CN117367899A - Portable living plant VOCs releases sampling device - Google Patents
Portable living plant VOCs releases sampling device Download PDFInfo
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- CN117367899A CN117367899A CN202311679876.9A CN202311679876A CN117367899A CN 117367899 A CN117367899 A CN 117367899A CN 202311679876 A CN202311679876 A CN 202311679876A CN 117367899 A CN117367899 A CN 117367899A
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- 238000005070 sampling Methods 0.000 title claims abstract description 101
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 71
- 238000007789 sealing Methods 0.000 claims abstract description 81
- 238000009434 installation Methods 0.000 claims abstract description 5
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 241000196324 Embryophyta Species 0.000 claims description 65
- 239000004744 fabric Substances 0.000 claims description 16
- 239000012528 membrane Substances 0.000 claims description 16
- 238000001179 sorption measurement Methods 0.000 claims description 16
- 239000004809 Teflon Substances 0.000 claims description 14
- 229920006362 Teflon® Polymers 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 235000014676 Phragmites communis Nutrition 0.000 claims description 9
- 229920001971 elastomer Polymers 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 244000089486 Phragmites australis subsp australis Species 0.000 claims 1
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 244000273256 Phragmites communis Species 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 208000033962 Fontaine progeroid syndrome Diseases 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a portable living plant VOCs release sampling device, which belongs to the technical field of gas sampling equipment, and comprises a VOCs acquisition unit and a self-adaptive sealing box capable of accommodating living plants, wherein the self-adaptive sealing box is a foldable hollow cover body, and a telescopic hole capable of penetrating the living plants and sealing and wrapping the root parts of branches and trunks of the living plants is arranged at the bottom of the self-adaptive sealing box; the VOCs acquisition unit comprises a VOCs acquisition box and a gas circulation pipeline, and two gas pipe interfaces of the VOCs acquisition box are respectively connected with a gas pipe installation port on the self-adaptive sealing box through the gas circulation pipeline. The flexible holes at the bottom of the self-adaptive sealing box are used for facilitating living plants to enter, and the roots of the branches of the living plants can be wrapped to ensure the tightness of the self-adaptive sealing box, and the foldable self-adaptive sealing box is convenient to carry and is suitable for field operation; the VOCs collection box is communicated with the self-adaptive sealing box through the gas circulation pipeline, VOCs released by living plants in the self-adaptive sealing box can be collected and conveyed into the VOCs collection box, and accuracy of a sampling result is ensured.
Description
Technical Field
The invention belongs to the technical field of gas sampling equipment, and particularly relates to a portable living plant VOCs release sampling device.
Background
VOCs are gas-phase organic matters widely existing in the atmosphere, and can participate in the photochemical reaction process of the atmosphere to generate secondary pollutants so as to endanger the environment. The plant source VOCs are always high in the atmosphere, and the gas phase chemical activity of the plant source VOCs is always high, so that research on the plant source VOCs has important significance for atmospheric environment treatment. One important way to study the release of VOCs from plant sources is to study the release of VOCs from a single plant body and to study the influence of the plant on the release behavior of VOCs under different environmental conditions or when the environmental conditions change, and at this time, a dynamic headspace sampling method is required to sample plant samples and provide the environment required for the study for the plant body.
The existing device for releasing and sampling living plant VOCs often adopts a simpler dynamic headspace sampling method: and in the sampling process, a Teflon air bag is used for wrapping part of plant bodies, and a gas sampling pump arranged outside the air bag is used for sampling by matching with the gas in the circulating interior of the adsorption gas circulation pipeline. In the practical operation process, the method often has the problem that the air bag tightness is difficult to maintain, so that part of air enters the air bag along with the gap to interfere with the accuracy of the sampling result. The collection work for the release of living plant VOCs is often carried out in the field, and therefore, the portability of the sampling device is also particularly important.
Based on the problems, the invention provides a portable living plant VOCs release sampling device which can be used for researching the VOCs release characteristics of living plants in the atmosphere.
Disclosure of Invention
The invention aims to provide a portable living plant VOCs release sampling device, and aims to solve the technical problem that in the prior art, an air bag is used for matching with a sampling pump for sampling, and the sampling result is inaccurate due to poor air bag tightness.
