Perfluorinated compound detection device and method for extracting organic materials of food

Abstract

The invention relates to a device and a method for detecting perfluorinated compounds extracted from food organic materials, and relates to the field of compound detection.The device comprises a mounting platform, an enrichment element, a high-voltage power supply, a mass spectrometer, a first elution needle, a first micro-injection pump, a second elution needle, a second micro-injection pump, a conical barrel, an ejection barrel, an intermittent triggering assembly and a rotation driving assembly; the first elution needle is located right above the large end of the pointed cone part, the conical barrel is located right below the enrichment element, and an included angle smaller than 90 degrees is formed between the axis of the conical barrel and the axis of the enrichment element; the second elution needle is used for conveying eluent into the ejection cylinder; the intermittent triggering assembly is used for applying an acting force to the ejection cylinder so as to eject the eluent in the ejection cylinder to the pointed cone part. The ionization spray stability can be improved, meanwhile, the dripping loss condition is reduced, and therefore the accuracy of the detection result is ensured.

Description

Technical Field

[0001] The present application relates to the field of compound detection, and in particular to a device and method for detecting perfluorinated compounds extracted from food organic materials. Background Art

[0002] Perfluorinated compounds (PFCs) were invented in the 1930s. They have hydrophobic and lipophobic properties as well as chemical and thermal stability. They are widely used in food packaging materials, water-resistant and adhesion-resistant textiles, non-stick pan linings and other daily consumer products. Studies have shown that PFCs can persist and gradually accumulate in the environment and organisms. PFCs remaining in the environment will eventually cause harm to the human body as they are enriched in the food chain. Therefore, the detection of trace PFCs in food is particularly important.

[0003] The Chinese patent application number CN202311116158.0 discloses an enrichment ionization integrated mass spectrometry detection device for detecting perfluorinated compounds and its application, which includes: an ion source platform, an enrichment element, a high-voltage power supply, an elution needle, a microinjection pump and a mass spectrometer. The enrichment element includes: a non-metallic base rod and a functional material layer, the functional material layer is located on at least a portion of the surface of the base rod, the functional material layer is formed by a molecular imprinting polymer and a graphene oxide composite material, and the functional material layer specifically adsorbs perfluorinated compounds; the high-voltage power supply is connected to the enrichment element, and the injection port of the mass spectrometer is arranged opposite to the tip of the enrichment element.

[0004] The detection method comprises the following steps: contacting the sample to be tested with an enrichment element, wherein the enrichment element is a base rod modified by a molecular imprinting polymer / graphene oxide composite material, has good specificity for adsorption and enrichment of perfluoro compounds, and has strong adsorption force; the enrichment element extracts the perfluoro compounds in the sample to be tested to obtain an enrichment element that adsorbs the perfluoro compounds; a microinjection pump is used to continuously drip a spray desorption solvent onto the surface of the enrichment element to desorb the extracted perfluoro compounds to obtain desorbed perfluoro compounds; and a high-voltage power supply is used to ionize the desorbed perfluoro compounds and enter a mass spectrometer for detection to obtain the content of the perfluoro compounds in the sample to be tested.

[0005] However, when the eluent addition flow rate is low, the spray consumes the eluent too quickly, resulting in unstable ionization spray and reduced ionization efficiency, leading to low detection results; and when the eluent flow rate is high, the eluent supply is too high, and there is no time to form a spray and drip loss from the enrichment element, resulting in low detection results. Summary of the invention

[0006] In order to improve the stability of ionized spray and reduce the occurrence of dripping loss, the present application provides a device and method for detecting perfluorinated compounds extracted from food organic materials.

[0007] The present application provides a device for detecting perfluorinated compounds extracted from food organic materials, which adopts the following technical solution: A perfluorinated compound detection device for extracting organic materials from food, comprising a mounting platform, an enrichment element, a high voltage power supply, a mass spectrometer, a first elution needle and a first micro-injection pump, wherein the enrichment element is arranged horizontally, one end of the enrichment element is set as a pointed cone, the enrichment element comprises a base rod and a functional material layer attached to the surface of the base rod, characterized in that it also comprises a second elution needle, a second micro-injection pump, a conical cylinder, an ejection cylinder, an intermittent triggering assembly and a rotation driving assembly, wherein the rotation driving assembly is used to drive the enrichment element to rotate around its own axis, the first elution needle is located directly above the large end of the pointed cone, and the first micro-injection pump is located at a position close to the first elution needle. The microinjection pump is used to deliver eluent to the first elution needle; the conical cylinder is located directly below the enrichment element, the conical cylinder is made of rubber, has a large port and a small port, the large port of the conical cylinder faces upward and is inclined toward the pointed cone, the axis of the conical cylinder and the axis of the enrichment element have an angle less than 90°, and the ejection cylinder is fixed to the small port of the conical cylinder; the second microinjection pump is used to deliver eluent to the second elution needle, and the second elution needle is used to deliver eluent to the ejection cylinder; the intermittent trigger assembly is used to apply force to the ejection cylinder to eject the eluent in the ejection cylinder to the pointed cone.

[0008] By adopting the above technical scheme, during detection, the sample to be tested is brought into contact with the enrichment element, the enrichment element extracts the perfluorinated compounds in the sample to be tested, the first micro-injection pump delivers eluent to the first elution needle, the eluent of the first elution needle is dripped onto the pointed cone, the rotating drive assembly drives the enrichment element to rotate slowly, so that the eluent located above the pointed cone gradually moves to the lowest point of the pointed cone, and at the same time, the second micro-injection pump delivers eluent to the second elution needle, the eluent of the second elution needle drips onto the ejection tube, and under the action of the intermittent trigger assembly, the eluent in the ejection tube is ejected to the lowest point of the pointed cone, the two eluents merge, and, due to The eluent ejected by the ejection tube has a large kinetic energy, and there is an angle between the ejection path and the pointed cone portion. Therefore, after the two eluents are gathered, they will continue to move along the surface of the pointed cone portion toward the tip of the pointed cone portion, so that the eluent quickly covers the surface of the pointed cone portion, and the desorption effect is better. At the same time, the tension of the eluent is large, and the tension of the eluent is greater than its own gravity. The eluent is not easy to drip and lose from the pointed cone portion. Moreover, since the enrichment element continues to rotate slowly, the covered eluent will be gradually brought to a high place by the enrichment element, making the eluent less likely to fall and lose, thereby improving the stability of the ionization spray and reducing the dripping loss, thereby ensuring the detection accuracy.

