CN112986463A - Two-section type gas sampling pipe and preparation method and application thereof - Google Patents
Two-section type gas sampling pipe and preparation method and application thereof Download PDFInfo
- Publication number
- CN112986463A CN112986463A CN202110174100.6A CN202110174100A CN112986463A CN 112986463 A CN112986463 A CN 112986463A CN 202110174100 A CN202110174100 A CN 202110174100A CN 112986463 A CN112986463 A CN 112986463A
- Authority
- CN
- China
- Prior art keywords
- gas sampling
- sampling tube
- adsorbent
- gas
- tenax
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
Abstract
The invention provides a two-section type gas sampling tube and a preparation method and application thereof. The invention selects Tenax TA and Carboxen 1000 carbon molecular sieve as adsorbent to prepare two-section gas sampling tube, the preparation method comprises the following steps: adding a copper net into the empty pipe of the adsorption pipe, then adding glass wool, adding a TenaxTA adsorbent, adding the glass wool for separation, then adding a Carboxen 1000 carbon molecular sieve, and finally adding the glass wool and the copper net in sequence to fix the adsorbent in the pipe to obtain the composite material. Wherein, the Tenax TA has better adsorption performance on VOCs with more than six carbon atoms; the Carboxen 1000 carbon molecular sieve has good adsorptivity to VOCs with less than six carbon atoms, and the combination of the two can better collect various volatile organic compounds released by plastics and improve the accuracy of qualitative and quantitative analysis of the VOCs.
Description
Technical Field
The invention relates to the technical field of analysis and test methods, in particular to a two-section type gas sampling tube and a preparation method and application thereof.
Background
Plastics are almost ubiquitous in our lives, and are used by people in large quantities due to the characteristics of lightness, easiness in manufacturing and forming and capability of meeting various application requirements. China is a large country for manufacturing and using plastics, and the pollution problem caused by using a large amount of plastics gradually draws wide attention of people. A large amount of waste plastics can bring huge pressure to the ecological environment, the plastics can pollute the environment, and the plastic wastes exposed in the environment can be subjected to photodegradation under the action of sunlight to continuously release harmful Volatile Organic Compounds (VOCs). These VOCs are important precursors for atmospheric pollution and also are the main precursors for secondary organic aerosols (e.g., benzene, toluene, ethylbenzene, etc.). The release of these VOCs not only poses a threat to the ecosystem, but also has an adverse impact on human health. The condition of VOCs released in the plastic illumination process is accurately monitored, so that not only is a theoretical reference basis provided for the production and use of the plastic to be evaluated, but also an actual reference value is provided for the management and control of plastic emission.
The gas sampling tube is one of the common sampling methods for VOCs, the method adopts the solid adsorbent filled in the gas sampling tube to enrich VOCs, can effectively reduce the loss of target compounds, improve the sensitivity and reduce the detection limit, can store large-capacity gas samples, and has small volume and convenient use. The selection of the adsorbent material is the key to the sampling effect of the VOCs. The adsorbent commonly used comprises a porous substance (Tenax TA) based on 2, 6-diphenyl-p-phenylene ether polymer, and the adsorbent has better adsorption performance on volatile organic compounds with more than six carbon atoms (C6). For example: chinese patent publication No. CN107703223A discloses a method for detecting Total Volatile Organic Compounds (TVOC) in indoor air, and particularly discloses that adsorption of Tenax-TA tubes to TVOCs in indoor air can be improved by microwave activation treatment, so as to improve accuracy of TVOC concentration measurement. However, the adsorption effect of the Tenax-TA tube on volatile organic compounds with less than six carbon atoms still needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a two-section gas sampling tube.
The second objective of the present invention is to provide a method for preparing the two-stage gas sampling tube.
The third purpose of the present invention is to provide the application of the above two-section gas sampling tube.
The above object of the present invention is achieved by the following technical solutions:
the two-section type gas sampling tube comprises a gas sampling tube body, wherein a Tenax TA adsorbent and a Carboxen 1000 carbon molecular sieve are filled in the gas sampling tube.
