CN110146523B - Atmospheric gaseous pollutant and particulate matter in-situ reaction device and detection method - Google Patents
Atmospheric gaseous pollutant and particulate matter in-situ reaction device and detection method Download PDFInfo
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Abstract
The invention relates to an in-situ reaction device and a detection method for atmospheric gaseous pollutants and particulate matters, belongs to the technical field of atmospheric multiphase reaction detection, and solves the problem that the in-situ reaction device and the detection method for the gaseous pollutants and the particulate matters based on the actual environment are lacked in the prior art. The in-situ reaction device comprises a sample introduction unit, a reaction unit and a sampling unit which are connected in sequence, wherein the sample introduction unit is used for introducing samples of atmospheric gaseous pollutants and particulate matters; the reaction unit comprises a first reaction chamber, a second reaction chamber and a third reaction chamber which have the same structure; a first objective table is arranged in the first reaction chamber, a first hole groove is formed in the first objective table, and the first hole groove is used for fixing a first particulate matter loading sheet; the sampling unit is used for detecting the gas flow rate and the accumulated flow. The invention can perform reaction simulation and product detection based on gaseous pollutants and particulate matters in the actual environment.
Description
Technical Field
The invention relates to the technical field of atmospheric multiphase reaction detection, in particular to an in-situ reaction device and a detection method for atmospheric gaseous pollutants and particulate matters.
Background
Gaseous pollutants in the atmosphere, including NOx, SO2、O3Inorganic acids (sulfuric acid, nitric acid, etc.), organic acids (formic acid, acetic acid, etc.), and the like. The gaseous pollutants are subjected to multiphase reaction on the surface of the particles to form complex secondary inorganic aerosol and secondary organic aerosol.
The components in the real atmosphere are very complex and comprise inorganic gas, organic volatile gas and once-discharged particles such as black carbon, minerals, fly ash and the like. The existing research is mainly based on external field observation and laboratory simulation, and an in-situ reaction device of gas pollutants and particulate matters based on the actual environment is lacked.
Disclosure of Invention
In view of the above analysis, the embodiments of the present invention are directed to an in-situ reaction apparatus for atmospheric gaseous pollutants and particulate matters and a detection method thereof, so as to solve the problem that the prior art lacks an in-situ reaction apparatus for gaseous pollutants and particulate matters based on actual environment.
The invention discloses an in-situ reaction device for atmospheric gaseous pollutants and particulate matters, which comprises a sample introduction unit, a reaction unit and a sampling unit which are sequentially connected, wherein the sample introduction unit is used for introducing samples of the atmospheric gaseous pollutants and the particulate matters; the reaction unit comprises a first reaction chamber, a second reaction chamber and a third reaction chamber which have the same structure; a first objective table is arranged in the first reaction chamber, a first hole groove is formed in the first objective table, and the first hole groove is used for fixing a first particulate matter loading sheet; the sampling unit is used for detecting the gas flow rate and the accumulated flow.
In one possible design, the first reaction chamber is a dark reaction chamber; the second reaction chamber is a light source irradiation reaction chamber; the third reaction chamber is a blank control reaction chamber; a first valve, a second valve and a third valve for regulating the flow of gaseous pollutants are correspondingly arranged at the inlet and the outlet of the first reaction chamber to the third reaction chamber; the light source comprises a xenon lamp, an ultraviolet lamp tube, a halogen lamp, a deuterium lamp or an LED lamp.
In one possible design, the reaction unit further comprises a fourth reaction chamber, the fourth reaction chamber being a heavily polluted air reaction chamber; and a fourth valve for regulating the air flow is arranged at the inlet and the outlet of the fourth reaction chamber.
In one possible design, a first particulate loading sheet is used to carry the particulate matter of minerals and metal oxides; minerals and metal oxides are used to react with gaseous pollutants to form new particulate matter.
In one possible design, the first particulate loading sheet comprises a copper mesh, a silicon wafer, or 111 glass.
In one possible design, the sampling unit includes a sampling pump and a gas flow rate controller; the sampling pump is used for pumping atmospheric gaseous pollutants and particulate matters into the reaction unit; the gas flow rate controller is used for detecting the instantaneous flow rate and the accumulated flow of the gas passing through the sampling pump.