In order to solve the technical problems, the invention adopts the following technical scheme:
the portable living plant VOCs release sampling device comprises a VOCs acquisition unit and a self-adaptive sealing box capable of accommodating living plants, wherein the self-adaptive sealing box is a foldable hollow cover body, and a telescopic hole capable of penetrating the living plants and sealing and wrapping the roots of the branches of the living plants is formed in the bottom of the self-adaptive sealing box; the VOCs acquisition unit comprises a VOCs acquisition box and a gas circulation pipeline, and two gas pipe interfaces of the VOCs acquisition box are respectively connected with a gas pipe installation port on the self-adaptive sealing box through the gas circulation pipeline.
Preferably, the self-adaptive sealing box comprises a top cover, a bottom plate and cylindrical membrane cloth, wherein four corners of the top cover and the bottom plate are connected through detachable brackets, the brackets are arranged outside the membrane cloth, the upper end of the membrane cloth is connected with the peripheral edges of the top cover, and the lower end of the membrane cloth is connected with the peripheral edges of the bottom plate; the top cover and the bottom plate are respectively provided with an air pipe mounting opening, the middle part of the bottom plate is provided with a self-sealing mechanism, and the middle part of the self-sealing mechanism is a circular telescopic hole.
Preferably, the self-sealing mechanism comprises a mounting ring, an elastic outer cover and a telescopic element, wherein the mounting ring is connected with the edge of a mounting hole in the middle of a bottom plate in a sealing manner through a fastening piece, the outer cover is wrapped outside the telescopic element, the middle of the outer cover is a telescopic hole through which living plants can penetrate, the telescopic element is arranged between the mounting ring and the telescopic hole, and the edges of the inner side and the outer side of the outer cover are connected with the telescopic hole and the mounting ring respectively.
Preferably, the telescopic element is a plurality of elliptic metal reeds, and the plurality of elliptic metal reeds are arranged between the telescopic hole and the mounting ring in a vertically staggered manner.
Preferably, the outer cover is rubber, an elastic guard ring is arranged on the inner side of the telescopic hole, and polyurethane sponge and external wrapping rubber are arranged in the elastic guard ring.
Preferably, the top cover and the bottom plate are transparent acrylic plates; the membrane cloth is a transparent film made of Teflon material.
Preferably, the top cover and the bottom plate are rectangular, and the four corners of the top cover and the bottom plate are provided with sockets for installing the bracket.
Preferably, the VOCs collecting box comprises a box body and a sampling pump, a gas purifier, a connector and a temperature and humidity sensor in the box body, wherein two parts of a gas circulation pipeline are respectively connected with two gas pipe interfaces of the box body, a detachable adsorption sampling pipe or communicating pipe can be installed on the connector, the sampling pump and the gas purifier are all arranged on the gas circulation pipeline, the gas circulation pipeline can be connected with one gas pipe interface on the box body through the adsorption sampling pipe or the communicating pipe, the gas purifier is arranged at the outlet end of the sampling pump, the outlet of the gas purifier is connected with the other gas pipe interface of the box body, and sealing rings are arranged at the gas pipe interfaces.
Preferably, the box body can be placed on the support, and a handle is arranged at the top of the box body; the gas circulation pipeline is a soft Teflon gas pipe, and the box body is made of metal.
Preferably, a three-way valve is arranged on an air outlet pipe of the sampling pump, two interfaces of the three-way valve are respectively connected with an air outlet of the sampling pump and a subsequent air pipeline, and the other interface is an emptying port capable of being directly discharged into the atmosphere; the gas purifier is provided with more than two purifying pipes which are connected in series; and the purifying pipe is filled with activated carbon or allochroic silica gel and is used for purifying gas filled into the self-adaptive sealing box.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the self-adaptive sealing box is convenient for living plants to enter by virtue of the telescopic holes at the bottom of the self-adaptive sealing box, can wrap the roots of the branches of the living plants to ensure the tightness of the self-adaptive sealing box, is more convenient to carry by adopting a foldable structure, and is suitable for field operation; and the VOCs released by living plants in the self-adaptive sealing box can be collected and conveyed into the VOCs collecting box through the gas circulation pipeline, so that the accuracy of a sampling result is ensured, and the influence of the plants on the VOCs releasing behavior of the plants under different environmental conditions or when the environmental conditions change is conveniently researched.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a portable living plant VOCs release sampling device according to an embodiment of the present invention;
FIG. 2 is a schematic view of the self-sealing mechanism of FIG. 1 mounted on a base plate (expanded state);
FIG. 3 is a schematic view of the self-sealing mechanism of FIG. 2 in a contracted state;
FIG. 4 is a view showing the outline of the case in the embodiment of the present invention;
in the figure: 100-self-adaptive sealing box, 101-telescopic hole, 102-air pipe mounting port, 103-top cover, 104-bottom plate, 105-membrane cloth, 106-bracket, 107-mounting ring, 108-outer cover, 109-telescopic element, 110-fastener, 111-elliptic metal reed and 112-self-sealing mechanism; 113-socket, 114-resilient retainer;
200-VOCs acquisition unit, 210-VOCs acquisition box, 211-box, 212-sampling pump, 213-gas purifier, 214-connector, 215-temperature and humidity sensor, 216-box door handle, 217-handle, 218-air pipe interface, 219-buckle; 220-gas circulation pipeline, 221-adsorption sampling pipe and 222-three-way valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a portable living plant VOCs release sampling device provided by the embodiment of the invention includes a VOCs collection unit 200 and a self-adaptive sealing box 100 capable of accommodating living plants, wherein the self-adaptive sealing box 100 is a foldable hollow cover body, and a telescopic hole 101 capable of penetrating the living plants and sealing and wrapping the roots of the branches of the living plants is arranged at the bottom of the self-adaptive sealing box 100; the VOCs collection unit 200 comprises a VOCs collection box 210 and a gas circulation pipeline 220, wherein two gas pipe interfaces 218 of the VOCs collection box 210 are respectively connected with a gas pipe installation port 102 on the self-adaptive seal box 100 through the gas circulation pipeline 220. The living plants can conveniently enter the self-adaptive sealing box by virtue of the telescopic holes, the tightness of the self-adaptive sealing box is ensured by tightly wrapping the root parts of the branches of the living plants, and the self-adaptive sealing box with a foldable structure is more convenient to carry and is suitable for field operation; the VOCs collection box is communicated with the self-adaptive sealing box through the gas circulation pipeline, VOCs released by living plants in the self-adaptive sealing box are collected and conveyed into the VOCs collection box through the gas circulation pipeline, and accuracy of a sampling result is ensured.
In one embodiment of the present invention, as shown in fig. 1-3, the adaptive seal box 100 includes a top cover 103, a bottom plate 104, and a tubular membrane cloth 105, wherein four corners of the top cover 103 and the bottom plate 104 are connected by detachable brackets 106, the brackets 106 are disposed outside the membrane cloth 105, an upper end of the membrane cloth 105 is connected to a peripheral edge of the top cover 103, and a lower end of the membrane cloth 105 is connected to a peripheral edge of the bottom plate 104; the top cover 103 and the bottom plate 104 are respectively provided with an air pipe mounting port 102, the middle part of the bottom plate 104 is provided with a self-sealing mechanism 112, and the middle part of the self-sealing mechanism 112 is provided with a circular telescopic hole 101. Wherein, the top cover 103 and the bottom plate 104 are transparent acrylic plates, and the bottom plate is provided with a self-adaptive sealing box for placing living plants and providing a sealing environment; the membrane cloth 105 is a transparent film made of teflon, so that a transparent sealed box can be assembled. In a specific design, the top cover 103 and the bottom plate 104 are rectangular, and the four corners of the top cover 103 and the bottom plate 104 are respectively provided with a socket 113 for installing the bracket 106.
When the self-adaptive sealing box is used, two ends of the support are inserted into the sockets at four corners of the top cover and the bottom plate, and the support is arranged between the top cover and the bottom plate, so that the stability of the self-adaptive sealing box structure is ensured. After the installation, can fix the bottom plate four corners position subaerial through fastener such as ground nail, demolish the support after using, compress tightly teflon material film between top cap and bottom plate, conveniently carry.
