manner.

4. The sampling device according to any one of claims 1 to 3, characterized in that, The baffle (5) divides the first tube into a first sub-tube (1) and a second sub-tube (2), with a volume ratio of 9:1 between the first sub-tube (1) and the second sub-tube (2).

5. The sampling device according to any one of claims 1 to 3, characterized in that, It also includes a third tube, which is open at one end and completely closed at the other end.

6. The sampling device according to any one of claims 1 to 3, characterized in that, The first fitting tube (3) is adapted to be threadedly fitted to one end of the first tube body where the guard (5) is provided, and the second fitting tube (4) is adapted to be threadedly fitted to the open end of the first tube body.

7. A liquid ion analysis method, characterized in that, The method, using the sampling device according to any one of claims 1 to 6, comprises the following steps: Take a first tube and a second tube, connect the first fitting tube (3) of the second tube to the end of the first tube with the grid (5), and put the first tube and the second tube in the second state; Add diluent from the open end of the first tube to the first tube until the liquid level reaches the separator (6), and continue to add sample solution to the first tube until the liquid level is flush with the open end of the first tube. Mix the sample solution and diluent evenly to obtain the first diluted solution. Take another first tube and another second tube, connect the first fitting tube (3) of the second tube to the end of the first tube with the partition (5), and put the first tube and the second tube in the second state. Add diluent to the other tube until the liquid level reaches its partition (6). Connect the open end of the first tube to the second fitting tube (4) of the first second tube, and put the first tube and the first second tube in the third state. Adjust the first tube and the first second tube to the first state. Add the solution in the first tube to the second tube until the liquid level is flush with the open end of the second tube. Adjust the first tube and the first second tube to the second state. Mix the solution in the second tube evenly to obtain a re-diluted solution. Repeat the above steps to obtain re-diluted solutions with different dilution ratios. The ion concentrations in the initial diluted solution and multiple subsequent diluted solutions were measured.

8. The liquid ion analysis method according to claim 7, characterized in that, The steps of mixing the sample solution and the diluent uniformly include: sealing the open end of the first tube and shaking the first tube.

9. The liquid ion analysis method according to claim 8, characterized in that, The steps for shaking the first tube are as follows: manually flip the first tube up and down at least 30 times or use a mixer to vibrate the first tube for at least 10 seconds.

10. The liquid ion analysis method according to any one of claims 7 to 9, characterized in that, During ion concentration measurement, the end of the first tube with the baffle is closed, and all the first tubes are placed in the spectrometer autosampler. The spectrometer is then used to measure the liquid ion concentration data in each first tube.

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