In a possible design, the sample introduction unit comprises a gas pipeline and a particulate matter removing device, the particulate matter removing device comprises a filter membrane, and the filter membrane is made of one of polytetrafluoroethylene, quartz and glass fibers.
In one possible design, the gas flow rate controller is a mass flow meter, float flow meter or restricted orifice.
The invention also discloses an in-situ detection method of the atmospheric gaseous pollutants and the particulate matters, which adopts the in-situ reaction device of the atmospheric gaseous pollutants and the particulate matters, and the in-situ detection method comprises the following steps:
s1, pumping gas into a reaction unit by using a sampling unit, and removing particles in the air to form gaseous pollutants after the gas passes through a sample injection unit;
s2, introducing gaseous pollutants into the dark reaction chamber and the light source irradiation reaction chamber, reacting with the particles in the dark reaction chamber and the light source irradiation reaction chamber to generate new particles, wherein the particles identical to the dark reaction chamber and the light source irradiation reaction chamber are arranged in the blank control reaction chamber;
and S3, characterizing and analyzing the newly generated particles in the light source irradiation reaction chamber and the dark reaction chamber by adopting a Transmission Electron Microscope (TEM) and an EDX spectrometer respectively.
Further, in step S2, atmospheric gaseous pollutants are simultaneously introduced into the heavily polluted air reaction chamber, and the particulate matter in the heavily polluted air reaction chamber is the same as that in the dark reaction chamber and the blank reaction chamber.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
(1) the in-situ reaction device is provided with a light source irradiation reaction chamber, a dark reaction chamber, a blank contrast reaction chamber and a heavily polluted air reaction chamber, wherein the blank contrast reaction chamber can realize sharp contrast with the dark reaction and the gas-solid reaction under the irradiation of the light source. The reaction chamber with different determination conditions can perform in-situ reaction on atmospheric gas pollutants and particles based on actual environment, so that the atmospheric gas pollutants react with the selected solid particle sample, and the appearance and element analysis of the reacted sample are tested through the appearance of a transmission electron microscope or a scanning electron microscope and EDS.
(2) Through setting up the sampling unit of being connected with the reaction unit, not only can the accurate instantaneous velocity of flow and the accumulative total flow that detects through flow control valve, the sampling pump can also be with the velocity of flow of invariant with the atmospheric gaseous pollutant suction correspond the reaction indoor, guarantee that the normal position reaction goes on smoothly.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of an in-situ reaction apparatus for atmospheric gaseous pollutants and particulate matters provided in example 1;
FIG. 2 is a schematic structural view of a first reaction chamber provided in example 1;
FIG. 3 is a TEM image of new particles generated under the irradiation of an LED lamp according to example 3 of the present invention;
FIG. 4 is a TEM image of a sample of particles in a blank control chamber as provided in example 3 of the present invention.
Reference numerals:
1-a sampling pump; 2-gas flow rate controller; 3-a fourth stage 3; 4-fourth particulate loading slide 4; 5-a particulate removal device; 6-gas line; 7-dark reaction chamber; 8-a light source reaction chamber; 9-blank control reaction chamber; 10-heavy polluted air reaction chamber; 11-a third valve; 12-an optical filter; 13-a first stage; 14-first reaction chamber.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Example 1
The embodiment discloses an in-situ reaction device for atmospheric gaseous pollutants and particulate matters, which comprises a sample introduction unit, a reaction unit and a sampling unit which are sequentially connected as shown in fig. 1 and fig. 2, wherein the sample introduction unit is used for introducing samples of the atmospheric gaseous pollutants and the particulate matters; the reaction unit comprises a first reaction chamber 14, a second reaction chamber and a third reaction chamber which have the same structure; a first objective table 13 is arranged in the first reaction chamber 14, and a first hole groove is formed in the first objective table 13 and used for fixing a first particulate matter loading sheet; the sampling unit is used for detecting the gas flow rate and the accumulated flow.
Exemplarily, the reaction device comprises a sample introduction unit, a reaction unit and a sampling unit which are connected in sequence, wherein atmospheric gaseous pollutants and particulate matters firstly enter the sample introduction unit, only gaseous pollutants are left after the particulate matters in the atmosphere are filtered by the sample introduction unit, and the part of the gaseous pollutants enter the reaction unit connected with the sample introduction unit; the reaction unit comprises a first reaction chamber 14, a second reaction chamber and a third reaction chamber which are identical in structure, a first objective table 13 is arranged in the first reaction chamber 14, a first hole groove is formed in the first objective table 13, a first particulate matter loading sheet is arranged in the first hole groove, the first hole groove is used for fixing the first particulate matter loading sheet, in addition, a first optical filter is arranged on the first reaction chamber, and the first optical filter is used for sealing the first reaction chamber; correspondingly, a second objective table is arranged in the second reaction chamber, a second hole groove is formed in the second objective table, a second particulate matter loading sheet is arranged in the second hole groove, and the second hole groove is also used for fixing the second particulate matter loading sheet; a third object carrying table is arranged in the third reaction chamber, a third hole groove is formed in the third object carrying table, a third particle loading sheet is arranged in the third hole groove, and the third hole groove is also used for fixing the third particle loading sheet; gaseous pollutants entering from the sample introduction unit respectively enter the first reaction chamber and the second reaction chamber and react with corresponding particles on the first particle loading sheet and the second particle loading sheet in the first reaction chamber and the second reaction chamber to generate new particles; and the residual gas after the reaction is discharged by adopting a unit, and the sampling unit is used for detecting the gas flow rate and the accumulated flow.
Compared with the prior art, the method can perform in-situ reaction simulation and product detection on the gas pollutants and the particulate matters based on the actual environment, and has the advantages of removing the existing particulate matters in the atmosphere and only enabling the polluted gas in the atmosphere to act on the selected particulate sample. Determining which pollution forming process is the main process by detecting a product after reaction, wherein a particulate matter sample can adopt single components such as quartz, calcium carbonate, kaolin and the like, and the change of the surface components, the appearance and other properties of the particulate matter is determined after the particulate matter sample reacts with atmospheric gaseous pollutants; actual particulate matter, such as direct-emission fly ash, soot, etc., may also be employed; or a particulate sample taken directly from the environment. The core of the research of the invention is to research the reaction process on the particles under the illumination conditions of actual gaseous pollutants and humidity on the surface of the characterized particles.
It should be noted that the first filter 12 of the second reaction chamber may be made of different materials such as quartz, glass, metal, etc., and the first filter may not only serve as a seal, but also cut off and pass through different wavelengths of light, for example, quartz can pass through all ultraviolet light with a wavelength of 200nm or more, glass has a cut-off wavelength of about 350nm, and only light with a wavelength of 350nm or more passes through.
In order to study atmospheric gaseous pollutants and particulate matter under specific conditions, the first reaction chamber 14 of the reaction unit is a dark reaction chamber 7; the second reaction chamber is a light source irradiation reaction chamber 8; the third reaction chamber can be a blank control reaction chamber 9 (which can be adjusted according to the actual needs of the reaction); the first to third reaction chambers 14 to 14 are provided at their inlets and outlets with first to third valves 11 to 11 for adjusting air flow, respectively.
Specifically, when the reaction of gaseous pollutants and particulate matters under dark conditions and under specific light conditions needs to be studied, the first reaction chamber 14 is covered by a tin foil, and the first reaction chamber 14 is the dark reaction chamber 7; setting the second reaction chamber under a specific illumination condition, wherein the second reaction chamber is a light source to irradiate the reaction chamber 8; when the third reaction chamber is not filled with gas, the third reaction chamber is a blank control group; it should be noted that, in order to precisely control the flow of the gaseous pollutants entering the first reaction chamber 14 to the third reaction chamber, a first valve 11, a second valve and a third valve 11 for adjusting the flow of the gaseous pollutants are correspondingly arranged at the inlet and the outlet of the first reaction chamber 14 to the third reaction chamber; in addition, the light source includes a xenon lamp, an ultraviolet lamp, a halogen lamp, a deuterium lamp, an LED lamp, and the like, which are provided with a specific optical filter.
In order to research the atmospheric gaseous pollutants and particulate matters under the heavy pollution condition, the reaction unit further comprises a fourth reaction chamber with the same structure as the first reaction chamber 14, and the fourth reaction chamber is a heavy polluted air reaction chamber 10; the inlet and outlet of the fourth reaction chamber are provided with a fourth valve 11 for regulating the air flow.
Specifically, when heavy pollution weather is met, the content of gaseous pollutants and particulate matters in the atmosphere is obviously higher than usual, the sampling unit is utilized to filter the particulate matters in the heavy polluted air to obtain the gaseous pollutants, the gaseous pollutants are introduced into the heavy polluted air reaction chamber 10, a fourth objective table 3 is arranged in a fourth reaction chamber, a fourth hole groove is formed in the fourth objective table 3, a fourth particulate matter loading sheet is arranged in the fourth hole groove, and the fourth hole groove is used for fixing a third particulate matter loading sheet; gaseous pollutants react with the particles on the fourth particle loading sheet 4 to generate new particles, the residual gas after reaction is discharged through the adoption unit, and the sampling unit is used for detecting the gas flow rate and the accumulated flow.
It is emphasized that for the dark reaction chamber 7, the atmospheric gaseous reactants enter the dark reaction chamber 7 and interact with the particles therein, which alters the particle morphology to form new particles, which are analyzed by Transmission Electron Microscopy (TEM) and EDX spectroscopy.
For the light source reaction chamber, the light reaction can make the reaction on the particle surface more complicated, and the light reaction includes a series of processes such as excited state and free radical, but it is more close to actual environment, for example under the illumination condition particulate matter of iron and titanium can absorb the light and produce the light photocatalytic reaction for particulate matter surface activity becomes high, has more gaseous pollutant to be oxidized.
For the blank control reaction chamber 9, the particulate matter sample is also arranged in the blank group, but the air inlet valve 11 is closed, so that the continuous air inlet condition does not exist; the particle samples in the blank control reaction chamber 9 can be compared to the particle samples in the light source reaction chamber and the dark reaction chamber 7.
For better carrying of the particles, the first particle loading sheet is used for carrying the particles of minerals and metal oxides; the minerals and metal oxides are used for reacting with gaseous pollutants to generate new particles; wherein the first particulate matter loading glass is a copper mesh, a silicon wafer or glass; minerals and metal oxides include kaolin, calcite, quartz, aluminosilicates, real soil, fly ash and sandy soil samples and the like.
In order to convey the collected atmospheric gaseous pollutants from which the particulate matters are removed to the reaction unit, the sampling unit comprises a sampling pump 1 and a gas flow rate controller 2; the sampling pump 1 is used for pumping atmospheric gaseous pollutants and particulate matters into the reaction unit; the gas flow rate controller 2 is used to detect the instantaneous flow rate and the accumulated flow rate of the gas passing through the sampling pump 1.
In order to remove the particulate matters in the atmosphere, the sample introduction unit comprises a gas pipeline 6 and a particulate matter removing device 5, the particulate matter removing device 5 comprises a filter membrane, and the filter membrane is made of one of polytetrafluoroethylene, quartz and glass fibers. Specifically, the atmospheric gas enters the particulate matter removing device 5 through the gas pipeline 6, particulate matters in the atmospheric gas are removed to form atmospheric gaseous pollutants, the atmospheric gaseous pollutants are introduced into the corresponding reaction chambers through the sampling units, and the atmospheric gaseous pollutants and the particulate matters in the corresponding reaction chambers are subjected to corresponding reactions to generate new particulate matters.
The sampling pump 1 adopts one of a diaphragm pump, a piston pump or a rotary vane pump, and the sampling pump 1 introduces the sucked atmospheric gaseous pollutants into a corresponding reaction chamber, reacts the atmospheric gaseous pollutants and then enters the outside air through an outlet of the sampling pump 1.
In order to draw gas into the reaction unit at a constant flow rate, the unit is adapted to regulate the flow rate using a gas flow rate controller 2 such that gas is drawn into each reaction chamber at a set rate, wherein the gas flow rate controller 2 is one of a mass flow meter, a float flow meter or a restricted orifice.
Example 2
The embodiment discloses an in-situ detection method for atmospheric gaseous pollutants and particulate matters, which adopts the in-situ reaction device for the atmospheric gaseous pollutants and the particulate matters provided by the embodiment 1, and comprises the following steps:
s1, pumping the atmosphere into a reaction unit by using a sampling unit, and removing particles in the air by using the gas through a sample injection unit to form atmospheric gaseous pollutants;
s2, allowing atmospheric gaseous pollutants to enter a dark reaction chamber 7, a light source irradiation reaction chamber 8 and a heavily polluted air reaction chamber 10 respectively, and reacting with particles in the dark reaction chamber, the light source irradiation reaction chamber and the heavily polluted air reaction chamber to generate new particles; wherein the particles in the dark reaction chamber 7, the light source irradiation reaction chamber 8, the blank contrast reaction chamber 9 and the heavily polluted air reaction chamber are the same,
and S3, analyzing the different particles newly generated in the step S2 by respectively adopting a Transmission Electron Microscope (TEM) and an EDX spectrometer.
It should be noted that, in a Transmission Electron Microscope (TEM), fine structures smaller than 0.2um, which cannot be seen clearly under an optical microscope, can be seen; the EDX spectrometer is an important auxiliary matching instrument of an electron microscope (a scanning electron microscope and a transmission electron microscope), and can perform qualitative and quantitative analysis on element distribution of a microscopic region of a test material within 1-3 minutes by combining the electron microscope.
Compared with the existing detection method of the atmospheric gaseous pollutants, the in-situ reaction device of the atmospheric gaseous pollutants and the particulate matters can be directly connected with in-situ infrared, Raman, ultraviolet, fluorescence, optical microscope and other characterization means, so that the reaction process of the surface of the particulate matters is detected in real time; in the existing detection method, a sample is taken out after the reaction is finished, and offline analysis is performed by an electron microscope, XPS and the like, so that the reaction condition of the sample cannot be monitored in real time.
Example 3
In this embodiment, the in-situ reaction device for atmospheric gaseous pollutants and particulate matters provided in embodiment 1 and the in-situ detection method for atmospheric gaseous pollutants and particulate matters provided in embodiment 2 are used to perform reaction simulation and product detection on the atmospheric gaseous pollutants and the particulate matters, a particulate sample in each reaction chamber of the reaction unit in this embodiment is fly ash, a detection result of newly generated particulate matters is shown in fig. 3, a blank control result is shown in fig. 4, and the specific steps are as follows:
s1, removing particulate matters in an atmospheric sample by using a gas pipeline 6 and a particulate matter removing device 5, introducing generated atmospheric gaseous pollutants into a light source irradiation reaction chamber 8 through a sampling pump 1, wherein the particles in the light source irradiation reaction chamber and the particles in a blank control reaction chamber 9 are the same, but closing an air inlet valve 11 of the blank control reaction chamber 9, and setting continuous air inlet conditions for the blank control reaction chamber 9; the atmospheric gaseous pollutants react with the fly ash, which is a particle sample in the light source irradiation reaction chamber 8, to generate new particles;
and S3, analyzing the new particles generated in the step S2 by using a Transmission Electron Microscope (TEM) and an EDX spectrometer.
It should be noted that, in this embodiment, the light source irradiation reaction chamber 8 adopts sunlight irradiation, and new particulate matters generated by the sunlight irradiation and particulate matter samples in the blank control reaction chamber 9 are characterized and analyzed; for example, the EDS test is adopted to characterize and test the elements, and the results and the mass fraction ratio of each element are analyzed to obtain the following results:
by testing the new particles in the sunlight irradiation reaction chamber, the mass percentage of the S element is detected to be 3.52% (fig. 3), and the mass percentage of the S element in the particle sample in the blank control reaction chamber 9 is detected to be 0.53% (fig. 4), which indicates that sulfate is generated by the action of the sulfur-containing gas pollutant and the fly ash, namely, the phenomenon of S element enrichment in the atmospheric gaseous pollutant is proved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. An in-situ reaction device for atmospheric gaseous pollutants and particulate matters is characterized by comprising a sample introduction unit, a reaction unit and a sampling unit which are sequentially connected, wherein the sample introduction unit is used for introducing samples of the atmospheric gaseous pollutants and the particulate matters; the sample introduction unit comprises a gas pipeline and a particulate matter removing device, the particulate matter removing device comprises a filter membrane, and the filter membrane is made of one of polytetrafluoroethylene, quartz and glass fiber;
the reaction unit comprises a first reaction chamber, a second reaction chamber and a third reaction chamber which have the same structure; a first objective table is arranged in the first reaction chamber, a first hole groove is formed in the first objective table, and the first hole groove is used for fixing a first particulate matter loading sheet; a second objective table is arranged in the second reaction chamber, a second hole groove is formed in the second objective table, a second particulate matter loading sheet is arranged in the second hole groove, and the second hole groove is also used for fixing the second particulate matter loading sheet; a third object carrying table is arranged in the third reaction chamber, a third hole groove is formed in the third object carrying table, a third particle loading sheet is arranged in the third hole groove, and the third hole groove is also used for fixing the third particle loading sheet;
the first reaction chamber is provided with a first optical filter, and the first optical filter is used for sealing the first reaction chamber and cutting off and passing different wavelengths of light;
the sampling unit is used for detecting the gas flow rate and the accumulated flow;
the first reaction chamber is a dark reaction chamber; the second reaction chamber is a light source irradiation reaction chamber; the third reaction chamber is a blank control reaction chamber;
the inlets and outlets of the first reaction chamber, the second reaction chamber and the third reaction chamber are correspondingly provided with a first valve, a second valve and a third valve which are used for adjusting the flow of gaseous pollutants;
the light source comprises a xenon lamp, an ultraviolet lamp tube, a halogen lamp, a deuterium lamp, an LED lamp and sunlight;
the reaction unit also comprises a fourth reaction chamber, and the fourth reaction chamber is a heavily polluted air reaction chamber; the inlet and the outlet of the fourth reaction chamber are respectively provided with a fourth valve for regulating the air flow; a fourth objective table is arranged in the fourth reaction chamber, a fourth hole groove is formed in the fourth objective table, a fourth particulate matter loading sheet is arranged in the fourth hole groove, and the fourth hole groove is used for fixing the fourth particulate matter loading sheet;
the first particle loading sheet is used for loading particles of minerals and metal oxides; the particles of minerals and metal oxides are used to react with gaseous pollutants and generate new particles;
the sampling unit comprises a sampling pump and a gas flow rate controller; the sampling pump is used for pumping atmospheric gaseous pollutants and particulate matters into the reaction unit;
the gas flow rate controller is used for detecting the instantaneous flow rate and the accumulated flow of the gas passing through the sampling pump.
2. The in-situ reaction device for atmospheric gaseous pollutants and particulate matters as claimed in claim 1, wherein the first particulate matter loading sheet is a copper mesh, a silicon wafer or glass.
3. The in-situ atmospheric gaseous pollutant and particulate matter reaction device of claim 1, wherein the gas flow rate controller is one of a mass flow meter, a float flow meter or a restricted orifice.
4. An in-situ detection method for atmospheric gaseous pollutants and particulate matters, which is characterized in that the in-situ reaction device for the atmospheric gaseous pollutants and the particulate matters as claimed in any one of claims 1 to 3 is adopted, and the in-situ detection method comprises the following steps:
s1, pumping gas into a reaction unit by using a sampling unit, and removing particles in the air to form gaseous pollutants after the gas passes through a sample injection unit;
s2, introducing gaseous pollutants into the dark reaction chamber and the light source irradiation reaction chamber, reacting with the particles in the dark reaction chamber and the light source irradiation reaction chamber to generate new particles, wherein the particles identical to the dark reaction chamber and the light source irradiation reaction chamber are arranged in the blank control reaction chamber; simultaneously, introducing atmospheric gaseous pollutants into a heavily-polluted air reaction chamber, wherein the particulate matters in the heavily-polluted air reaction chamber are the same as those in the dark reaction chamber and the blank control reaction chamber;
and S3, characterizing and analyzing the newly generated particles in the light source irradiation reaction chamber and the dark reaction chamber by adopting a Transmission Electron Microscope (TEM) and an EDX spectrometer respectively.
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| CN107064420B (en) * | 2017-02-14 | 2023-11-28 | 中国科学院化学研究所 | Online monitoring system and method for medium-volatile organic compounds in atmosphere |
| CN109506992B (en) * | 2018-11-24 | 2021-06-29 | 天津大学 | Sampling device and sampling method for collecting large amount of atmospheric gaseous mercury in short term |
| CN109813671A (en) * | 2019-03-18 | 2019-05-28 | 新疆维吾尔自治区环境保护科学研究院 | Gas/grain reaction detection system |
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| CN2469329Y (en) * | 2000-11-06 | 2002-01-02 | 李清洋 | Umbrella shaped apparatus used for treatment of smoke pollution |
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