Portable dual-light-path atomic absorption-gas chromatography combined detector

Abstract

The invention provides a portable dual-optical-path atomic absorption-gas chromatography combined detector, and relates to the technical field of material chromatography detection.The portable dual-optical-path atomic absorption-gas chromatography combined detector comprises a shell, a sample introduction mechanism, a pushing mechanism and a graphite furnace, a glass bin is installed on the surface of the shell, the graphite furnace is installed in the glass bin, the surface of the shell is in threaded connection with a back plate, and the back plate is in threaded connection with the sample introduction mechanism. A top plate is integrally formed at the top end of the back plate, a pushing mechanism is in threaded connection with the bottom of the top plate, and a fixing frame is installed on the surface of the shell. And after detection and cleaning are completed, follow-up injection detection treatment can be immediately carried out, the efficiency of multiple times of detection is improved, seamless connection is achieved in the switching process, it can be ensured that all residues adhering to the interior of the sample injection groove are flushed out in the follow-up pure water cleaning process, and detection interference on follow-up samples is reduced.

Description

Technical Field

[0001] This invention relates to the field of materials chromatography detection technology, specifically a portable dual-path atomic absorption-gas chromatography coupled detector. Background Technology

[0002] The dual-beam atomic absorption spectrophotometer-gas chromatography (DABS) is a high-sensitivity analytical instrument that combines dual-beam atomic absorption spectrophotometry with gas chromatography. Its core principle is to achieve efficient separation of organometallic compounds in a sample through gas chromatography, followed by element-specific detection of the separated components using a dual-beam atomic absorption system. The dual-beam design dynamically compensates for light source fluctuations, improving measurement stability, but it cannot eliminate the influence of atomizer instability. This coupled technique combines the advantages of strong separation capabilities and low matrix interference of gas chromatography, making it particularly suitable for speciation analysis of trace organometallic compounds in environmental samples.

[0003] In existing technologies, dual-path atomic absorption-gas chromatography (DIP-GC) instruments require cleaning the inside of the graphite furnace with pure water after each detection. However, manual sample loading makes it difficult to thoroughly rinse the entire inner wall of the graphite furnace during each cleaning, resulting in cleaning dead zones. Furthermore, multiple detection processes necessitate frequent sample loading, sealing, and reopening, making the operation cumbersome. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a portable dual-path atomic absorption-gas chromatography-mass spectrometry (DAS-GC) detector to solve the problems mentioned in the background section. This invention, through its sample injection mechanism, allows for the direct injection preparation of subsequent samples while the previous sample is being tested. Furthermore, it enables immediate subsequent injection and testing after cleaning, significantly improving the efficiency of multiple tests. The seamless switching process enhances the sealing during multiple sample preparation, ensuring that all residues adhering to the injection tank are completely flushed out during subsequent pure water rinsing, reducing interference with the detection of subsequent samples.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a portable dual-path atomic absorption-gas chromatography-mass spectrometry (DAS-GC) detector, comprising a detector body, the detector body including a shell, a sample injection mechanism, a pushing mechanism, and a graphite furnace. A glass chamber is mounted on the surface of the shell, and a graphite furnace is installed inside the glass chamber. A back plate is threaded onto the surface of the shell, and a top plate is integrally formed at the top of the back plate. A pushing mechanism is threaded onto the bottom of the top plate. A mounting bracket is mounted on the surface of the shell, and a sample injection mechanism is mounted at the top of the mounting bracket. The surface of the sample injection mechanism has multiple sample injection slots. One end of the pushing mechanism is embedded into the sample injection slots, and the other end of the pushing mechanism is provided with an outer sleeve that passes downward from the top of the glass chamber. A guide sleeve is provided at the top of the graphite furnace, and one end of the pushing mechanism passes downward from the inside of the guide sleeve into the inside of the graphite furnace.

[0006] Furthermore, the sample injection mechanism includes a motor, a turntable, and a sealing ring. The turntable is installed at the end of the output shaft of the motor. The sample injection slot is opened on the surface of the turntable, and a baffle is embedded inside each sample injection slot. A receiving hole is opened in the middle of the baffle. A sample delivery pipe is connected to the side of the sealing ring.

[0007] Furthermore, the outer casing of the motor is screwed to the inner side of the fixing frame, the top of the fixing frame is welded to the bottom of the sealing ring, the number of sample inlet slots is four, and the side of the turntable has four mating interfaces.

[0008] Furthermore, the interior of each of the sample inlet slots is connected to a corresponding interface portion, and the end of the sample delivery pipe extends from the inside of the sealing ring. Each sample inlet slot is connected to the interior of the sample delivery pipe via the interface after rotation.

[0009] Furthermore, the pushing mechanism includes an electric telescopic rod, a pressing plate, a pressing column, and an outer sleeve. The top end of the electric telescopic rod is screwed onto the surface of the top plate, and the bottom end of the electric telescopic rod is connected and fixed to the pressing plate using screws.

[0010] Furthermore, an outer sleeve is welded to one end of the pressing plate, a strip-shaped hole is opened on the side of the outer sleeve, a lifting pipe is integrally formed at the bottom of the outer sleeve, and a sample discharge head is provided at the end of the lifting pipe.

[0011] Furthermore, the sample delivery pipe passes through the strip hole into the interior of the outer sleeve, a first spring is sleeved on the surface of the pressing column, an adhesive plate is integrally formed at the bottom of the pressing column, a insertion pipe is provided at the bottom of the adhesive plate, the pressing plate is sleeved on the top of the pressing column, and the top of the first spring is welded to the bottom surface of the pressing plate.

[0012] Furthermore, a cleaning pipe is connected to the top of the pressing column, the bonding plate is used to be embedded inside the injection slot, the insertion pipe is used to be embedded inside the receiving hole, and the side of the bonding plate is in contact with the inner wall of the injection slot.

[0013] Furthermore, the graphite furnace is internally divided into a heating chamber and a barrier layer, and a partition is installed between the heating chamber and the barrier layer. A second spring is welded to the bottom of the partition, and the bottom end of the second spring is welded to the bottom of the barrier layer.

[0014] Furthermore, the graphite furnace has a drainage channel on its side, the side of the partition is in contact with the inner wall of the graphite furnace, and after the partition moves down, the heating chamber is connected to the inside of the drainage channel. The lifting pipe passes downward from the inside of the guide sleeve, and the sample discharge head is used to press on the surface of the partition.

[0015] The beneficial effects of this invention are: This portable dual-path atomic absorption-gas chromatography-mass spectrometer, through its sample injection mechanism, can directly prepare subsequent samples for injection while the previous sample is being tested. After cleaning and testing are completed, subsequent injection and testing can be performed immediately, significantly improving the efficiency of multiple tests. The seamless switching process also enhances the sealing of multiple sample preparation processes.

[0016] This portable dual-path atomic absorption-gas chromatography-mass spectrometry (DAS-GC) instrument delivers samples into the graphite furnace via a pusher mechanism. This process ensures that the sample inside the injection chamber is scraped and squeezed out each time it is injected, and also ensures that all residues adhering to the injection chamber are flushed out during the subsequent pure water rinsing process, reducing interference with the detection of subsequent samples.

[0017] This portable dual-path atomic absorption-gas chromatography detector also uses a push mechanism to trigger the connection of cavities inside the graphite furnace. This process ensures that the sample does not flow into the drainage channel when it is heated and vaporized. After the detection is completed, the heating chamber can be quickly connected to the drainage channel, ensuring that any area inside the graphite furnace can be rinsed and cleaned. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of a portable dual-path atomic absorption-gas chromatography-coupled detector according to the present invention; Figure 2 This is a schematic diagram of the sample delivery structure in the detector; Figure 3 This is an exploded view of the sample introduction mechanism of the present invention; Figure 4 This is a structural diagram of one end of the pushing mechanism of the present invention; Figure 5 This is a split view of the other end of the pushing mechanism of the present invention; Figure 6 This is a structural diagram of the end of the sample delivery pipe of the present invention; Figure 7 This is a cross-sectional view of the graphite furnace of the present invention; In the diagram: 1. Outer shell; 2. Glass chamber; 3. Back plate; 4. Sample inlet mechanism; 5. Pushing mechanism; 6. Graphite furnace; 7. Top plate; 8. Cleaning pipe; 9. Fixing frame; 10. Sealing ring; 11. Sample delivery pipe; 12. Motor; 13. Turntable; 14. Sample inlet slot; 15. Baffle; 16. Receiving hole; 17. Connecting interface; 18. Pressing plate; 19. First spring; 20. Pressing column; 21. Adhesive plate; 22. Insertion pipe; 23. Outer sleeve; 24. Strip hole; 25. Lifting pipe; 26. Sample discharge head; 27. Electric telescopic rod; 28. Extrusion ring; 29. ​​Outlet hole; 30. Spray hole; 31. Heating chamber; 32. Partition plate; 33. Barrier layer; 34. Second spring; 35. Drainage channel; 36. Guide sleeve. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Please see Figures 1 to 7 The present invention provides the following technical solution: a portable dual-path atomic absorption-gas chromatography-mass spectrometry (DAS-GC) detector, comprising a detector body, the detector body comprising a shell 1, a sample injection mechanism 4, a pushing mechanism 5, and a graphite furnace 6. A glass chamber 2 is mounted on the surface of the shell 1, and the graphite furnace 6 is mounted inside the glass chamber 2. A back plate 3 is threadedly connected to the surface of the shell 1, and a top plate 7 is integrally formed at the top of the back plate 3. The pushing mechanism 5 is screwed to the bottom of the top plate 7. A fixing frame 9 is mounted on the surface of the shell 1, and the sample injection mechanism 4 is mounted at the top of the fixing frame 9. The surface of the sample injection mechanism 4 has multiple sample injection slots 14. One end of the pushing mechanism 5 is used to embed into the interior of the sample injection slots 14, and the other end of the pushing mechanism 5 is provided with an outer sleeve 23. The outer sleeve 23 passes downward from the top of the glass chamber 2. A guide sleeve 36 is provided at the top of the graphite furnace 6, and one end of the pushing mechanism 5 passes downward from the interior of the guide sleeve 36 into the interior of the graphite furnace 6. This detector combines dual-path atomic absorption spectrometry and gas chromatography to perform material analysis and processing.

[0021] In this invention, the sample to be tested is manually injected into the sample introduction mechanism 4, and then pushed by the top pushing mechanism 5. The sample is transported along the sample delivery pipe 11 to the graphite furnace 6 inside the glass chamber 2 for heating treatment. The dual-path atomic absorption spectrometry (AAS) system uses two independent light sources to simultaneously irradiate atomic vapor, and quantitatively analyzes the target metal element by measuring the absorption intensity of characteristic wavelength light. The dual-path design effectively eliminates the influence of light source fluctuations, matrix interference, and non-characteristic absorption by comparing the reference signal and the sample signal in real time. After the detection is completed, the top cleaning pipe 8 is connected to external pure water. After injecting pure water, the pushing mechanism 5 extends the flow, connecting the heating cavity inside the graphite furnace 6 with the drainage channel 35. At this time, the injected pure water can then enter the interior of the graphite furnace 6 along the sample introduction mechanism 4 and the pushing mechanism 5 to re-clean the residue.

[0022] In this embodiment, the sample injection mechanism 4 includes a motor 12, a turntable 13, and a sealing ring 10. The turntable 13 is mounted on the end of the output shaft of the motor 12. Sample injection slots 14 are formed on the surface of the turntable 13, and each sample injection slot 14 has a baffle 15 embedded inside. A receiving hole 16 is formed in the middle of the baffle 15. A sample delivery pipe 11 is connected to the side of the sealing ring 10. The outer shell 1 of the motor 12 is screwed to the inner side of the fixing frame 9. The top of the fixing frame 9 is welded to the bottom of the sealing ring 10. There are four sample injection slots 14, and four mating interfaces 17 are formed on the side of the turntable 13. The interior of each sample injection slot 14 is connected to the corresponding mating interface 17. The end of the sample delivery pipe 11 extends out from the inside of the sealing ring 10. Each sample injection slot 14 is connected to the interior of the sample delivery pipe 11 through the mating interface 17 after rotation. The injection mechanism 4 allows for the direct injection preparation of subsequent samples while the previous sample is being tested, and enables immediate subsequent injection testing after the testing and cleaning process is completed. This significantly improves the efficiency of multiple tests, and the seamless switching process enhances the sealing performance during the preparation of multiple samples.

[0023] Specifically, by manually inserting the sample into the receiving hole 16 through a needle, the sample can be injected into the bottom of the baffle 15. The buoyancy of the injected sample will cause the baffle 15 to rise like a mountain. At this time, the corresponding interface 17 on the side of the sample inlet 14 is blocked by the side sealing ring 10, which can prevent the sample from seeping out from the interface 17. Until the motor 12 at the bottom is started, the turntable 13 is rotated and the sample inlet 14 is rotated to align with the pressing column 20 above. Then the pushing mechanism 5 is started to push the sample inside the sample inlet 14 towards the bottom. The sample passes through the interface 17 and enters the sample delivery pipe 11, and finally enters the graphite furnace 6. During this process, sample injection can also be performed directly on the sample inlet 14 at other positions.

[0024] In this embodiment, the pushing mechanism 5 includes an electric telescopic rod 27, a pressing plate 18, a pressing column 20, and an outer sleeve 23. The top end of the electric telescopic rod 27 is screwed onto the surface of the top plate 7, and the bottom end of the electric telescopic rod 27 is partially connected and fixed to the pressing plate 18 with screws. An outer sleeve 23 is welded to one end of the pressing plate 18. A strip-shaped hole 24 is provided on the side of the outer sleeve 23. A lifting pipe 25 is integrally formed at the bottom of the outer sleeve 23, and a sample dispensing head 26 is provided at the end of the lifting pipe 25. The sample delivery pipe 11 passes through the strip-shaped hole 24 into the interior of the outer sleeve 23. A first spring 19 is fitted onto the surface of the pressing column 20. A bonding plate 21 is integrally formed at the bottom of the pressing column 20, and a insertion pipe 22 is provided at the bottom of the bonding plate 21. The pressing plate 18 is fitted onto the top end of the pressing column 20, and the top end of the first spring 19 is welded to the bottom surface of the pressing plate 18. The top of the pressing column 20 is connected to a cleaning pipe 8. The bonding plate 21 is used to embed into the sample inlet 14, and the insertion pipe 22 is used to embed into the receiving hole 16. The side of the bonding plate 21 is in contact with the inner wall of the sample inlet 14. The process of transporting the sample into the graphite furnace 6 is realized by the pushing mechanism 5. This process can also ensure that the sample inside the sample inlet 14 can be scraped out each time a sample is injected, and can also ensure that all the residue adhering inside the sample inlet 14 is flushed out during the subsequent pure water rinsing process, reducing interference with the detection of subsequent samples.

[0025] Specifically, after activating the electric telescopic rod 27, the pressing plate 18 below can be pushed downwards. The pressing plate 18 pushes the entire pressing column 20 downwards through the first spring 19, achieving the purpose of pushing the sample inside the sample inlet 14. During this process, the outer sleeve 23 and the lifting pipe 25 on the other side will also move downwards to ensure that the sample discharge head 26 is inserted into the heating chamber 31. After the test is completed, the electric telescopic rod 27 is further extended. At this time, due to the presence of the first spring 19, the bonding plate 21 that has been pressed into the sample inlet 14 will no longer move downwards, while the lifting pipe 25 on the other side will continue to move downwards to facilitate the subsequent cleaning process.

[0026] In this embodiment, the graphite furnace 6 is internally divided into a heating chamber 31 and a barrier layer 33, with a partition 32 installed between them. A second spring 34 is welded to the bottom of the partition 32, and the bottom end of the second spring 34 is welded to the bottom of the barrier layer 33. A drainage channel 35 is provided on the side of the graphite furnace 6. The side of the partition 32 is in contact with the inner wall of the graphite furnace 6, and after the partition 32 moves down, the heating chamber 31 and the drainage channel 35 are connected. The lifting pipe 25 passes downward from the inside of the guide sleeve 36, and the sample discharge head 26 is used to press against the surface of the partition 32. Similarly, the cavity connection inside the graphite furnace 6 can be triggered by the pushing mechanism 5. This process ensures that the sample does not flow into the drainage channel 35 when it is heated and vaporized, and after the test is completed, the interior of the heating chamber 31 can be quickly connected to the drainage channel 35, ensuring that any area inside the graphite furnace 6 can be rinsed and cleaned.

[0027] Specifically, after the lifting pipe 25 and the sample discharge head 26 are inserted into the heating chamber 31, the sample inside the sample inlet 14 can be pushed into the heating chamber 31 in conjunction with the pressing column 20 in the pushing mechanism 5, and atomic vapor is generated. After the detection is completed, the pushing effect of the pushing mechanism 5 is further used until the sample discharge head 26 is partially pressed against the surface of the partition 32, and downward pressure is applied, which compresses the second spring 34. The subsequently injected pure water enters the heating chamber 31 and is further discharged from the side drainage channel 35, realizing the rinsing and cleaning treatment of the entire graphite furnace 6.

