Method for preparing and testing standard sample of dissolved hydrogen in water

Abstract

The invention relates to the technical field of standard sample preparation, in particular to a water dissolved hydrogen standard sample preparation and test method, which comprises the following steps: S1, respectively conveying pure water with required volume and hydrogen with required concentration into a tank body, and uniformly mixing to prepare a water dissolved hydrogen sample solution; s2, taking out a certain volume of the dissolved hydrogen sample solution in water, carrying out degassing treatment, introducing the removed hydrogen into a gas chromatograph, testing, and recording a peak height signal value M; s3, the initial content N of the dissolved hydrogen in the water and the concentration Y of the dissolved hydrogen in the standard water are calculated according to a theoretical formula, a corrected curve equation Y = kN + b is obtained through linear fitting calculation by combining the peak height signal value M, k is the slope, and b is the value of Y when N is equal to 0; and S4, repeating the steps S2 and S3, and substituting the calculated initial content N of the dissolved hydrogen in the water into the correction curve equation to obtain the concentration of the dissolved hydrogen in the sample water to be detected. The preparation method has the effect of conveniently preparing the dissolved hydrogen standard sample in water.

Description

Technical Field

[0001] The present application relates to the technical field of standard sample preparation, and in particular to a method for preparing and testing a standard sample of dissolved hydrogen in water. Background Art

[0002] At present, the integrity of the generator cooling water circuit is crucial to ensure the safe and stable operation of the generator set. Monitoring the dissolved hydrogen content in the cooling water is an important means to evaluate whether there is leakage in the generator cooling water system. During the test of the dissolved hydrogen content in the generator cooling water, a standard sample of dissolved hydrogen in water is required to verify the reliability and accuracy of the generator cooling water monitoring system. In addition, in order to ensure the accuracy of the monitoring results, it is also necessary to conduct an offline comparison test between the generator cooling water monitoring system and the laboratory gas chromatography instrument. When conducting the comparison test, it is necessary to ensure that the sample preparation and analysis process complies with the standard operating procedures to ensure the consistency and comparability of the test results. However, there are currently no standard samples of dissolved hydrogen in water on the market, and the relevant standards and specifications lack instructions on the preparation method of standard samples of dissolved hydrogen in water.

[0003] Therefore, there is an urgent need for a method for preparing and testing a standard sample of dissolved hydrogen in water. Summary of the invention

[0004] In order to facilitate the preparation of a standard sample of dissolved hydrogen in water, the present application provides a method for preparing and testing a standard sample of dissolved hydrogen in water.

[0005] The present application provides a method for preparing and testing a standard sample of dissolved hydrogen in water, which adopts the following technical solution: A method for preparing and testing a standard sample of dissolved hydrogen in water, comprising: S1, according to the preset concentration of the sample solution, the required volume of pure water and the required concentration of hydrogen are respectively transported into the tank and evenly mixed to prepare a sample solution of dissolved hydrogen in water; S2, taking out a certain volume of a sample solution of hydrogen dissolved in water, degassing the sample solution of hydrogen dissolved in water, passing the degassed hydrogen into a gas chromatograph for testing, and recording a peak height signal value M; S3, calculate the preliminary content N of dissolved hydrogen in water and the concentration Y of dissolved hydrogen in standard water according to the theoretical formula, and combine the peak height signal value M, and obtain the correction curve equation Y=kN+b through linear fitting calculation, where k is the slope and b is the value of Y when N=0; S4, repeating steps S2 and S3, and substituting the calculated preliminary content N of dissolved hydrogen in water into the correction curve equation, the dissolved hydrogen concentration in the sample water to be tested can be obtained.

[0006] By adopting the above technical solution, the required volume of pure water and the required concentration of hydrogen are respectively transported into the tank and evenly mixed, so as to accurately prepare the required concentration of dissolved hydrogen sample solution in water. And by establishing a correction curve equation, when it is necessary to test a dissolved hydrogen sample in water with an unknown concentration, the dissolved hydrogen concentration in water can be quickly calculated, thereby effectively improving the accuracy and reliability of the dissolved hydrogen concentration test in water.