The invention selects Tenax TA and Carboxen 1000 carbon molecular sieve as adsorbent to prepare two-section gas sampling tube. The Tenax TA adsorbent has good adsorption performance on VOCs above C6, the Carboxen 1000 carbon molecular sieve has good adsorption performance on VOCs below C6, and the combination of the two adsorbents not only can better collect various volatile organic compounds released by plastics, but also improves the accuracy of qualitative and quantitative analysis of the VOCs.
Preferably, a copper mesh and glass wool are further arranged inside the gas sampling pipe; the glass wool is respectively arranged between the Tenax TA adsorbent and the Carboxen 1000 carbon molecular sieve and at two ends of the Tenax TA adsorbent and the Carboxen 1000 carbon molecular sieve; the copper mesh is arranged outside the glass wool at the two ends.
Preferably, the mesh number of the Carboxen 1000 carbon molecular sieve is 60-80 meshes.
Preferably, the mass ratio of the Tenax TA adsorbent to the Carboxen 1000 carbon molecular sieve is 1.6-2: 1.
Preferably, the Tenax TA adsorbent is arranged at the air inlet end of the gas sampling pipe, and the Carboxen 1000 carbon molecular sieve is arranged at the end, far away from the air inlet, of the Tenax TA adsorbent.
The preparation method of the two-section gas sampling tube comprises the following steps:
adding a copper net with a proper size into the empty pipe of the adsorption pipe, then adding glass wool, adding a Tenax TA adsorbent, adding the glass wool for separation, then adding a Carboxen 1000 carbon molecular sieve, and finally adding the glass wool and the copper net in sequence to fix the adsorbent in the pipe to obtain the composite adsorbent.
Preferably, the adsorption tube is a glass tube.
The two-section gas sampling tube is applied to detection of plastic volatile organic compounds.
The application of the two-section gas sampling pipe in the detection of the plastic volatile organic compounds comprises the following specific steps:
s1, aging of a two-section gas sampling pipe: aging the gas sampling tube in high-temperature nitrogen flow for 4-6 h, removing impurities in the adsorbent, sealing two ends of the gas sampling tube after aging is completed, wrapping the gas sampling tube with dust-free paper and tinfoil paper in sequence, and refrigerating and storing for later use;
s2, enriching volatile organic compounds: taking out the aged two-section gas sampling tube obtained in the step S1, unsealing, connecting an air pump and a collector containing volatile organic compound gas, extracting the gas of the collector at a flow rate of 0.2-0.4L/min, allowing the gas to enter the two-section gas sampling tube, allowing the gas to pass through a Tenax TA adsorbent and a Carboxen 1000 carbon molecular sieve in sequence, and enriching volatile organic compounds in the gas sampling tube to obtain a gas sampling tube enriched with the volatile organic compounds; (ii) a
S3, determination of volatile organic compounds: and (5) performing thermal desorption on the gas sampling pipe enriched with the volatile organic compounds in the step S2, and determining the content of the volatile organic compounds through a gas chromatography-mass spectrometer.
Preferably, the specific steps of step S3 are: placing the gas sampling tube in a thermal desorption instrument, raising the temperature to 270-280 ℃ for thermal desorption, condensing the desorbed substances at 0-2 ℃, heating to 200-220 ℃, and allowing the desorbed substances to enter a chromatographic column of a gas chromatography-mass spectrometer along with carrier gas for separation; temperature-raising program of the chromatographic column: maintaining the initial temperature at 40-45 ℃ for 2-4 min; gradually raising the temperature to 85-95 ℃ at a heating rate of 7-9 ℃/min and keeping the temperature for 3-5 min; and then gradually increasing the temperature to 200-220 ℃ at the speed of 5-7 ℃/min, and keeping the temperature for 4-6 min.
More preferably, the carrier gas is 99.99% high purity helium.
More preferably, the flow rate of the carrier gas is 30-32 cm/s.
