A Purification System for Nitrogen and Xenon in Water and Its Isotope Static Analysis Method

Abstract

The present invention discloses a purification system for nitrogen and xenon in water and its isotope static analysis method, which includes a sample container, a dry ice cold trap, a gas delivery main pipe, and a rare gas mass spectrometer that are sequentially connected to the sample container. The gas delivery main pipe is provided with branch pipelines respectively connected to a cold pump and a vacuum pump group. The rare gas mass spectrometer is connected to the vacuum pump group. The cold pump adsorbs or releases nitrogen and / or xenon by setting different temperatures; a first valve and a second valve are respectively arranged on the inlet side and the outlet side of the dry ice cold trap. A fourth valve and a fifth valve are respectively arranged between the gas delivery main pipe and the vacuum pump group and between the gas delivery main pipe and the cold pump. A seventh valve is arranged between the gas delivery main pipe and the rare gas mass spectrometer, and a ninth valve is arranged between the rare gas mass spectrometer and the vacuum pump group. The present invention can achieve the isotope static analysis of nitrogen and xenon in the same sample successively, and can save the sample consumption on the basis of ensuring the measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of isotope measurement in water, and in particular to a nitrogen and xenon purification system in water and an isotope static analysis method thereof. Background Art

[0002] Measuring nitrogen and xenon isotopes in ice cores can provide information about ancient ocean temperatures. However, ice cores are generally converted into water under experimental conditions, so a method that can measure nitrogen and xenon isotopes in water is needed to infer ancient ocean temperatures and thereby understand the process of global climate change.

[0003] At present, the method for analyzing nitrogen and xenon isotopes in water first uses negative pressure to extract nitrogen and xenon in the gas phase, and then divides the gas into two parts and obtains each isotope by the method of dynamic mass spectrometry. This method needs to divide the sample to be tested into two parts, each part measures an isotope (nitrogen or xenon), and since there is no complex purification process for the sample, dynamic measurement is required, and in order to ensure the accuracy of the measurement result, the requirement for the sample amount is relatively large, therefore, the sample utilization of the prior art is not high. In addition, ice cores are all collected in polar regions or mountains with high altitudes, and the samples are very precious, therefore, saving sample consumption is very important.

[0004] In the prior art, for the sample analysis method, firstly, a water sample with a valve seal is connected to the system (sample volume 700-1200g), and the system is first evacuated by a vacuum pump group consisting of a mechanical pump, a molecular pump, and an ion pump (not less than 1*10 - 7 Pa), and then pass through two cold traps at a time. One cold trap is at -196 degrees Celsius (liquid nitrogen is placed outside the cold trap) to absorb the gas released from the water, and the other cold trap is at -100 degrees Celsius to absorb the residual water in the gas. In this way, a dry gas sample can be obtained, and then the gas is divided into two parts, one for direct nitrogen isotope measurement, and the other for Xe isotope measurement after the active gas is adsorbed by the getter. The measurement method uses a stable isotope mass spectrometer for dynamic measurement.

[0005] The Chinese patent with the publication number of CN 112629984A discloses an isotope sample purification system, its method and application. The purification system successively includes a sample injection unit, a VOC trap, an adsorption trap group, a liquid nitrogen cold trap, a liquid nitrogen enrichment trap, a chromatographic column, a purification and re-enrichment trap, and a sample collection tube, which are connected in sequence through pipelines. The sample is introduced through the sample injection unit. The gas sample successively enters the VOC trap to remove water and VOC components. The carrier gas introduced into the second carrier gas supply pipeline sends the sample in the liquid nitrogen enrichment trap into the chromatographic column GC, and separation is carried out in the chromatographic column GC according to different retention times. This solution can effectively remove impurity gases in the isotope sample for the next mass spectrometry analysis. However, this solution can only obtain one isotope sample and perform mass spectrometry analysis, but does not give a method for measuring two isotopes successively in the same sample.

[0006] The Chinese patent with the publication number of CN 107063784A discloses an extraction and purification system for dissolved xenon in water and its extraction and purification method. The system includes a water sample release and dissolved gas extraction system, and a gas purification and separation system connected to the water sample release and dissolved gas extraction system. The specific steps are to bake the whole system to vacuum and degas; release the water sample and extract the gas; transfer the gas to a glass cold trap; transfer the gas to the purification system; further dry the precipitated gas; adsorb and remove active gases; separate xenon. Although the present invention can solve the problems of incomplete removal of water vapor and incomplete separation of xenon during the extraction and separation of xenon, it only separates xenon and does not disclose or record a technical solution for obtaining nitrogen and xenon successively in the same sample. Summary of the Invention

[0007] The purpose of the present invention is to provide a purification system for nitrogen and xenon in water and its isotope static analysis method to solve the problems existing in the above-mentioned prior art. A cold pump is provided in the system, and nitrogen and / or xenon are adsorbed or released by setting different temperatures of the cold pump. Valves at different positions in the system are used to control vacuum pumping and the flow directions of nitrogen and xenon, so as to successively perform isotope static analysis on nitrogen and xenon in the same sample, and save the sample usage while ensuring the measurement accuracy.

[0008] To achieve the above purpose, the present invention provides the following solutions:

[0009] The present invention provides a purification system for nitrogen and xenon in water, including a sample container, a dry ice cold trap, a gas delivery main pipe, and a noble gas mass spectrometer that are successively connected to the sample container. The gas delivery main pipe is provided with branch pipelines respectively connected to a cold pump and a vacuum pump group. The noble gas mass spectrometer is connected to the vacuum pump group. The cold pump adsorbs or releases nitrogen and / or xenon by setting different temperatures;

[0010] A first valve and a second valve are respectively arranged on the inlet side and the outlet side of the dry ice cold trap. A fourth valve and a fifth valve are respectively arranged between the gas delivery main pipe and the vacuum pump group and between the gas delivery main pipe and the cryopump. A seventh valve is arranged between the gas delivery main pipe and the noble gas mass spectrometer. A ninth valve is arranged between the noble gas mass spectrometer and the vacuum pump group.

[0011] Preferably, a molecular sieve for filtering water molecules is arranged between the first valve and the dry ice cold trap.

[0012] Preferably, a branch pipeline is arranged on the gas delivery main pipe to communicate with the CuO furnace, and a third valve is arranged between the CuO furnace and the gas delivery main pipe.

[0013] Preferably, a gas delivery branch pipe is arranged between the gas delivery main pipe and the noble gas mass spectrometer. The gas delivery branch pipe includes a nitrogen delivery branch pipe and a xenon delivery branch pipe arranged in parallel. The seventh valve is arranged on the nitrogen delivery branch pipe, and a sixth valve is arranged on the xenon delivery branch pipe.

[0014] Preferably, an adsorbent container and an eighth valve are sequentially arranged on the xenon delivery branch pipe between the sixth valve and the noble gas mass spectrometer.

[0015] The present invention also provides an isotope static analysis method, including the following steps:

[0016] Evacuate the system.

[0017] Introduce sample gas into the system, remove impurity water molecules, and adsorb nitrogen and xenon.

[0018] Extract other impurity gases with low boiling points in the system.

[0019] Increase the temperature of the adsorption device and make the temperature between the boiling point of nitrogen and the boiling point of xenon, release nitrogen, and introduce the nitrogen into the noble gas mass spectrometer for measurement.

[0020] Continue to increase the temperature of the adsorption device so that the temperature is higher than the boiling point of xenon, release xenon, and introduce the xenon into the noble gas mass spectrometer for measurement.

[0021] Preferably, before measurement after releasing nitrogen, use the CuO furnace to remove reducing gases including CO, CH 4 and the like.

[0022] Preferably, after the measurement of nitrogen is completed, use the vacuum pump group to pump away the measured nitrogen.

[0023] Preferably, before measuring xenon, use an adsorbent to adsorb active gases.

[0024] Preferably, when removing impurity water molecules, molecular sieves are used to filter the water molecules, and a dry ice cold trap is used to adsorb the water molecules passing through the molecular sieves.

[0025] The present invention has achieved the following technical effects compared with the prior art:

[0026] (1) A cold pump is provided in the system of the present invention. By setting different temperatures of the cold pump, nitrogen and / or xenon are adsorbed or released. The valves at different positions in the system are used to control the evacuation and the flow directions of nitrogen and xenon, so as to achieve static isotope analysis of nitrogen and xenon in the same sample successively, and the sample consumption can be saved on the basis of ensuring the measurement accuracy.

[0027] (2) Before the sample enters the dry ice cold trap, it first passes through the molecular sieve. By filtering the water molecules through the molecular sieve, the water molecules in the sample can be further removed, thereby reducing the influence of the water molecules on the measurement result and further improving the accuracy of the measurement result.

[0028] (3) By setting a CuO furnace in the present invention, reducing gases such as CO and CH 4 can be removed. On the one hand, the abundance of the gas to be measured is increased, and on the other hand, the interference of CO on the measurement of N 2 at the same peak position is reduced; during the reaction of CuO, water vapor and CO 2 gases are generated, and the water vapor and CO 2 gases can be adsorbed by the cold pump.

[0029] (4) An adsorbent is also provided on the pipeline where xenon leads to the noble gas mass spectrometer. The active gases can be adsorbed by the adsorbent, improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of the system of the present invention;

[0032] Among them, 1 is a sample container; 2 is a molecular sieve; 3 is a dry ice cold trap; 4 is a CuO furnace; 5 is a cold pump; 6 is an adsorbent container; 7 is a rare gas mass spectrometer; 8 is a vacuum pump group; 9 is a gas delivery main pipe; 11 is a first valve; 12 is a second valve; 13 is a third valve; 14 is a fourth valve; 15 is a fifth valve; 16 is a sixth valve; 17 is a seventh valve; 18 is an eighth valve; 19 is a ninth valve. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] The purpose of the present invention is to provide a purification system for nitrogen and xenon in water and its isotope static analysis method to solve the problems existing in the prior art. A cold pump is provided in the system, and by setting different temperatures of the cold pump, nitrogen and / or xenon can be adsorbed or released. The valves at different positions in the system are used to control vacuum pumping and the flow directions of nitrogen and xenon, so as to realize the isotope static analysis of nitrogen and xenon in the same sample successively, and the sample consumption can be saved while ensuring the measurement accuracy.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0036] As Figure 1 shown, the present invention provides a purification system for nitrogen and xenon in water, including a sample container 1, a dry ice cold trap 3, a gas delivery main pipe 9, and a rare gas mass spectrometer 7 that are sequentially connected to the sample container 1. The components that are interconnected are sealed reliably to prevent gas leakage or entry of impurity gases into the system. Among them, the sample container 1 is a container for holding the sample to be detected and can release the sample gas. The dry ice cold trap 3 can be a dry ice U-shaped tube made of stainless steel, with a sleeve cup outside, and dry ice can be added to the sleeve cup to reduce the internal temperature of the U-shaped tube to -56.6 °C, so as to adsorb water vapor molecules in the sample gas. The gas delivery main pipe 9 is a connecting pipeline, on which several three-way ports are provided for connecting devices such as a cold pump 5 and a vacuum pump group 8. Branch pipelines can be provided on the three-way ports to connect the cold pump 5 and the vacuum pump group 8 respectively. The vacuum pump group 8 can include a dry pump, a molecular pump, an ion pump, etc., and can pump to a certain vacuum degree (generally not less than 1*10 -7For Pa), the specific vacuum pumping process is a conventional technical means in the art and will not be elaborated here; the noble gas mass spectrometer 7 can be a Helix MC Plus produced by Thermo Fisher Scientific. This noble gas mass spectrometer 7 can perform static analysis on noble gases; the noble gas mass spectrometer 7 is also connected to a vacuum pump group 8, and the vacuum pump group 8 can be used to pump the vacuum in the system; the cryopump 5 adsorbs or releases nitrogen and / or xenon by setting different temperatures. Specifically, the cryopump 5 can condense the gas by using low temperature and then release the gas by heating. The model of the cryopump 5 can be JANIS CCS-TRAP-HT / 204, and this cryopump 5 can be connected to the fifth valve 15 through a CF16 stainless steel knife-edge flange.

[0037] A first valve 11 and a second valve 12 are respectively arranged on the inlet side and the outlet side of the dry ice cold trap 3. The first valve 11 and the second valve 12 are used to control whether the dry ice cold trap 3 is connected to the sample container 1 and to control the flow of the water molecules adsorbed in the dry ice cold trap 3 to the subsequent gas separation and measurement stages. They can be manual valves or electric valves. The valves mentioned below can use the same valves as the first valve 11 and the second valve 12, or different valves, but they are all installed on the pipeline to control the on-off of the pipeline. A fourth valve 14 and a fifth valve 15 are respectively arranged between the gas delivery main pipe 9 and the vacuum pump group 8 and between the gas delivery main pipe 9 and the cryopump 5. The fourth valve 14 can control the opening and closing between the vacuum pump group 8 and the gas delivery main pipe 9 to control whether to perform a vacuum pumping operation on the gas delivery main pipe 9. The fifth valve 15 can control the inlet and outlet of the gas adsorbed in the cryopump 5. A seventh valve 17 is arranged between the gas delivery main pipe 9 and the noble gas mass spectrometer 7. The seventh valve 17 is used to control whether the gas is introduced into the noble gas mass spectrometer 7 for static analysis. A ninth valve 19 is arranged between the noble gas mass spectrometer 7 and the vacuum pump group 8. The ninth valve 19 can control whether the noble gas mass spectrometer 7 is evacuated.

[0038] A molecular sieve 2 for filtering water molecules is arranged between the first valve 11 and the dry ice cold trap 3. Before the sample is introduced into the dry ice cold trap 3, it first passes through the molecular sieve 2. By filtering the water molecules through the molecular sieve 2, the water molecules in the sample can be further removed, thereby reducing the influence of the water molecules on the measurement result and further improving the accuracy of the measurement result.

[0039] A branch pipeline can also be provided on the main gas transmission pipeline 9 to communicate with the CuO furnace 4. A third valve 13 is provided between the CuO furnace 4 and the main gas transmission pipeline 9. The third valve 13 can control the gas inlet and outlet of the CuO furnace 4. The CuO furnace 4 is made of a quartz tube and is connected to the third valve 13 through a knife-edge flange. 1-5 g of CuO powder is pre-placed in the quartz tube. Outside the quartz tube is a muffle furnace surrounding the quartz tube. The muffle furnace can control the temperature for heating, and the heating range needs to meet 30-500 °C. When the gas sample comes in, the temperature of the CuO is controlled to 250 °C and maintained for 20 minutes, which can remove reducing gases such as CO and CH 4 etc., which improves the abundance of the gas to be measured on the one hand and reduces the interference of CO on the N 2 measurement at the same peak position. At the same time, the water vapor and carbon dioxide gas generated by the reaction are adsorbed by the cold pump 5.

[0040] A gas transmission branch pipe is provided between the main gas transmission pipeline 9 and the rare gas mass spectrometer 7. The gas transmission branch pipe includes a nitrogen transmission branch pipe and a xenon transmission branch pipe arranged in parallel. A seventh valve 17 is provided on the nitrogen transmission branch pipe, and a sixth valve 16 is provided on the xenon transmission branch pipe. Through the setting of the above structure, the transmission paths of nitrogen and xenon can be distinguished, and the on-off can be controlled respectively through the seventh valve 17 and the sixth valve 16.

[0041] An adsorbent container 6 and an eighth valve 18 are sequentially arranged on the xenon transmission branch pipe between the sixth valve 16 and the rare gas mass spectrometer 7. The adsorbent container 6 is filled with an adsorbent, and the adsorbent can adsorb the active gas passing through the adsorbent container 6, improving the accuracy of subsequent xenon detection. It should be noted that the composition and components of the adsorbent are common knowledge in the art and are not the protection content of the present invention, so they will not be elaborated here.

[0042] Combined Figure 1 As shown, the present invention also provides an isotope static analysis method, which can be applied to the system described above, including the following steps:

[0043] The system is evacuated. When evacuating, a vacuum pump group 8 can be used, and when evacuating, both the inside of the system and the rare gas mass spectrometer 7 need to be evacuated;

[0044] Sample gas is introduced into the system. The molecular sieve 2 and / or the dry ice cold trap 3 can be used to remove impurity water molecules, and the cold pump 5 can be used to cool to a certain temperature range to adsorb nitrogen and xenon;

[0045] After the cold pump 5 adsorbs nitrogen and xenon, the vacuum pump group 8 is used to extract other impurity gases (such as He gas, Ne gas, etc.) with low boiling points in the system. Here, the low boiling point means that the boiling points of these gases are lower than the temperature set by the cold pump 5 for adsorbing nitrogen and xenon;

[0046] Increase the temperature of the adsorption device, which can be the cryopump 5 herein. By increasing the set temperature of the cryopump 5 and making the temperature between the boiling point of nitrogen and the boiling point of xenon, release nitrogen and introduce the nitrogen into the noble gas mass spectrometer 7 for measurement;

[0047] After the measurement of nitrogen is completed, continue to increase the temperature of the adsorption device (such as the cryopump 5) so that the temperature is higher than the boiling point of xenon, release xenon, and introduce the xenon into the noble gas mass spectrometer 7 for measurement.

[0048] Further, before the measurement after releasing nitrogen, the reducing gases including CO and CH 4 can be removed by using the CuO furnace 4.

[0049] After the measurement of nitrogen is completed, the measured nitrogen can be pumped away by using the vacuum pump set 8 to further purify the purity of the subsequent xenon.

[0050] Before measuring xenon, the active gases contained in the xenon can be adsorbed by using an adsorbent.

[0051] When removing impurity water molecules, the molecular sieve 2 can be used to filter the water molecules, and the dry ice cold trap 3 can be used to adsorb the water molecules passing through the molecular sieve 2.

[0052] The present invention also provides a specific embodiment:

[0053] 1. Evacuate the system: Before sample analysis, close the first valve 11 and open the second valve 12, the third valve 13, the fourth valve 14, the fifth valve 15, the sixth valve 16, the seventh valve 17, the eighth valve 18, and the ninth valve 19, and evacuate the gas inside each pipeline (including the gas transmission main pipe 9 and each branch pipe), the noble gas mass spectrometer 7, the dry ice cold trap 3, the CuO furnace 4, the cryopump 5, and the adsorbent container 6 (all at room temperature) (the air pressure is less than 1×10 -7 Pa);

[0054] 2. Remove impurity water molecules: Close the second valve 12 and open the first valve 11, and let the gas in the water sample freely diffuse through the molecular sieve 2 into the dry ice cold trap 3 to adsorb the water vapor molecules that are not completely filtered. After adding dry ice to the outer cup of the U-shaped tube of the dry ice cold trap 3, keep it for 20 minutes;

[0055] 3. Adsorb the gas to be measured: Set the temperature of the cryopump 5 to -220°C, close the first valve 11, the third valve 13, the fourth valve 14, the sixth valve 16, and the seventh valve 17, and open the second valve 12. Since the fifth valve 15 is open, all the gas can diffuse into the cryopump 5. Keep the temperature of the cryopump 5 at -220°C and maintain it for 10 minutes, so that the nitrogen and xenon in the gas sample can be fully adsorbed;

[0056] 4. Withdrawal of impurity gas: After nitrogen and xenon are sufficiently adsorbed by the cryopump 5, open the fourth valve 14 and use the vacuum pump set 8 to withdraw other gases (such as He gas, Ne gas, etc. with lower boiling points) in the pipeline.

[0057] 5. Purification of nitrogen: After 10 minutes, close the second valve 12 and the fourth valve 14, open the third valve 13, set the temperature of the cryopump 5 to -125 °C, and keep it for 60 minutes to diffuse the adsorbed nitrogen into the CuO furnace 4. When the gas sample comes in, control the temperature of CuO to 250 °C and keep it for 20 minutes, so as to remove reducing gases such as CO, CH 4 etc. At the same time, the water vapor and carbon dioxide gas generated by the reaction are adsorbed by the cryopump 5.

[0058] 6. Nitrogen measurement: After 20 minutes, close the eighth valve 18 and the ninth valve 19, open the seventh valve 17, and the gas in the pipeline diffuses to the noble gas mass spectrometer 7 to measure nitrogen and obtain the nitrogen measurement result.

[0059] 7. Withdrawal of measured nitrogen: After the nitrogen measurement is completed, open the fourth valve 14 and the ninth valve 19, use the vacuum pump set 8 to withdraw the measured nitrogen, and close the third valve 13 and the seventh valve 17 after 10 minutes.

[0060] 8. Release and purification of Xe gas: Close the fourth valve 14, open the sixth valve 16, set the temperature of the cryopump 5 to 80 °C, release the adsorbed Xe gas and other impurity gases. At the same time, the adsorbent can adsorb the active gases therein, and the whole process lasts for 30 minutes.

[0061] 9. Xe gas measurement: Close the ninth valve 19, open the eighth valve 18, and measure Xe gas with the noble gas mass spectrometer 7 to finally complete the whole measurement process.

[0062] In the present invention, specific examples are used to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A purification system for nitrogen and xenon in water, characterized in that: it includes a sample container, a dry ice cold trap, a main gas delivery pipe, and a noble gas mass spectrometer that are sequentially connected to the sample container. The main gas delivery pipe is provided with branch pipes that are respectively connected to a cold pump and a vacuum pump group. The noble gas mass spectrometer is connected to the vacuum pump group. The cold pump adsorbs or releases nitrogen and / or xenon by setting different temperatures; a first valve and a second valve are respectively arranged on the inlet side and the outlet side of the dry ice cold trap. A fourth valve and a fifth valve are respectively arranged between the main gas delivery pipe and the vacuum pump group and between the main gas delivery pipe and the cold pump. A seventh valve is arranged between the main gas delivery pipe and the noble gas mass spectrometer. A ninth valve is arranged between the noble gas mass spectrometer and the vacuum pump group; a gas delivery branch pipe is arranged between the main gas delivery pipe and the noble gas mass spectrometer. The gas delivery branch pipe includes a nitrogen delivery branch pipe and a xenon delivery branch pipe that are arranged in parallel. The seventh valve is arranged on the nitrogen delivery branch pipe. A sixth valve is arranged on the xenon delivery branch pipe; a branch pipe is arranged on the main gas delivery pipe and is connected to a CuO furnace. A third valve is arranged between the CuO furnace and the main gas delivery pipe; an adsorbent container and an eighth valve are sequentially arranged on the xenon delivery branch pipe between the sixth valve and the noble gas mass spectrometer; Among them, the specific operations for purifying nitrogen and measuring nitrogen are as follows: After evacuating the impurity gas for 10 minutes, close the second valve and the fourth valve, open the third valve, set the temperature of the cold pump to -125 °C, and keep it for 60 minutes to diffuse the adsorbed nitrogen into the CuO furnace. When the gas sample enters, control the temperature of the CuO furnace to 250 °C and keep it for 20 minutes to remove the reducing gases including CO, CH 4 etc. At the same time, the water vapor and carbon dioxide gas generated by the reaction are adsorbed by the cold pump; after 20 minutes, close the eighth valve and the ninth valve, open the seventh valve, and the gas in the pipeline diffuses to the noble gas mass spectrometer to measure nitrogen, and the nitrogen measurement result is obtained.

2. The purification system for nitrogen and xenon in water according to claim 1, characterized in that: a molecular sieve for filtering water molecules is arranged between the first valve and the dry ice cold trap.

3. An isotope static analysis method using the purification system according to claim 1, characterized in that, it includes the following steps: evacuating the system; introducing a sample gas into the system to remove impurity water molecules and adsorb nitrogen and xenon; extracting other impurity gases with low boiling points in the system; raising the temperature of the adsorption device and making the temperature between the boiling point of nitrogen and the boiling point of xenon to release nitrogen and introducing the nitrogen into the noble gas mass spectrometer for measurement; continuing to raise the temperature of the adsorption device so that the temperature is higher than the boiling point of xenon to release xenon and introducing the xenon into the noble gas mass spectrometer for measurement.

4. The isotope static analysis method according to claim 3, characterized in that: Before measurement after releasing nitrogen, use a CuO furnace to remove reducing gases including CO and CH 4 etc.

5. The isotope static analysis method according to claim 4, characterized in that: after the measurement of nitrogen is completed, the measured nitrogen is pumped away by the vacuum pump group.

6. The isotope static analysis method according to claim 3, characterized in that: before measuring xenon, the active gas is adsorbed by the adsorbent.

7. The isotope static analysis method according to any one of claims 3-6, characterized in that: when removing impurity water molecules, the water molecules are filtered by the molecular sieve, and the water molecules passing through the molecular sieve are adsorbed by the dry ice cold trap.

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