[0009] In this process, if there is dripping loss of the first elution needle, the conical tube can also receive the dripping eluate and collect it into the ejection tube to repeatedly eject it onto the enrichment element.

[0010] Finally, the desorbed perfluorinated compounds are ionized by a high voltage power supply and enter the mass spectrometer through the injection port of the mass spectrometer for detection.

[0011] By arranging a rotating drive component, a second elution needle, a conical cylinder, an ejection cylinder and an intermittent trigger component, the two eluents can be brought together. At the same time, the ejection kinetic energy and the ejection angle are utilized to allow the eluent to quickly cover the surface of the pointed cone, resulting in a better desorption effect. At the same time, the tension of the flattened and covered eluent is relatively large, and the tension of the eluent is greater than its own gravity. The eluent is not easy to drip and be lost from the pointed cone, thereby achieving both improved ionization spray stability and reduced dripping losses, thereby ensuring detection accuracy.

[0012] Optionally, the mounting platform is provided with a bracket, and the large port of the conical tube is fixedly connected to the bracket. The intermittent trigger assembly includes a first motor, a cam, a spring and a striking rod. The striking rod is located below the ejection tube, and the striking rod is slidably connected to the bracket. The sliding direction of the striking rod is the axial direction of the ejection tube. The first motor is used to drive the cam to rotate, and the spring is used to force one end of the striking rod to abut against the outer peripheral surface of the cam. The cam is used to drive the striking rod to slide toward the ejection tube and make one end of the striking rod hit the outer bottom surface of the ejection tube.

[0013] By adopting the above technical solution, the first motor drives the cam to rotate continuously, and the irregular outer peripheral surface of the cam abuts against the end of the striking rod and the spring resets, so that the striking rod moves back and forth at high speed, and the striking rod strikes the outer bottom of the ejection tube at a high frequency, while the ejection tube is in an elastic fixed state (the ejection tube is connected to the bracket through a conical tube made of rubber material). The ejection tube is elastically displaced, and the impact force of the striking rod is transmitted to the eluent in the ejection tube through the ejection tube to vibrate the eluent out of the ejection tube. Under the guidance of the tube mouth of the ejection tube, the ejection path of the eluent is determined, and the eluent is ejected to the lowest point of the pointed cone more accurately.

[0014] In addition, the rubber conical tube can quickly restore its deformation, allowing the ejection tube to quickly reset for the next strike.

[0015] Optionally, the mounting platform is provided with a bracket, the large port of the conical cylinder is fixedly connected to the bracket, the intermittent trigger assembly includes two second motors and two rotating shafts, two symmetrically arranged protrusions are fixed on the outer circumference of the ejection cylinder, the second motor is fixedly connected to the bracket, the two second motors are symmetrically arranged around the axis of the ejection cylinder, the rotating shaft is fixed to the output shaft of the second motor, and a plurality of circumferentially evenly arranged trigger rods are fixed on the outer circumference of the rotating shaft, the protrusion is located on the circumferential movement path of the end of the trigger rod, and the movement path of the protrusion driven by the trigger rod intersects with the movement path of the end of the trigger rod.

[0016] By adopting the above technical solution, the second motor drives the rotating shaft to rotate continuously, the trigger rod abuts against the protrusion, and the trigger rod drives the ejection tube to move axially through the protrusion, so that the conical tube is axially elastically stretched. When the rotating shaft rotates until the trigger rod is separated from the protrusion, the trigger rod has no force on the ejection tube, the conical tube quickly recovers its deformation, and the ejection tube quickly resets. Under the action of inertia, the eluent in the ejection tube is ejected, and the eluent is guided by the mouth of the ejection tube. The ejection path of the eluent is determined, and the eluent is ejected to the lowest point of the pointed cone more accurately.

[0017] Optionally, the base rod includes a main body and the pointed cone portion, the pointed cone portion is divided into a junction block and a covering block along its own axial direction, the surfaces of the junction block and the covering block are covered with the functional material layer, the junction block is integrally connected to the main body, the functional material layer on the end face of the covering block is in contact with the functional material layer on the end face of the junction block, the landing point of the first elution needle is located at the junction block, and the landing point of the ejection tube is located at the junction block; the rotation drive assembly includes a third motor, a first large gear, a first small gear, a second large gear and a second small gear, the mounting platform is fixed with a vertical rod, the vertical rod is fixed with a fixing ring, the outer side of the fixing ring is rotatably connected with a rotating ring, and the main body and the rotating The ring is detachably connected, the first large gear is coaxially fixed to the outside of the rotating ring, the covering block is fixed with a first rotating rod, the first rotating rod passes through a first through hole opened at the axis of the main body, a rubber ring is provided between the first rotating rod and the inner wall of the first through hole, and the second small gear is coaxially fixed to the end of the first rotating rod; the first small gear and the second large gear are both fixed to the output shaft of the third motor, the first small gear is meshed with the first large gear, the outer peripheral surface of the second large gear has a plurality of tooth segments evenly spaced circumferentially, and there is an idle section between adjacent tooth segments, and the tooth segments are meshed with the second small gear; when the ejection tube ejects the eluent, the tooth segments are meshed with the second small gear.

[0018] By adopting the above technical solution, the third motor drives the main body and the conduit block to rotate slowly through the meshing of the first small gear and the first large gear, so as to facilitate the downward transfer of the elution liquid of the first elution needle. At the same time, due to the rubber ring, there is damping between the first rotating rod and the main body, and the rotational torque of the main body will also be transmitted to the first rotating rod and the covering block, so that the covering block rotates slowly; and when the third motor drives the tooth segment of the second large gear to mesh with the second small gear, due to the higher gear ratio, the first rotating rod and the covering block will rotate quickly by an angle, and since the tooth segments are arranged at intervals, the covering block will intermittently rotate quickly by an angle.

[0019] Therefore, the slowly rotating main body and the confluence block can ensure the downward transfer of the eluate of the first elution needle, so that the eluate is merged with the eluate of the ejection tube. Due to the kinetic energy of the ejection tube, the gathered eluate will be spread and covered along the surface of the covering block. Due to the intermittent rapid rotation angle of the covering block, the spread eluate can be quickly brought to a higher position in time to reduce the loss of the spread eluate due to dripping under the action of gravity.