Compared with the prior art, the invention has the following beneficial effects:
the invention selects Tenax TA and Carboxen 1000 carbon molecular sieve as adsorbent to prepare two-section gas sampling tube. Wherein, the Tenax TA adsorbent has better adsorption performance on VOCs above C6; the Carboxen 1000 carbon molecular sieve has good adsorptivity to VOCs below C6, and the combination of the two can better collect various volatile organic compounds released by plastics and improve the accuracy of the qualitative and quantitative determination of the VOCs.
Drawings
FIG. 1 is a schematic view of a two-stage gas sampling tube; drawing notes: 1-an air inlet; 2-a first copper mesh; 3-first glass wool; 4-Tenax TA adsorbent; 5-second glass wool; 6-Carboxen 1000 carbon molecular sieve; 7-third glass wool; 8-a second copper mesh; 9-adsorption tube.
FIG. 2 is a diagram of a gas chromatograph-mass spectrometer for measuring the content of VOCs in a two-stage gas sampling tube.
FIG. 3 is a gas chromatograph-mass spectrometer used for measuring the content of VOCs in a Tenax TA gas sampling tube.
Detailed Description
The invention is further described with reference to the drawings and the following detailed description, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
The 54 VOCs used in the following examples were purchased from shanghai' an spectral laboratory science and technology ltd; the double-valve sampling bag has the capacity of 10L and is purchased from Tiancheng environmental protection science and technology Limited company of Beijing Haochen; tenax TA adsorbent is purchased from Agilent, USA; carbon1000 Carbon molecular sieve adsorbent was purchased from sigma-aldrich; the sorbent tube blank was purchased from GERSTEL corporation. The copper mesh was purchased from Guangzhou hardware screen house; glass wool was purchased from agilent corporation, usa; dust-free paper is purchased from the U.S. Kimberly corporation. An atmospheric sampling pump (HB-1, Mingtian environmental protection instruments Co., Ltd., China), a thermal desorption apparatus (hereinafter abbreviated as TDU, GERSTEL Co., Ltd.), a gas chromatography-mass spectrometer (7890B-5977B, Agilent, USA).
EXAMPLE 1 two-stage gas sampling tube and preparation thereof
As shown in fig. 1, a two-stage gas sampling tube comprises an adsorption tube, wherein a groove is formed at the gas inlet end of the adsorption tube, and the gas outlet end is straight; a first copper net, first glass wool, a Tenax TA adsorbent filler, second glass wool, a Carboxen 1000 carbon molecular sieve filler, a third glass wool and a second copper net are sequentially arranged or filled in the adsorption pipe along the air inlet direction; the copper mesh is an interlayer of filler and is used for fixing the adsorbent filler in the adsorption tube, and the glass wool is used for preventing the adsorbent from falling out of the tube. The preparation process of the two-section gas sampling tube comprises the following steps: filling the materials into the adsorption tube from the gas outlet end, firstly adding a copper net with a proper size at the bottom of the filling tube to fix the adsorbent in the gas sampling tube, then adding a proper amount of glass wool to prevent the adsorbent from falling out of the tube, then accurately adding 0.25g of Tenax TA adsorbent, then adding a proper amount of glass wool to separate two layers of the adsorbent, then accurately adding 0.15g of Carboxen 1000 carbon molecular sieve, and lightly shaking the gas sampling tube to ensure that the filler is firmly fixed in the tube. Finally, adding a proper amount of glass wool and a piece of copper mesh to fix the adsorbent in the tube, and completing the preparation of the two-section gas sampling tube.
EXAMPLE 2 preparation of two-stage gas sampling tube
Only the mass of the Tenax TA adsorbent in example 1 was modified to 0.3g, the mass of the Carboxen 1000 carbon molecular sieve was modified to 0.15g, and the other conditions were unchanged, and a two-stage gas sampling tube was prepared.
Comparative example 1 preparation of Tenax TA gas sampling tube
Only "0.25 g of Tenax TA adsorbent" and "0.15 g of Carboxen 1000 carbon molecular sieve" in example 1 were replaced with "0.4 g of Tenax TA adsorbent", and the remaining conditions were not changed, and gas sampling tubes were prepared.
Test example 1 gas sampling tube for collecting plastic volatile organic compounds
Firstly, 10 mu L of mixed standard (20mg/L) containing 54 VOCs is added into a Teflon double-valve sampling bag with the volume of 10L, 10L of nitrogen is introduced to dilute the gas concentration in the sampling bag to 20ng/L, and the sampling bag containing volatile organic compound gas is prepared.
(1) Aging of the gas sampling pipe: aging the gas sampling pipes prepared in the example 1 and the comparative example 1 for 4 hours in a high-temperature nitrogen flow respectively to remove impurities in the adsorbent; after aging, sealing two ends of the gas sampling pipe tightly, wrapping the gas sampling pipe with dust-free paper and tinfoil paper in sequence, and refrigerating and storing for later use;
(2) enrichment of volatile organic compounds: respectively connecting the two gas sampling pipes in the step (1) with a gas pump and a sampling bag containing volatile organic compound gas, extracting the gas of the sampling bag at the flow rate of 0.3L/min, and enriching the volatile organic compound in the gas sampling pipes;
(3) determination of volatile organic compounds: and (3) respectively putting the two gas sampling pipes enriched with the volatile organic compounds in the step (2) into a thermal desorption instrument (GERSTEL, MPS XT, Germany) for thermal desorption, and measuring the content of the volatile organic compounds by a gas chromatography-mass spectrometer (Agilent, 7890B-5977B, USA). The method comprises the following specific steps: placing two gas sampling tubes for collecting VOCs standard samples in a thermal desorption instrument (TDU) at low temperature, continuously heating the TDU to 280 ℃ for thermal desorption, feeding desorbed substances into a cooling sample introduction system (CIS), condensing at 0-2 ℃, heating the CIS to 200 ℃, and feeding the desorbed substances into a GC chromatographic column along with high-purity helium with the flow rate of 31cm/s and the purity of 99.99% for separation. The GC chromatographic column adopts a DB-624MS UI capillary column for chromatographic separation, the length multiplied by the width is 60m multiplied by 0.25mm, and the diameter is 1.4 mu m; temperature-raising program of chromatographic column: initial temperature at 45 deg.C for 3 min; then gradually increasing the temperature to 90 ℃ at the heating rate of 8 ℃/min and keeping the temperature for 4 min; then gradually increasing to 200 ℃ at the speed of 6 ℃/min, and keeping the temperature for 5 min. The total run time was 40 min. Finally, obtaining VOCs components in the standard gas sample and corresponding peak area results, and continuously measuring three parallels in each group. And comparing the measurement results (chromatographic peak shape, reproducibility and recovery rate) of the two sampled gas sampling pipes to evaluate the adsorption performance of the two-section gas sampling pipe on wide-area plastic release VOCs.
And (4) analyzing results: the results of measuring the content of VOCs in the two-section gas sampling tube and the Tenax TA gas sampling tube by the gas chromatograph-mass spectrometer are respectively shown in FIGS. 2 and 3; wherein, the No. 1-10 peaks marked in the figure are respectively the absorption peaks of bromochloromethane, cis-1, 3-dichloropropene, 1, 2-trichloroethane, tetrachloroethylene, o-chlorotoluene, p-chlorotoluene, tert-butyl benzene, 1,2, 4-trichlorobenzene and 1,2, 3-trichlorobenzene. Comparing fig. 2 and fig. 3, it can be seen that the enrichment capacity of the two-stage gas sampling tube for target VOCs is significantly higher than that of the Tenax TA gas sampling tube (p < 0.01). On the whole, the stronger the volatility of the VOCs is, the more remarkable the difference is; and the recovery rate of the two-section gas sampling tube to the 1, 2-dichloropropane, bromochloromethane, cis-1, 3-dichloropropene and other substances with stronger volatility is more than 1.45 times of that of the Tenax TA gas sampling tube. Wherein the recovery rates of the two-section gas sampling tube to bromochloromethane, cis-1, 3-dichloropropene, 1, 2-trichloroethane, tetrachloroethylene and other components (C1-C3) with stronger volatility are 104.51%, 99.77%, 104.41%, 102.45% and 101.22%; while the recovery rate of the Tenax TA gas sampling tube is only 64.28%, 68.11%, 74.18%, 73.81% and 68.32%. In addition, the recovery rates of the two-section gas sampling tube to components with weaker volatility (more than C6), such as o-chlorotoluene, p-chlorotoluene, tert-butyl benzene, 1,2, 4-trichlorobenzene, 1,2, 3-trichlorobenzene and the like, are 109.09%, 102.65%, 112.82%, 98.51% and 112.53%, while the recovery rates of the Tenax TA gas sampling tube to the five substances are only 83.26%, 76.64%, 83.88%, 87.20% and 101.00%. The two-section gas sampling tube effectively solves the problem that the Tenax TA gas sampling tube has poor enrichment effect on high-volatility VOCs (C1-C6), has good adsorption effect on various VOCs (C1-C26) released by plastics, can better enrich high-boiling-point components, and can adsorb low-boiling-point high-volatility components.
Claims (10)
1. The two-section type gas sampling tube is characterized by comprising a gas sampling tube body, wherein a Tenax TA adsorbent and a Carboxen 1000 carbon molecular sieve are filled in the gas sampling tube in a subsection manner.
2. The two-stage gas sampling tube according to claim 1, wherein a copper mesh and glass wool are further arranged inside the gas sampling tube; the glass wool is respectively arranged between the Tenax TA adsorbent and the Carboxen 1000 carbon molecular sieve and at two ends of the Tenax TA adsorbent and the Carboxen 1000 carbon molecular sieve; the copper mesh is arranged outside the glass wool at the two ends.
3. The two-stage gas sampling tube according to claim 1, wherein the mesh number of the Carboxen 1000 carbon molecular sieve is 60-80 mesh.
4. The two-stage gas sampling tube according to claim 1, wherein the mass ratio of the Tenax TA adsorbent to the Carboxen 1000 carbon molecular sieve is 1.6-2: 1.
5. The two-stage gas sampling tube of claim 1, wherein the Tenax TA adsorbent is disposed at an inlet end of the gas sampling tube, and the Carboxen 1000 carbon molecular sieve is disposed at an end of the Tenax TA adsorbent away from the inlet end.
6. The method for preparing a two-stage gas sampling tube according to claim 2, comprising the steps of:
adding a copper net into the empty pipe of the adsorption pipe, then adding glass wool, adding a Tenax TA adsorbent, adding the glass wool for separation, then adding a Carboxen 1000 carbon molecular sieve, and finally adding the glass wool and the copper net in sequence to fix the adsorbent in the pipe to obtain the composite adsorbent.
7. The application of the two-section gas sampling tube of any one of claims 1 to 5 in the detection of plastic volatile organic compounds.
8. The application of claim 7, comprising the following specific steps:
s1, aging of a two-section gas sampling pipe: aging the two-section gas sampling tube for 4-6 h in high-temperature nitrogen flow, removing impurities in the adsorbent, sealing two ends of the sampling tube after aging, wrapping the sampling tube with dust-free paper and tinfoil paper in sequence, and refrigerating for later use;
s2, enriching volatile organic compounds: taking out the aged two-section gas sampling tube obtained in the step S1, unsealing, connecting an air pump and a collector containing volatile organic compound gas, extracting the gas of the collector at a flow rate of 0.2-0.4L/min, allowing the gas to enter the two-section gas sampling tube, allowing the gas to pass through a Tenax TA adsorbent and a Carboxen 1000 carbon molecular sieve in sequence, and enriching volatile organic compounds in the gas sampling tube to obtain a gas sampling tube enriched with the volatile organic compounds;
s3, determination of volatile organic compounds: and (5) performing thermal desorption on the gas sampling pipe enriched with the volatile organic compounds in the step S2, and determining the content of the volatile organic compounds through a gas chromatography-mass spectrometer.
9. The application of claim 8, wherein the specific steps of step S3 are as follows: placing the gas sampling tube in a thermal desorption instrument, raising the temperature to 270-280 ℃ for thermal desorption, condensing the desorbed substances at 0-2 ℃, heating to 200-220 ℃, and allowing the desorbed substances to enter a chromatographic column of a gas chromatography-mass spectrometer along with carrier gas for separation; temperature-raising program of the chromatographic column: maintaining the initial temperature at 40-45 ℃ for 2-4 min; gradually raising the temperature to 85-95 ℃ at a heating rate of 7-9 ℃/min and keeping the temperature for 3-5 min; and then gradually increasing the temperature to 200-220 ℃ at the speed of 5-7 ℃/min, and keeping the temperature for 4-6 min.
10. The use according to claim 9, wherein the carrier gas has a flow rate of 30 to 32 cm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174100.6A CN112986463A (en) | 2021-02-07 | 2021-02-07 | Two-section type gas sampling pipe and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174100.6A CN112986463A (en) | 2021-02-07 | 2021-02-07 | Two-section type gas sampling pipe and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112986463A true CN112986463A (en) | 2021-06-18 |
Family
ID=76349243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110174100.6A Pending CN112986463A (en) | 2021-02-07 | 2021-02-07 | Two-section type gas sampling pipe and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112986463A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113521957A (en) * | 2021-07-19 | 2021-10-22 | 华电智控（北京）技术有限公司 | Filling method and filling device for VOCs-enriched adsorption tube |
| CN114199639A (en) * | 2021-11-03 | 2022-03-18 | 广东省职业病防治院(广东省职业卫生检测中心) | Air sampling detection method for nitrobenzene compounds |
| CN114200035A (en) * | 2021-11-03 | 2022-03-18 | 广东省职业病防治院(广东省职业卫生检测中心) | Air sampling detection method for tricresyl phosphate |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5435169A (en) * | 1993-06-14 | 1995-07-25 | New Jersey Institute Of Technology | Continuous monitoring of organic pollutants |
| CN101294936A (en) * | 2007-04-25 | 2008-10-29 | 中国科学院沈阳应用生态研究所 | Plant source volatile organic matter test method |
| US20100242579A1 (en) * | 2009-03-24 | 2010-09-30 | Andrew Tipler | Sorbent devices with longitudinal diffusion paths and methods of using them |
| CN201965043U (en) * | 2010-10-27 | 2011-09-07 | 中国科学院大连化学物理研究所 | Sampling tube and sampling enriching and thermal desorbing device for atmospheric trace volatile organic compounds |
| WO2015091576A1 (en) * | 2013-12-17 | 2015-06-25 | Forest Laboratories Deutschland Gmbh | Method for breath gas analysis in the case of infectious diseases |
| US20190391126A1 (en) * | 2016-12-16 | 2019-12-26 | Tokuyama Corporation | Method of Analyzing Resins Adhering to Crushed Polysilicon |
| GB202018014D0 (en) * | 2020-11-16 | 2020-12-30 | Curtis Mervyn Stanley | Rapid non-invasive testing for disease using clothing |
-
2021
- 2021-02-07 CN CN202110174100.6A patent/CN112986463A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5435169A (en) * | 1993-06-14 | 1995-07-25 | New Jersey Institute Of Technology | Continuous monitoring of organic pollutants |
| CN101294936A (en) * | 2007-04-25 | 2008-10-29 | 中国科学院沈阳应用生态研究所 | Plant source volatile organic matter test method |
| US20100242579A1 (en) * | 2009-03-24 | 2010-09-30 | Andrew Tipler | Sorbent devices with longitudinal diffusion paths and methods of using them |
| CN201965043U (en) * | 2010-10-27 | 2011-09-07 | 中国科学院大连化学物理研究所 | Sampling tube and sampling enriching and thermal desorbing device for atmospheric trace volatile organic compounds |
| WO2015091576A1 (en) * | 2013-12-17 | 2015-06-25 | Forest Laboratories Deutschland Gmbh | Method for breath gas analysis in the case of infectious diseases |
| US20190391126A1 (en) * | 2016-12-16 | 2019-12-26 | Tokuyama Corporation | Method of Analyzing Resins Adhering to Crushed Polysilicon |
| GB202018014D0 (en) * | 2020-11-16 | 2020-12-30 | Curtis Mervyn Stanley | Rapid non-invasive testing for disease using clothing |
Non-Patent Citations (2)
| Title |
|---|
| CARLOS RODRÍ GUEZ-NAVAS 等: "Use of thermal desorption–gas chromatography–mass spectrometry (TD–GC– MS) on identification of odorant emission focus by volatile organic compounds characterisation", CHEMOSPHERE, vol. 89, pages 1426 - 1436 * |
| KYOKO YAMASHITA 等: "Compositions of Volatile Organic Compounds Emitted from Melted Virgin and Waste Plastic Pellets", JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION, vol. 59, pages 273 - 278 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113521957A (en) * | 2021-07-19 | 2021-10-22 | 华电智控（北京）技术有限公司 | Filling method and filling device for VOCs-enriched adsorption tube |
| CN113521957B (en) * | 2021-07-19 | 2023-02-28 | 华电智控（北京）技术有限公司 | Filling method and filling device for VOCs-enriched adsorption tube |
| CN114199639A (en) * | 2021-11-03 | 2022-03-18 | 广东省职业病防治院(广东省职业卫生检测中心) | Air sampling detection method for nitrobenzene compounds |
| CN114200035A (en) * | 2021-11-03 | 2022-03-18 | 广东省职业病防治院(广东省职业卫生检测中心) | Air sampling detection method for tricresyl phosphate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112986463A (en) | Two-section type gas sampling pipe and preparation method and application thereof | |
| AU2016256798B2 (en) | Sorbent devices and methods of using them | |
| CN202281715U (en) | Adsorption tube taking molecular sieve as filler | |
| CN101294936B (en) | Plant source volatile organic matter test method | |
| Dettmer et al. | Ambient air analysis of volatile organic compounds using adsorptive enrichment | |
| CN110568118A (en) | c2-C3Method for determining concentration of hydrocarbon substance | |
| CN106290595B (en) | On-line monitoring method for volatile organic compounds in atmosphere | |
| CN110702495B (en) | Method for enriching and analyzing benzene series in air based on MOFs (metal-organic frameworks) material | |
| CN102928499A (en) | Rapid analysis device and method for ambient air volatile organic compounds | |
| Liu et al. | Application of thermal desorption methods for airborne polycyclic aromatic hydrocarbon measurement: A critical review | |
| CN109799302B (en) | Near-online detection method for medium-volatility organic compounds | |
| CN111337608A (en) | Method for measuring volatile organic compounds in solid pollution source waste gas | |
| CN113834884A (en) | Ozone layer consumables on-line monitoring system | |
| CN112731992A (en) | Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap | |
| CN111650299A (en) | High-sensitivity determination method for trace volatile organic compounds in ambient air | |
| CN108593816B (en) | Method for improving purging efficiency of volatile components in tobacco | |
| JP2002250722A (en) | Method and equipment for analyzing extremely low concentration hydrogen sulfide | |
| Leinster et al. | Detection and measurement of volatile hydrocarbons at ambient concentrations in the atmosphere | |
| Liu et al. | Evaluation of single-walled carbon nanotubes as novel adsorbent for volatile organic compounds | |
| CN210180986U (en) | Near-on-line detection device for medium volatile organic compounds | |
| Liu et al. | Multi-layer cartridges filled with multi-walled carbon nanotubes for the determination of volatile organic compounds in indoor air | |
| CN213581877U (en) | Full-automatic low temperature series valve who sweeps entrapment appearance keeps apart water trap | |
| JP6290564B2 (en) | Method for measuring volatile chlorinated hydrocarbons in ambient air | |
| RU2789634C1 (en) | Method for determining furan and methylfuran in atmospheric air by capillary gas chromatography with a mass selective detector using the low-temperature concentration method | |
| CN203350264U (en) | Novel sample tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |