A headspace injection bottle for photolysis reaction research and use method

Abstract

The present invention relates to a headspace sampling bottle for photolysis reaction research and a method of use, the headspace sampling bottle comprises a headspace bottle and an elastic sheet metal bracket capable of entering and exiting the headspace bottle, the headspace bottle comprises a headspace bottle cap and a headspace bottle body, the elastic sheet metal bracket comprises a metal sheet and a metal bracket foot, the metal sheet is used to lift and fix the sample, the metal sheet is connected to the metal bracket foot on both sides, the metal bracket foot can be opened outward spontaneously, and the metal bracket foot can be closed inward under the action of external force; after the elastic sheet metal bracket is placed in the headspace bottle, the metal bracket feet on both sides thereof are spontaneously opened outward, leaving a space for the sampling needle to penetrate in the upper part of the headspace bottle. Compared with the prior art, the headspace sampling bottle provided by the present invention has a simple structure, is easy to operate, and is low in cost, and can realize the integrated operation of photolysis reaction and gas detection.

Description

Technical Field

[0001] The invention relates to a sample injection bottle, in particular to a head space sample injection bottle for photolysis reaction research and a use method thereof. Background Art

[0002] The widespread use of plastic products has greatly facilitated human life, but it has also brought serious white pollution. Under the general trend of green environmental protection in today's society, photodegradable plastics have received widespread attention. Photolysis is one of the important ways for chemical substances to transform and disappear in the environment. In the safety evaluation of pesticides, drugs, environmental impact factors, etc., the study of the photolysis behavior of substances is an important task. At present, the research on photolysis behavior mainly focuses on the qualitative and quantitative analysis and determination of the substances after photolysis. If the gases released during the photolysis process are to be collected and measured, special gas collection and detection equipment is required, which is expensive and complicated to operate.

[0003] Headspace gas chromatography is a commonly used method for detecting volatile organic compounds. During the detection process, the volatile substances in the headspace injection bottle are heated and volatilized to form gas in the space at the top of the sample bottle and then diffuse, and finally the top gas above the volatile sample in the headspace bottle enters the gas phase detection.

[0004] Without using dedicated gas sampling and detection equipment, the gas produced after photolysis can be tested by headspace gas chromatography, but if only conventional headspace injection bottles are used, it will be difficult to collect and transfer the gas in the early stage. The following three inventions improve the headspace injection bottle to achieve the functions of completing the derivatization reaction in the headspace bottle, and reusing the bottle cap and the headspace bottle. However, none of the three inventions are suitable for photolysis reactions, and there is no headspace injection bottle dedicated to photolysis reaction research.

[0005] Chinese patent CN 101144800 B discloses a method based on needle tip derivatization in the headspace of a sample and its application, which is characterized by comprising the following steps: (1) using a micro syringe to absorb a derivatization reagent, preparing a headspace bottle containing a sample, and inserting a needle tip into its headspace; (2) forming a droplet of the derivatization reagent and hanging it on the needle tip of the syringe, and exposing it to the headspace of the sample; (3) after a period of derivatization, sucking back the droplet of the derivatization reagent to complete the derivatization process; (4) taking out the syringe and directly analyzing the instrument as needed. This method can be used for the derivatization of acidic components and aldehydes and ketones in the headspace of tobacco samples or cigarette smoke. Its advantages are: simple operation, high derivatization efficiency, low cost, only a trace amount of derivatization reagent is needed to achieve the derivatization purpose that meets the analysis requirements, and there is no memory effect and discrimination effect of the analyte. At the same time, the liquid phase microextraction technology is combined with the derivatization method, and the sensitivity is improved through the enrichment effect of the liquid phase microextraction, and the amount of extraction solvent is reduced, thereby shortening the preparation time. However, the invention is applicable to a limited number of derivatization reactions and is not applicable to photolysis reactions. In addition, since a syringe is required to add the derivatization reagent to the headspace bottle, the headspace bottle cannot be completely sealed.

[0006] Chinese patent CN 111348319 B discloses a sample injection bottle closure assembly for chemical analysis instruments, including a ball segment body, a ball support bottle plug and a bottle body, wherein the ball support bottle plug is installed at the upper opening of the bottle body, and the ball support bottle plug is processed with a sampling circular hole that passes through from top to bottom to connect to the internal cavity of the bottle body, and the ball segment body is movably placed on the ball support bottle plug and is used to block the sampling circular hole. This invention can solve the problem of reduced sealing, accuracy and reproducibility caused by multiple injections of volatile samples. The sample injection bottle can be reused repeatedly in the future without the need to purchase a new sample injection bottle cap, and cleaning and disassembly are more convenient. This invention mainly achieves the purpose of reusing the bottle cap by modifying the structure of the headspace bottle cap, and does not involve photolysis reaction.

[0007] Chinese patent CN 107796898 A discloses a headspace bottle with a detachable filtering device, which includes a headspace bottle body and a filtering device. The filtering device includes a plurality of rotating rods, a plurality of rotating handles and a filter screen. The plurality of rotating rods and the plurality of rotating handles are arranged one by one. One end of the plurality of rotating rods are rotatably connected together, and the other end of the rotating rod is connected to the rotating handle. The rotating handle is used to drive the rotating rod to rotate. A filter screen is arranged between the rotating rods. When the rotating rod rotates to drive the filter screen to fully unfold, the periphery of the filter screen fits the inner wall of the headspace bottle body. The headspace bottle with a detachable filtering device provided by the invention has a simple structure, is easy to use, and has a wide range of applications. The invention mainly adds a filtering device to the headspace bottle so that the sample can be directly sampled and tested after filtering in the headspace bottle, and does not involve a photolysis reaction. Summary of the invention

[0008] The invention aims to provide a headspace sampling bottle for photolysis reaction research and a use method thereof.

[0009] The headspace sampling bottle provided by the present invention has a simple structure, is easy to operate, and is low in cost, and can realize the integrated operation of photolysis reaction and gas detection. After the photolysis reaction of the sample is completed in the headspace sampling bottle, the sampling bottle is used to directly inject and analyze, without the need to separately collect the gas generated during the photolysis process, thereby avoiding the loss and cross contamination that may occur during the gas collection and transfer process.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] The invention provides a headspace sampling bottle for photolysis reaction research, comprising a headspace bottle and an elastic metal sheet bracket capable of entering and exiting the headspace bottle, wherein the headspace bottle comprises a headspace bottle cover and a headspace bottle body, and the elastic metal sheet bracket comprises a metal sheet and a metal bracket foot, wherein the metal sheet is used for lifting and fixing a sample, and the metal bracket feet are respectively connected to the metal bracket feet at both sides of the metal sheet, and the metal bracket feet can spontaneously open outwards, and the metal bracket feet can be closed inwards under the action of an external force; after the elastic metal sheet bracket is placed in the headspace bottle, the metal bracket feet at both sides thereof spontaneously open outwards, and a space for a sampling needle to penetrate is reserved in the upper part of the headspace bottle.

[0012] In one embodiment of the present invention, the headspace bottle cap comprises a sealing gasket, a screw cap with holes and a polytetrafluoroethylene liner, and the sealing gasket and the polytetrafluoroethylene liner can be pierced by an injection needle. The headspace bottle cap is an ordinary headspace injection bottle cap, which can be purchased directly.

[0013] In one embodiment of the present invention, the head space bottle body is used to hold samples, and the head space bottle body is composed of a hard glass bottle body and a quartz end window, the quartz end window is connected to the bottom end of the hard glass bottle body, and when the head space bottle is inverted, the quartz end window can transmit ultraviolet rays to allow the sample to undergo a photolysis reaction.

[0014] In one embodiment of the present invention, the quartz end window is connected to the bottom end of the hard glass bottle body by welding, forming a weld between the quartz end window and the hard glass bottle body.

[0015] In one embodiment of the present invention, the hard glass bottle body is made of ordinary glass, and the quartz end window is made of quartz.

[0016] In one embodiment of the present invention, the connection between the metal sheet and the metal bracket foot is elastic.

[0017] In one embodiment of the present invention, it also includes a bracket hook for enabling the elastic metal sheet bracket to enter and exit the head space bottle. The bottom end of the bracket hook is a centrally symmetrical two-way hook. The two-way hook is perpendicular to the bracket hook handle and can hook the metal bracket feet on both sides of the metal sheet bracket. The length of the two-way hook is smaller than the diameter of the head space bottle mouth and can enter the head space bottle. The bracket hook can release or retract the elastic metal sheet bracket by vertically lowering or lifting.

[0018] In one embodiment of the present invention, the end of the metal bracket foot has an outward bending structure, which enables the bracket hook to hook the elastic metal sheet bracket upward. After the elastic metal sheet bracket is placed in the head space bottle, the metal bracket feet on both sides thereof spontaneously open outward, and the outward bending structure at the end of the metal bracket foot is fixed at the bottle mouth, so that the sample can be lifted and fixed under the quartz end window when the head space bottle is inverted.

[0019] The method for using the headspace injection bottle for photolysis reaction research provided by the present invention is: after the sample is loaded, the integrated operation of photolysis reaction and gas detection can be realized. In the photolysis reaction stage, the headspace injection bottle is inverted to perform light irradiation reaction; in the gas detection stage, the headspace injection bottle is placed upright and a gas chromatograph is used for sample injection analysis.

[0020] In one embodiment of the present invention, the specific method of using the headspace injection bottle for photolysis reaction research is as follows:

[0021] 1. Sample loading: Place an appropriate amount of sample into the bottom of the headspace injection bottle. The sample can be selected as needed, such as photodegradable plastic fragments. Use the two-way hook at the bottom of the bracket hook to hook the metal bracket feet on both sides of the elastic metal sheet bracket, and vertically lower it into the headspace bottle. After the metal sheet contacts the sample, continue to release the bracket hook downward, so that the metal bracket feet naturally open outward, and the elastic metal sheet bracket is in a released state. Take out the bracket hook and tighten the headspace bottle cap.

[0022] 2. Photolysis: Place the headspace bottle upside down in a photolysis test box equipped with an ultraviolet lamp. The photolysis test box includes an ultraviolet lamp tube and a reflector above the ultraviolet lamp tube. A bottle rack is set below the ultraviolet lamp tube for placing the headspace bottle. The metal bracket feet on both sides of the metal sheet bracket in the headspace bottle spontaneously open outwards, and the outward bending structure at the end of the metal bracket feet is fixed at the bottle mouth, lifting and fixing the sample between the metal sheet and the quartz end window. The sample undergoes a photolysis reaction under ultraviolet irradiation, and the gases released during the photolysis process are all gathered in the headspace bottle.

[0023] 3. Injection: After the photolysis reaction is completed, take out the headspace bottle and place it upright in the gas chromatography injection area. During injection, the injection needle pierces the sealing pad and the polytetrafluoroethylene liner, enters the sampling needle insertion space reserved in the upper part of the headspace bottle, absorbs the gas sample, and completes the injection.

[0024] 4. Recovery: After the gas chromatograph sampling is completed, remove the headspace bottle, open the headspace bottle cap, extend the bracket hook into the headspace bottle, hook the metal bracket foot of the elastic metal sheet bracket, lift the bracket hook upward, and retract the elastic metal sheet bracket. The residual sample after photolysis in the headspace bottle can also be taken out for other detection and analysis.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] 1. The present invention has a simple structure, is easy to operate, and is low in cost, and does not require the use of a dedicated gas sampling device. Furthermore, the present invention uses quartz glass only at the bottom of the headspace injection bottle, and other parts of the bottle body use cheaper ordinary hard glass, which further reduces the cost of sample bottle manufacturing.

[0027] 2. The present invention can realize the integrated operation of photolysis reaction and gas detection. After the photolysis reaction of the sample is completed in the headspace sampling bottle, the sampling bottle is used for direct sampling and analysis, without the need to separately collect the gas generated during the photolysis process, thus avoiding the loss and cross contamination that may occur during the gas collection and transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a headspace injection bottle used for photolysis reaction research in Example 1 of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the bracket hook in Example 1 of the present invention;

[0030] Figure 3 This is a schematic structural diagram of a bidirectional hook in a bracket hook extractor in Example 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of using a bracket hook to release an elastic metal sheet bracket into a headspace sampling bottle for photolysis reaction research in Example 1 of the present invention;

[0032] Figure 5 This is a schematic diagram of using a bracket hook to retract and remove an elastic metal sheet bracket from a headspace sampling bottle used for photolysis reaction research in Example 1 of the present invention;

[0033] Figure 6 This is a schematic diagram of a usage scenario of a headspace sampling bottle for photolysis reaction research in Example 1 of the present invention.

[0034] The numbers in the figure show:

[0035] 1-1-sealing pad, 1-2-perforated screw cap, 1-3-polytetrafluoroethylene lining, 2-sampling needle piercing space, 3-hard glass bottle, 4-elastic metal sheet bracket, 4-1-metal sheet, 4-2-metal bracket foot, 5-sample, 6-fusion joint, 7-quartz end window, 8-bracket hook, 9-bidirectional curved hook, 10-bottle rack, 11-reflector, 12-ultraviolet lamp, 13-photolysis test chamber, 14-headspace bottle. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] refer to Figure 1 In this embodiment, a headspace sampling bottle for photolysis reaction research is provided, including a headspace bottle and an elastic metal sheet bracket 4 that can enter and exit the headspace bottle, the headspace bottle includes a headspace bottle cover and a headspace bottle body, the elastic metal sheet bracket 4 includes a metal sheet 4-1 and a metal support foot 4-2, the metal sheet 4-1 is used to hold and fix the sample, the metal sheet 4-1 is connected to the metal support foot 4-2 on both sides, the metal support foot 4-2 can spontaneously open outward, and the metal support foot 4-2 can be closed inward under the action of external force; after the elastic metal sheet bracket 4 is placed in the headspace bottle, the metal support feet 4-2 on both sides thereof spontaneously open outward, leaving a sampling needle insertion space 2 in the upper part of the headspace bottle.

[0039] Continue to refer Figure 1 In this embodiment, the headspace bottle cap includes a sealing gasket 1-1, a screw cap with holes 1-2 and a polytetrafluoroethylene liner 1-3, and the sealing gasket 1-1 and the polytetrafluoroethylene liner 1-3 can be pierced by an injection needle. The headspace bottle cap is an ordinary headspace injection bottle cap, which can be purchased directly.

[0040] Continue to refer Figure 1 In this embodiment, the headspace bottle body is used to hold samples. The headspace bottle body is composed of a hard glass bottle body 3 and a quartz end window 7. The quartz end window 7 is connected to the bottom end of the hard glass bottle body 3. When the headspace bottle is inverted, the quartz end window 7 can transmit ultraviolet rays to allow the sample to undergo a photolysis reaction.

[0041] Continue to refer Figure 1 In this embodiment, the quartz end window 7 is connected to the bottom end of the hard glass bottle body 3 by welding, and a weld 6 is formed between the quartz end window 7 and the hard glass bottle body 3.

[0042] In this embodiment, the hard glass bottle body 3 is made of ordinary glass, and the quartz end window 7 is made of quartz.

[0043] In this embodiment, the connection between the metal sheet 4 - 1 and the metal bracket foot 4 - 2 is elastic.

[0044] refer to Figure 2 and Figure 3 In this embodiment, a bracket hook 8 is also included for realizing the elastic metal sheet bracket 4 entering and exiting the head space bottle. The bottom end of the bracket hook 8 is a centrally symmetrical bidirectional hook 9. The bidirectional hook 9 is perpendicular to the handle of the bracket hook 8 and can hook the metal bracket feet 4-2 on both sides of the metal sheet bracket 4. The length of the bidirectional hook 9 is smaller than the diameter of the head space bottle mouth and can enter the head space bottle. The bracket hook 8 can release or retract the elastic metal sheet bracket 4 by vertically lowering or lifting.

[0045] Continue to refer Figure 1 In this embodiment, the end of the metal support foot 4-2 has an outward bending structure, which enables the bracket hook 8 to hook the elastic metal sheet bracket 4 upward. After the elastic metal sheet bracket 4 is placed in the head space bottle, the metal support feet 4-2 on both sides thereof spontaneously open outward, and the outward bending structure at the end of the metal support foot 4-2 is fixed at the bottle mouth, so that the sample can be lifted and fixed under the quartz end window 7 when the head space bottle is inverted.

[0046] The method of using the headspace injection bottle for photolysis reaction research provided in this embodiment is: after the sample is loaded, the integrated operation of photolysis reaction and gas detection can be realized. In the photolysis reaction stage, the headspace injection bottle is inverted to perform light irradiation reaction; in the gas detection stage, the headspace injection bottle is placed upright and a gas chromatograph is used for sample injection analysis.

[0047] The specific usage of the headspace vial for photolysis reaction research is as follows:

[0048] 1. Sample loading: Load an appropriate amount of sample 5 into the bottom of the headspace sampling bottle. The sample can be selected according to the needs, such as photodegradable plastic fragments. Use the two-way hook 9 at the bottom of the bracket hook 8 to hook the metal bracket feet 4-2 on both sides of the elastic metal sheet bracket 4, and vertically lower it into the headspace bottle. After the metal sheet 4-1 contacts the sample, continue to release the bracket hook 8 downward, so that the metal bracket feet 4-2 naturally open outward, so that the elastic metal sheet bracket 4 is in a released state, such as Figure 4 Take out the bracket hook 8 and tighten the top space bottle cap.

[0049] 2. Photolysis: Reference Figure 6, the headspace bottle is inverted in a photolysis test box equipped with an ultraviolet lamp, the photolysis test box includes an ultraviolet lamp tube 12 above and a reflector 11 located above the ultraviolet lamp tube 12, and a bottle rack 10 is arranged below the ultraviolet lamp tube 12, and the bottle rack 10 is used to place the headspace bottle 14. The metal support feet 4-2 on both sides of the metal sheet bracket 4 in the headspace bottle spontaneously open outwards, and the outward bending structure at the end of the metal support foot 4-2 is fixed at the bottle mouth, and the sample is lifted and fixed between the metal sheet 4-1 and the quartz end window 7. The sample 5 undergoes a photolysis reaction under ultraviolet irradiation, and the gases released during the photolysis process are all gathered in the headspace bottle.

[0050] 3. Injection: After the photolysis reaction is completed, take out the headspace bottle and place it upright in the gas chromatography injection area. When injecting, the injection needle pierces the sealing gasket 1-1 and the polytetrafluoroethylene liner 1-3, enters the sampling needle in the upper part of the headspace bottle and penetrates the space 2 to absorb the gas sample and complete the injection.

[0051] 4. Recovery: After the gas chromatograph sampling is completed, remove the headspace bottle, open the headspace bottle cover, extend the bracket hook 8 into the headspace bottle, hook the metal bracket foot 4-2 of the elastic metal sheet bracket 4, lift the bracket hook 8 upwards, and retract and take out the elastic metal sheet bracket 4. Figure 5 The residual sample after photolysis in the headspace bottle can also be taken out for other detection and analysis.

[0052] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A headspace sampling bottle for photolysis reaction research, characterized in that: It comprises a headspace bottle and an elastic sheet metal bracket (4) capable of entering and exiting the headspace bottle, the headspace bottle comprising a headspace bottle cap and a headspace bottle body, the elastic sheet metal bracket (4) comprising a metal sheet (4-1) and metal bracket feet (4-2), the metal sheet (4-1) being used to hold and fix a sample, the metal sheet (4-1) being connected to the metal bracket feet (4-2) on both sides, the metal bracket feet (4-2) being capable of spontaneously opening outwards, and the metal bracket feet (4-2) being capable of closing inwards under the action of an external force; after the elastic sheet metal bracket (4) is placed in the headspace bottle, the metal bracket feet (4-2) on both sides thereof are spontaneously opened outwards, leaving a space (2) for a sampling needle to penetrate in the upper part of the headspace bottle; The headspace bottle body is composed of a hard glass bottle body (3) and a quartz end window (7), the quartz end window (7) is connected to the bottom end of the hard glass bottle body (3), and when the headspace bottle is inverted, the quartz end window (7) can transmit ultraviolet rays to allow the sample to undergo a photolysis reaction; After the elastic metal sheet bracket (4) is placed in the headspace bottle, the metal bracket feet (4-2) on both sides thereof spontaneously open outwards, and the outwardly bent structures at the ends of the metal bracket feet (4-2) are fixed at the bottle mouth, so that when the headspace bottle is inverted, the sample can be lifted and fixed below the quartz end window (7).

2. A headspace sampling bottle for photolysis reaction research according to claim 1, characterized in that: The headspace bottle cap comprises a sealing gasket (1-1), a screw cap with a hole (1-2) and a polytetrafluoroethylene liner (1-3); the sealing gasket (1-1) and the polytetrafluoroethylene liner (1-3) can be pierced by an injection needle.

3. A headspace sampling bottle for photolysis reaction research according to claim 1, characterized in that: The quartz end window (7) is connected to the bottom end of the hard glass bottle body (3) by welding, forming a welded joint (6) between the quartz end window (7) and the hard glass bottle body (3).

4. A headspace sampling bottle for photolysis reaction research according to claim 1, characterized in that: The hard glass bottle body (3) is made of ordinary glass, and the quartz end window (7) is made of quartz.

5. The headspace sampling bottle for photolysis reaction research according to claim 1, characterized in that: The connection between the metal sheet (4-1) and the metal bracket foot (4-2) is elastic.

6. A headspace sampling bottle for photolysis reaction research according to claim 1, characterized in that: It also includes a bracket hook (8) for enabling the elastic metal sheet bracket (4) to enter and exit the headspace bottle. The bottom end of the bracket hook (8) is a centrally symmetrical bidirectional hook (9). The bidirectional hook (9) is perpendicular to the handle of the bracket hook (8) and can hook the metal bracket feet (4-2) on both sides of the metal sheet bracket (4). The length of the bidirectional hook (9) is smaller than the diameter of the headspace bottle mouth and can enter the headspace bottle. The bracket hook (8) can release or retract the elastic metal sheet bracket (4) by vertically lowering or lifting.

7. A headspace sampling bottle for photolysis reaction research according to claim 6, characterized in that: The end of the metal bracket foot (4-2) has an outwardly bent structure, which enables the bracket hooking device (8) to hook the elastic metal sheet bracket (4) upwards.

8. The method for using the head space sampling bottle for photolysis reaction research according to any one of claims 1 to 7, characterized in that: After the headspace injection bottle is loaded with samples, it is used to realize the integrated operation of photolysis reaction and gas detection; in the photolysis reaction stage, the headspace injection bottle is inverted to carry out light reaction; in the gas detection stage, the headspace injection bottle is placed upright and a gas chromatograph is used for sample injection and analysis.

9. The method for using the headspace sampling bottle for photolysis reaction research according to claim 8, characterized in that: The following steps are involved:

1. Sample loading: Load the sample (5) into the bottom of the headspace sampling bottle, use the two-way hook (9) at the bottom of the bracket hook (8) to hook the metal bracket feet (4-2) on both sides of the elastic metal sheet bracket (4), and vertically lower the headspace bottle. After the metal sheet (4-1) contacts the sample, continue to release the bracket hook (8) downward, so that the metal bracket feet (4-2) naturally open outward, so that the elastic metal sheet bracket (4) is in a released state, take out the bracket hook (8), and tighten the headspace bottle cap; 2. Photolysis: The headspace bottle is placed upside down in a photolysis test box equipped with an ultraviolet lamp. The metal support legs (4-2) on both sides of the metal sheet bracket (4) in the headspace bottle are spontaneously opened outwards. The outward bending structure at the end of the metal support legs (4-2) is fixed at the bottle mouth, and the sample is lifted and fixed between the metal sheet (4-1) and the quartz end window (7). The sample (5) undergoes a photolysis reaction under ultraviolet light, and the gas released during the photolysis process is gathered in the headspace bottle; 3. Sampling: After the photolysis reaction is completed, take out the headspace bottle and place it upright in the gas chromatography injection area. During the injection, the injection needle pierces the sealing pad (1-1) and the polytetrafluoroethylene liner (1-3) and enters the sampling needle insertion space (2) reserved in the upper part of the headspace bottle to absorb the gas sample and complete the injection; 4. Recovery: After the gas chromatograph sampling is completed, the headspace bottle is removed, the headspace bottle cap is opened, the bracket hook (8) is inserted into the headspace bottle, the metal bracket foot (4-2) of the elastic metal sheet bracket (4) is hooked, and the bracket hook (8) is lifted upwards to retract and take out the elastic metal sheet bracket (4). The residual sample after photolysis in the headspace bottle can also be taken out for other detection and analysis.

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