[0020] Optionally, the base rod includes a main body and the pointed cone portion, the surfaces of the main body and the pointed cone portion are both covered with the functional material layer, and the functional material layer on the end face of the pointed cone portion is in contact with the functional material layer on the end face of the main body; the mounting platform is fixed with a vertical rod, the vertical rod is fixed with a fixed ring, a rotating ring is rotatably connected to the outer side of the fixed ring, the main body and the rotating ring are detachably connected, the pointed cone portion is fixed with a second rotating rod, and the second rotating rod passes through a second through hole opened at the axis of the main body; the main body is fixed with an odd number of strip-shaped substrates, the substrates extend along the generatrix direction of the pointed cone portion, there is a gap between the inner surface of the substrate and the outer surface of the pointed cone portion, the surface of the substrate is covered with the functional material layer, wherein the substrate located directly below corresponds to the ejection landing point of the ejection tube; the rotation drive assembly includes a fourth motor and a fifth motor, wherein the fourth motor is used to drive the second rotating rod to rotate; the fifth motor is used to drive the main body and the substrates to rotate intermittently, so that each substrate moves intermittently to the ejection landing point of the ejection tube.

[0021] By adopting the above technical solution, by setting an odd number of substrates and limiting one of the substrates to be located directly below the pointed cone portion, the eluent added by the first elution needle will drip directly onto the pointed cone portion through the gap between the two substrates, and the fourth motor will drive the pointed cone portion to rotate slowly through the second rotating rod to gradually transfer the eluent to the lowest point of the pointed cone portion, so that the subsequent eluent of the first elution needle can be dripped more evenly to various circumferential positions of the pointed cone portion, and more eluent located at the lowest point of the pointed cone portion will drip downward to the inner surface of the substrate facing the pointed cone portion, that is, the inner surface of the substrate will receive the excess eluent. At the same time, the substrate located directly below corresponds to the ejection landing point of the ejection tube, that is, the eluent of the ejection tube will also cover the outer surface of the substrate, so that the surface of the pointed cone portion, the inner surface of the substrate, and the outer surface of the substrate are all covered with eluent, which greatly increases the contact area of ​​the eluent, and finally cooperates with the ionization of the substrate and the pointed cone portion to ionize the target object.

[0022] Through the three-dimensional double-layer structure composed of the substrate and the pointed cone, and in conjunction with the dripping of the first elution needle, the natural dripping due to gravity and the landing point control of the ejection tube, the surface of the pointed cone, the inner surface of the substrate and the outer surface of the substrate are all covered with eluent, which greatly increases the contact area of ​​the eluent and the dripping amount of the eluent, thereby greatly improving the effect of the ionization spray and ensuring the accuracy of detection.

[0023] The present application provides a method for detecting perfluorinated compounds extracted from food organic materials, which adopts the following technical scheme: A method for detecting perfluorinated compounds extracted from food organic materials, comprising the following steps: contacting a sample to be tested with the enrichment element of the perfluorinated compound detection device extracted from food organic materials, and extracting perfluorinated compounds in the sample to be tested by the enrichment element; The first micro-injection pump delivers eluent to the first elution needle, and the eluent of the first elution needle is dripped onto the pointed cone portion. The rotating driving component drives the enrichment element to rotate, so that the eluent on the surface of the pointed cone portion gradually moves to the lowest point of the pointed cone portion. The second micro-injection pump delivers eluent to the second elution needle, and the eluent of the second elution needle drips onto the ejection cylinder. Under the action of the intermittent triggering component, the eluent in the ejection cylinder is ejected to the lowest point of the pointed cone portion. The two eluents converge and move toward the tip of the pointed cone portion. The eluent covers the pointed cone portion to desorb the perfluorinated compound. The desorbed perfluorinated compound is ionized by a high voltage power supply and enters the mass spectrometer through the injection port of the mass spectrometer for detection.

[0024] Optionally, the detection mode of the mass spectrometer is multiple reaction monitoring (MRM).

[0025] Optionally, the distance between the tip of the cone portion and the injection port of the mass spectrometer is 4-6 cm.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: By setting a rotating drive component, a second elution needle, a conical cylinder, an ejection cylinder and an intermittent trigger component, the two eluents can be brought together, and the ejection kinetic energy and the ejection angle are used to make the eluent quickly cover the surface of the sharp cone, so that the desorption effect is better. At the same time, the tension of the eluent that is spread and covered is relatively large, and the tension of the eluent is greater than its own gravity, so the eluent is not easy to drip and lose from the sharp cone, thereby improving the stability of the ionization spray and reducing the dripping loss, thereby ensuring the detection accuracy; By setting the third motor, the first large gear, the first small gear, the second large gear, the second small gear and the covering block, the covering block is intermittently and rapidly rotated at an angle. Therefore, when the ejected eluent is flattened and covers the lowest point of the covering block, the covering block is rapidly rotated at an angle to quickly bring the flattened eluent to a higher position, so as to reduce the occurrence of the flattened eluent flowing and dripping loss under the action of gravity; Through the three-dimensional double-layer structure composed of the substrate and the pointed cone, and in conjunction with the dripping of the first elution needle, the natural dripping due to gravity and the landing point control of the ejection tube, the surface of the pointed cone, the inner surface of the substrate and the outer surface of the substrate are all covered with eluent, which greatly increases the contact area of ​​the eluent and the dripping amount of the eluent, thereby greatly improving the effect of the ionization spray and ensuring the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall device of Example 1.

[0028] Figure 2 It is a schematic diagram of Example 1 for demonstrating the matching relationship between the rotation drive assembly and the enrichment element.

[0029] Figure 3 It is a schematic diagram of the conical cylinder of Example 1.

[0030] Figure 4 It is a schematic diagram of the overall device of Example 2.

[0031] Figure 5 It is a schematic diagram of the conical cylinder of Example 2.

[0032] Figure 6 It is a schematic diagram of the overall device of Example 3.

[0033] Figure 7 It is a schematic diagram of Example 3 for demonstrating the matching relationship between the rotation drive assembly and the enrichment element.

[0034] Figure 8 It is a schematic diagram of Example 3 for demonstrating the matching relationship between the second large gear and the second small gear.

[0035] Fig. 9 It is a schematic diagram of the overall device of Example 4.

[0036] Fig.10 is a schematic diagram of the enrichment element of Example 4.

[0037] Fig.11 It is a schematic diagram of Example 4 for demonstrating the matching relationship between the rotation drive assembly and the enrichment element.

[0038] Fig.12 This is a cross-sectional view of the tapered portion of Example 4.

[0039] Explanation of reference numerals: 1. enrichment element; 2. rotation drive assembly; 3. conical cylinder; 5. intermittent trigger assembly; 10. mounting platform; 101. bottom plate; 102. slider; 103. screw rod; 105. vertical rod; 106. fixing ring; 107. rotating ring; 108. bolt; 11. pointed cone; 111. cover block; 112. confluence block; 113. first rotating rod; 115. second rotating rod; 12. main body; 121. first perforation; 122. rubber ring; 123. second perforation; 125. card slot; 13. substrate; 131. card block; 20. mass spectrometer; 200. injection port; 201. high voltage power supply; 202. first elution needle; 203. first Microinjection pump; 204, second elution needle; 205, second microinjection pump; 21, sixth motor; 211, first driving gear; 212, first driven gear; 22, third motor; 221, first pinion; 222, second large gear; 2221, tooth segment; 2222, idle segment; 223, first large gear; 224, second pinion; 23, fifth motor; 231, second driving gear; 232, second driven gear; 25, fourth motor; 31, ejection tube; 311, convex block; 32, bracket; 33, ring body; 35, slide tube; 51, cam; 52, striking rod; 521, convex ring; 53, spring; 55, rotating shaft; 56, trigger rod. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1 -Attached Fig.12 This application is described in further detail.

[0041] Example 1, Example 1 discloses a perfluorinated compound detection device for extracting organic materials from food, such as Figure 1As shown, the perfluorinated compound detection device for extraction of food organic materials includes a mounting platform 10, an enrichment element 1, a high-voltage power supply 201, a mass spectrometer 20, a first elution needle 202, a first micro-injection pump 203, a second elution needle 204, a second micro-injection pump 205, a conical cylinder 3, an ejection cylinder 31, an intermittent trigger assembly 5 and a rotation drive assembly 2, wherein the mass spectrometer 20 is open and has an injection port 200 on one side of the mass spectrometer 20.

[0042] The enrichment element 1 includes a base rod and a functional material layer attached to the surface of the base rod. The preparation method of the enrichment element 1 of the present application is consistent with the preparation method of the enrichment element 1 in the Chinese patent application number CN202311116158.0.

[0043] like Figure 1 , Figure 2 As shown, the mounting platform 10 is used to mount the enrichment element 1 so that it remains in a horizontal state, wherein the mounting platform 10 may be fixed or adjustable. In the present embodiment, the mounting platform 10 is adjustable, specifically, the mounting platform 10 comprises a base plate 101, a slider 102 and a screw rod 103, one side of the base plate 101 abuts against the outer surface of the mass spectrometer 20, and the base plate 101 is movably placed on the desktop so that the base plate 101 can be moved relative to the mass spectrometer 20, the screw rod 103 is horizontally arranged, and the two ends of the screw rod 103 are rotatably connected to the two sides of the base plate 101 respectively, the lower surface of the slider 102 is attached to the upper surface of the base plate 101, and the screw rod 103 is threadedly passed through the slider 102, that is, the sliding position of the slider 102 relative to the base plate 101 is adjusted by rotating the screw rod 103; a vertical rod 105 is fixed on the slider 102, and the enrichment element 1 is arranged on the vertical rod 105.

[0044] The base rod includes a main body 12 and a pointed cone portion 11. The main body 12 is cylindrical. In this embodiment, the main body 12 and the pointed cone portion 11 are integrally formed and connected. The surfaces of the pointed cone portion 11 and the main body 12 both have the above-mentioned functional material layer. The pointed cone portion 11 is closer to the injection port 200 of the mass spectrometer 20 than the main body 12. The vertical rod 105 is fixed with a fixed ring 106, and the fixed ring 106 is coaxially arranged with the enrichment element 1. The outer side of the fixed ring 106 is rotatably connected with a rotating ring 107. The moving ring 107 is coaxially arranged with the fixed ring 106, and the main body 12 is detachably connected to the rotating ring 107. Specifically, the end of the main body 12 away from the pointed cone portion 11 is inserted into the fixed ring 106, and the end face and the outer peripheral surface of the main body 12 are both in contact with the inner wall of the fixed ring 106. The rotating ring 107 is threadedly connected with a bolt 108, and the axis of the bolt 108 is perpendicular to the axis of the enrichment element 1, and the end face of the bolt 108 is pressed against the outer peripheral surface of the main body 12 to fix the main body 12.

[0045] Furthermore, the fixed ring 106, the rotating ring 107 and the bolt 108 are all made of conductive materials, and the high voltage power supply 201 is used to supply power to the fixed ring 106, so that current can be conducted to the fixed ring 106, the rotating ring 107, the bolt 108, the main body 12 and the pointed cone 11 to achieve ionization.

[0046] The rotation drive assembly 2 is used to drive the enrichment element 1 to rotate around its own axis. Specifically, the rotation drive assembly 2 includes a sixth motor 21, a first driving gear 211 and a first driven gear 212. The sixth motor 21 is installed on the vertical rod 105, the first driving gear 211 is installed on the output shaft of the sixth motor 21, and the first driven gear 212 is coaxially fixed to the outer side of the rotating ring 107. The first driven gear 212 and the first driving gear 211 are meshed, that is, the torque of the sixth motor 21 is transmitted to the rotating ring 107 through gear matching, and the rotating ring 107 drives the enrichment element 1 to rotate slowly.

[0047] like Figure 1 As shown, the first elution needle 202 is fixed to the vertical rod 105, the first elution needle 202 is vertically arranged, and the lower end of the first elution needle 202 is located directly above the large end of the pointed cone portion 11 (the large end of the pointed cone portion 11 refers to the large diameter position of the pointed cone portion 11), and the first microinjection pump 203 is used to transport eluent to the first elution needle 202, so that the eluent of the first elution needle 202 can drip downward onto the large end of the pointed cone portion 11.

[0048] like Figure 1 , Figure 3 As shown, the conical barrel 3 is located directly below the enrichment element 1, the conical barrel 3 is made of rubber, has a large port and a small port, and is fixedly connected to the vertical rod 105 via a bracket 32. Specifically, the bracket 32 ​​is fixed with a ring body 33, the ring body 33 is coaxially arranged with the conical barrel 3, the large port of the conical barrel 3 is fixed to the ring body 33, the small port of the conical barrel 3 is suspended, and the large port of the conical barrel 3 is upward and inclined toward the pointed cone 11, so that there is an angle between the axis of the conical barrel 3 and the axis of the enrichment element 1, and the angle is less than 90°, preferably 70°.

[0049] The ejection tube 31 is fixed to the small end of the conical tube 3. The ejection tube 31 is coaxially arranged with the conical tube 3, and the inner cavity of the ejection tube 31 is connected with the inner cavity of the conical tube 3. In other embodiments, in order to reduce the residual eluent, the inner wall of the ejection tube 31 and the inner wall of the conical tube 3 are covered with a hydrophobic layer, which can be a Teflon coating.

[0050] The second elution needle 204 is fixed to the vertical rod 105, and the second elution needle 204 is tilted. The liquid outlet end of the second elution needle 204 is located directly above the ejection tube 31, and the second micro-injection pump 205 is used to transport the eluent to the second elution needle 204, so that the second elution needle 204 can drip the eluent into the ejection tube 31.

[0051] like Figure 3 As shown, the intermittent trigger assembly 5 is used to apply a force to the ejection tube 31 to eject the eluent in the ejection tube 31 to the pointed cone portion 11. Specifically, the intermittent trigger assembly 5 includes a first motor, a cam 51, a spring 53 and a striking rod 52. A slide tube 35 is fixed in the bracket 32. The slide tube 35 is coaxially arranged with the ejection tube 31. The slide tube 35 is located below the ejection tube 31. The striking rod 52 is slidably connected to the slide tube 35. The first motor is fixed to the bracket 32 ​​(not shown in the figure). The axis of the output shaft is horizontally perpendicular to the axis of the ejection tube 31, the cam 51 is fixed to the output shaft of the first motor, and the outer peripheral surface of the cam 51 abuts against the end surface of the striking rod 52 away from the ejection tube 31; a convex ring 521 is fixed to the end of the striking rod 52 away from the ejection tube 31, and a spring 53 is sleeved on the outside of the striking rod 52, and the two ends of the spring 53 abut against the end surface of the convex ring 521 and the end surface of the sliding tube 35 respectively. The elastic force of the spring 53 forces one end of the striking rod 52 to always abut against the outer peripheral surface of the cam 51.

[0052] Example 1 also discloses a method for detecting perfluorinated compounds extracted from food organic materials, comprising the following steps: The sample to be tested obtained by extraction is brought into contact with the enrichment element 1 of the above-mentioned perfluorinated compound detection device for extracting perfluorinated compounds from food organic materials, and the enrichment element 1 extracts perfluorinated compounds in the sample to be tested.

[0053] The enrichment element 1 after extraction is installed on the rotating ring 107, and the enrichment element 1 is fixed by bolts 108, so that the enrichment element 1 is in a horizontal state, and the slider 102 is driven to move by the rotation of the screw rod 103 to drive the vertical rod 105 and the enrichment element 1 to move toward the mass spectrometer 20, ensuring that the distance between the tip of the cone 11 and the injection port 200 of the mass spectrometer 20 is 4-6cm.

[0054] The first micro-injection pump 203 delivers eluent to the first elution needle 202. The eluent can be formaldehyde solution. The eluent of the first elution needle 202 is dripped to the large end of the pointed cone 11. The rotation drive component 2 drives the enrichment element 1 to rotate slowly, so that the eluent located above the pointed cone 11 gradually moves to the lowest point of the pointed cone 11. At the same time, the second micro-injection pump 205 delivers eluent to the second elution needle 204. The eluent of the second elution needle 204 drips to the ejection tube 31. Under the action, specifically, the first motor drives the cam 51 to rotate continuously, and the irregular outer peripheral surface of the cam 51 abuts against the end of the striking rod 52 and the spring 53 is reset, so that the striking rod 52 moves back and forth at a high speed, and the striking rod 52 strikes the outer bottom of the ejection tube 31 at a high frequency, and the ejection tube 31 is in an elastic fixed state (the ejection tube 31 is connected to the bracket 32 ​​through the conical tube 3 made of rubber), the ejection tube 31 is elastically displaced, and the impact force of the striking rod 52 is transmitted to the eluent in the ejection tube 31 through the ejection tube 31, so as to The eluent is ejected from the ejection tube 31 (and the rubber conical tube 3 can quickly recover its deformation, so that the ejection tube 31 is quickly reset to facilitate the next strike). Under the guidance of the tube mouth of the ejection tube 31, the ejection path of the eluent is determined, and the eluent is ejected more accurately to the lowest point of the pointed cone 11. The eluent is combined with the eluent dripped by the first elution needle 202. After the combination, the two streams of eluent will continue to move along the surface of the pointed cone 11 toward the tip of the pointed cone 11, so that the eluent quickly covers the pointed cone. The surface of the portion 11 is used to desorb the perfluorinated compound. Since the coverage area is large and uniform, the desorption effect is improved, and the tension of the eluent is large, and the tension of the eluent is greater than its own gravity, and the eluent is not easy to drip and lose from the pointed cone portion 11. Moreover, since the enrichment element 1 continues to rotate slowly, the covered eluent will be gradually brought to a higher place by the enrichment element 1, making it more difficult for the eluent to fall and lose, thereby improving the stability of the ionization spray and reducing the dripping loss, thereby ensuring the detection accuracy.

[0055] The desorbed perfluorinated compound is ionized by a high voltage power supply 201 and enters the mass spectrometer 20 through the injection port 200 of the mass spectrometer 20 for detection. Specifically, the detection method of the mass spectrometer 20 is multiple reaction monitoring (MRM).

[0056] Moreover, in the process of dripping the eluent, in order to improve the stability of the ionization spray, the dripping speed of the first elution needle 202 can be further increased. The eluent may drip from the pointed cone 11. When the dripping loss of the first elution needle 202 occurs, the conical tube 3 can also receive the dripping eluent and collect it into the ejection tube 31 for repeated ejection onto the enrichment element 1, thereby reducing the occurrence of dripping loss.

[0057] Embodiment 2, embodiment 2 is different from embodiment 1 in that, Figure 4 , Figure 5 As shown, the intermittent trigger assembly 5 includes two second motors and two rotating shafts 55. Two symmetrically arranged protrusions 311 are fixed to the outer circumferential surface of the ejection tube 31. The second motor is fixedly connected to the bracket 32 ​​(not shown in the figure). The two second motors are symmetrically arranged with the axis of the ejection tube 31 as the center. The axial direction of the output shaft of the second motor is perpendicular to the axial direction of the ejection tube 31. The rotating shaft 55 is coaxially fixed to the output shaft of the second motor. A plurality of circumferentially evenly arranged trigger rods 56 are fixed to the outer circumferential surface of the rotating shaft 55. In this embodiment, there are two trigger rods 56, which are extended radially along the rotating shaft 55. The protrusion 311 is located on the circumferential movement path of the end of the trigger rod 56, and the movement path of the protrusion 311 driven by the trigger rod 56 intersects with the movement path of the end of the trigger rod 56.

[0058] During ejection, the second motor drives the rotating shaft 55 to rotate continuously ( Figure 5 The direction of the arrow in the figure is the rotation direction of the rotating shaft 55), one end of the trigger rod 56 abuts against the surface of the protrusion 311, and the trigger rod 56 drives the ejection tube 31 to move axially away from the pointed cone portion 11 through the protrusion 311, so that the conical tube 3 is axially elastically stretched. At this time, the rotating shaft 55 continues to rotate, and the trigger rod 56 disengages from the protrusion 311. At this time, the trigger rod 56 has no force on the ejection tube 31, and the conical tube 3 quickly recovers its deformation, and the ejection tube 31 quickly moves axially to reset. Under the action of inertia, the eluent in the ejection tube 31 is ejected, and the eluent is guided by the tube mouth of the ejection tube 31. The ejection path of the eluent is determined, and the eluent is ejected more accurately to the lowest point of the pointed cone portion 11.

[0059] Embodiment 3, embodiment 3 is different from embodiment 2 in that, Figure 6 , Figure 7As shown, the base rod includes a main body 12 and a pointed cone portion 11. The pointed cone portion 11 is divided into a bus block 112 and a cover block 111 along its own axial direction. The bus block 112 is integrally formed and connected with the main body 12, while the cover block 111 and the bus block 112 are separately arranged. The cover block 111 is a pointed cone, and the bus block 112 is a rotating body. The main body 12 and the bus block 112 are both provided with a first through hole 121 at the axis center. A first rotating rod 113 is fixed to one end of the covering block 111. The first rotating rod 113 passes through the first through hole 121, so that The covering block 111 is rotatably connected to the main body 12, the main body 12, the bus block 112, the covering block 111 and the first rotating rod 113 are all made of the same material, and the surfaces of the main body 12, the bus block 112, the covering block 111 and the first rotating rod 113 are all covered with a functional material layer, and the specific preparation method of the functional material layer covered by the main body 12, the bus block 112, the covering block 111 and the first rotating rod 113 is consistent with the functional material layer preparation method in the Chinese patent with application number CN202311116158.0.

[0060] Furthermore, the functional material layer on the end surface of the cover block 111 is in contact with the functional material layer on the end surface of the bus block 112 , so that the current of the main body 12 can be conducted to the bus block 112 and the cover block 111 .

[0061] Furthermore, a rubber ring 122 is disposed between the first rotating rod 113 and the inner wall of the first through hole 121 , so that the first rotating rod 113 and the main body 12 have a damping connection.

[0062] like Figure 7 , Figure 8 As shown, the rotation drive assembly 2 includes a third motor 22, a first large gear 223, a first small gear 221, a second large gear 222 and a second small gear 224, wherein the third motor 22 is installed on the vertical rod 105, the first small gear 221 and the second large gear 222 are both fixed to the output shaft of the third motor 22, the first large gear 223 is coaxially fixed to the outer side of the rotating ring 107, and the first large gear 223 is meshed with the first small gear 221; the second small gear 224 is coaxially fixed to the end of the first rotating rod 113 (the matching form of the second small gear 224 and the first rotating rod 113 is a key and keyway matching, wherein the key is located at the second small gear 224), the outer circumferential surface of the second large gear 222 has a plurality of tooth segments 2221 arranged evenly spaced around the circumference, and there is an idle section 2222 between adjacent tooth segments 2221, and the tooth segment 2221 is meshed with the second small gear 224.

[0063] The first eluent is dripped onto the highest point of the conduit block 112, and the third motor 22 drives the main body 12 and the conduit block 112 to rotate slowly through the engagement of the first small gear 221 and the first large gear 223 (due to the damping between the first rotating rod 113 and the main body 12, the rotational torque of the main body 12 will also be transmitted to the first rotating rod 113 and the covering block 111, causing the covering block 111 to rotate slowly), so that the eluent of the first elution needle 202 is transferred downward to the lowest point of the conduit block 112.

[0064] The ejection cylinder 31 ejects the eluent, and the eluent falls at the lowest point of the confluence block 112 to merge with the original eluent in the confluence block 112. Moreover, due to the kinetic energy of the ejection cylinder 31, the collected eluent will be spread and covered along the surface of the cover block 111. In this process, the tooth segment 2221 of the second large gear 222 is meshed with the second small gear 224. Due to the high gear ratio, the first rotating rod 113 and the cover block 111 will quickly rotate an angle, and the flattened eluent will be quickly brought to a higher position in time to reduce the loss of the flattened eluent flowing and dripping under the action of gravity.

[0065] And because the tooth segments 2221 are arranged at intervals, when the second pinion 224 cooperates with the idle stroke segment 2222, the first rotating rod 113 is only subjected to the torque from the main body 12. At this time, the covering block 111 rotates slowly, and when the tooth segment 2221 cooperates with the second pinion 224, the covering block 111 will rotate rapidly. Therefore, the covering block 111 will rotate rapidly intermittently to cooperate with the interval ejection of the ejection tube 31, that is, when the ejection tube 31 ejects the eluent, the covering block 111 will rotate rapidly to bring the flattened eluent to a higher position in time.

[0066] Embodiment 4, embodiment 4 is different from embodiment 2 in that, Fig. 9 , Fig.10 As shown, the main body 12 and the pointed cone portion 11 of the base rod are separately arranged, and a second rotating rod 115 is integrally formed at one end of the pointed cone portion 11 , and the second rotating rod 115 passes through a second through hole 123 opened at the axis of the main body 12 .

[0067] At the same time, the base rod is also provided with a plurality of strip-shaped substrates 13, the material of the substrates 13 being consistent with that of the base rod, specifically, the substrates 13 extend along the generatrix direction of the pointed cone portion 11, the substrates 13 are an odd number, preferably 5, and the substrates 13 are evenly distributed around the circumference of the pointed cone portion 11, and there is a gap between the inner surface of the substrate 13 and the outer surface of the pointed cone portion 11 (the inner surface of the substrate 13 refers to the surface of the substrate 13 facing the pointed cone portion 11, and the outer surface of the substrate 13 refers to the surface of the substrate 13 facing away from the pointed cone portion 11).

[0068] A clamping block 131 is integrally formed at one end of the substrate 13 , and a clamping slot 125 is formed on the outer peripheral surface of the main body 12 for the clamping block 131 to be inserted and fixed.

[0069] The surfaces of the substrate 13, the block 131, the conical portion 11, the second rotating rod 115 and the main body 12 are all covered with a functional material layer. The specific preparation method of the functional material layer covered by the substrate 13, the block 131, the conical portion 11, the second rotating rod 115 and the main body 12 is consistent with the functional material layer preparation method in the Chinese patent with application number CN202311116158.0.

[0070] First, prepare the functional material layers of the substrate 13, the block 131, the conical portion 11, the second rotating rod 115 and the main body 12 respectively, and then assemble them in sequence to ensure that the functional material layer on the end face of the conical portion 11 fits with the functional material layer on the end face of the main body 12, and the functional material layer on the surface of the block 131 fits with the functional material layer of the slot 125 to ensure the conduction of current.

[0071] like Fig.11 , Fig.12 As shown, the rotation drive assembly 2 includes a fourth motor 25 and a fifth motor 23, the main body 12 is fixed to the rotating ring 107, the fifth motor 23 is installed on the vertical rod 105, the output shaft of the fifth motor 23 is fixed with a second driving gear 231, the outer side of the rotating ring 107 is coaxially fixed with a second driven gear 232, the second driven gear 232 is meshed with the second driving gear 231, and the fifth motor 23 drives the main body 12 and the substrate 13 to rotate intermittently through gear matching, so that each substrate 13 intermittently moves to the ejection landing point of the ejection tube 31, that is, each substrate 13 intermittently moves to the position directly below the pointed cone portion 11.

[0072] The fourth motor 25 is installed on the vertical rod 105, and the output shaft of the fourth motor 25 is directly fixed to the second rotating rod 115. Specifically, the end face of the second rotating rod 115 is provided with a polygonal hole (not marked in the figure), and the output shaft of the fourth motor 25 is inserted into the hole, so that the torque of the fourth motor 25 can be transmitted to the second rotating rod 115 to drive the pointed cone part 11 to rotate slowly.

[0073] like Fig.12 As shown ( Fig.12The two solid arrows in the figure respectively indicate the slow rotation direction of the pointed cone 11 and the intermittent movement direction of the substrate 13, the dotted arrow located above indicates the dripping direction of the first elution needle 202, and the dotted arrow located below indicates the ejection direction of the ejection cylinder 31). When dripping the eluent, the eluent dripped by the first elution needle 202 will pass through the gap between the two substrates 13 and directly drip onto the pointed cone 11. The fourth motor 25 drives the pointed cone 11 to rotate slowly through the second rotating rod 115, so as to gradually transfer the eluent to the lowest point of the pointed cone 11, so that the subsequent eluent of the first elution needle 202 can be relatively The eluent is evenly dripped to various circumferential positions of the pointed cone 11, and more eluent located at the lowest point of the pointed cone 11 will drip downward to the inner surface of the substrate 13 facing the pointed cone 11, that is, the inner surface of the substrate 13 will receive the excess eluent. At the same time, the substrate 13 located directly below corresponds to the ejection landing point of the ejection tube 31, that is, the eluent of the ejection tube 31 will also cover the outer surface of the substrate 13, so that the surface of the pointed cone 11, the inner surface of the substrate 13, and the outer surface of the substrate 13 are all covered with eluent, which greatly increases the contact area of ​​the eluent. Finally, the substrate 13 and the pointed cone 11 are ionized to ionize the target object.

[0074] In this way, through the three-dimensional double-layer structure composed of the substrate 13 and the pointed cone portion 11, and in conjunction with the dripping of the first elution needle 202, the natural dripping due to gravity and the landing point control of the ejection tube 31, the surface of the pointed cone portion 11, the inner surface of the substrate 13, and the outer surface of the substrate 13 are all provided with eluent, which greatly increases the contact area of ​​the eluent and the dripping amount of the eluent, thereby greatly improving the effect of the ionization spray and ensuring the accuracy of detection.

[0075] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A perfluorinated compound detection device for extracting organic materials from food, comprising a mounting platform (10), an enrichment element (1), a high voltage power supply (201), a mass spectrometer (20), a first elution needle (202) and a first microinjection pump (203), wherein the enrichment element (1) is arranged horizontally, one end of the enrichment element (1) is set as a pointed cone (11), and the enrichment element (1) comprises a base rod and a functional material layer attached to the surface of the base rod, characterized in that: The invention also comprises a second elution needle (204), a second micro-injection pump (205), a conical tube (3), an ejection tube (31), an intermittent trigger assembly (5) and a rotation drive assembly (2), wherein the rotation drive assembly (2) is used to drive the enrichment element (1) to rotate around its own axis, the first elution needle (202) is located directly above the large end of the pointed cone (11), and the first micro-injection pump (203) is used to transport the eluent to the first elution needle (202); the conical tube (3) is located directly below the enrichment element (1), the conical tube (3) is made of rubber, and the conical tube (3) has a large port. and a small port, the large port of the conical tube (3) faces upward and is inclined toward the pointed cone portion (11), the axis of the conical tube (3) and the axis of the enrichment element (1) have an angle less than 90°, and the ejection tube (31) is fixed to the small port of the conical tube (3); the second micro-injection pump (205) is used to transport eluent to the second elution needle (204), and the second elution needle (204) is used to transport eluent into the ejection tube (31); the intermittent trigger component (5) is used to apply a force to the ejection tube (31) to eject the eluent in the ejection tube (31) to the pointed cone portion (11).

2. The perfluorinated compound detection device for food organic material extraction according to claim 1, characterized in that: The mounting platform (10) is provided with a bracket (32), the large end of the conical tube (3) is fixedly connected to the bracket (32), the intermittent trigger assembly (5) comprises a first motor, a cam (51), a spring (53) and a striking rod (52), the striking rod (52) is located below the ejection tube (31), the striking rod (52) is slidably connected to the bracket (32), the sliding direction of the striking rod (52) is the axial direction of the ejection tube (31), the first motor is used to drive the cam (51) to rotate, the spring (53) is used to force one end of the striking rod (52) to abut against the outer peripheral surface of the cam (51), and the cam (51) is used to drive the striking rod (52) to slide toward the ejection tube (31) and make one end of the striking rod (52) strike the outer bottom surface of the ejection tube (31).

3. The perfluorinated compound detection device for food organic material extraction according to claim 1, characterized in that: The mounting platform (10) is provided with a bracket (32), the large end of the conical tube (3) is fixedly connected to the bracket (32), the intermittent trigger assembly (5) comprises two second motors and two rotating shafts (55), the outer peripheral surface of the ejection tube (31) is fixed with two symmetrically arranged protrusions (311), the second motor is fixedly connected to the bracket (32), the two second motors are symmetrically arranged with the axis of the ejection tube (31) as the center, the rotating shaft (55) is fixed to the output shaft of the second motor, a plurality of circumferentially evenly arranged trigger rods (56) are fixed to the outer peripheral surface of the rotating shaft (55), the protrusion (311) is located on the circumferential movement path of the end of the trigger rod (56), and the movement path of the protrusion (311) driven by the trigger rod (56) is arranged to intersect with the movement path of the end of the trigger rod (56).

4. The device for detecting perfluorinated compounds extracted from food organic materials according to claim 3, characterized in that: The base rod comprises a main body (12) and the pointed cone portion (11); the pointed cone portion (11) is divided into a confluence block (112) and a covering block (111) along its own axial direction; the surfaces of the confluence block (112) and the covering block (111) are both covered with the functional material layer; the confluence block (112) is integrally formed and connected to the main body (12); the functional material layer on the end face of the covering block (111) is in contact with the functional material layer on the end face of the confluence block (112); the landing point of the first elution needle (202) is located at the confluence block ( 112), the landing point of the ejection tube (31) is located at the confluence block (112); the rotation drive assembly (2) comprises a third motor (22), a first large gear (223), a first small gear (221), a second large gear (222) and a second small gear (224); the mounting platform (10) is fixed with a vertical rod (105), the vertical rod (105) is fixed with a fixed ring (106), the outer side of the fixed ring (106) is rotatably connected with a rotating ring (107), and the main body (12) and the rotating ring (107) are connected to each other. The first large gear (223) is coaxially fixed to the outer side of the rotating ring (107); the cover block (111) is fixed with a first rotating rod (113); the first rotating rod (113) passes through a first through hole (121) provided at the axis of the main body (12); a rubber ring (122) is provided between the first rotating rod (113) and the inner wall of the first through hole (121); the second small gear (224) is coaxially fixed to the end of the first rotating rod (113); the first small gear (221) The first gear (221) and the second large gear (222) are both fixed to the output shaft of the third motor (22), the first small gear (221) is meshed with the first large gear (223), the outer peripheral surface of the second large gear (222) has a plurality of tooth segments (2221) arranged evenly spaced around the circumference, and there is an idle section (2222) between adjacent tooth segments (2221), and the tooth segments (2221) are meshed with the second small gear (224); when the ejection tube (31) ejects the eluent, the tooth segments (2221) are meshed with the second small gear (224).

5. The device for detecting perfluorinated compounds extracted from food organic materials according to claim 1, characterized in that: The base rod comprises a main body (12) and a pointed cone portion (11), the surfaces of the main body (12) and the pointed cone portion (11) are both covered with the functional material layer, and the functional material layer on the end face of the pointed cone portion (11) is in contact with the functional material layer on the end face of the main body (12); the mounting platform (10) is fixed with a vertical rod (105), the vertical rod (105) is fixed with a fixed ring (106), the outer side of the fixed ring (106) is rotatably connected with a rotating ring (107), the main body (12) and the rotating ring (107) are detachably connected, the pointed cone portion (11) is fixed with a second rotating rod (115), the second rotating rod (115) passes through a second through hole (123) opened at the axis of the main body (12); The main body (12) is fixed with an odd number of strip-shaped substrates (13), the substrates (13) extending along the generatrix direction of the pointed cone portion (11), a gap being provided between the inner surface of the substrate (13) and the outer surface of the pointed cone portion (11), the surface of the substrate (13) being covered with the functional material layer, wherein the substrate (13) located directly below corresponds to the ejection landing point of the ejection tube (31); the rotation drive assembly (2) comprises a fourth motor (25) and a fifth motor (23), wherein the fourth motor (25) is used to drive the second rotating rod (115) to rotate; and the fifth motor (23) is used to drive the main body (12) and the substrates (13) to rotate intermittently, so that each substrate (13) is intermittently moved to the ejection landing point of the ejection tube (31).

6. A method for detecting perfluorinated compounds extracted from food organic materials, characterized in that: The following steps are involved: The sample to be tested is brought into contact with the enrichment element (1) of the perfluorinated compound detection device for extracting perfluorinated compounds from organic materials in food as claimed in claim 1, and the enrichment element (1) extracts perfluorinated compounds from the sample to be tested; The first micro-injection pump (203) delivers eluent to the first elution needle (202), and the eluent of the first elution needle (202) is dripped onto the pointed cone portion (11). The rotation drive component (2) drives the enrichment element (1) to rotate, so that the eluent on the surface of the pointed cone portion (11) gradually moves to the lowest point of the pointed cone portion (11). The second micro-injection pump (205) delivers eluent to the second elution needle (204), and the eluent of the second elution needle (204) drips onto the ejection cylinder (31). Under the action of the intermittent trigger component (5), the eluent in the ejection cylinder (31) is ejected to the lowest point of the pointed cone portion (11). The two eluents converge and move toward the tip of the pointed cone portion (11). The eluent covers the pointed cone portion (11) to perform desorption treatment on the perfluorinated compound. The desorbed perfluorinated compound is ionized by a high voltage power supply (201) and enters the mass spectrometer (20) through the injection port (200) of the mass spectrometer (20) for detection.

7. The method for detecting perfluorinated compounds extracted from food organic materials according to claim 6, characterized in that: The detection mode of the mass spectrometer (20) is multiple reaction monitoring (MRM).

8. The method for detecting perfluorinated compounds extracted from food organic materials according to claim 6, characterized in that: The distance between the tip of the pointed cone (11) and the injection port (200) of the mass spectrometer (20) is 4-6 cm.

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