[0028] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A portable dual-path atomic absorption-gas chromatography-coupled detector, comprising a detector body, characterized in that: The detector body includes a shell (1), a sample injection mechanism (4), a pushing mechanism (5), and a graphite furnace (6). A glass chamber (2) is installed on the surface of the shell (1), and a graphite furnace (6) is installed inside the glass chamber (2). A back plate (3) is threadedly connected to the surface of the shell (1). A top plate (7) is integrally formed at the top of the back plate (3). The pushing mechanism (5) is screwed to the bottom of the top plate (7). A fixing frame (9) is installed on the surface of the shell (1), and the top of the fixing frame (9) is fitted with a... The sample injection mechanism (4) is provided with a plurality of sample injection slots (14) on its surface. One end of the push mechanism (5) is used to be embedded in the sample injection slot (14). The other end of the push mechanism (5) is provided with an outer sleeve (23). The outer sleeve (23) passes downward from the top of the glass chamber (2). The top of the graphite furnace (6) is provided with a guide sleeve (36). One end of the push mechanism (5) passes downward from the inside of the guide sleeve (36) into the inside of the graphite furnace (6).

2. The portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 1, characterized in that: The sample injection mechanism (4) includes a motor (12), a turntable (13) and a sealing ring (10). The turntable (13) is installed at the end of the output shaft of the motor (12). The sample injection slot (14) is opened on the surface of the turntable (13), and a baffle (15) is embedded in the interior of each sample injection slot (14). A receiving hole (16) is opened in the middle of the baffle (15). A sample delivery pipe (11) is connected to the side of the sealing ring (10).

3. The portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 2, characterized in that: The outer casing (1) of the motor (12) is screwed to the inner side of the fixing frame (9). The top of the fixing frame (9) is welded to the bottom of the sealing ring (10). There are four sample inlet slots (14). The turntable (13) has four mating interfaces (17) on its side.

4. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 3, characterized in that: The interior of each of the sample inlet slots (14) is connected to the corresponding interface (17). The end of the sample delivery pipe (11) passes through the inside of the sealing ring (10). Each sample inlet slot (14) is connected to the interior of the sample delivery pipe (11) by rotating the interface (17).

5. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 2, characterized in that: The pushing mechanism (5) includes an electric telescopic rod (27), a pressing plate (18), a pressing column (20), and an outer sleeve (23). The top end of the electric telescopic rod (27) is screwed onto the surface of the top plate (7), and the bottom end of the electric telescopic rod (27) is partially connected and fixed to the pressing plate (18) with screws.

6. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 5, characterized in that: One end of the pressing plate (18) is welded with an outer sleeve (23), and the side of the outer sleeve (23) is provided with a strip hole (24). The bottom of the outer sleeve (23) is integrally formed with a lifting pipe (25), and the end of the lifting pipe (25) is provided with a sample discharge head (26).

7. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 6, characterized in that: The sample delivery pipe (11) passes through the strip hole (24) into the interior of the outer sleeve (23). The surface of the pressing column (20) is fitted with a first spring (19). The bottom of the pressing column (20) is integrally formed with a bonding plate (21). The bottom of the bonding plate (21) is provided with a plug pipe (22). The pressing plate (18) is fitted on the top of the pressing column (20), and the top of the first spring (19) is welded to the bottom surface of the pressing plate (18).

8. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 7, characterized in that: The top of the pressing column (20) is connected to a cleaning pipe (8), the fitting plate (21) is used to be embedded in the sample inlet (14), the insertion pipe (22) is used to be embedded in the receiving hole (16), and the side of the fitting plate (21) is fitted with the inner wall of the sample inlet (14).

9. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 6, characterized in that: The graphite furnace (6) is divided into a heating chamber (31) and a barrier layer (33), and a partition (32) is installed between the heating chamber (31) and the barrier layer (33). A second spring (34) is welded to the bottom of the partition (32), and the bottom end of the second spring (34) is welded to the bottom of the barrier layer (33).

10. A portable dual-path atomic absorption-gas chromatography-coupled detector according to claim 9, characterized in that: The graphite furnace (6) has a drainage channel (35) on its side. The side of the partition (32) is in contact with the inner wall of the graphite furnace (6). After the partition (32) moves down, the heating chamber (31) is connected to the inside of the drainage channel (35). The lifting pipe (25) passes down through the inside of the guide sleeve (36). The sample discharge head (26) is used to press on the surface of the partition (32).

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