CN113865945B - Unpowered hood type semi-volatile organic compound passive sampling device and application method thereof - Google Patents
Unpowered hood type semi-volatile organic compound passive sampling device and application method thereof Download PDFInfo
- Publication number
- CN113865945B CN113865945B CN202111104086.9A CN202111104086A CN113865945B CN 113865945 B CN113865945 B CN 113865945B CN 202111104086 A CN202111104086 A CN 202111104086A CN 113865945 B CN113865945 B CN 113865945B
- Authority
- CN
- China
- Prior art keywords
- sampling
- sampling box
- volatile organic
- hood
- connecting cylinder
- 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.)
- Active
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 153
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 32
- 238000001179 sorption measurement Methods 0.000 claims abstract description 31
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 11
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 16
- 239000011496 polyurethane foam Substances 0.000 claims description 16
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000000944 Soxhlet extraction Methods 0.000 claims description 2
- 239000013557 residual solvent Substances 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- 210000001503 joint Anatomy 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 32
- 239000002689 soil Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000178 monomer Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000257303 Hymenoptera Species 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 231100000693 bioaccumulation Toxicity 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001793 charged compounds Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010813 internal standard method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- 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
- G01N1/2294—Sampling soil gases or the like
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
Abstract
The invention belongs to the technical field of atmospheric environmental pollutant monitoring, and provides an unpowered hood type semi-volatile organic compound passive sampling device and a using method thereof. A passive sampling device for unpowered hood-type semi-volatile organic compounds comprises a hood, a connecting cylinder, a metal bracket, a sampling box, an adsorption material, a silicone tube, a gasket and a metal screen. The upper end of the connecting cylinder is opened to be in butt joint with the hood, and the lower end of the connecting cylinder is connected with an air pipe joint; the sampling box is connected with an air pipe joint at the bottom of the connecting cylinder through a silicone pipe; the bottom of the sampling box is provided with an opening, and a coarse screen, a fine screen and a gasket are sequentially arranged at the opening from bottom to top. The wind cap is driven to rotate under the action of wind power, so that the flow of air in the vertical direction is increased, the gas circulation speed in the sampling boxes is increased, the sampling rate is increased, the sampling time is shortened, the sampling rate of pollutants in the adsorbing materials of each sampling box is approximately consistent, and the difference of passive sampling rates caused by the difference of environmental conditions at different heights is corrected.
Description
Technical Field
The invention relates to the technical field of atmospheric environmental pollutant monitoring, in particular to an unpowered hood type semi-volatile organic compound passive sampling device and a using method thereof.
Background
Semi-volatile organic contaminants (SVOCs) refer to a class of compounds that are relatively volatile, insoluble in water, and readily soluble in organic solvents, with boiling points between 170-350 ℃. SVOCs are more difficult to degrade and exist in the environment for a longer period of time than volatile organics. The compounds are easy to be permanently existing in the environment such as air, water, soil and the like, can be transmitted for a long distance, and have certain toxicity and bioaccumulation in most cases. Recently, soil and air pollution by SVOCs has become increasingly important. The monitoring of the concentration of the SVOCs near the ground is beneficial to knowing the concentration change and migration trend between the soil and the atmosphere, is beneficial to grasping the soil-gas migration rule of the SVOCs, and provides theoretical basis for the control and reduction of SVOCs pollutants in the soil and the atmosphere.
The method for monitoring the concentration of SVOCs in air mainly comprises an active sampling method and a passive sampling method. The active sampler mainly utilizes the power air pump to pump air, has the advantages of short sampling time and accurate monitoring of instantaneous concentration, but the active sampler has high cost and huge volume, and needs a power supply during working, thereby being unfavorable for long-term sampling of multiple points in the field. In addition, the active sampler has disturbance to the surrounding air, which is unfavorable for the simultaneous acquisition of samples with different heights in a short distance. The passive sampler mainly adopts adsorption materials such as polyurethane foam, and utilizes the concentration gradient between air and the adsorption materials to absorb SVOCs in the air onto the adsorption materials when the air flow passes through the adsorption materials. The passive sampler has the advantages of low cost, no power supply and small interference to surrounding air, is widely used for monitoring semi-volatile organic pollutants in the atmospheric environment in the field and other regional ranges, but the existing polyurethane foam (PUF) passive sampler has longer sampling time and lower sampling rate, is easily influenced by environmental changes such as wind speeds at different heights in the field sampling process, changes the sampling rate, and causes larger deviation between the measured pollutant concentration and the actual concentration, so the sampler is necessary to be modified, the sampling speed of SVOCs is improved, the sampling time is shortened, and the difference of sampling rates at different heights or points is reduced.
