CN117929206A - Method and system for detecting nano aerosol particles - Google Patents
Method and system for detecting nano aerosol particles Download PDFInfo
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- CN117929206A CN117929206A CN202410302180.2A CN202410302180A CN117929206A CN 117929206 A CN117929206 A CN 117929206A CN 202410302180 A CN202410302180 A CN 202410302180A CN 117929206 A CN117929206 A CN 117929206A
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- 239000000443 aerosol Substances 0.000 title claims abstract description 204
- 239000002245 particle Substances 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011159 matrix material Substances 0.000 claims abstract description 48
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 238000009833 condensation Methods 0.000 claims abstract description 13
- 230000005494 condensation Effects 0.000 claims abstract description 13
- 238000000889 atomisation Methods 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002105 nanoparticle Substances 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 4
- 229920000557 Nafion® Polymers 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000002274 desiccant Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 15
- 238000007873 sieving Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003920 environmental process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The invention discloses a method and a system for detecting nano aerosol particles, which relate to the technical field of environment detection and comprise the following steps: (1) generating a matrix aerosol of inert particles; (2) drying the matrix aerosol; (3) Charging the dried matrix aerosol to obtain charged matrix aerosol; (4) Sieving nano aerosol particles to be detected through a nano aerosol grading device to obtain bipolar nano aerosol with specified particle size; (5) Enabling the charged matrix aerosol to adsorb bipolar nano aerosol to form matrix nano aerosol; (6) The matrix nano-aerosols were detected by a single particle aerosol mass spectrometer. The system comprises: comprises an aerosol atomization generator, an aerosol diffusion drying pipe, an aerosol charger, a condensation container and a single-particle aerosol mass spectrometer which are sequentially communicated, and also comprises a nano aerosol grading device. Realizing the high-efficiency on-line detection of the nano aerosol particles.
Description
Technical Field
The invention relates to the technical field of environment detection, in particular to a method and a system for detecting nano aerosol particles.
Background
In the atmosphere environment, the nano aerosol mainly comes from traffic tail gas and industrial emission, has low self gravity sedimentation speed relative to submicron and micron-scale aerosol particles, can be transmitted in the air for medium and long distances, has very complex influence processes on human health, global radiation balance and other environmental processes, and needs to have enough knowledge on the particle size and chemical composition of the nano aerosol under different time and space for deep understanding of the influence of the nano aerosol on the environmental ecological cycle process.
At present, the online detection and analysis means of the particle size and chemical components of single aerosol particles are mainly single particle aerosol mass spectrometers. The single-particle aerosol mass spectrometer mainly comprises an aerosol sample injection system, a diameter measurement system and a flight time mass analysis system, wherein an external aerosol sample is introduced into the internal vacuum environment of the system by the aerosol sample injection system, is aggregated into a collimated particle beam based on particle inertia, and then enters the diameter measurement system and the flight time mass analysis system in an accelerating way, so that the flight speed and the mass spectrogram of single particles are sequentially measured, and the corresponding particle size and chemical composition are further obtained.
The single-particle aerosol mass spectrometer can monitor aerosol particles in the range of 0.1-2.5 microns in a conventional atmospheric environment on line, but has lower detection efficiency for particles below 0.1 microns, and is mainly limited by an aerosol sample injection system and a diameter measurement system. The aerosol sample injection system is mainly based on the principle of particle inertia, and performs step-by-step focusing through aerodynamic lenses of a plurality of pore plate structures, so that aerosol particles become collimated particle beams, and the collimated particle beams are accelerated through an acceleration nozzle and enter a subsequent detection system. The particle size of the nano aerosol particles is only between a few nanometers and tens of nanometers, the inertia is relatively weak, and the nano aerosol particles are difficult to effectively gather and sample through an aerosol sample injection system, so that the detection efficiency of a subsequent detection system is low or the detection cannot be performed; the diameter measuring system is usually a double-beam diameter measuring system based on the particle light scattering principle, the dimension of the nano particles is too small compared with the laser wavelength, and the scattering signal is weak, so that the flying speed of the particles cannot be effectively detected, and further the corresponding particle size cannot be measured, and the mass spectrogram of the corresponding particles cannot be accurately detected by the flying time mass analysis system.