[0007] Optionally, in S2, the specific steps are as follows: S21, providing a sampling needle tube, and taking out a certain volume of a sample solution of dissolved hydrogen in water from the tank body by using the sampling needle tube; S22, performing gas-liquid separation on the sample solution of dissolved hydrogen in water in the sampling needle tube to separate the hydrogen in the water; S23, provide a gas sampling needle tube, transfer all the hydrogen separated in the sampling needle tube into the gas sampling needle tube, let it stand for a while, determine the gas volume by reading the scale on the gas sampling needle tube, and then transfer the hydrogen in the gas sampling needle tube to the gas chromatograph for testing, and record the peak height signal value M.

[0008] By adopting the above technical solution, a certain volume of dissolved hydrogen sample solution in water is accurately taken out from the tank body by using a sampling needle, and the hydrogen in the water is effectively separated by gas-liquid separation, and then all the separated hydrogen is transported to the gas sampling needle, and the gas volume is read by standing, thereby ensuring the accuracy of hydrogen volume measurement. Furthermore, the hydrogen in the gas sampling needle is transported to a gas chromatograph for testing, and the peak height signal value M is recorded, thereby significantly improving the accuracy and reliability of the dissolved hydrogen concentration test in water.

[0009] Optionally, in S23, the specific steps are as follows: S231, connect the sampling needle tube and the gas extraction needle tube with a double-ended needle, place the sampling needle tube vertically, and place the sampling needle tube below the gas extraction needle tube, and then press down the sampling needle tube so that all the hydrogen in the sampling needle tube is squeezed into the gas extraction needle tube; S232, separate the sampling needle tube and the gas extraction needle tube, stand the gas extraction needle tube upright and invert it, wait for a period of time, read the scale on the gas extraction needle tube to determine the gas volume; S233, transporting the hydrogen in the gas sampling needle tube to the gas chromatograph for testing, and recording the peak height signal value M.

[0010] By adopting the above technical solution, the sampling needle tube and the gas extraction needle tube are connected by a double-ended needle to ensure that the hydrogen in the sampling needle tube is completely transferred to the gas extraction needle tube, thereby avoiding the loss of hydrogen and improving the accuracy of the test. The gas extraction needle tube is vertically and inverted, and left to stand for a period of time to ensure that the hydrogen is fully stable, which is convenient for accurately reading the gas volume and further improving the reliability of the test results. In addition, the hydrogen in the gas extraction needle tube is transported to the gas chromatograph for testing, and the peak height signal value M is recorded. Through these steps, the content of dissolved hydrogen in water can be effectively obtained, providing reliable data support for subsequent linear fitting calculations.

[0011] Optionally, in S3, the theoretical formula is: ; ; in, is the volume of hydrogen released after the sample solution of dissolved hydrogen in water is degassed. is the volume of the sample solution of dissolved hydrogen in water.

[0012] Optionally, in S1, the specific steps are as follows: S11, cleaning the tank body with pure water, and then filling the tank body with a required volume of pure water; S12, using a vacuum pump to evacuate the tank; S13, introducing a certain concentration of hydrogen into the tank body so that the pressure inside the tank body reaches a specified value and the hydrogen and pure water are fully mixed.

[0013] By adopting the above technical solution, the cleanliness of the pure water in the tank is ensured and oxygen and other impurities in the air are removed, so that in the subsequent process of introducing hydrogen, the concentration of hydrogen in the tank can be accurately controlled, so that the prepared sample solution of dissolved hydrogen in water has high accuracy and stability, thereby improving the reliability and accuracy of the test results.

[0014] Optionally, in S1, the tank body is connected to a water circulation pipe, one end of the water circulation pipe is connected to the bottom of the tank body, and the other end of the water circulation pipe is connected to the top of the tank body, a circulation pump is provided on the water circulation pipe, the top of the tank body is connected to a ventilation pipe, the bottom of the tank body is connected to a sampling pipe, and valves are respectively provided on the ventilation pipe and the sampling pipe.

[0015] By adopting the above technical solution, by connecting the water circulation pipeline on the tank body and arranging a circulation pump on the water circulation pipeline, the pure water in the tank body can flow in the tank body through the water circulation pipeline, thereby effectively promoting the mixing of pure water and hydrogen in the tank body and improving the uniformity of dissolved hydrogen in the water. In addition, valves are respectively arranged on the ventilation pipeline connected to the top of the tank body and the sampling pipeline connected to the bottom, so as to facilitate the control of the introduction of hydrogen and the removal of water samples, thereby ensuring the accuracy and reliability of the experimental operation.

[0016] Optionally, a liquid level monitoring component is provided on the tank body, and the liquid level monitoring component is used to detect the liquid level in the tank body.

[0017] By adopting the above technical solution, the liquid level monitoring component arranged on the tank body can detect the liquid level in the tank body in real time, ensuring the accuracy of the liquid level during the preparation of the dissolved hydrogen sample solution in water, thereby improving the accuracy and reliability of the preparation of the dissolved hydrogen sample solution in water.

[0018] Optionally, a pressure regulating component is provided on the tank body, and the pressure regulating component is used to regulate the pressure inside the tank body.

[0019] By adopting the above technical solution, the pressure regulating component can adjust the pressure inside the tank body so that the pressure inside the tank body is maintained within a set range, which is conducive to avoiding uneven dissolution or escape of hydrogen due to pressure fluctuations, thereby ensuring the uniformity and consistency of the sample solution.

[0020] Optionally, the pressure regulating assembly includes a pressure regulating plate and a driving member, wherein the pressure regulating plate is movably disposed in the tank body and is in contact with the inner wall of the tank body, and the driving member is disposed on the tank body and connected to the pressure regulating plate, and the driving member is used to drive the pressure regulating plate to move so as to adjust the pressure on both sides of the pressure regulating plate.

[0021] By adopting the above technical solution, the driving member can drive the pressure regulating plate to move, so as to use the pressure regulating plate to adjust the pressure inside the tank body, thereby facilitating the adjustment of the pressure inside the tank body according to needs, ensuring that the hydrogen and pure water in the tank body are fully mixed while maintaining a stable pressure environment in the tank body, and to a certain extent reducing the possibility of pressure fluctuations in the tank body due to the solution in the tank body being taken out, which is beneficial to avoid the possibility of changes in the degree of mixing of hydrogen and pure water due to pressure fluctuations, and to a certain extent improving the controllability and accuracy of the preparation process of the dissolved hydrogen sample solution in water.

[0022] Optionally, the pressure regulating assembly includes a detection member, which is disposed on a side of the pressure regulating plate close to the bottom of the tank body, and is used to detect the pressure in the tank body.

[0023] By adopting the above technical solution, the setting of the detection component can detect the pressure changes inside the tank, which is beneficial to improve the accuracy and stability of pressure regulation. This helps to ensure the full mixing of hydrogen and pure water when preparing standard samples of dissolved hydrogen in water, thereby improving the uniformity and stability of the samples.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. By providing a reliable method for preparing standard samples of dissolved hydrogen in water, the problem of lack of standard samples of dissolved hydrogen in water in the prior art is solved, ensuring the reliability and accuracy verification of the generator cooling water monitoring system; 2. Through the cooperation of the pressure regulating plate, the driving part and the detecting part, the detecting part can detect the pressure change inside the tank body, so that the driving part can accurately adjust the position of the pressure regulating plate, thereby facilitating the adjustment of the pressure inside the tank body according to the needs, so as to ensure that the hydrogen and pure water in the tank body are fully mixed while maintaining a stable pressure environment in the tank body, which to a certain extent reduces the possibility of pressure fluctuations in the tank body due to the removal of the solution in the tank body, and thus helps to avoid the possibility of changes in the degree of mixing of hydrogen and pure water due to pressure fluctuations, so as to improve the controllability and accuracy of the preparation process of the dissolved hydrogen sample solution in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of a method for preparing and testing a standard sample of dissolved hydrogen in water in Example 1 of the present application.

[0026] Figure 2 It is a schematic diagram of the structure of the tank body, water circulation pipeline and circulation pump in Example 1 of the present application.

[0027] Figure 3 It is the working curve used for the test of the standard sample of dissolved hydrogen in water in Example 1 of the present application, wherein the y-axis is the concentration of the standard sample of dissolved hydrogen in water, and the x-axis is the initial content of dissolved hydrogen in water.

[0028] Figure 4 It is a structural schematic diagram of the tank body and the pressure regulating assembly in Example 2 of the present application.

[0029] Description of reference numerals: 1. Tank body; 11. Ventilation pipe; 12. Sampling pipe; 13. Valve; 14. Pressure gauge; 15. Liquid level monitoring component; 2. Water circulation pipe; 3. Circulation pump; 4. Pressure regulating assembly; 41. Pressure regulating plate; 42. Driving component; 43. Detection component. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The present application discloses a method for preparing and testing a standard sample of dissolved hydrogen in water.

[0032] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] Example 1: Reference Figure 1 and Figure 2 , a method for preparing and testing a standard sample of dissolved hydrogen in water includes: S1, according to the preset concentration of the sample solution, the required volume of pure water and the required concentration of hydrogen are respectively transported into the tank body 1 and evenly mixed to prepare a sample solution of dissolved hydrogen in water. The tank body 1 is connected with a water circulation pipeline 2, one end of which is connected to the bottom of the tank body 1, and the other end of which is connected to the top of the tank body 1. A circulation pump 3 is arranged on the water circulation pipeline 2, and a ventilation pipeline 11 is connected to the top of the tank body 1, and a sampling pipeline 12 is connected to the bottom of the tank body 1. Valves 13 are arranged on the ventilation pipeline 11 and the sampling pipeline 12, respectively.

[0034] A pressure gauge 14 is installed on the top of the tank body 1, and the pressure gauge 14 is used to detect the pressure in the tank body 1, and a liquid level monitoring component 15 is provided on the tank body 1. In this embodiment, the liquid level monitoring component 15 is a liquid level monitoring pipeline, and the liquid level monitoring component 15 is connected to the tank body 1, so that the liquid level in the tank body 1 is flush with the liquid level in the liquid level monitoring component 15, so as to facilitate real-time monitoring of the liquid level in the tank body 1. Then the specific steps of S1 are as follows: S11, pure water is filled into the tank body 1, and then the circulation pump 3 is started. The circulation pump 3 drives the pure water to circulate in the tank body 1 to clean the tank body 1. After the cleaning is completed, the waste water is discharged from the tank body 1 through the sampling pipe 12, so as to ensure that the inside of the tank body 1 is clean and free of impurities. Then new pure water is filled into the tank body 1, so that the liquid level of the pure water reaches 65%-75% of the capacity of the tank body 1, specifically 70% of the capacity of the tank body 1. In this embodiment, the tank body 1 adopts a 5L stainless steel tank body.

[0035] S12, connect the vacuum pump to the ventilation pipe 11, so as to use the vacuum pump to extract the gas in the tank body 1, so that the internal pressure of the tank body 1 drops below -10kPa, and then close the valve 13 on the ventilation pipe 11 to stop the vacuum pump. In this embodiment, the vacuum pump can be a rotary diaphragm vacuum pump to ensure the vacuum effect.

[0036] S13, separate the vacuum pump from the ventilation pipe 11, connect the ventilation pipe 11 to the hydrogen bottle, and then open the valve 13 on the ventilation pipe 11 to fill a certain concentration of hydrogen into the tank body 1, so that the pressure in the tank body 1 reaches 100kPa. Then turn on the circulation pump 3, and the circulation pump 3 drives the pure water to circulate in the tank body 1 to fully mix the pure water and hydrogen. Specifically, after the circulation pump 3 is turned on, the pure water is first circulated in the tank body 1 for 2 hours, and then circulated again for 2 hours after stopping for 30 minutes to ensure that the hydrogen and pure water are fully mixed, so as to achieve the preparation of the standard sample of dissolved hydrogen in water.

[0037] S2, after the prepared standard sample of dissolved hydrogen in water is left to stand for 1 hour, a certain volume of the sample solution of dissolved hydrogen in water is taken out, the sample solution of dissolved hydrogen in water is degassed, and the degassed hydrogen is passed into a gas chromatograph for testing, and the peak height signal value M is recorded. The specific steps are as follows: S21, providing a sampling needle, the sampling needle takes out a certain volume of a sample solution of dissolved hydrogen in water from the tank body 1 through the sampling pipe 12; S22, placing the sampling needle into the gas-liquid separation device, in this embodiment, the gas-liquid separation device uses an oscillator, so that the hydrogen in the water-dissolved hydrogen sample solution can be separated by oscillation. In other embodiments, a low-temperature separation method can also be used to separate the hydrogen in the water-dissolved hydrogen sample solution.

[0038] S23, provide a gas sampling needle tube, transfer all the hydrogen separated in the sampling needle tube to the gas sampling needle tube, let it stand for a period of time, determine the gas volume by reading the scale on the gas sampling needle tube, and then transfer the hydrogen in the gas sampling needle tube to the gas chromatograph for testing, and record the peak height signal value M. The specific steps are as follows: S231, connect the sampling needle tube and the gas extraction needle tube with a double-ended needle, and place the sampling needle tube vertically, with the sampling needle tube below the gas extraction needle tube, and then press the sampling needle tube downward so that all the hydrogen in the sampling needle tube is squeezed into the gas extraction needle tube. At this time, the sample solution of hydrogen dissolved in water in the sampling needle tube does not enter the gas extraction needle tube.