Disclosure of Invention
The invention aims to provide a passive sampling device for Volatile Organic Compounds (VOC) of an unpowered hood and a use method thereof, which are used for solving the problems in the prior art, accelerating the air circulation speed in a sampling box through the rotation of the hood, properly improving the sampling speed, shortening the sampling time, realizing the rapid collection of the semi-volatile organic compounds in the atmosphere in a short time, and realizing the monitoring of the vertical section concentration of the soil of SVOCs by placing the sampling boxes at different heights. The device has applicability in the continuous passive sampling of the soil of the atmospheric gaseous semi-volatile organic compounds at different vertical heights for a long time.
In order to achieve the above object, the present invention provides the following technical solutions:
an unpowered hood type semi-volatile organic compound passive sampling device comprises a hood 8, a connecting cylinder 9, a metal bracket 11, a sampling box 2, an adsorption material 7, a silicone tube 10, a gasket 3, a fine screen 4 and a coarse screen 5; the upper end of the connecting cylinder 9 is opened and is in threaded connection with the hood 8, the lower end of the connecting cylinder is closed and is provided with a plurality of air pipe joints 1, the air pipe joints 1 and the hood are screwed tightly through threads, and the bottom of the connecting cylinder 9 is connected with the metal bracket 11; the top of the sampling box 2 is provided with a threaded round hole and is screwed with the air pipe joint 1, and the air pipe joint 1 on the connecting cylinder 9 is connected with the air pipe joint 1 on the sampling box 2 through a silicone tube 10; a bottom cover 6 with an opening is arranged at the opening of the bottom of the sampling box 2; a coarse screen 5, a fine screen 4, a gasket 3 and an adsorption material 7 are sequentially arranged in the sampling box 2 from bottom to top, and gaps exist between the gasket 3 and the adsorption material 7; the metal bracket 11 is placed perpendicular to the ground, the bottom is tip-shaped, the height direction of the metal bracket is provided with holes, and the metal binding belt 12 passes through the holes on the metal bracket 11 to fix the sampling box 2 on the metal bracket 11.
The diameter of the opening of the bottom cover 6 is smaller than that of the sampling box 2, so as to hold the adsorption material 7 in the sampling box 2, fix the coarse screen 5, the fine screen 4 and the gasket 3, and simultaneously facilitate the inflow of sampling gas.
The adsorbing material 7 is circular polyurethane foam, the diameter of the adsorbing material is larger than the inner diameter of the sampling box 2, the adsorbing material and the sampling box are tightly attached, the height of the adsorbing material is smaller than 2cm of the height of the sampling box 2, and the bottom of the adsorbing material 7 is 62cm away from the bottom cover during installation, so that interference of particle phases is further avoided.
The coarse screen 5 is 10 meshes; the fine screen 4 is 200 meshes; both materials are stainless steel, the shape is round, and the diameter is consistent with the inner diameter of the bottom cover 6; the gasket 3 has a sealing effect, is made of polytetrafluoroethylene, is in a circular ring shape, has an outer diameter consistent with the inner diameter of the bottom cover 6, and has an inner diameter consistent with the inner diameter of an opening of the bottom cover 6.
The connecting cylinder 9 is cylindrical and mainly made of stainless steel, threads are arranged in the opening at the top of the connecting cylinder 9, and the hood 8 is in butt joint with the connecting cylinder 9 through the threads; the sampling box 2 is made of stainless steel.
Five threaded round holes are uniformly distributed at the bottom of the connecting cylinder 9 or the number of the round holes is adjusted according to actual sampling conditions; the air pipe joint 1 is screwed with the connecting cylinder 9 through a round hole with threads.