In order to try to detect nano aerosol particles by a single-particle aerosol mass spectrometer, early students tried to introduce a differential electric mobility analyzer at the upstream of a sample injection system to screen and sample the particle size of the nano aerosol particles, and analyze the chemical components of the nano aerosol particles in a 'touch typing' mode, namely, fix the ionization laser frequency under the condition of not using a double-beam diameter measuring system, and randomly ionize the screened nano aerosol particles. The detection efficiency of the method is extremely low and is almost close to 0, and the data validity is also doubtful. Thus, there is little progress in the current research of the application of nano-aerosol particles on single particle mass spectrometers.
Disclosure of Invention
The invention aims to provide a method and a system for detecting nano aerosol particles, which are used for solving the problems in the prior art and realizing the detection of the nano aerosol particles.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a method for detecting nano aerosol particles, which comprises the following steps:
(1) Atomizing the inert standard particle solution by an aerosol atomization generator to generate a matrix aerosol of inert particles;
(2) Drying the matrix aerosol;
(3) Charging the dried matrix aerosol to obtain charged matrix aerosol;
(4) Screening nano aerosol particles to be detected by a nano aerosol grading device while performing the steps (1) - (3) to obtain bipolar nano aerosol with specified particle size;
(5) The charged matrix aerosol and the bipolar nano aerosol are led into the same cavity, so that the charged matrix aerosol adsorbs the bipolar nano aerosol on the surface through electrostatic adsorption to form matrix nano aerosol;
(6) The matrix nano-aerosols are detected by a single particle aerosol mass spectrometer.
Preferably, the particle size of the matrix aerosol is 200 nm-1000 nm.
Preferably, the inert particles are silica particles.
Preferably, in step (2), the matrix aerosol is dried by means of an aerosol diffusion drying tube; the aerosol diffusion drying tube adopts a Nafion drying tube or a silica gel drying agent is arranged in the aerosol diffusion drying tube.
The invention also provides a system for detecting nano aerosol particles, which is used for realizing the method for detecting nano aerosol particles, and comprises an aerosol atomization generator, an aerosol diffusion drying pipe, an aerosol charger, a condensation container and a single-particle aerosol mass spectrometer which are sequentially communicated, and also comprises a nano aerosol grading device; the device is characterized in that a rectifying grid is arranged in the condensation container, the cavity in the condensation container is divided into a converging cavity and a condensing cavity by the rectifying grid, the converging cavity is positioned above the condensing cavity, a discharge port of the nano aerosol grading device and a discharge port of the aerosol charger are respectively communicated with the converging cavity, and the bottom end of the condensing cavity is communicated with a feed port of the single-particle aerosol mass spectrometer.
Preferably, the condensing device further comprises an exhaust pump, an air filter and an exhaust pipe, wherein an air inlet of the exhaust pump is communicated with an air outlet end of the air filter, and an air inlet end of the air filter is communicated with the bottom end of the condensing container through the exhaust pipe.
Preferably, the nano aerosol classifying device adopts a nano particle differential electric mobility classifying device or an aerodynamic aerosol classifying device.
Compared with the prior art, the invention has the following technical effects:
The method and the system for detecting nano aerosol particles are based on the characteristic that the traditional single-particle aerosol mass spectrometer can efficiently detect 0.2-1 micron particles on line, and by introducing a mode of adsorbing and condensing nano aerosol by using charged matrix aerosol to form matrix nano aerosol, the nano aerosol can efficiently detect and analyze chemical component information of the nano aerosol by the single-particle aerosol mass spectrometer through the matrix aerosol with proper particle size, and by combining a nano aerosol classification device, the efficient on-line detection of the particle size and the chemical component information of the nano aerosol particles by the traditional single-particle aerosol mass spectrometer is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of detecting nano-aerosol particles of the present invention;
FIG. 2 is a schematic diagram of a system for detecting nano-aerosol particles according to the present invention;
Wherein:
100. an aerosol atomization generator;
200. An aerosol diffusion drying tube;
300. An aerosol charger;
400. A nano aerosol grading device;
500. A coagulation vessel; 501. converging the cavities; 502. a rectifying grille; 503. a coagulation cavity; 504. an exhaust pipe; 505. an air filter; 506. an exhaust pump;
600. Single particle aerosol mass spectrometer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
The invention aims to provide a method and a system for detecting nano aerosol particles, which are used for solving the problems in the prior art and realizing the detection of the nano aerosol particles.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1, the present embodiment provides a method for detecting nano aerosol particles, which includes the following steps:
(1) Atomizing the inert standard particle solution by an aerosol atomization generator 100 to generate a matrix aerosol of inert particles;
(2) Drying the matrix aerosol;
(3) Charging the dried matrix aerosol to obtain charged matrix aerosol;
(4) Screening nano aerosol particles to be detected by a nano aerosol classification device 400 while performing the steps (1) - (3) to obtain bipolar nano aerosol with specified particle size;
(5) Charging the charged matrix aerosol and the bipolar nano aerosol into the same cavity, so that the charged matrix aerosol adsorbs the bipolar nano aerosol on the surface through electrostatic adsorption to form the matrix nano aerosol;
(6) The matrix nano-aerosols are detected by single particle aerosol mass spectrometer 600.
In an alternative of this embodiment, the particle size of the matrix aerosol is preferably 200nm to 1000nm.
The inert particles in the inert standard particle solution need to be inert particles that do not interfere with the detection structure of the single particle aerosol mass spectrometer 600, such as silica particles, and the particle size range of the inert particles is about 0.1 to 1 μm.
In the alternative of the present embodiment, it is preferable that in step (2), the matrix aerosol is dried through the aerosol diffusion drying tube 200; the aerosol diffusion dryer tube 200 adopts a Nafion dryer tube or a silica gel dryer is arranged in the aerosol diffusion dryer tube 200.
Example two
As shown in fig. 2, the present embodiment provides a system for detecting nano aerosol particles, which is used to implement the method for detecting nano aerosol particles in the first embodiment, and has the following features:
The system for detecting nano aerosol particles in the embodiment comprises an aerosol atomization generator 100, an aerosol diffusion drying tube 200, an aerosol charger 300, a condensation container 500 and a single-particle aerosol mass spectrometer 600 which are sequentially communicated, and further comprises a nano aerosol classification device 400; the condensation container 500 is airtight, a rectification grating 502 is arranged in the condensation container 500, the rectification grating 502 divides a cavity in the condensation container 500 into a converging cavity 501 and a condensing cavity 503, the converging cavity 501 is positioned above the condensing cavity 503, a discharge port of the nano aerosol classifying device 400 and a discharge port of the aerosol charger 300 are respectively communicated with the converging cavity 501, and the bottom end of the condensing cavity 503 is communicated with a feed port of the single-particle aerosol mass spectrometer 600.
In the alternative of the embodiment, it is preferable that the condensing device further comprises an exhaust pump 506, an air filter 505 and an exhaust pipe 504, wherein an air inlet of the exhaust pump 506 is communicated with an air outlet end of the air filter 505, and an air inlet end of the air filter 505 is communicated with the bottom end of the condensing container 500 through the exhaust pipe 504; the excess gas at the bottom of the condensation cavity 503 may be pumped out by the exhaust pump 506 through the exhaust pipe 504, the air filter 505 and the exhaust pump 506.
The nano-aerosol classifying device 400 adopts a nano-particle differential electric mobility classifying device or an aerodynamic aerosol classifying device, and the aerodynamic aerosol classifying device specifically adopts an aerosol dynamic particle size screening device (Aerodynamic Aerosol Classifier) manufactured by Cambustion company in the United kingdom.
It should be noted that, the aerosol atomization generator 100, the aerosol diffusion drying tube 200, the aerosol charger 300, the nanoparticle differential electric mobility grading device, the aerodynamic aerosol grading device and the single particle aerosol mass spectrometer 600 adopted in the system for detecting nano aerosol particles in this embodiment all adopt existing instruments existing in the market, so specific structures and working principles of the above devices are not repeated in this embodiment.