[0039] S232, separate the sampling needle tube and the gas extraction needle tube, and vertically and invert the gas extraction needle tube. At this time, the needle of the gas extraction needle tube faces upward, and after standing for two minutes, read the scale on the gas extraction needle tube to determine the gas volume.

[0040] S233, transport the hydrogen in the gas sampling needle tube to the gas chromatograph for testing, repeat the above operation 2-3 times, and record the peak height signal value M.

[0041] S3, according to the theoretical formula, calculate the initial content N of dissolved hydrogen in water and the concentration Y of dissolved hydrogen in standard water. Then in S3, the theoretical formula is: ; ; in, is the volume of hydrogen released after the sample solution of dissolved hydrogen in water is degassed. is the volume of the sample solution of dissolved hydrogen in water.

[0042] Reference Figure 1 and Figure 3 , combined with the peak height signal value M, after linear fitting calculation, the correction curve equation Y=kN+b is obtained. Wherein k is the slope, and b is the value of Y when N=0. In this embodiment, a specific detection data disclosed is shown in Table 1 below: Table 1 Hydrogen concentration detection data C-Hydrogen concentration in water ppm Y-Concentration of standard sample of dissolved hydrogen in water ul / L N-Preliminary content of dissolved hydrogen in water ul / L 1000 17.46 36.61 4000 69.83 140.07 10000 174.59 299 20000 349.17 455.5 40000 698.34 963.48 S4, when it is necessary to test the next sample of dissolved hydrogen in water with unknown concentration, repeat the above steps S2 and S3, and substitute the calculated preliminary content N of dissolved hydrogen in water into the correction curve equation to obtain the dissolved hydrogen concentration in the sample water to be tested.

[0043] Example 2: Reference Figure 4 The difference between this embodiment and embodiment 1 is that a pressure regulating component 4 is provided on the tank body 1.

[0044] The pressure regulating assembly 4 includes a pressure regulating plate 41, a driving member 42 and a detection member 43. The pressure regulating plate 41 is movably arranged in the tank body 1 and is in contact with the inner wall of the tank body 1, and the driving member 42 is installed on the tank body 1 and connected to the pressure regulating plate 41. In this embodiment, the driving member 42 is configured as an electric push rod, so that the driving member 42 is used to drive the pressure regulating plate 41 to move in the tank body 1.

[0045] In other embodiments, the driving member 42 includes an air pump and a vacuum pump, and the air pump and the vacuum pump are respectively connected to the top of the tank body 1. When it is necessary to drive the pressure regulating plate 41 to move toward the bottom of the tank body 1, the air pump works to deliver gas into the tank body 1, so that the pressure at the top of the tank body 1 is greater than the pressure at the bottom of the tank body 1, thereby driving the pressure regulating plate 41 to move toward the bottom of the tank body 1. And when it is necessary to drive the pressure regulating plate 41 to move toward the top of the tank body 1, the vacuum pump works to make the pressure at the top of the tank body 1 less than the pressure at the bottom of the tank body 1, thereby driving the pressure regulating plate 41 to move toward the top of the tank body 1.

[0046] The detection member 43 is disposed on one side of the pressure regulating plate 41 close to the bottom of the tank body 1. In this embodiment, the detection member 43 is a pressure sensor, so that the pressure in the tank body 1 can be detected by the detection member 43.

[0047] The implementation principle of Example 2 is as follows: when a portion of the sample solution of dissolved hydrogen in water in the tank body 1 is taken out, the detection member 43 detects that the pressure in the tank body 1 has changed. At this time, the driving member 42 works to drive the pressure regulating plate 41 to move toward the bottom of the tank body 1, so that the pressure of the portion of the tank body 1 storing the sample solution of dissolved hydrogen in water is maintained within a set range, thereby facilitating the avoidance of uneven dissolution or escape of hydrogen gas due to pressure fluctuations, thereby ensuring the uniformity and consistency of the sample solution.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing and testing a standard sample of dissolved hydrogen in water, characterized in that: include: S1, according to the preset concentration of the sample solution, a required volume of pure water and a required concentration of hydrogen are respectively transported into the tank (1) and evenly mixed to prepare a sample solution of dissolved hydrogen in water; S2, taking out a certain volume of a sample solution of hydrogen dissolved in water, degassing the sample solution of hydrogen dissolved in water, passing the degassed hydrogen into a gas chromatograph for testing, and recording a peak height signal value M; S3, calculate the preliminary content N of dissolved hydrogen in water and the concentration Y of dissolved hydrogen in standard water according to the theoretical formula, and combine the peak height signal value M, and obtain the correction curve equation Y=kN+b through linear fitting calculation, where k is the slope and b is the value of Y when N=0; S4, repeating steps S2 and S3, and substituting the calculated preliminary content N of dissolved hydrogen in water into the correction curve equation, the dissolved hydrogen concentration in the sample water to be tested can be obtained.

2. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 1, characterized in that: In S2, the specific steps are as follows: S21, providing a sampling needle, and taking a certain volume of a sample solution of dissolved hydrogen in water from the tank (1) using the sampling needle; S22, performing gas-liquid separation on the sample solution of dissolved hydrogen in water in the sampling needle tube to separate the hydrogen in the water; S23, provide a gas sampling needle tube, transfer all the hydrogen separated in the sampling needle tube into the gas sampling needle tube, let it stand for a while, determine the gas volume by reading the scale on the gas sampling needle tube, and then transfer the hydrogen in the gas sampling needle tube to the gas chromatograph for testing, and record the peak height signal value M.

3. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 2, characterized in that: In S23, the specific steps are as follows: S231, connect the sampling needle tube and the gas extraction needle tube with a double-ended needle, place the sampling needle tube vertically, and place the sampling needle tube below the gas extraction needle tube, and then press down the sampling needle tube so that all the hydrogen in the sampling needle tube is squeezed into the gas extraction needle tube; S232, separate the sampling needle tube and the gas extraction needle tube, stand the gas extraction needle tube upright and invert it, wait for a period of time, read the scale on the gas extraction needle tube to determine the gas volume; S233, transporting the hydrogen in the gas sampling needle tube to the gas chromatograph for testing, and recording the peak height signal value M.

4. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 1, characterized in that: In S3, the theoretical formula is: ； ； in, is the volume of hydrogen released after the sample solution of dissolved hydrogen in water is degassed. is the volume of the sample solution of dissolved hydrogen in water.

5. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 1, characterized in that: In S1, the specific steps are as follows: S11, cleaning the tank body (1) with pure water, and then filling the tank body (1) with a required volume of pure water; S12, using a vacuum pump to evacuate the inside of the tank (1); S13, introducing hydrogen gas of a certain concentration into the tank body (1) so that the pressure in the tank body (1) reaches a specified value and the hydrogen gas and the pure water are fully mixed.

6. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 1, characterized in that: In S1, the tank body (1) is connected to a water circulation pipe (2), one end of the water circulation pipe (2) is connected to the bottom of the tank body (1), and the other end of the water circulation pipe (2) is connected to the top of the tank body (1), a circulation pump (3) is provided on the water circulation pipe (2), the top of the tank body (1) is connected to a ventilation pipe (11), and the bottom of the tank body (1) is connected to a sampling pipe (12), and valves (13) are provided on the ventilation pipe (11) and the sampling pipe (12), respectively.

7. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 6, characterized in that: The tank body (1) is provided with a liquid level monitoring component (15), and the liquid level monitoring component (15) is used to detect the liquid level in the tank body (1).

8. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 6, characterized in that: The tank body (1) is provided with a pressure regulating component (4), and the pressure regulating component (4) is used to regulate the pressure inside the tank body (1).

9. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 8, characterized in that: The pressure regulating assembly (4) comprises a pressure regulating plate (41) and a driving member (42); the pressure regulating plate (41) is movably arranged in the tank body (1) and is in contact with the inner wall of the tank body (1); the driving member (42) is arranged on the tank body (1) and is connected to the pressure regulating plate (41); the driving member (42) is used to drive the pressure regulating plate (41) to move so as to adjust the pressure on both sides of the pressure regulating plate (41).

10. The method for preparing and testing a standard sample of dissolved hydrogen in water according to claim 9, characterized in that: The pressure regulating assembly (4) comprises a detection member (43), wherein the detection member (43) is arranged on a side of the pressure regulating plate (41) close to the bottom of the tank body (1), and the detection member (43) is used to detect the pressure in the tank body (1).

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