The application method of the unpowered hood type semi-volatile organic compound passive sampling device is characterized by comprising the following steps of:
step one, before sampling, sequentially carrying out Soxhlet extraction on an adsorption material 7 by using acetone and dichloromethane, wherein the adsorption material 7 is polyurethane foam;
step two, the extracted adsorbing material 7 is subjected to vacuum drying to remove residual solvent, is wrapped by aluminum foil and sealed by a compact bag, and is placed in a refrigerator at the temperature of minus 20 ℃ for preservation;
step three, assembling a passive sampling device for the semi-volatile organic compounds of the unpowered hood, vertically inserting a metal bracket 11 into a position 10-15cm below the ground of a sampling point, and installing each sampling box 2 according to the specific height required by sampling to ensure that the air inlet at the bottom of each sampling box 2 is parallel to the ground;
and step four, sampling for 6-24 days, taking out the adsorption material 7, and carrying out subsequent treatment, determination and calculation to obtain a final concentration result.
Compared with the prior art, the invention has the following advantages:
1) The wind cap is driven to rotate under the action of wind power, so that the flow of air in the vertical direction is increased, the gas circulation speed in the sampling boxes is increased, the sampling rate is increased, the sampling time is shortened, the sampling rate of pollutants in the adsorbing materials of each sampling box is approximately consistent, and the difference of passive sampling rates caused by the difference of environmental conditions at different heights is corrected.
2. The air flow in the vertical direction generated by the rotation of the hood is weak, the disturbance to the air around the sampling point is very small, and the influence of the air is far lower than that of the active sampler.
3. The passive sampling device has the advantages of simple structure, portability, simple installation, convenient operation and no need of power supply, and can continuously sample the outdoor air at multiple points, multiple heights and medium and short periods.
4. The passive sampling device mainly adsorbs gaseous pollutants, and the existence of the screen mesh further avoids the interference of the particulate matters, so that the result is more accurate and reliable.
5. By placing the passive sampling device at different heights from the ground, air concentration information of SVOCs at different heights in the vertical direction of the soil is obtained, and further the soil-atmosphere diffusion trend and flux of the SVOCs are estimated.
6. According to different sampling purposes, the sampling height, the number of the sampling boxes and proper adsorption materials are flexibly set.
Drawings
FIG. 1 is a schematic diagram of a passive sampling device for non-powered hood-type semi-volatile organic compounds according to the present invention;
FIG. 2 (a) is a schematic diagram of a sample cartridge according to the present invention;
FIG. 2 (b) is a schematic diagram of an adsorbent material according to the present invention;
FIG. 3 is a schematic bottom view of the connector of the present invention;
FIG. 4 (a) is a schematic diagram showing the comparison of the sampling rate of the passive sampling device for the unpowered hood type semi-volatile organic compound and the common passive sampling device for different OPE monomers;
fig. 4 (b) is a schematic diagram showing comparison of sampling rates of the passive sampling device for the unpowered hood type semi-volatile organic compound and the common passive sampling device for different PAE monomers.
In the figure: 1. the device comprises an air pipe joint, a sampling box, a gasket, a fine screen, a coarse screen, a bottom cover, an adsorption material, a hood, a connecting cylinder, a silicone tube, a metal bracket and a metal binding belt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments, and it is apparent that the described embodiments are only examples, and do not represent all embodiments of the present invention, and other specific embodiments of the present invention also belong to the protection scope of the present invention.
The passive sampling device for the unpowered hood-type semi-volatile organic compounds as shown in fig. 1, 2 (a) and 2 (b) comprises a hood 8, a connecting cylinder 9, a metal bracket 11, a sampling box 2, an adsorption material 7, a silicone tube 10, a gasket 3, a fine screen 4 and a coarse screen 5. The lower extreme of hood 8 links to each other with connecting cylinder 9, connecting cylinder 9 bottom links to each other with metal support 11, connecting cylinder bottom installation air pipe joint 1 is connected through silicone tube 10 with the air pipe joint 1 at sampling box 2 top, plays the effect of accelerating the circulation of air.
The sampling boxes 2 are fixed on the metal bracket 11 at different heights; the bottom of the sampling box 2 is opened, a bottom cover 6 with a circular opening is fastened at the bottom, the coarse screen 5, the fine screen 4 and the gasket 3 are sequentially arranged on the bottom cover 6 from bottom to top, the coarse screen 5 and the fine screen 4 have the effect of intercepting atmospheric particulates and other impurities, and the gasket 3 plays a sealing role to prevent the particulates from entering the sampling box 2 from the gaps of the screen and the cover. The adsorption material 7 is tightly contacted with the inner wall of the sampling box 2, so that gaps are prevented from being left; the adsorption material 7 is polyurethane foam, has good adsorption effect on semi-volatile organic compounds, and can well reflect the concentration of the semi-volatile organic compounds in the ambient air.
As a preferred embodiment, the diameter of the hood 8 is 15cm, the diameter of the joint of the bottom and the connecting cylinder 9 is 10cm, and the hood 8 and the connecting cylinder are made of stainless steel.
The connecting cylinder 9 is cylindrical, is made of stainless steel, has a diameter of 10cm and a height of 15cm, is provided with an opening at the top end, is threaded at the opening, is connected with the bottom of the hood 8, and is connected with five stainless steel air pipe connectors 1 at the bottom. Meanwhile, the lower end of the connecting cylinder 9 is welded with a rectangular steel plate with holes, so that the connecting cylinder is convenient to fix on the metal bracket 11.
The sampling box 2 and the connecting cylinder 9 in the embodiment are connected through a silicone tube 10, and the inner diameter of the silicone tube 10 is 8cm, and the outer diameter of the silicone tube 10 is 12cm.
Fig. 2 (a) is a schematic diagram of the internal structure of a sampling box 2, wherein the sampling box 2 is made of stainless steel, has an inner diameter of 8cm and a height of 8cm, and is provided with a threaded opening on the upper cover for connecting with an air pipe joint 1; the lower end is open, a stainless steel bottom cover 6 is fastened, the inner diameter of the bottom cover 6 is 8cm, the bottom cover 6 is provided with a circular opening with the diameter of 7cm, the bottom cover 6 is provided with a side edge with the thickness of 0.5cm, and the bottom cover is used for installing a coarse screen 5, a fine screen 4 and a polytetrafluoroethylene gasket 3 from bottom to top; wherein the coarse screen 5 is 10 meshes and has a diameter of 8cm; the fine screen 4 is 200 meshes and has the diameter of 8cm; the gasket 3 is in a circular shape, the outer diameter is 8cm, and the inner diameter is 7.5cm; the open pore of the bottom cover 6 is convenient for the air flow to enter the inside of the sampling box 2 to contact with the adsorbing material 7, and the polyurethane foam adsorbing material is tightly arranged in the sampling box 2 to prevent gaps from being left between the polyurethane foam adsorbing material and the inner wall of the sampling box. The coarse screen 5 and the fine screen 4 are made of stainless steel, and are supported and filtered to prevent particles, soil, dust, ants and other solid impurities from entering the sampling box 2, and air uniformly enters the sampling box 2, and the gasket 3 is sealed to prevent the particles from entering the sampling box 2 through gaps between the screen and the bottom cover 6.
The sampling adsorption material 7 is made of polyurethane foam, is cylindrical in shape, is 8cm in diameter and 6cm in height, and is 2cm away from the bottom cover of the sampling box 2 at the bottom of the adsorption material 7 during installation, so that interference of particulate matters, rainwater and the like is further prevented.
The sampling box 2 is fixed on the hole of the triangle metal bracket 11 through the metal binding belt 12, the opening of the lower end of the sampling box 2 is parallel to the ground, the height and the number of the sampling boxes 2 are adjusted according to specific sampling requirements, and 5 heights are respectively 5cm, 10cm, 20cm, 40cm and 1.3m in the preferred scheme.
The metal bracket 11 is an angle steel bracket with the height of 165cm, holes are uniformly distributed on two side plates, the sampling box 2 is fixed by using the metal binding belt 12, the bottom 15cm of the metal bracket 11 is sharpened, and the metal bracket is inserted into soil for 15cm deep and used for fixing the sampling device.
The sampling method of the passive sampling device for the unpowered hood-type semi-volatile organic compounds comprises the following steps:
before sampling, the sampling box 2, the coarse screen 5, the fine screen 4, the gasket 3 and the like are placed in water added with detergent for soaking for 24 hours, then the water is washed clean by flowing tap water, the water is rinsed for 3 times, and the water is placed in an oven for drying, so that the cleaning of the sampler is ensured.
Before sampling, the polyurethane foam of the adsorbing material 7 is sequentially extracted for 72 hours by adopting acetone and dichloromethane so as to purify the sampling material to remove the background value; and after extraction, placing the polyurethane foam into a vacuum dryer, vacuumizing and drying to volatilize the solvent, packaging with aluminum foil paper, placing into a sealing bag, and placing into a refrigerator for preservation at-20 ℃.
Before sampling starts, the sampling device is assembled according to the mode shown in fig. 1, the tip end at the bottom of the metal bracket 11 is inserted into soil for 15cm, so that the sampling device is kept stable, the sampling boxes are assembled according to the mode shown in fig. 2 (a), the adsorption material 7 is tightly attached to the inner wall and placed into each sampling box 2 by using tweezers, the sampling boxes 2 are fixed to different heights of the metal bracket 11 according to requirements, the lower ends of the sampling boxes 2 are parallel to the ground, and sampling is started.
After the sampling is finished, the adsorbing material 7 is taken out by tweezers, wrapped by aluminum foil and put into a sealing bag, and then put into a refrigerator for preservation.
After the sampling is finished, the semi-volatile organic pollutants collected by the adsorption material 7 are extracted by an accelerating solvent extractor, extracted liquid nitrogen is blown to be less than 1ml, then the extracted liquid is passed through a silica gel column, the silica gel column is filled with anhydrous sodium sulfate and 3% deactivated silica gel, and mixed n-hexane is used for preparing the liquid nitrogen: dichloromethane=1:1 solvent elution, collecting the eluent, nitrogen-blowing concentration, solvent replacement, adding an internal standard substance, and on-machine detection.
And (3) analyzing and detecting the sample, and quantifying by an internal standard method according to the molecular ion peaks of the collected semi-volatile organic pollutants.
The following is a specific embodiment of the present invention to verify the beneficial effect of the passive sampler for non-powered hood-type semi-volatile organic compounds in practical application.
The experimental place is the outdoor roof of the college environment university of even construction, and the average wind speed during the experimental period is monitored to be 4.5m/s according to an anemometer.
Two passive sampling devices for the semi-volatile organic compounds of the unpowered hood are placed at the same height, sampling is carried out for 30 days, and the surrounding of a placing environment is free from shielding. Five passive samples are collected by each unpowered funnel cap semi-volatile organic compound sampling device, meanwhile, a common non-improved passive sampler is arranged at the same height to collect the passive samples, the passive samples and the common passive samples of the unpowered funnel cap semi-volatile organic compound sampling device are respectively recovered every six days, meanwhile, at the position 3m away from the passive sampling device, a large-flow active sampler (flow rate 100L/min) is utilized to synchronously collect suspended particles TSP (GF/A glass filter membrane) at the same height, the filter membrane and the PUF sample are calcined for 4 hours at 450 ℃ in advance, the PUF sample is collected every 6 days, the diameter is 6.5cm, the height is 7.5cm, and the large-flow active sampling filter membrane and the PUF sample are collected every 6 days, wherein each sample is about 1000m 3 Air. And (3) comparing the concentration of the non-powered cap semi-volatile organic compound passive sampler with that of the active sampler, and calculating the sampling rate of the non-powered cap semi-volatile organic compound passive sampler and the common passive sampler.
The experiment calculates the average sampling rates of 11 OPE monomers and 10 PAE monomers of two kinds of samplers within 30 days, and for comparison, the sampling rates are the average sampling rates of all monomers, and the result shows that the improved passive sampling device for the unpowered hood semi-volatile organic compounds has the sampling rate which is increased by 25% compared with the common passive samplers.
Table 1 comparison of sample rates of unpowered hood semi-volatile organic compound passive sampler and ordinary passive sampler (OPE)
Table 2 comparison of sample rates of unpowered hood semi-volatile organic compound passive sampler and ordinary passive sampler (PAE)
Claims (6)
1. The passive sampling device for the unpowered hood-type semi-volatile organic compounds is characterized by comprising a hood (8), a connecting cylinder (9), a metal bracket (11), a sampling box (2), an adsorption material (7), a silica gel tube (10), a gasket (3), a fine screen (4) and a coarse screen (5); the upper end of the connecting cylinder (9) is opened and is in threaded connection with the air cap (8), the lower end of the connecting cylinder is closed and is provided with a plurality of air pipe joints (1), the air pipe joints and the air pipe joints are screwed tightly through threads, and the bottom of the connecting cylinder (9) is connected with the metal bracket (11); the top of the sampling box (2) is provided with a threaded round hole and is screwed with the air pipe joint (1), and the air pipe joint (1) on the connecting cylinder (9) is connected with the air pipe joint (1) on the sampling box (2) through a silicone pipe (10); a bottom cover (6) with an opening is arranged at the opening of the bottom of the sampling box (2); a coarse screen (5), a fine screen (4), a gasket (3) and an adsorption material (7) are sequentially arranged in the sampling box (2) from bottom to top, and gaps exist between the gasket (3) and the adsorption material (7); the metal bracket (11) is placed perpendicular to the ground, the bottom is tip-shaped, openings are formed in the height direction of the metal bracket, and the metal binding belt (12) passes through the openings in the metal bracket (11) to fix the sampling box (2) on the metal bracket (11).