The specific working principle of the system for detecting nano aerosol particles in this embodiment is as follows:
The aerosol atomization generator 100 atomizes the inert standard particle solution to generate matrix aerosol of inert particles, the matrix aerosol flows into the aerosol diffusion drying tube 200 for drying and then flows into the aerosol charger 300, and the aerosol charger 300 charges the matrix aerosol in a soft X-ray mode, a corona discharge mode and the like to obtain charged matrix aerosol; meanwhile, nano aerosol particles to be detected are screened by the nano aerosol grading device 400 to obtain bipolar nano aerosol with specified particle size (the particle size of the required bipolar nano aerosol is determined by technicians according to actual needs);
then, the charged matrix aerosol and the bipolar nano aerosol are converged in the converging cavity 501 and then rectified through the rectifying grating 502 to form a stable flow field, then enter the condensing cavity 503 to perform electrostatic adsorption condensation, the charged matrix aerosol adsorbs the bipolar nano aerosol on the surfaces of matrix particles through electrostatic adsorption in the process to form matrix nano aerosol, and finally enter the single-particle aerosol mass spectrometer 600 to complete nano aerosol mass spectrogram detection.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. A method of detecting nano-aerosol particles, comprising the steps of:
(1) Atomizing the inert standard particle solution by an aerosol atomization generator to generate a matrix aerosol of inert particles;
(2) Drying the matrix aerosol;
(3) Charging the dried matrix aerosol to obtain charged matrix aerosol;
(4) Screening nano aerosol particles to be detected by a nano aerosol grading device while performing the steps (1) - (3) to obtain bipolar nano aerosol with specified particle size;
(5) The charged matrix aerosol and the bipolar nano aerosol are led into the same cavity, so that the charged matrix aerosol adsorbs the bipolar nano aerosol on the surface through electrostatic adsorption to form matrix nano aerosol;
(6) The matrix nano-aerosols are detected by a single particle aerosol mass spectrometer.
2. The method for detecting nano-aerosol particles according to claim 1, wherein the particle size of the matrix aerosol is 200nm to 1000nm.
3. The method of detecting nano-aerosol particles of claim 1, wherein: the inert particles are silica particles.
4. The method of detecting nano-aerosol particles of claim 1, wherein: in step (2), drying the matrix aerosol through an aerosol diffusion drying tube; the aerosol diffusion drying tube adopts a Nafion drying tube or a silica gel drying agent is arranged in the aerosol diffusion drying tube.
5. A system for detecting nano-aerosol particles for implementing the method for detecting nano-aerosol particles according to any of claims 1 to 4, characterized in that: comprises an aerosol atomization generator, an aerosol diffusion drying pipe, an aerosol charger, a condensation container and a single-particle aerosol mass spectrometer which are sequentially communicated, and also comprises a nano aerosol grading device; the device is characterized in that a rectifying grid is arranged in the condensation container, the cavity in the condensation container is divided into a converging cavity and a condensing cavity by the rectifying grid, the converging cavity is positioned above the condensing cavity, a discharge port of the nano aerosol grading device and a discharge port of the aerosol charger are respectively communicated with the converging cavity, and the bottom end of the condensing cavity is communicated with a feed port of the single-particle aerosol mass spectrometer.
6. The system for detecting nano-aerosol particles of claim 5, wherein: the condensing device comprises a condensing container, and is characterized by further comprising an exhaust pump, an air filter and an exhaust pipe, wherein an air inlet of the exhaust pump is communicated with an air outlet end of the air filter, and an air inlet end of the air filter is communicated with the bottom end of the condensing container through the exhaust pipe.
7. The system for detecting nano-aerosol particles of claim 5, wherein: the nano aerosol classifying device adopts a nano particle differential electric mobility classifying device or an aerodynamic aerosol classifying device.
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| WO2019057379A1 (en) * | 2017-09-22 | 2019-03-28 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Device for real-time detection and chemical identification of particles contained in aerosols, in particular in atmospheric aerosols |
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| CN117059470A (en) * | 2023-06-20 | 2023-11-14 | 暨南大学 | Micro-nano single particle mass instrument based on critical hole cutting sample injection |
| WO2024009203A1 (en) * | 2022-07-04 | 2024-01-11 | ETH Zürich | Device and method for the determination of the size and electric charge distribution of an ensemble of particles |
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- 2024-03-18 CN CN202410302180.2A patent/CN117929206B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1045242A2 (en) * | 1999-04-15 | 2000-10-18 | I.F.T. Institut für Troposphärenforschung e.V. | Process and device for sizeresolved chemical and physical determination of aerosol particles |
| CN104792854A (en) * | 2015-03-31 | 2015-07-22 | 广州禾信分析仪器有限公司 | System and method for real-time and on-line rapid mass spectrometry analysis on chemical compositions of sub-micron aerosol |
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