As a preferred structure, as shown in fig. 2 and 3, the self-sealing mechanism 112 includes a mounting ring 107, an elastic outer cover 108 and a telescopic member 109, the mounting ring 107 is connected with the edge of the mounting hole in the middle of the bottom plate 104 in a sealing manner through a sealing gasket and a fastening piece 110, the outer cover 108 is wrapped on the outer part of the telescopic member 109, the middle of the outer cover 108 is a telescopic hole 101 through which living plants can pass, the telescopic member 109 is arranged between the mounting ring 107 and the telescopic hole 101, and the inner and outer side edges of the outer cover 108 are respectively connected with the telescopic hole 101 and the mounting ring 107. The outer cover 108 is rubber, a ring of elastic retainer 114 is arranged at the inner side of the telescopic hole 101, and polyurethane sponge and rubber are wrapped outside the elastic retainer 114. When the device is used, the telescopic hole can be enlarged to facilitate the placement of living plants, then the telescopic element is released, the sponge and rubber of the inner ring after rebound compress the plant branches to realize the sealing of the sealing box, and then the subsequent sampling work can be carried out.
In a specific design, the telescopic element 109 is a plurality of elliptical metal reeds 111, and the plurality of elliptical metal reeds 111 are disposed between the telescopic hole 101 and the mounting ring 107 in a vertically staggered manner. When the expansion hole expands, the short axis of the metal reed becomes longer, and the long axis becomes shorter; on the contrary, after the plant is taken out, the plant is contracted under the self-elasticity action of the metal reed, the short shaft is shortened, the long shaft is lengthened, and the shrinkage of the telescopic hole is realized.
In one embodiment of the present invention, as shown in fig. 1 and 4, the VOCs collection box 210 includes a box body 211, a sampling pump 212, a gas purifier 213, a connector 214 and a temperature and humidity sensor 215 inside the box body 211, two parts of the gas circulation pipeline 220 are respectively connected with two gas pipe interfaces 218 of the box body 211, a detachable adsorption sampling pipe 221 or a communication pipe can be installed on the connector 214, the sampling pump 212 and the gas purifier 213 are both arranged on the gas circulation pipeline 220, the gas circulation pipeline 220 can be connected with one gas pipe interface 218 on the box body 211 through the adsorption sampling pipe 221 or the communication pipe, the gas purifier 213 is arranged at an outlet end of the sampling pump 212, an outlet of the gas purifier 213 is connected with the other gas pipe interface 218 of the box body 211, and sealing rings are all arranged at the gas pipe interfaces 218 to ensure tightness of the interfaces. In view of the fact that temperature and humidity are one of factors affecting the emission of the plant VOCs, the temperature and humidity sensor is used for recording the ambient temperature in the sampling process and the change of the temperature in the sampling box body.
In operation, the box 211 is placed on a support (not shown), and a handle 217 is arranged at the top of the box 211, so that the box is convenient to carry; the gas circulation pipe 220 is a soft teflon gas pipe, and the case 211 is made of metal. As shown in fig. 4, the box 211 is designed into a split structure, edges of two adjacent side plates are fixedly connected through a buckle 219, one side of the box is provided with an openable box door, one side of the box door is provided with a handle 216, and the box is convenient to open for operation.
Further optimizing the above technical solution, as shown in fig. 1, a three-way valve 222 is disposed on an air outlet pipe of the sampling pump 212, two interfaces of the three-way valve 222 are respectively connected with an air outlet of the sampling pump 212 and a subsequent air pipeline, another interface is an evacuation port capable of directly discharging into the atmosphere, and the three interfaces of the three-way valve 222 are controlled to control the flow direction of air, so as to realize air extraction or inflation of the self-adaptive seal box; the gas purifier 213 is composed of two or more purifying pipes, and the two or more purifying pipes are connected in series; and the purifying pipe is filled with activated carbon or allochroic silica gel and is used for purifying gas filled into the self-adaptive sealing box. Different numbers or functions of purge tubes may be installed as desired to achieve a particular need. And active carbon or allochroic silica gel is filled in different purifying pipes, so that moisture and impurities in gas can be removed in the process of inflation, and VOCs released by the sampling pump can be removed.
In use, the internal structure of the VOCs collection box 210 is in turn: a communicating pipe or an adsorption sampling pipe, a temperature and humidity sensor, a gas sampling pump, a three-way valve and a gas purifier. After being discharged from the gas outlet of the sealing box, the gas sequentially passes through a communicating pipe or an adsorption sampling pipe, a temperature and humidity sensor, a gas sampling pump, a three-way valve and a gas purifier and finally enters the sealing box.
