Liquid mass spectrometry measuring device for nitrosamine in water

Abstract

The utility model belongs to the technical field of measurement of nitrosamine liquid in water, and particularly relates to a liquid phase mass spectrum measurement device for nitrosamine in water, which comprises a bottom plate, tracks are fixedly arranged on two sides of the top of the bottom plate, and a first threaded rod is rotatably fixed in the two tracks; first sliding blocks are fixed to the positions, on the left side of the bottom plate, of the outer walls of the two first threaded rods in a threaded mode, a connecting plate is fixedly arranged between the tops of the two first sliding blocks, a rotating module is installed in the middle of the top of the connecting plate, a supporting frame is fixedly arranged at the top of the rotating module, and an electric push rod is movably fixed to the lower portion of the supporting frame. A sampling module is fixedly arranged at the output end of the electric push rod, a filter cartridge is fixedly arranged in the middle of the top of the bottom plate, a constant-temperature box is fixedly arranged on the right side of the top of the bottom plate, and a water tank is fixedly arranged in the middle of the top of the constant-temperature box, so that nitrosamine liquid in water is detected in the constant-temperature box after the water is filtered; therefore, the nitrosamine liquid in the water can be measured more accurately.

Description

Technical Field

[0001] This utility model relates to the technical field of determination of nitrosamines in water, and in particular to a liquid phase mass spectrometry device for determining nitrosamines in water. Background Technology

[0002] Nitrosamines are a class of pollutants with the -NN=O structure. Of the more than 300 nitrosamines discovered to date, approximately 90% are carcinogenic. In recent years, they have been detected in beer, smoked meat products, cosmetics, tobacco, and latex products. Nitrosamines are referred to by the media as "PM2.5 in water," and their presence has been found in river water, groundwater, sewage, and drinking water. Studies have shown that disinfection processes, including chlorine dioxide, ozone, and chlorine, combined with ultraviolet radiation, may lead to an increase in nitrosamine levels.

[0003] In existing technologies, the water is not filtered during the detection of nitrosamines in water, resulting in a higher concentration of impurities and thus inaccurate detection results. Utility Model Content

[0004] Based on the existing technical problems in the determination of nitrosamines in water, this invention proposes a liquid phase mass spectrometry device for the determination of nitrosamines in water.

[0005] This utility model proposes a liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water, comprising a base plate, with tracks fixed on both sides of the top of the base plate, and first threaded rods rotatably fixed inside the two tracks. First sliders are threadedly fixed to the outer walls of the two first threaded rods on the left side of the base plate, and a connecting plate is fixed between the tops of the two first sliders. A rotating module is installed in the middle of the top of the connecting plate, and a support frame is fixed on the top of the rotating module. An electric push rod is movably fixed to the lower part of the support frame, and a sampling module is fixed at the output end of the electric push rod. A filter cylinder is fixed in the middle of the top of the base plate, and a constant temperature chamber is fixed on the right side of the top of the base plate. A water tank is fixed in the middle of the top of the constant temperature chamber.

[0006] Preferably, the rotating module includes a rotating box, and a fourth motor is fixedly installed on one side inside the rotating box. The transmission shaft of the fourth motor is fixedly connected to a second driving gear. A fixed shaft is rotatably fixed in the middle of the fourth motor. A second driven gear is sleeved on the outer wall of the fixed shaft. The second driven gear and the second driving gear are meshed together. A rotating plate is fixedly installed on the top of the fixed shaft.

[0007] The above technical solution, with the meshing of the second driving gear and the second driven gear, facilitates the rotation of the rotating plate by the fourth motor.

[0008] Preferably, the bottom of the support frame is provided with a movable groove, and a second motor is fixedly provided on the side of the movable groove near the rotating module. The transmission shaft of the second motor is coaxially fixed with a second threaded rod through a coupling, and a second slider is threadedly fixed on the outer wall of the second threaded rod. An electric push rod is fixedly provided at the bottom of the second slider.

[0009] Through the above technical solution, the cooperation between the second motor and the second threaded rod facilitates the movement of the second slider, making it easier to adjust the sampling module.

[0010] Preferably, a third motor is fixedly installed on one side inside the sampling module, and a first driving gear is fixedly connected to the transmission shaft of the third motor. A connecting shaft is rotatably fixed on one side of the first driving gear, and a first driven gear is fixed to the outer wall of the connecting shaft. The first driven gear and the first driving gear are meshed. An outer cylinder is fixedly installed on the outer wall of the connecting shaft at the bottom of the sampling module, and an inner cylinder is interactively fixed inside the outer cylinder. The top middle of the inner cylinder is fixedly connected to the bottom of the connecting shaft. A sensor is fixedly installed directly above the first driven gear on the top wall of the sampling module. Two input holes are provided on the outer wall of the outer cylinder, and the two input holes are arranged vertically. Two input holes adapted to the input holes of the outer cylinder are provided on the outer wall of the inner cylinder, and the input holes on the inner cylinder are arranged vertically and opposite to each other.

[0011] Through the above technical solution, the meshing arrangement of the first driving gear and the first driven gear facilitates the misalignment of the inner cylinder and the outer cylinder, thereby making it easier to sample and preserve water in the inner cylinder.

[0012] Preferably, an annular fixing block is fixedly provided in the middle of the filter cylinder, and four slots are equally spaced on the top of the annular fixing block. A stop block is hinged to both sides of each slot on the top of the annular fixing block, and a filter plate is fixedly engaged in the four slots.

[0013] Through the above technical solution, the filter plate can remove impurities, dust and other dirt from the surface of the sample water.

[0014] Preferably, a partition is fixedly installed in the middle of the interior of the constant temperature chamber, and a mass spectrometry detection system is fixedly installed at the top center of the partition. A temperature sensor is fixed on one side of the mass spectrometry detection system at the top of the partition. A chromatographic column is fixedly installed on the top wall of the constant temperature chamber. A first water pipe is detachably fixed to the top of the chromatographic column. An infusion pump is fixedly installed between the filter cartridge at the top of the bottom plate and the constant temperature chamber. The output end of the infusion pump is fixedly connected to the first water pipe on the chromatographic column. The input end of the infusion pump is fixedly connected to the bottom of the filter plate inside the filter cartridge through the first water pipe.

[0015] The above technical solutions facilitate the detection of water samples by setting up chromatographic columns and mass spectrometry detection systems.

[0016] Preferably, the mass spectrometry detection system includes an ion source, a mass analyzer, and a detector. The input end of the ion source is fixedly connected to the bottom of the chromatographic column via a first water pipe, and the output end of the mass spectrometry detection system is connected to the mass analyzer via a first water pipe. The output end of the mass analyzer is connected to the detector via a first water pipe.

[0017] The above technical solutions, including the ion source, mass analyzer, and detector, enable specific detection and analysis of the water sample.

[0018] Preferably, the water tank has a first water tank, a second water tank, and a third water tank inside, and water passage holes are provided between the first water tank, the second water tank, and the third water tank. A cooling pump is installed inside the second water tank, and a water pump is fixedly installed on the top of the constant temperature chamber. An electric heating tube is installed at the bottom of the constant temperature chamber. A cooling trough is provided inside the constant temperature chamber, and a cooling pipe is installed inside the cooling trough. The input end of the cooling pipe is fixedly connected to the output end of the water pump through a second water pipe, and the input end of the water pump is fixedly connected to the inside of the third water tank through a second water pipe. The output end of the cooling pipe is fixedly connected to the inside of the first water tank through a third water pipe, and an inlet pipe is fixedly installed on the top of the first water tank.

[0019] The above technical solution, with its water pump, cooling pipes, and water tank, enables water circulation within the cooling pipes, thereby facilitating water conservation.

[0020] Preferably, both first threaded rods rotate through the track to the outside of the track near the constant temperature chamber, and belt rollers are fixed on the outer walls of both tracks, and the two belt rollers are fixedly connected by a belt. A first motor is fixedly installed on the side of the bottom plate near the constant temperature chamber, and the drive shaft of the first motor is fixedly connected to one of the first threaded rods through a coupling. Rollers are fixed at the four corners of the bottom of the bottom plate.

[0021] The above technical solution allows for easy movement of the rollers.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. By setting up a first threaded rod, a first motor, a rotating module, a support frame, an electric push rod, a sampling module, a second motor, and a second threaded rod in coordination, it is easy for the sampling module to enter the water and sample the water.

[0024] 2. By setting up a third motor, a first driving gear, a first driven gear, an outer cylinder, and an inner cylinder to work together, it is easy for the inner cylinder to enter the water to take water samples and preserve them.

[0025] 3. By setting up a filter cartridge and using baffles to engage the filter plate inside the filter cartridge, it is convenient to filter the sample water, and the filter plate is easy to disassemble and replace.

[0026] 4. By setting up a system with cooling pipes, a water tank, a temperature sensor, and a water pump working together, a constant temperature effect can be easily achieved inside the constant temperature chamber. Furthermore, the water pump, water tank, and cooling pipes work together to ensure that the water inside the cooling pipes circulates, thereby saving water resources. Attached Figure Description

[0027] Figure 1 This is a frontal view of the liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water proposed in this utility model.

[0028] Figure 2 This is a schematic diagram of the overall back view of the liquid chromatography-mass spectrometry device for determining nitrosamines in water proposed in this utility model;

[0029] Figure 3 This is a cross-sectional view of the sampling module and the rotating module of the liquid chromatography-mass spectrometry device for determining nitrosamines in water proposed in this utility model;

[0030] Figure 4 This is a cross-sectional view of the water tank, constant temperature chamber, and filter cylinder of a liquid chromatography-mass spectrometry device for determining nitrosamines in water according to the present invention.

[0031] Figure 5 for Figure 3 Enlarged view of point A in the middle;

[0032] Figure 6 for Figure 3 Enlarged view at point B in the middle;

[0033] Figure 7 for Figure 4 Enlarged view of point C.

[0034] In the diagram: 1. Base plate; 2. Roller; 3. Track; 4. First threaded rod; 5. First motor; 6. Belt roller; 7. Belt; 8. First slider; 9. Connecting plate; 10. Rotating module; 11. Support frame; 12. Electric push rod; 13. Sampling module; 14. Filter cartridge; 15. Constant temperature chamber; 16. Water tank; 17. Infusion pump; 18. First water pipe; 19. Box plate; 20. Inlet pipe; 22. Movable groove; 23. Second motor; 24. Second slider; 25. Second threaded rod; 26. Filter plate; 27. Water pump; 28. Second water pipe; 29. ​​Third water pipe; 30. First water tank; 31. Second water tank; 32. ... 33. Water tank; 34. Cooling pump; 35. Heating tube; 36. Cooling tank; 37. Cooling tube; 38. Chromatographic column; 39. Mass spectrometry detection system; 40. Ion source; 41. Mass analyzer; 42. Detector; 43. Connecting block; 44. Third motor; 45. First driving gear; 46. First driven gear; 47. Outer cylinder; 48. Inner cylinder; 49. Connecting shaft; 50. Rotating box; 51. Fourth motor; 52. Fixed shaft; 53. Second driving gear; 54. Rotating plate; 55. Annular fixed block; 56. Stop block; 57. Slot; 58. Sensor; 59. Temperature sensor; 60. Partition plate. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0036] Example 1:

[0037] Reference Figures 1-7A liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water includes a base plate 1. Tracks 3 are fixedly mounted on both sides of the top of the base plate 1. First threaded rods 4 are rotatably fixed inside the two tracks 3. First sliders 8 are threadedly fixed to the outer walls of the two first threaded rods 4 on the left side of the base plate 1. A connecting plate 9 is fixedly mounted between the tops of the two first sliders 8. A rotating module 10 is installed in the middle of the top of the connecting plate 9. A support frame 11 is fixedly mounted on the top of the rotating module 10. An electric push rod 12 is movably fixed to the lower part of the support frame 11. A sampling module 13 is fixedly mounted at the output end of the electric push rod 12. A filter cylinder 14 is fixedly mounted in the middle of the top of the base plate 1. A constant temperature chamber 15 is fixedly mounted on the right side of the top of the base plate 1. A water tank 16 is fixedly mounted in the middle of the top of the constant temperature chamber 15. Both first threaded rods 4 rotate through the track 3 to the outside of the track 3 near the constant temperature chamber 15, and belt rollers 6 are fixed on the outer walls of both tracks 3, and the two belt rollers 6 are fixedly connected by a belt 7. A first motor 5 is fixedly installed on the side of the base plate 1 near the constant temperature chamber 15, and the drive shaft of the first motor 5 is fixedly connected to one of the first threaded rods 4 through a coupling. Rollers 2 are fixed at the four corners of the bottom of the base plate 1. The rotating module 10 includes a rotating box 49, and a fourth motor 50 is fixedly installed on one side inside the rotating box 49. A second driving gear 52 is fixedly connected to the drive shaft of the fourth motor 50. A fixed shaft 51 is rotatably fixed in the middle of the fourth motor 50, and a second driven gear 53 is sleeved on the outer wall of the fixed shaft 51. The second driven gear 53 and the second driving gear 52 are meshed. A rotating plate 54 is fixedly installed on the top of the fixed shaft 51. The support frame 11 has a movable groove 22 at its bottom, and a second motor 23 is fixedly installed on the movable groove 22 near the rotating module 10. The transmission shaft of the second motor 23 is coaxially fixed to a second threaded rod 25 through a coupling, and a second slider 24 is threadedly fixed to the outer wall of the second threaded rod 25. An electric push rod 12 is fixedly installed at the bottom of the second slider 24. A third motor 43 is fixedly installed on one side inside the sampling module 13, and a first driving gear 44 is fixedly connected to the transmission shaft of the third motor 43. A connecting shaft 48 is rotatably fixed on one side of the first driving gear 44, and a first driven gear 45 is fixed to the outer wall of the connecting shaft 48. The first driven gear 45 and the first driving gear 44 are meshed. An outer cylinder 46 is fixedly installed on the outer wall of the connecting shaft 48 at the bottom of the sampling module 13, and an inner cylinder 47 is interactively fixed inside the outer cylinder 46. The top middle of the inner cylinder 47 is fixedly connected to the bottom of the connecting shaft 48. A sensor 58 is fixedly installed directly above the first driven gear 45 on the inner top wall of the sampling module 13. Two input holes are provided on the outer wall of the outer cylinder 46, and the two input holes are arranged vertically. Two input holes that are adapted to the input holes of the outer cylinder 46 are provided on the outer wall of the inner cylinder 47, and the input holes on the inner cylinder 47 are arranged vertically and opposite to each other.An annular fixing block 55 is fixedly provided in the middle of the filter cylinder 14, and four slots 57 are equally spaced on the top of the annular fixing block 55. A stop block 56 is hinged on both sides of each slot 57 on the top of the annular fixing block 55, and a filter plate 26 is fixedly engaged inside the four slots 57.

[0038] Example 2:

[0039] In this embodiment, refer to Figures 1-7 Based on Embodiment 1, a partition 60 is fixedly installed in the middle of the interior of the constant temperature chamber 15, and a mass spectrometry detection system 38 is fixedly installed at the top center of the partition 60. A temperature sensor 59 is fixed on one side of the mass spectrometry detection system 38 at the top of the partition. A chromatographic column 37 is fixedly installed on the top wall of the constant temperature chamber 15. A first water pipe 18 is detachably fixed to the top of the chromatographic column 37. An infusion pump 17 is fixedly installed between the filter cartridge 14 at the top of the bottom plate 1 and the constant temperature chamber 15. The output end of the infusion pump 17 is fixedly connected to the first water pipe 18 on the chromatographic column 37. The input end of the infusion pump 17 is fixedly connected to the bottom of the filter plate 26 inside the filter cartridge 14 through the first water pipe 18. The mass spectrometry detection system 38 includes an ion source 39, a mass analyzer 40, and a detector 41. The input end of the ion source 39 is fixedly connected to the bottom of the chromatographic column 37 through a first water pipe 18. The output end of the mass spectrometry detection system 38 is connected to the mass analyzer 40 through the first water pipe 18. The output end of the mass analyzer 40 is connected to the detector 41 through the first water pipe 18. The water tank 16 has a first water tank 30, a second water tank 31, and a third water tank 32 inside, and water passage holes are provided between the first water tank 30, the second water tank 31, and the third water tank 32. A cooling pump 33 is installed inside the second water tank 31, and a water pump 27 is fixedly installed on the top of the constant temperature chamber 15. An electric heating tube 34 is installed at the bottom of the constant temperature chamber 15. A cooling groove 35 is provided inside the constant temperature chamber 15, and a cooling pipe 36 is installed inside the cooling groove 35. The input end of the cooling pipe 36 is fixedly connected to the output end of the water pump 27 through a second water pipe 28, and the input end of the water pump 27 is fixedly connected to the inside of the third water tank 32 through the second water pipe 28. The output end of the cooling pipe 36 is fixedly connected to the inside of the first water tank 30 through a third water pipe 29, and an inlet pipe 20 is fixedly installed on the top of the first water tank 30.

[0040] Working principle: In use, the first motor 5 is started, causing the two first threaded rods 4 to rotate, thereby moving the sampling module 13 away from the base plate 1. Then, the second motor 23 and the electric push rod 12 are started, causing the sampling module 13 to enter the water. When the sampling module 13 enters the water, the sensor 58 detects the water level to prevent water from submerging the third motor 43. Then, the third motor 43 is started, causing the inner cylinder 47 to rotate inside the outer cylinder 46, so that the input holes at the top of the outer cylinder 46 and the inner cylinder 47 coincide, thus facilitating the entry of sample water into the inner cylinder 47. Then, the rotating module 10 drives the sampling module 13 to the top of the filter cartridge 14. The third motor 43 then causes the input holes at the bottom of the outer cylinder 46 and the inner cylinder 47 to overlap, allowing the sample water to enter the filter cartridge 14. The infusion pump 17 is then started, allowing the sample water to enter the chromatographic column 37 and the mass spectrometry detection system 38 for detection. During the detection process, the temperature sensor 59 detects the temperature inside the constant temperature chamber 15, which facilitates the cooperation of the heating tube 34 and the cooling tube 36 to adjust the temperature inside the constant temperature chamber 15, thereby making the detection of nitrosamines inside the sample water more accurate.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water, comprising a base plate (1), characterized in that: The bottom plate (1) is fixed with rails (3) on both sides of the top, and the two rails (3) are fixed with first threaded rods (4) inside. The outer walls of the two first threaded rods (4) are fixed with first sliders (8) on the left side of the bottom plate (1). A connecting plate (9) is fixed between the tops of the two first sliders (8). A rotating module (10) is installed in the middle of the top of the connecting plate (9). A support frame (11) is fixed on the top of the rotating module (10). An electric push rod (12) is movably fixed on the lower part of the support frame (11). A sampling module (13) is fixed at the output end of the electric push rod (12). A filter cylinder (14) is fixed in the middle of the top of the bottom plate (1). A constant temperature box (15) is fixed on the right side of the top of the bottom plate (1). A water tank (16) is fixed in the middle of the top of the constant temperature box (15).

2. The liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water according to claim 1, characterized in that: The rotating module (10) includes a rotating box (49), and a fourth motor (50) is fixedly installed on one side inside the rotating box (49). The transmission shaft of the fourth motor (50) is fixedly connected to a second driving gear (52). A fixed shaft (51) is rotatably fixed in the middle of the fourth motor (50). A second driven gear (53) is sleeved on the outer wall of the fixed shaft (51). The second driven gear (53) meshes with the second driving gear (52). A rotating plate (54) is fixedly installed on the top of the fixed shaft (51).

3. The liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water according to claim 2, characterized in that: The support frame (11) has a movable groove (22) at the bottom, and a second motor (23) is fixedly installed on the side of the movable groove (22) near the rotating module (10). The transmission shaft of the second motor (23) is coaxially fixed with a second threaded rod (25) through a coupling, and a second slider (24) is threadedly fixed on the outer wall of the second threaded rod (25). An electric push rod (12) is fixedly installed at the bottom of the second slider (24).

4. The liquid chromatography-mass spectrometry (LC-MS) device for determining nitrosamines in water according to claim 3, characterized in that: A third motor (43) is fixedly installed on one side inside the sampling module (13), and a first driving gear (44) is fixedly connected to the transmission shaft of the third motor (43). A connecting shaft (48) is rotatably fixed on one side of the first driving gear (44), and a first driven gear (45) is fixed to the outer wall of the connecting shaft (48). The first driven gear (45) and the first driving gear (44) are meshed. An outer cylinder (46) is fixedly installed on the outer wall of the connecting shaft (48) at the bottom of the sampling module (13). The outer cylinder (46) is internally fixed with an inner cylinder (47), and the top middle of the inner cylinder (47) is fixedly connected to the bottom of the connecting shaft (48). A sensor (58) is fixedly installed directly above the first driven gear (45) on the inner top wall of the sampling module (13). Two input holes are provided on the outer wall of the outer cylinder (46), and the two input holes are arranged vertically. Two input holes are provided on the outer wall of the inner cylinder (47) that are compatible with the input holes of the outer cylinder (46), and the input holes on the inner cylinder (47) are arranged vertically and opposite to each other.

5. The liquid chromatography-mass spectrometry (LC-MS) apparatus for determining nitrosamines in water according to claim 4, characterized in that: The filter cylinder (14) is fixedly provided with an annular fixing block (55) in the middle, and four slots (57) are equally spaced on the top of the annular fixing block (55). A stop block (56) is hinged on both sides of each slot (57) on the top of the annular fixing block (55), and a filter plate (26) is fixedly engaged inside the four slots (57).

6. The liquid chromatography-mass spectrometry (LC-MS) apparatus for determining nitrosamines in water according to claim 5, characterized in that: A partition (60) is fixedly installed in the middle of the interior of the constant temperature chamber (15), and a mass spectrometry detection system (38) is fixedly installed at the top center of the partition (60). A temperature sensor (59) is fixed on one side of the mass spectrometry detection system (38) at the top of the partition. A chromatographic column (37) is fixedly installed on the top wall of the constant temperature chamber (15). A first water pipe (18) is detachably fixed on the top of the chromatographic column (37). An infusion pump (17) is fixed between the filter cartridge (14) at the top of the bottom plate (1) and the constant temperature chamber (15). The output end of the infusion pump (17) is fixedly connected to the first water pipe (18) on the chromatographic column (37). The input end of the infusion pump (17) is fixedly connected to the bottom of the filter plate (26) inside the filter cartridge (14) through the first water pipe (18).

7. The liquid chromatography-mass spectrometry (LC-MS) apparatus for determining nitrosamines in water according to claim 6, characterized in that: The mass spectrometry detection system (38) includes an ion source (39), a mass analyzer (40), and a detector (41). The input end of the ion source (39) is fixedly connected to the bottom of the chromatographic column (37) through a first water pipe (18). The output end of the mass spectrometry detection system (38) is connected to the mass analyzer (40) through the first water pipe (18). The output end of the mass analyzer (40) is connected to the detector (41) through the first water pipe (18).

8. The liquid chromatography-mass spectrometry (LC-MS) apparatus for determining nitrosamines in water according to claim 7, characterized in that: The water tank (16) has a first water tank (30), a second water tank (31), and a third water tank (32) inside, and water passage holes are provided between the first water tank (30), the second water tank (31), and the third water tank (32). A cooling pump (33) is installed inside the second water tank (31), and a water pump (27) is fixedly installed on the top of the constant temperature box (15). An electric heating tube (34) is installed at the bottom of the constant temperature box (15), and a cooling groove is provided in the inner cavity of the constant temperature box (15). (35) A cooling pipe (36) is installed inside the cooling tank (35). The input end of the cooling pipe (36) is fixedly connected to the output end of the water pump (27) through the second water pipe (28). The input end of the water pump (27) is fixedly connected to the inside of the third water tank (32) through the second water pipe (28). The output end of the cooling pipe (36) is fixedly connected to the inside of the first water tank (30) through the third water pipe (29). An inlet pipe (20) is fixedly provided at the top of the first water tank (30).

9. The liquid chromatography-mass spectrometry (LC-MS) apparatus for determining nitrosamines in water according to claim 8, characterized in that: Both first threaded rods (4) rotate through the track (3) to the outside of the track (3) near the constant temperature box (15), and belt rollers (6) are fixed on the outer wall of both tracks (3), and the two belt rollers (6) are fixedly connected by belts (7). A first motor (5) is fixedly installed on the side of the bottom plate (1) near the constant temperature box (15), and the drive shaft of the first motor (5) is fixedly connected to one of the first threaded rods (4) through a coupling. Rollers (2) are fixed at the four corners of the bottom of the bottom plate (1).

Images