Pretreatment device for measuring nitrogen isotope in gas sample nitrogen

Abstract

The utility model discloses a pretreatment device for measuring nitrogen isotope in gas sample nitrogen, which relates to the technical field of nitrogen treatment and comprises a nitrogen treatment device, and an isotope ratio mass spectrometer for analyzing nitrogen isotope in nitrogen is arranged at one end of the nitrogen treatment device. A gas sample containing nitrogen enters a sample quantification loop through a manual sample injector, redundant samples are emptied through the manual sample injector, and the samples pass through a hydrazine water bottle filled with magnesium perchlorate to remove moisture; then the gas sample enters a chemical hydrazine bottle containing a silicon-carbon adsorbent to remove carbon monoxide and carbon dioxide, the sample finally enters a molecular sieve chromatographic column to separate nitrogen and oxygen, and finally the nitrogen enters a stable isotope ratio mass spectrometer to carry out nitrogen isotope analysis, so that the nitrogen isotope of the nitrogen in the gas sample is determined. Therefore, the isotope detection range of the chemical components in the gas sample is expanded, meanwhile, automatic operation can be realized, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen processing, in particular to a pre-processing device for measuring nitrogen isotopes in nitrogen gas samples. Background Art

[0002] In traditional methods for measuring nitrogen isotopes in nitrogen gas samples, it is usually necessary to pre-treat the gas samples to separate and purify the nitrogen isotopes in the nitrogen. Traditional pre-treatment methods mostly use chemical separation and physical adsorption, so a trace gas concentrator is required. However, when the trace gas concentrator is used, since the trace gas concentrator is not equipped with a nitrogen isotope analysis device in nitrogen, when measuring the nitrogen isotopes in the gas sample, the detection range of the chemical component isotopes in the gas sample cannot be well measured, and the determination results of the nitrogen isotopes in the gas sample and the test results of the nitrogen isotopes in the solid sample cannot be systematically analyzed, which is not conducive to studying the migration and transformation process and mechanism of the nitrogen element in the ecosystem. At the same time, the traditional method is less environmentally friendly during the processing process, and it is difficult to achieve automated operation, resulting in low efficiency.

[0003] Based on this, a pretreatment device for measuring nitrogen isotopes in nitrogen gas samples is now provided, which can eliminate the disadvantages of existing devices. Utility Model Content

[0004] The purpose of the utility model is to provide a pretreatment device for measuring nitrogen isotopes in nitrogen gas samples, so as to solve the problems in the background technology that, due to the fact that the trace gas concentrator is not equipped with a nitrogen isotope analysis device in nitrogen gas, when measuring the nitrogen isotopes in the gas sample, the detection range of the chemical component isotopes in the gas sample cannot be well measured, and the measurement results of the nitrogen isotopes in the gas sample and the test results of the nitrogen isotopes in the solid sample cannot be systematically analyzed, which is not conducive to studying the migration and transformation process and mechanism of the nitrogen element in the ecosystem and the traditional method is less environmentally friendly during the treatment process, and is difficult to achieve automated operation and low efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A pretreatment device for measuring nitrogen isotopes in nitrogen gas samples comprises a nitrogen treatment device, one side of which is provided with a connection mechanism for installing a manual injector, one end of the manual injector is provided with a fixing mechanism for installing it on a sample quantitative loop, and one end of the nitrogen treatment device is provided with an isotope ratio mass spectrometer for analyzing nitrogen isotopes in the nitrogen.

[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In an optional scheme: the connecting mechanism includes a connecting groove, a spring groove, a spring, a bayonet, a connecting block and a bayonet groove; a connecting groove is provided on one end surface of the nitrogen treatment device; a spring groove is provided on one side of the connecting groove; a spring is provided inside the spring groove; one end of the spring is fixedly connected to the spring groove; the other end is fixedly connected to the bayonet groove; the inner wall of the connecting groove is slidably connected to the connecting block; a bayonet groove is provided on one side of the connecting block; one end of the bayonet pin cooperates with the bayonet groove; and a manual injector is fixedly connected to the top of the connecting block.

[0009] In an optional solution, the diameter of the spring slot matches the diameter of the spring.

[0010] In an optional solution, the inner wall size of the connecting groove matches the outer wall size of the connecting block.

[0011] In an optional scheme: the fixing mechanism includes a connecting head, a connecting sleeve, a connecting tube and a threaded head, one end of the manual injector is fixedly connected to the connecting head, the surface of the connecting head is rotatably connected to the connecting sleeve, one end of the connecting head is fixedly connected to the connecting tube, and the inner wall of the connecting sleeve is threadedly connected to the threaded head.

[0012] In an optional solution: a sealing sleeve is slidably connected to the inner wall of the threaded head, one end of the connecting tube cooperates with the sealing sleeve, and one end of the threaded head is fixedly connected to a sample quantitative loop.

[0013] In an optional solution: one end of the sample quantitative loop is fixedly connected to a water hydrazine bottle, and one end of the water hydrazine bottle is provided with a chemical hydrazine bottle.

[0014] In an optional solution: a molecular sieve chromatographic column is fixedly connected to one side of the chemical hydrazine bottle, and an isotope ratio mass spectrometer is fixedly connected to one end of the molecular sieve chromatographic column.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The utility model provides a method in which a gas sample containing nitrogen enters a sample quantitative loop through a manual injector, excess sample is emptied through the manual injector, the sample passes through a water hydrazine bottle filled with magnesium perchlorate to remove moisture, and then enters a chemical hydrazine bottle containing a silicon-carbon adsorbent to remove carbon monoxide and carbon dioxide. The sample finally enters a molecular sieve chromatographic column to separate nitrogen and oxygen, and finally the nitrogen enters a stable isotope ratio mass spectrometer to perform nitrogen isotope analysis, thereby achieving determination of nitrogen isotopes of nitrogen in the gas sample, thereby expanding the detection range of chemical component isotopes in the gas sample, and systematically analyzing the determination results of nitrogen isotopes of nitrogen in the gas sample and the test results of nitrogen isotopes in the solid sample, which is helpful for studying the migration and transformation process and mechanism of nitrogen element in the ecosystem. At the same time, automated operation can be achieved, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the water hydrazine bottle and the chemical hydrazine bottle in the utility model.

[0019] Figure 3 This is a schematic diagram of the connecting mechanism structure of the present utility model.

[0020] Figure 4 This is a structural diagram of the fixing mechanism of the present utility model.

[0021] Figure 5 The utility model Figure 3 A is an enlarged schematic diagram.

[0022] Notes on the accompanying drawings: 1. Nitrogen treatment device; 2. Connecting mechanism; 201. Connecting groove; 202. Spring groove; 203. Spring; 204. Pin; 205. Connecting block; 206. Slot; 3. Manual injector; 4. Fixing mechanism; 401. Connecting head; 402. Connecting sleeve; 403. Connecting tube; 404. Threaded head; 5. Sealing sleeve; 6. Sample quantitative loop; 7. Water hydrazine bottle; 8. Chemical hydrazine bottle; 9. Molecular sieve chromatographic column; 10. Isotope ratio mass spectrometer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] In one embodiment, Figure 1-Figure 5As shown, a pretreatment device for measuring nitrogen isotopes in a gas sample nitrogen includes a nitrogen treatment device 1. A connecting mechanism 2 for mounting a manual injector 3 is provided on one side of the nitrogen treatment device 1, so that the manual injector 3 can be mounted on the nitrogen treatment device 1. A fixing mechanism 4 is provided at one end of the manual injector 3 for mounting it on a sample quantitative loop 6, so that the manual injector 3 can be mounted on the sample quantitative loop 6 so that a nitrogen gas sample can be added to the sample quantitative loop 6. An isotope ratio mass spectrometer 10 for analyzing nitrogen isotopes in nitrogen is provided at one end of the nitrogen treatment device 1, so that nitrogen isotope analysis can be performed.

[0025] In one embodiment, Figure 3 As shown, the connecting mechanism 2 includes a connecting groove 201, a spring groove 202, a spring 203, a bayonet 204, a connecting block 205 and a bayonet 206. A connecting groove 201 is provided on one end surface of the nitrogen treatment device 1. A spring groove 202 is provided on one side of the connecting groove 201. A spring 203 is provided inside the spring groove 202. One end of the spring 203 is fixedly connected to the spring groove 202, and the other end is fixedly connected to the bayonet 204. The inner wall of the connecting groove 201 is slidably connected to the connecting block 205. One side of the connecting block 205 is provided with a The card slot 206, one end of the card pin 204 cooperates with the card slot 206, and the top of the connecting block 205 is fixedly connected with the manual injector 3. The manual injector 3 is inserted into the connecting slot 201 through the connecting block 205. The surface of the connecting block 205 will squeeze the card pin 204 and the spring 203. When the connecting block 205 is in a suitable position, the spring 203 resets and pushes the card pin 204 into the interior of the card slot 206, so that the manual injector 3 is connected to the nitrogen treatment device 1 through the connecting block 205, thereby completing the installation of the manual injector 3.

[0026] In one embodiment, Figure 5 As shown, the diameter of the spring slot 202 matches the diameter of the spring 203. When the spring 203 is extended or retracted, the spring slot 202 will limit the spring 203 to prevent the spring 203 from shaking.

[0027] In one embodiment, Figure 3 As shown, the inner wall size of the connecting groove 201 matches the outer wall size of the connecting block 205. When the connecting block 205 slides inside the connecting groove 201, the connecting groove 201 can limit the sliding of the connecting block 205 to prevent the connecting block 205 from shaking inside the connecting groove 201.

[0028] In one embodiment, Figure 4As shown, the fixing mechanism 4 includes a connecting head 401, a connecting sleeve 402, a connecting tube 403 and a threaded head 404. One end of the manual injector 3 is fixedly connected to the connecting head 401, and the surface of the connecting head 401 is rotatably connected to the connecting sleeve 402. One end of the connecting head 401 is fixedly connected to the connecting tube 403, and the inner wall of the connecting sleeve 402 is threadedly connected to the threaded head 404. When the manual injector 3 needs to be installed on the sample quantitative ring 6, one end of the connecting tube 403 is inserted into the sealing sleeve 5, and the connecting sleeve 402 is twisted to thread the connecting sleeve 402 with the threaded head 404, so that the manual injector 3 is connected to the sample quantitative ring 6. The manual injector 3 is installed on the sample quantitative ring 6 through the fixing mechanism 4.

[0029] In one embodiment, Figure 4 As shown, the inner wall of the threaded head 404 is slidably connected to a sealing sleeve 5, and one end of the connecting tube 403 cooperates with the sealing sleeve 5 to seal the connection between the manual injector 3 and the sample quantitative ring 6, thereby preventing nitrogen from leaking when the nitrogen gas sample enters the sample quantitative ring 6 through the manual injector 3. One end of the threaded head 404 is fixedly connected to the sample quantitative ring 6, so that the manual injector 3 can be installed on the sample quantitative ring 6 through the fixing mechanism 4.

[0030] In one embodiment, Figure 1 As shown, one end of the sample quantitative loop 6 is fixedly connected to a water hydrazine bottle 7, the interior of the water hydrazine bottle 7 is filled with magnesium perchlorate for removing moisture from the nitrogen gas, and one end of the water hydrazine bottle 7 is provided with a chemical hydrazine bottle 8, the interior of the chemical hydrazine bottle 8 contains a silicon-carbon adsorbent for removing carbon monoxide and carbon dioxide from the nitrogen gas.

[0031] In one embodiment, Figure 2 As shown, a molecular sieve chromatographic column 9 is fixedly connected to one side of the chemical hydrazine bottle 8 for separating nitrogen and oxygen, and an isotope ratio mass spectrometer 10 is fixedly connected to one end of the molecular sieve chromatographic column 9 for performing isotope analysis on the separated nitrogen.

[0032] Working principle: The above embodiment discloses a pretreatment device for measuring nitrogen isotopes in gas sample nitrogen, wherein, when in use, the manual injector 3 is inserted into the connecting groove 201 through the connecting block 205, and the surface of the connecting block 205 will squeeze the bayonet 204 and the spring 203. When the connecting block 205 is in a suitable position, the spring 203 resets and pushes the bayonet 204 into the interior of the bayonet 206, so that the manual injector 3 is connected to the nitrogen treatment device 1 through the connecting block 205, thereby completing the installation of the manual injector 3. When the connecting block 205 is in a suitable position, the spring 203 resets and pushes the bayonet 204 into the interior of the bayonet 206, so that the manual injector 3 is connected to the nitrogen treatment device 1 through the connecting block 205, thereby completing the installation of the manual injector 3, and the gas containing nitrogen isotopes is injected into the gas sample 3. The bulk sample enters the sample quantitative loop 6 through the manual injector 3, and the excess sample is emptied through the manual injector 3. The sample passes through the water hydrazine bottle 7 containing magnesium perchlorate to remove water; then enters the chemical hydrazine bottle 8 containing silicon-carbon adsorbent to remove carbon monoxide and carbon dioxide. The sample finally enters the molecular sieve chromatographic column 9 to separate nitrogen and oxygen. Finally, the nitrogen enters the stable isotope ratio mass spectrometer 10 for nitrogen isotope analysis, thereby realizing the determination of nitrogen isotopes of nitrogen in the gas sample, thereby expanding the detection range of chemical component isotopes in the gas sample. The determination results of nitrogen isotopes of nitrogen in the gas sample and the nitrogen isotope test results in the solid sample are systematically analyzed, which is conducive to studying the migration and transformation process and mechanism of nitrogen in the ecosystem. At the same time, it can realize automated operation and improve its efficiency.

[0033] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A pretreatment device for measuring nitrogen isotopes in nitrogen gas sample, comprising a nitrogen treatment device (1), characterized in that: A connecting mechanism (2) for installing a manual injector (3) is provided on one side of the nitrogen processing device (1); a fixing mechanism (4) for installing the manual injector (3) on a sample quantitative ring (6) is provided on one end of the nitrogen processing device (1); and an isotope ratio mass spectrometer (10) for analyzing nitrogen isotopes in nitrogen is provided on one end of the nitrogen processing device (1).

2. A pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 1, characterized in that: The connecting mechanism (2) comprises a connecting groove (201), a spring groove (202), a spring (203), a bayonet (204), a connecting block (205) and a bayonet (206); a connecting groove (201) is provided on one end surface of the nitrogen treatment device (1); a spring groove (202) is provided on one side of the connecting groove (201); a spring (203) is provided inside the spring groove (202); one end of the spring (203) is fixedly connected to the spring groove (202); the other end is fixedly connected to the bayonet (204); a connecting block (205) is slidably connected to the inner wall of the connecting groove (201); a bayonet (206) is provided on one side of the connecting block (205); one end of the bayonet (204) cooperates with the bayonet (206); and a manual injector (3) is fixedly connected to the top of the connecting block (205).

3. The pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 2, characterized in that: The diameter of the spring slot (202) matches the diameter of the spring (203).

4. The pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 2, characterized in that: The inner wall size of the connecting groove (201) matches the outer wall size of the connecting block (205).

5. The pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 2, characterized in that: The fixing mechanism (4) comprises a connector (401), a connector sleeve (402), a connector tube (403) and a threaded head (404); one end of the manual injector (3) is fixedly connected to the connector (401); the surface of the connector (401) is rotatably connected to the connector sleeve (402); one end of the connector (401) is fixedly connected to the connector tube (403); and the inner wall of the connector sleeve (402) is threadedly connected to the threaded head (404).

6. The pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 5, characterized in that: The inner wall of the threaded head (404) is slidably connected to a sealing sleeve (5), one end of the connecting tube (403) is matched with the sealing sleeve (5), and one end of the threaded head (404) is fixedly connected to a sample quantitative ring (6).

7. The pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 6, characterized in that: One end of the sample quantitative ring (6) is fixedly connected to a water hydrazine bottle (7), and one end of the water hydrazine bottle (7) is provided with a chemical hydrazine bottle (8).

8. The pretreatment device for measuring nitrogen isotopes in nitrogen gas samples according to claim 7, characterized in that: One side of the chemical hydrazine bottle (8) is fixedly connected to a molecular sieve chromatographic column (9), and one end of the molecular sieve chromatographic column (9) is fixedly connected to an isotope ratio mass spectrometer (10).

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