When sampling is carried out, the air pipe mounting port of the sealing box is connected with the air pipe interface of the sampling box through two soft Teflon air pipes, the telescopic hole at the bottom of the sealing box is opened, the plant body is sleeved into the sealing box, and the plant limb is tightly pressed through the metal reed in the telescopic hole to realize the sealing of the sealing box. The sealed box is communicated with the sampling pump through the gas circulation pipeline, the three-way valve of the sampling pump is rotated to enable the emptying port of the sampling pump to be opened, meanwhile, the air inlet of the gas purifier 213 is closed, then the sampling pump is started to evacuate the gas in the sealed box and discharge the gas into the atmosphere, then the three-way valve is rotated to close the emptying port, meanwhile, the air inlet of the gas purifier 213 is opened, and the sampling pump starts to charge the purified air into the sealed box. And after the process is finished, installing an adsorption sampling tube, and circulating the gas sample in the VOCs collection box body, recording the sampling flow, and recording the sampling time and the temperature and humidity information in the sampling process.
Wherein, the connector 214 both sides are equipped with the interface and can insert the pipeline with the connector, can install detachable communicating pipe or absorption sampling tube between two connectors, and communicating pipe adopts the teflon pipe. And when sampling is performed, the communicating pipe is detached to be connected with the adsorption sampling tube. When air is required to be introduced into the self-adaptive sealed box, the communicating pipe is dismantled to directly extract the air and introduce the air into the box. The connector adopts a Diffusion locking cap, and the English name is Diffusion-locking caps, and the connector is purchased externally according to the requirement. The sampling method of the invention is as follows:
before sampling, an adaptive sealing box is assembled, and a soft Teflon air pipe between the self-adaptive sealing box and a box body is installed to serve as an air circulation pipeline; and opening the telescopic holes on the bottom plate of the self-adaptive sealing box, putting the plant to be collected into the telescopic holes, wrapping all the leaves of the plant, loosening the telescopic holes, and tightly pressing the branches for sealing. And then, adjusting a three-way valve at the VOCs collection box to open an evacuation port of the VOCs collection box, starting a sampling pump to pump gas in the sealed box, and closing the sampling pump. And removing the communicating pipe at the connector, adjusting the three-way valve to enable gas to be introduced into the sealed box, starting the sampling pump to pump outside air, purifying the outside air through the purifying pipe, and then introducing the outside air into the self-adaptive sealed box until the self-adaptive sealed box is filled with purified air. And (3) installing a support of the sealing box, installing an adsorption sampling tube on the connector, installing a flowmeter at the outlet end of the adsorption sampling tube, and starting a sampling pump to circularly sample while recording the sampling flow and the sampling time. After the sampling is finished, the plant body is moved out of the sealing box, the total leaf area of all the leaves is measured (the leaf area can be obtained by means of a leaf area measuring instrument), the VOCs release rate of the sample plant body is estimated according to the recorded sampling flow and sampling time, and the calculation process belongs to the prior art and is not repeated here. The adsorption sampling tube is purchased externally, and activated carbon capable of adsorbing VOCs is filled inside the adsorption sampling tube.
The mass of the collected VOCs can be determined by means of the thermal desorption instrument and the gas chromatograph GCMS, and the VOCs emission type of the sample can be determined by means of the thermal desorption instrument and the gas chromatograph GCMS.
After all sampling work is completed, the plant body is taken out, a soft Teflon air pipe connected with the air pipe interface of the sealing box bracket and the box body is removed, and after the acrylic plates on the upper side and the lower side of the light pressure sealing box discharge internal gas, the compressed sealing box is fixed on the side edge of the sampling box, so that the sealing box can be taken off site.
In conclusion, the invention has the advantages of simple and compact structure, quick operation and convenient carrying, and the plant can conveniently enter and be sealed through the telescopic hole on the bottom plate of the sealing box, and the plant can also conveniently exit the sealing box; the Teflon film is wrapped outside the bracket, so that the Teflon film can adapt to internal pressure change in the sampling process, and can compress the sealing box after the sampling is finished, so that the portability of the device is improved; the VOCs collection box can realize accurate sampling of VOCs released by plants, and accuracy of sampling results is ensured. The invention is especially suitable for the characteristic that the release and collection of the VOCs of plants are frequently carried out in the field.
In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed above.
Claims (10)
1. Portable living plant VOCs releases sampling device, its characterized in that: the self-adaptive sealed box is a foldable hollow cover body, and a telescopic hole capable of penetrating through the living plant and sealing the root of the branch of the living plant is formed in the bottom of the self-adaptive sealed box; the VOCs acquisition unit comprises a VOCs acquisition box and a gas circulation pipeline, and two gas pipe interfaces of the VOCs acquisition box are respectively connected with a gas pipe installation port on the self-adaptive sealing box through the gas circulation pipeline.
2. The portable living plant VOCs release sampling device according to claim 1, characterized in that: the self-adaptive sealing box comprises a top cover, a bottom plate and cylindrical membrane cloth, wherein four corners of the top cover and the bottom plate are connected through detachable brackets, the brackets are arranged outside the membrane cloth, the upper end of the membrane cloth is connected with the peripheral edges of the top cover, and the lower end of the membrane cloth is connected with the peripheral edges of the bottom plate; the top cover and the bottom plate are respectively provided with an air pipe mounting opening, the middle part of the bottom plate is provided with a self-sealing mechanism, and the middle part of the self-sealing mechanism is a circular telescopic hole.
3. The portable living plant VOCs release sampling device according to claim 2, characterized in that: the self-sealing mechanism comprises a mounting ring, an elastic outer cover and a telescopic element, wherein the mounting ring is connected with the edge of a mounting hole in the middle of a bottom plate in a sealing manner through a fastening piece, the outer cover is wrapped outside the telescopic element, the middle of the outer cover is a telescopic hole through which living plants can penetrate, the telescopic element is arranged between the mounting ring and the telescopic hole, and the edges of the inner side and the outer side of the outer cover are connected with the telescopic hole and the mounting ring respectively.
4. The portable living plant VOCs release sampling device according to claim 3, characterized in that: the telescopic element is a plurality of elliptic metal reeds which are arranged between the telescopic hole and the mounting ring in an up-and-down staggered way.
5. The portable living plant VOCs release sampling device according to claim 3, characterized in that: the outer cover is made of rubber, an elastic guard ring is arranged on the inner side of the telescopic hole, and polyurethane sponge and external wrapping rubber are arranged in the elastic guard ring.
6. The portable living plant VOCs release sampling device according to claim 2, characterized in that: the top cover and the bottom plate are transparent acrylic plates; the membrane cloth is a transparent film made of Teflon material.
7. The portable living plant VOCs release sampling device according to claim 2, characterized in that: the top cover and the bottom plate are rectangular, and the four corners of the top cover and the bottom plate are respectively provided with a socket for installing the bracket.
8. The portable living plant VOCs release sampling device according to any one of claims 1-7, wherein: the VOCs collecting box comprises a box body and a sampling pump, a gas purifier, a connector and a temperature and humidity sensor in the box body, wherein two parts of a gas circulation pipeline are respectively connected with two gas pipe interfaces of the box body, a detachable adsorption sampling pipe or communicating pipe can be installed on the connector, the sampling pump and the gas purifier are all arranged on the gas circulation pipeline, the gas circulation pipeline can be connected with one gas pipe interface on the box body through the adsorption sampling pipe or the communicating pipe, the gas purifier is arranged at the outlet end of the sampling pump, the outlet of the gas purifier is connected with the other gas pipe interface of the box body, and sealing rings are arranged at the gas pipe interfaces.
9. The portable living plant VOCs release sampling device according to claim 8, wherein: the box body can be placed on the support, and a handle is arranged at the top of the box body; the gas circulation pipeline is a soft Teflon gas pipe, and the box body is made of metal.
10. The portable living plant VOCs release sampling device according to claim 8, wherein: a three-way valve is arranged on an air outlet pipe of the sampling pump, two interfaces of the three-way valve are respectively connected with an air outlet of the sampling pump and a subsequent air pipeline, and the other interface is an emptying port capable of being directly discharged into the atmosphere; the gas purifier is provided with more than two purifying pipes which are connected in series; and the purifying pipe is filled with activated carbon or allochroic silica gel and is used for purifying gas filled into the self-adaptive sealing box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311679876.9A CN117367899A (en) | 2023-12-08 | 2023-12-08 | Portable living plant VOCs releases sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311679876.9A CN117367899A (en) | 2023-12-08 | 2023-12-08 | Portable living plant VOCs releases sampling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117367899A true CN117367899A (en) | 2024-01-09 |
Family
ID=89396998
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