2. The passive sampling device for non-powered hood-type semi-volatile organic compounds according to claim 1, wherein the diameter of the opening of the bottom cover (6) is smaller than the diameter of the sampling box (2) for holding the adsorption material (7) in the sampling box (2), fixing the coarse screen (5), the fine screen (4) and the gasket (3), and simultaneously facilitating the inflow of sampling gas.
3. The passive sampling device for the unpowered hood-type semi-volatile organic compounds according to claim 1, wherein the adsorbing material (7) is circular polyurethane foam, the diameter of the adsorbing material is larger than the inner diameter of the sampling box (2), the adsorbing material and the sampling box are tightly attached, the height of the adsorbing material is smaller than 2cm of the height of the sampling box (2), and the bottom of the adsorbing material (7) is 2cm away from the bottom cover (6) during installation, so that interference of particle phases is further avoided.
4. The passive sampling device for unpowered hood-type semi-volatile organic compounds as claimed in claim 1, wherein the coarse screen (5) is 10 mesh; the fine screen (4) is 200 meshes; both materials are stainless steel, the shape is round, and the diameter is consistent with the inner diameter of the bottom cover (6); the gasket (3) is made of polytetrafluoroethylene, is in a circular ring shape, has an outer diameter consistent with the inner diameter of the bottom cover (6), and has an inner diameter consistent with the inner diameter of an opening of the bottom cover (6).
5. Passive sampling device for non-powered hood-type semi-volatile organic compounds according to claim 1, characterized in that the connecting cylinder (9) is cylindrical, mainly made of stainless steel; the sampling box (2) is made of stainless steel.
6. The method of using an unpowered hood type semi-volatile organic compound passive sampling device according to any one of claims 1 to 5, comprising the steps of:
step one, before sampling, sequentially carrying out Soxhlet extraction on an adsorption material (7) by using acetone and dichloromethane, wherein the adsorption material (7) is polyurethane foam;
step two, the extracted adsorption material (7) is subjected to vacuum drying to remove residual solvent, aluminum foil is used for wrapping and a compact bag is used for sealing, and the adsorption material is placed in a refrigerator at the temperature of minus 20 ℃ for preservation;
step three, assembling a passive sampling device for the semi-volatile organic compounds of the unpowered hood, vertically inserting a metal bracket (11) into a position 10-15cm below the ground of a sampling point, and installing each sampling box (2) according to the specific height required by sampling to ensure that an air inlet at the bottom of each sampling box (2) is parallel to the ground;
and step four, sampling for 6-24 days, taking out the adsorption material (7), and carrying out subsequent treatment, determination and calculation to obtain a final concentration result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111104086.9A CN113865945B (en) | 2021-09-22 | 2021-09-22 | Unpowered hood type semi-volatile organic compound passive sampling device and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111104086.9A CN113865945B (en) | 2021-09-22 | 2021-09-22 | Unpowered hood type semi-volatile organic compound passive sampling device and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113865945A CN113865945A (en) | 2021-12-31 |
| CN113865945B true CN113865945B (en) | 2024-02-06 |
Family
ID=78992998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111104086.9A Active CN113865945B (en) | 2021-09-22 | 2021-09-22 | Unpowered hood type semi-volatile organic compound passive sampling device and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113865945B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486400B (en) * | 2022-03-24 | 2024-04-30 | 中国科学院青藏高原研究所 | Passive sampler for collecting microplastic in atmosphere and use method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101493384A (en) * | 2009-02-20 | 2009-07-29 | 北京大学 | Half-volatilization persistency organic contaminant near groundlevel concentration vertical profile sampling apparatus |
| CA2669901A1 (en) * | 2009-06-19 | 2010-12-19 | Hong Mao Tang | Multigas passive sampler |
