Nitrogen-based pretreatment equipment for complex matrix sample

Abstract

The invention relates to the technical field of complex matrix sample analysis and treatment, and discloses nitrogen-based complex matrix sample pretreatment equipment which comprises a nitrogen tank, a nitrogen inlet pipe is mounted at the top of the nitrogen tank, and a volatilization bottle is mounted at the end, away from the nitrogen tank, of the nitrogen inlet pipe. A heating mechanism is arranged at the bottom of the volatilization bottle, a volatilization pipe is installed on the side, away from the nitrogen inlet pipe, of the top of the volatilization bottle, a condensation assembly is installed at the end, away from the volatilization bottle, of the volatilization pipe, a water tank is arranged on the rear side of the condensation assembly, and a water inlet pipe is arranged at the top of the water tank; and the heating box is arranged on the periphery of the volatilization bottle. Through mutual cooperation of the heater, the heating pipe and the water inlet plate, the effects of uniformly heating a sample and promoting rapid volatilization of a volatile compound are achieved, and the problem of insufficient volatilization of the compound or loss of the sample caused by uneven heating or inaccurate temperature control is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of complex matrix sample analysis and processing, and in particular to a nitrogen-based complex matrix sample preprocessing device. Background Art

[0002] Complex matrix samples refer to samples with complex components and more background interference, which are commonly found in environmental monitoring, food safety, industrial wastewater treatment and other fields. Such samples usually contain a variety of impurities such as various organic compounds, inorganic salts, particulate matter, etc. Not only are the components unevenly distributed, but there will be interference effects between the impurities and the target substances. During the analysis process, these complex components will have a significant impact on the sensitivity and accuracy of the detection. Therefore, it is particularly important to perform efficient pretreatment of complex matrix samples before detection;

[0003] The nitrogen-based complex matrix sample pretreatment equipment is a technical device specially used to process complex matrix samples. It uses nitrogen as a purge gas. Through its inert and high-purity characteristics, it avoids the oxidation reaction caused by oxygen. At the same time, it combines heating, volatilization and condensation technology to efficiently remove volatile organic compounds or interfering impurities in the sample. This type of equipment usually includes a nitrogen supply system, a heating system, a condensation and absorption system, and a sample collection system. Through the synergistic effect of multiple functions, it provides a high-purity, low-interference pretreatment solution for sample analysis;

[0004] In the process of processing complex matrix samples in the prior art, some problems exist, such as uneven heating, inaccurate temperature control, and low volatilization efficiency. Since some traditional equipment lacks a heating control module or a real-time temperature monitoring function, it is difficult for the volatile compounds in the sample to be fully released. At the same time, the complexity of the sample matrix can lead to insufficient volatilization or sample degradation. These problems not only affect the extraction efficiency of the target compound, but also interfere with subsequent analysis and detection. It is difficult for the existing equipment to take into account the sample processing efficiency, accuracy and stability at the same time. Especially in the field of complex matrix sample processing that requires efficient volatilization, its limitations are particularly prominent. Therefore, the present invention proposes a nitrogen-based pretreatment device for complex matrix samples to solve the shortcomings of the prior art. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a nitrogen-based pretreatment device for complex matrix samples, which solves the problems of uneven heating of complex matrix samples, difficult to flexibly adjust the installation position of the volatilization bottle, low condensation efficiency and incomplete recovery of volatile compounds.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a nitrogen-based pretreatment device for complex matrix samples, comprising a nitrogen tank, a nitrogen inlet pipe is installed on the top of the nitrogen tank, a volatilization bottle is installed at one end of the nitrogen inlet pipe away from the nitrogen tank, a heating mechanism is provided at the bottom of the volatilization bottle, a volatilization tube is installed on one side of the top of the volatilization bottle away from the nitrogen inlet pipe, a condensation assembly is installed at one end of the volatilization tube away from the volatilization bottle, a water tank is provided at the rear side of the condensation assembly, and a water inlet pipe is provided at the top of the water tank;

[0007] The heating mechanism includes a heating box, which is arranged on the outer periphery of the volatile bottle, a support plate is slidably connected inside the heating box, a placement plate is provided on the side of the support plate close to the volatile bottle, heaters are installed on the front and rear sides of the interior of the heating box, and heating tubes are provided on the opposite sides of the two heaters, a temperature display screen is installed on the front side of the heating box, a temperature sensor is provided on the front side of the interior of the heating box, a water inlet plate is installed on the side of the interior of the heating box away from the temperature sensor, a filtering assembly is provided on the side of the heating box away from the volatile bottle, fixing assemblies are provided on the left and right sides of the support plate, and a connecting pipe is installed in the middle of the heating box.

[0008] Preferably, the condensation assembly includes an outer condensation tube, which is installed on the outer periphery of an end of the volatile tube away from the volatile bottle, a spiral condensation tube is installed inside the outer condensation tube, the top of the spiral condensation tube is installed on an end of the volatile tube close to the outer condensation tube, a conical flask is installed on the end of the outer condensation tube away from the volatile tube, a jacket is slidably connected to the outer periphery of the condensation tube, a connecting rod is fixed to a side of the jacket close to the water tank, a side of the connecting rod away from the spiral condensation tube is fixed to a side of the water tank close to the outer condensation tube, and an ice bath assembly is provided on a side of the conical flask away from the condensation outer tube.

[0009] Preferably, the filter assembly comprises a filter box, which is installed on a side of the connecting pipe away from the heating box, a filter plate is slidably connected to the interior of the filter box, and a drain pipe is installed on a side of the filter box close to the water tank.

[0010] Preferably, the ice bath assembly comprises an ice bath box, the ice bath box is installed on a side of the conical flask away from the condensation outer tube, a refrigerator is fixed on a side of the ice bath box away from the volatile bottle, a fan is installed on a side of the refrigerator away from the ice bath box, a refrigeration pipe is fixed on a side of the refrigerator close to the ice bath box, a second water inlet plate is provided on a side of the interior of the ice bath box close to the water tank, and a second temperature display screen is provided on a side of the ice bath box away from the water tank.

[0011] Preferably, the fixing assembly includes a shell, which is fixed to the outside of the support plate, and the shell is slidably connected to the front and rear sides thereof, and plug rods are fixed on opposite sides of the two pull plates, and a sliding rod is slidably connected between the pull plate and the plug rod, a spring is fixed to the side of the pull plate close to the sliding rod, and a slot is opened inside the heating box.

[0012] Preferably, a flow meter is installed in the middle of the nitrogen inlet pipe, and a flow display screen is installed on the top of the flow meter.

[0013] Preferably, the side of the volatile bottle close to the heating box is slidably connected to the top of the placement plate, and the first water inlet plate and the second water inlet plate are both connected to the water tank through a pipeline.

[0014] Preferably, a partition is fixed on the opposite sides of the two shift plates, and the spring is sleeved on the outer periphery of the slide rod.

[0015] Preferably, the insertion rod is slidably connected inside the slot.

[0016] The present invention also provides a nitrogen-based pretreatment method for complex matrix samples, comprising the following steps:

[0017] S1. Place the volatilization bottle containing wastewater on the top of the support plate, adjust the position of the support plate according to the size of the volatilization bottle, and fix the insertion rod into the slot through the cooperation between the paddle and the spring to ensure that the nitrogen inlet pipe and the volatilization tube are smoothly inserted into the volatilization bottle.

[0018] S2. Start the nitrogen tank and deliver nitrogen to the volatilization bottle through the nitrogen inlet pipe. At the same time, start the heater and water inlet plate 1, and inject water into the heating box through the water inlet plate 1. After the heating tube is heated up, the volatilization bottle is heated to promote the volatilization of volatile compounds in the wastewater.

[0019] S3. The volatile compounds enter the spiral condenser through the volatilization tube. The circulating cooling water in the condensation outer tube is provided by the water tank, which takes away the heat of the volatiles, condenses the compounds into liquid and flows into the conical flask.

[0020] S4. After the liquid compound enters the conical flask, start the water inlet plate to inject water into the ice bath box, and start the refrigerator and refrigeration tube at the same time. The low-temperature ice bath can inhibit the secondary volatilization of the liquid compound to ensure its stable storage.

[0021] S5. After the pretreatment is completed, the wastewater in the heating box is transported to the filter box through the connecting pipe, filtered through the filter plate, and discharged through the drain pipe, completing the pretreatment work.

[0022] The present invention provides a nitrogen-based pretreatment device for complex matrix samples, which has the following beneficial effects:

[0023] 1. The present invention achieves the effect of uniformly heating the sample and promoting the rapid volatilization of volatile compounds through the cooperation of the heater, the heating tube and the water inlet plate, avoiding the problem of insufficient volatilization of the compound or sample loss due to uneven heating or inaccurate temperature control. At the same time, through the real-time monitoring function of the temperature sensor and the precise adjustment function of the temperature control display, the controllability of the volatilization process and the stability of the experimental conditions are further optimized, which not only greatly improves the sample volatilization efficiency, but also ensures the repeatability and reliability of the experiment, and meets the demand for efficient volatilization of complex matrix sample processing.

[0024] 2. The present invention achieves the effects of efficient condensation and continuous low-temperature preservation of volatile compounds through the mutual cooperation of the spiral condenser, the cooling water circulation system and the ice bath system, avoiding the problems of incomplete recovery of compounds or secondary volatilization due to low condensation efficiency and insufficient cooling. At the same time, the spiral condenser extends the cooling path and the deep low temperature control of the ice bath system, which not only improves the condensation efficiency and storage stability of the compounds, but also optimizes the complete collection process of the compounds, providing good technical guarantee for the high purity and precise pretreatment of complex matrix samples.

[0025] 3. The present invention achieves the effect of flexible adjustment of the installation position of the volatile bottle through the mutual cooperation between the support plate and the dial plate, avoiding the problem of unsmooth insertion of the nitrogen inlet pipe and the volatile tube due to the volatile bottle being installed too low. At the same time, the reset function of the spring ensures that the position of the support plate is fixed and stable, which not only improves the convenience of equipment operation, but also ensures the installation accuracy of the volatile bottle and the stability of sample processing, further improves the applicability of the equipment and the safety of the experimental process, and provides reliable guarantee for the efficient operation of complex sample pretreatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the nitrogen tank of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the flow meter of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the filter box of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the support plate of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the plug rod of the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the jacket of the present invention;

[0033] Figure 8 It is a structural schematic diagram of the refrigeration tube of the present invention;

[0034] Fig. 9 It is a schematic structural diagram of the filter plate of the present invention.

[0035] Among them, 1. nitrogen tank; 2. heating mechanism; 201. heating box; 202. support plate; 203. placement plate; 204. heater; 205. heating tube; 206. temperature sensor; 207. temperature display screen one; 208. water inlet plate one; 209. connecting pipe; 3. filter assembly; 301. filter box; 302. filter plate; 303. drain pipe; 4. water tank; 5. ice bath assembly; 501. ice bath box; 502. temperature display screen two; 503. water inlet plate two; 504. fan; 505, refrigeration tube; 506, refrigerator; 6, condensation assembly; 601, condensation outer tube; 602, spiral condensation tube; 603, conical flask; 604, jacket; 605, connecting rod; 7, volatile bottle; 8, nitrogen inlet pipe; 9, volatile tube; 10, fixing assembly; 1001, shell; 1002, dial plate; 1003, partition; 1004, plug rod; 1005, spring; 1006, slide rod; 1007, slot; 11, water inlet pipe; 12, flow meter; 13, flow display screen. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Please refer to the attached Figure 1 - Attachment Figure 3 The embodiment of the present invention provides a nitrogen-based pretreatment device for complex matrix samples, comprising a nitrogen tank 1, a nitrogen inlet pipe 8 is installed on the top of the nitrogen tank 1, a flow meter 12 is installed in the middle of the nitrogen inlet pipe 8, a flow display screen 13 is installed on the top of the flow meter 12, a volatilization bottle 7 is installed at one end of the nitrogen inlet pipe 8 away from the nitrogen tank 1, a heating mechanism 2 is provided at the bottom of the volatilization bottle 7, a volatilization tube 9 is installed on the side of the top of the volatilization bottle 7 away from the nitrogen inlet pipe 8, a condensation assembly 6 is installed at one end of the volatilization tube 9 away from the volatilization bottle 7, a water tank 4 is provided on the rear side of the condensation assembly 6, and a water inlet pipe 11 is provided on the top of the water tank 4;

[0038] In the present invention, the nitrogen tank 1 is used to store nitrogen, and the nitrogen inlet pipe 8 on the top thereof transports the nitrogen to the volatilization bottle 7. The flow meter 12 in the middle of the nitrogen inlet pipe 8 and the flow display screen 13 on the top can display the flow rate of the nitrogen transport. The heating mechanism 2 at the bottom of the volatilization bottle 7 heats the sample to promote the volatilization of volatile compounds. The volatilization tube 9 on the top of the volatilization bottle 7 transports the volatiles to the condensation component 6. The water tank 4 on the rear side of the condensation component 6 is supplemented with water through the top water inlet pipe 11 to provide water resources for each component.

[0039] Please see attached Figure 4 - Attachment Figure 5 The heating mechanism 2 includes a heating box 201, which is arranged on the outer periphery of the volatile bottle 7. The side of the volatile bottle 7 close to the heating box 201 is slidably connected to the top of the placement plate 203. A support plate 202 is slidably connected inside the heating box 201. A placement plate 203 is provided on the side of the support plate 202 close to the volatile bottle 7. Heaters 204 are installed on the front and back sides of the interior of the heating box 201. The two heaters 204 are provided with heating tubes 205 on the opposite sides. A temperature display screen 207 is installed on the front side of the heating box 201. A temperature sensor 206 is provided on the front side of the interior of the heating box 201. A water inlet plate 208 is installed on the side of the interior of the heating box 201 away from the temperature sensor 206. A filtering component 3 is provided on the side of the heating box 201 away from the volatile bottle 7. Fixed components 10 are provided on the left and right sides of the support plate 202. A connecting pipe 209 is installed in the middle of the heating box 201.

[0040] In the present invention, the heating box 201 is arranged on the periphery of the volatilization bottle 7 to provide a stable working environment. The support plate 202 can be flexibly fixed at different heights through the fixing components 10 on the left and right sides, thereby meeting the installation requirements of volatilization bottles 7 of different sizes and avoiding the insertion of the nitrogen inlet pipe 8 and the volatilization tube 9 due to improper installation position of the volatilization bottle 7. The heater 204 and the heating tube 205 achieve the effect of uniform heating of the volatilization bottle 7 by uniformly heating the temperature of the water, avoiding insufficient volatilization of the compound or loss of the sample due to uneven heating. The temperature display screen 207 and the temperature sensor 206 installed on the front side of the heating box 201 cooperate with each other to monitor and display the temperature in the heating box 201 in real time. The operator can adjust the heating power according to the temperature display screen 207. The water inlet plate 208 is used to inject water into the heating box 201, and the connecting pipe 209 is used to transport the used liquid.

[0041] Please see attached Figure 7The condensation assembly 6 includes an outer condensation tube 601, which is installed on the outer periphery of the end of the volatilization tube 9 away from the volatilization bottle 7. A spiral condensation tube 602 is installed inside the outer condensation tube 601. The top of the spiral condensation tube 602 is installed on the end of the volatilization tube 9 close to the outer condensation tube 601. A conical flask 603 is installed on the end of the outer condensation tube 601 away from the volatilization tube 9. A jacket 604 is slidably connected to the outer periphery of the condensation tube 601. A connecting rod 605 is fixed on the side of the jacket 604 close to the water tank 4. The side of the connecting rod 605 away from the spiral condensation tube 602 is fixed to the side of the water tank 4 close to the outer condensation tube 601. An ice bath assembly 5 is provided on the side of the conical flask 603 away from the outer condensation tube 601.

[0042] In the present invention, the spiral condenser 602 is connected to the volatilization tube 9. When the volatiles enter the spiral condenser 602 from the volatilization tube 9, preliminary condensation is achieved through heat exchange with the outside world, so that the gaseous volatiles are converted into liquid, which effectively avoids the material loss caused by the direct discharge of the volatiles. The conical flask 603 connected to one end of the condensation outer tube 601 is used to collect the condensed liquid substance. The jacket 604 on the outer periphery of the condensation outer tube 601 is fixedly connected to the water tank 4 through the connecting rod 605 to ensure the stability of the condensation outer tube 601.

[0043] Please refer to the attached Fig. 9 The filter assembly 3 includes a filter box 301, which is installed on the side of the connecting pipe 209 away from the heating box 201. A filter plate 302 is slidably connected inside the filter box 301, and a drain pipe 303 is installed on the side of the filter box 301 close to the water tank 4.

[0044] In the present invention, the filter box 301 and the filter plate 302 are used to filter the used heating water in the heating box 201, so that the used heating water can be recycled for a second time.

[0045] Please refer to the attached Figure 7 - Attachment Figure 8 The ice bath assembly 5 includes an ice bath box 501, which is installed on the side of the conical flask 603 away from the condensation outer tube 601, a refrigerator 506 is fixed on the side of the ice bath box 501 away from the volatile bottle 7, a fan 504 is installed on the side of the refrigerator 506 away from the ice bath box 501, a refrigeration pipe 505 is fixed on the side of the refrigerator 506 close to the ice bath box 501, a water inlet plate 208 is provided on the side of the interior of the ice bath box 501 close to the water tank 4, the water inlet plate 1 208 and the water inlet plate 2 503 are connected to the water tank 4 through pipes, and a temperature display screen 2 502 is provided on the side of the ice bath box 501 away from the water tank 4.

[0046] In the present invention, the ice bath box 501 is used to provide a low temperature environment for the conical flask 603, and the refrigerator 506 cools the ice bath box 501 through the refrigeration tube 505 to reduce the temperature in the ice bath box 501, effectively preventing the condensed liquid compounds in the conical flask 603 from volatilizing again, ensuring the integrity of the sample collection, and the fan 504 is used to assist in heat dissipation to improve the working efficiency and stability of the refrigerator 506. The water inlet plate 503 is used to inject water into the ice bath box 501. The temperature display screen 502 can display the temperature in the ice bath box 501 in real time, which is convenient for the operator to monitor and adjust the working status of the refrigerator 506.

[0047] Please see attached Figure 6 The fixing component 10 includes a shell 1001, which is fixed to the outside of the support plate 202. The front and rear sides of the shell 1001 are slidably connected with the dial plates 1002. The opposite sides of the two dial plates 1002 are fixed with partitions 1003. The spring 1005 is sleeved on the outer periphery of the slide rod 1006. The opposite sides of the two dial plates 1002 are fixed with an insertion rod 1004. The slide rod 1006 is slidably connected to the inside of the dial plates 1002 and the insertion rod 1004. The spring 1005 is fixed to the side of the dial plate 1002 close to the slide rod 1006. A slot 1007 is opened inside the heating box 201, and the insertion rod 1004 is slidably connected inside the slot 1007.

[0048] In the present invention, the shell 1001 is fixed on the outside of the support plate 202 to provide protection for the internal parts. The dial plate 1002 is connected to the insertion rod 1004. When the dial plate 1002 moves, the insertion rod 1004 can be driven to move together. The dial plate 1002 and the insertion rod 1004 both slide on the outer periphery of the slide bar 1006. When the dial plate 1002 moves, it will move along the slide bar 1006. The spring 1005 is sleeved on the outer periphery of the slide bar 1006. When the dial plate 1002 moves along the slide bar 1006, it will squeeze the spring 1005. After the dial plate 1002 loses its active force, the spring 1005 will also lose the squeezing force of the dial plate 1002, so that the spring 1005 will produce a reset movement, apply a thrust to the dial plate 1002, and push the dial plate 1002 to move.

[0049] The present invention also provides a nitrogen-based pretreatment method for complex matrix samples, comprising the following steps:

[0050] S1. Place the volatilization bottle 7 filled with wastewater on the top of the support plate 202, adjust the position of the support plate 202 according to the size of the volatilization bottle 7, and fix the insertion rod 1004 into the slot 1007 through the cooperation between the dial plate 1002 and the spring 1005 to ensure that the nitrogen inlet pipe 8 and the volatilization tube 9 are smoothly inserted into the volatilization bottle 7.

[0051] S2, start the nitrogen tank 1, and deliver nitrogen to the volatilization bottle 7 through the nitrogen inlet pipe 8. At the same time, start the heater 204 and the water inlet plate 208, and inject water into the heating box 201 through the water inlet plate 208. The heating tube 205 heats the volatilization bottle 7 after heating, so as to promote the volatilization of volatile compounds in the wastewater.

[0052] S3, the volatile compounds enter the spiral condenser 602 through the volatilization tube 9, and the circulating cooling water in the condensation outer tube 601 is provided by the water tank 4, which takes away the heat of the volatiles, condenses the compounds into liquid and flows into the conical flask 603.

[0053] S4. After the liquid compound enters the conical flask 603, the water inlet plate 503 is started to inject water into the ice bath box 501, and the refrigerator 506 and the refrigeration tube 505 are started at the same time. The low-temperature ice bath is used to suppress the secondary volatilization of the liquid compound to ensure its stable storage.

[0054] S5. After the pretreatment is completed, the wastewater in the heating box 201 is transported to the filter box 301 through the connecting pipe 209, filtered through the filter plate 302, and discharged through the drain pipe 303, completing the pretreatment work.

[0055] Working principle: When performing pretreatment, first place the volatilization bottle 7 containing wastewater on the top of the support plate 202. According to the size of the volatilization bottle 7, adjust the position of the support plate 202 to ensure that the volatilization bottle 7 is not too low, so that the nitrogen inlet pipe 8 and the volatilization tube 9 can be smoothly inserted into the volatilization bottle 7. By relatively moving the two paddles 1002, the paddles 1002 move along the slide rod 1006 and compress the spring 1005. When the paddles 1002 move, the insertion rod 1004 will slide out of the slot 1007. When the two paddles 1002 are moved, the insertion rod 1004 will slide out of the slot 1007. When the plate 1002 moves to the limit position, the support plate 202 can rise. According to the position of the slot 1007, after the support plate 202 moves to the appropriate position, the plate 1002 is released. At this time, the spring 1005 loses the compression of the plate 1002, and a reset action is generated, pushing the plate 1002 to move, so that the insertion rod 1004 slides into the slot 1007, thereby fixing the position of the support plate 202. Then, the volatilization bottle 7 is placed on the placement plate 203, and the nitrogen inlet pipe 8 and the volatilization tube 9 are inserted into the volatilization bottle 7;

[0056] After the nitrogen inlet pipe 8 and the volatilization tube 9 are inserted into the volatilization bottle 7, the nitrogen tank 1 is started, and nitrogen is transported into the volatilization bottle 7 through the nitrogen inlet pipe 8. At the same time, the heater 204 and the water inlet plate 208 are started, and water is injected into the heating box 201 through the water inlet plate 208. After the heater 204 is started, the temperature of the heating tube 205 increases, and the water temperature in the heating box 201 also increases accordingly, so that the compounds in the volatilization bottle 7 are volatilized, and the volatilized compounds enter the spiral condenser 602 through the volatilization tube 9;

[0057] After the compound enters the spiral condenser 602, water is injected into the condenser outer tube 601 through the water tank 4. When the compound flows in the spiral condenser 602, the cooling water in the condenser outer tube 601 will take away the heat of the compound to achieve the condensation effect. Subsequently, the compound flows into the conical flask 603 in liquid form. After the liquid compound enters the conical flask 603, the water inlet plate 2 503 is started to inject water into the ice bath box 501, and the refrigerator 506 is started at the same time to reduce the temperature of the refrigeration tube 505 to achieve the ice bath effect. The ice bath effect and the multiple conical flasks 603 designed in series can prevent the liquid compound from volatilizing again.

[0058] After the pretreatment work is completed, all programs are closed, and the used water resources in the heating box 201 are transported to the filter box 301 through the connecting pipe 209. After being filtered by the filter plate 302, it is discharged through the drain pipe 303 for easy collection.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen-based pretreatment device for complex matrix samples, comprising a nitrogen tank (1), characterized in that: A nitrogen inlet pipe (8) is installed on the top of the nitrogen tank (1); a volatilization bottle (7) is installed on one end of the nitrogen inlet pipe (8) away from the nitrogen tank (1); a heating mechanism (2) is provided at the bottom of the volatilization bottle (7); a volatilization tube (9) is installed on one side of the top of the volatilization bottle (7) away from the nitrogen inlet pipe (8); a condensation assembly (6) is installed on one end of the volatilization tube (9) away from the volatilization bottle (7); a water tank (4) is provided on the rear side of the condensation assembly (6); and a water inlet pipe (11) is provided on the top of the water tank (4); The heating mechanism (2) comprises a heating box (201), the heating box (201) being arranged on the outer periphery of the volatile bottle (7), a support plate (202) being slidably connected inside the heating box (201), a placement plate (203) being provided on the side of the support plate (202) close to the volatile bottle (7), heaters (204) being installed on both the front and rear sides of the heating box (201), heating tubes (205) being provided on the opposite sides of the two heaters (204), and the heating box (201) ) is provided with a temperature display screen (207) on the front side, a temperature sensor (206) is provided on the internal front side of the heating box (201), a water inlet plate (208) is provided on the side of the heating box (201) away from the temperature sensor (206), a filter assembly (3) is provided on the side of the heating box (201) away from the volatile bottle (7), fixing assemblies (10) are provided on the left and right sides of the support plate (202), and a connecting pipe (209) is provided in the middle of the heating box (201).

2. A nitrogen-based complex matrix sample pretreatment device according to claim 1, characterized in that: The condensation assembly (6) comprises an outer condensation tube (601), wherein the outer condensation tube (601) is installed on the outer periphery of one end of the volatile tube (9) away from the volatile bottle (7), a spiral condensation tube (602) is installed inside the outer condensation tube (601), the top of the spiral condensation tube (602) is installed on the end of the volatile tube (9) close to the outer condensation tube (601), a conical flask (603) is installed on the end of the condensation tube (601) away from the volatile tube (9), a jacket (604) is slidably connected to the outer periphery of the condensation tube (601), a connecting rod (605) is fixed on the side of the jacket (604) close to the water tank (4), the side of the connecting rod (605) away from the spiral condensation tube (602) is fixed on the side of the water tank (4) close to the outer condensation tube (601), and an ice bath assembly (5) is provided on the side of the conical flask (603) away from the condensation outer tube (601).

3. The nitrogen-based pretreatment device for complex matrix samples according to claim 1, characterized in that: The filter assembly (3) comprises a filter box (301), the filter box (301) being installed on a side of the connecting pipe (209) away from the heating box (201), a filter plate (302) being slidably connected inside the filter box (301), and a drain pipe (303) being installed on a side of the filter box (301) close to the water tank (4).

4. The nitrogen-based pretreatment device for complex matrix samples according to claim 2, characterized in that: The ice bath assembly (5) comprises an ice bath box (501), wherein the ice bath box (501) is installed on a side of the conical flask (603) away from the condensing outer tube (601), a refrigerator (506) is fixed on a side of the ice bath box (501) away from the volatile bottle (7), a fan (504) is installed on a side of the refrigerator (506) away from the ice bath box (501), a refrigeration pipe (505) is fixed on a side of the refrigerator (506) close to the ice bath box (501), a second water inlet plate (503) is provided on a side of the interior of the ice bath box (501) close to the water tank (4), and a second temperature display screen (502) is provided on a side of the ice bath box (501) away from the water tank (4).

5. The nitrogen-based pretreatment device for complex matrix samples according to claim 1, characterized in that: The fixing assembly (10) comprises a shell (1001), wherein the shell (1001) is fixed to the outside of the support plate (202), the front and rear sides of the shell (1001) are slidably connected with a dial plate (1002), the opposite sides of the two dial plates (1002) are fixed with an insertion rod (1004), the dial plates (1002) and the insertion rod (1004) are slidably connected with a sliding rod (1006) inside, a spring (1005) is fixed on the side of the dial plate (1002) close to the sliding rod (1006), and a slot (1007) is opened inside the heating box (201).

6. The nitrogen-based pretreatment device for complex matrix samples according to claim 1, characterized in that: A flow meter (12) is installed in the middle of the nitrogen inlet pipe (8), and a flow display screen (13) is installed on the top of the flow meter (12).

7. The nitrogen-based pretreatment device for complex matrix samples according to claim 4, characterized in that: The side of the volatilizer bottle (7) close to the heating box (201) is slidably connected to the top of the placement plate (203), and the water inlet plate 1 (208) and the water inlet plate 2 (503) are both connected to the water tank (4) through a pipeline.

8. The nitrogen-based pretreatment device for complex matrix samples according to claim 5, characterized in that: A partition plate (1003) is fixed on the opposite side of the two shifting plates (1002), and the spring (1005) is sleeved on the outer periphery of the sliding rod (1006).

9. The nitrogen-based pretreatment device for complex matrix samples according to claim 5, characterized in that: The insertion rod (1004) is slidably connected inside the slot (1007).

10. A method for pretreating complex matrix samples based on nitrogen, according to a device for pretreating complex matrix samples based on nitrogen according to claims 1-9, characterized in that: The following steps are involved: S1. Place the volatilization bottle (7) containing wastewater on the top of the support plate (202), adjust the position of the support plate (202) according to the size of the volatilization bottle (7), and fix the insertion rod (1004) into the slot (1007) through the cooperation between the dial plate (1002) and the spring (1005), so as to ensure that the nitrogen inlet pipe (8) and the volatilization tube (9) are smoothly inserted into the volatilization bottle (7). S2, start the nitrogen tank (1), and deliver nitrogen to the volatilization bottle (7) through the nitrogen inlet pipe (8), and at the same time start the heater (204) and the water inlet plate (208), and inject water into the heating box (201) through the water inlet plate (208), and heat the volatilization bottle (7) after the heating pipe (205) is heated, so as to promote the volatilization of volatile compounds in the wastewater. S3, the volatile compounds enter the spiral condenser (602) through the volatilization tube (9), and the circulating cooling water in the condensation outer tube (601) is provided by the water tank (4), which takes away the heat of the volatiles, condenses the compounds into liquid and flows into the conical flask (603). S4. After the liquid compound enters the conical flask (603), the water inlet plate 2 (503) is started to inject water into the ice bath box (501), and the refrigerator (506) and the refrigeration tube (505) are started at the same time. The secondary volatilization of the liquid compound is suppressed by the low-temperature ice bath to ensure its stable storage. S5. After the pretreatment is completed, the wastewater in the heating box (201) is transported to the filter box (301) through the connecting pipe (209), filtered through the filter plate (302), and discharged through the drain pipe (303), completing the pretreatment work.

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