| CN102323111A (en) * | 2011-08-15 | 2012-01-18 | 西北核技术研究所 | Method for sampling ultrahigh flow aerosol and sampler |
| KR20140010697A (en) * | 2012-07-16 | 2014-01-27 | 국립대학법인 울산과학기술대학교 산학협력단 | Passive air sampler |
| CN105817082A (en) * | 2016-05-11 | 2016-08-03 | 石烨 | Gas particulate matter unpowered purification equipment and gas particulate matter recycling method |
| CN106124256A (en) * | 2016-06-27 | 2016-11-16 | 中国科学院青藏高原研究所 | A kind of Passive sampler, its using method and application |
| CN206604337U (en) * | 2017-04-01 | 2017-11-03 | 西安工程大学 | A kind of unpowered blast cap dust arrester |
| CN212929159U (en) * | 2020-07-01 | 2021-04-09 | 北京鑫广进燃气设备研究所 | Automatic ventilation diffusing tower |
-
2021
- 2021-09-22 CN CN202111104086.9A patent/CN113865945B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101493384A (en) * | 2009-02-20 | 2009-07-29 | 北京大学 | Half-volatilization persistency organic contaminant near groundlevel concentration vertical profile sampling apparatus |
| CA2669901A1 (en) * | 2009-06-19 | 2010-12-19 | Hong Mao Tang | Multigas passive sampler |
| CN102323111A (en) * | 2011-08-15 | 2012-01-18 | 西北核技术研究所 | Method for sampling ultrahigh flow aerosol and sampler |
| KR20140010697A (en) * | 2012-07-16 | 2014-01-27 | 국립대학법인 울산과학기술대학교 산학협력단 | Passive air sampler |
| CN105817082A (en) * | 2016-05-11 | 2016-08-03 | 石烨 | Gas particulate matter unpowered purification equipment and gas particulate matter recycling method |
| CN106124256A (en) * | 2016-06-27 | 2016-11-16 | 中国科学院青藏高原研究所 | A kind of Passive sampler, its using method and application |
| CN206604337U (en) * | 2017-04-01 | 2017-11-03 | 西安工程大学 | A kind of unpowered blast cap dust arrester |
| CN212929159U (en) * | 2020-07-01 | 2021-04-09 | 北京鑫广进燃气设备研究所 | Automatic ventilation diffusing tower |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113865945A (en) | 2021-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103344461B (en) | A kind of persistence organic pollutant passive sampling apparatus | |
| CN101476993B (en) | Passive semi-volatile atmosphere organic pollutant sampling apparatus | |
| CN105466737B (en) | Gaseous PAHs Passive sampler and its sampling determination method in a kind of case experiment | |
| CN113865945B (en) | Unpowered hood type semi-volatile organic compound passive sampling device and application method thereof | |
| CN103353409B (en) | Possesses the atmospheric sampling equipment of temperature adjusting function | |
| CN101865794B (en) | Passive sampling device for gaseous mercury in air | |
| CN202676520U (en) | Device for collecting different species of mercury in atmosphere | |
| CN102680284A (en) | Passive sampling device for persistent organic pollutants (POPs) in air | |
| CN104678062A (en) | VOC (volatile organic compound) gas and non-methane total hydrocarbon gas sampling and detecting system | |
| CN112683600A (en) | Full-automatic fog sampler based on sensor control and application method thereof | |
| CN102944449A (en) | Passive sampling device of multi-component atmospheric organic pollutants | |
| CN205333366U (en) | Four properties way atmospheric sampling ware | |
| CN211205925U (en) | Inflammable gas monitoring meter | |
| CN103278355A (en) | Atmospheric sampling equipment | |
| CN109632406B (en) | Prevent animal invasion atmospheric sampling equipment | |
| CN205333365U (en) | Passive sample thief of polyurethane rainfall runoff | |
| CN204718318U (en) | A kind of Bioexperiment device drying baker | |
| CN205562482U (en) | Device of phthalate content among tracer gas | |
| CN104857815B (en) | A kind of device and its sorbent preparation method suitable for sewer pernicious gas in-situ control | |
| CN104729878A (en) | Novel passive water body sampling technique based on supported ionic liquid | |
| CN104568521B (en) | A kind of passive sampling apparatus of air reactive gaseous mercury | |
| CN103760004A (en) | Solvent desorption device and method | |
| CN103674624A (en) | Sampling membrane and sampler capable of enriching heavy metals in ambient air and application method of sampler | |
| JP2007047104A (en) | Method and apparatus for measuring 14co2 flux by using flowing-gas technique | |
| CN108918350A (en) | Stationary source dustiness and water soluble ion device and method for catching are captured simultaneously |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |