CN210639059U - Atmospheric aerosol on-line monitoring system - Google Patents
Atmospheric aerosol on-line monitoring system Download PDFInfo
- Publication number
- CN210639059U CN210639059U CN201921413668.3U CN201921413668U CN210639059U CN 210639059 U CN210639059 U CN 210639059U CN 201921413668 U CN201921413668 U CN 201921413668U CN 210639059 U CN210639059 U CN 210639059U
- Authority
- CN
- China
- Prior art keywords
- sample
- total organic
- organic carbon
- liquefier
- monitoring system
- 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
Images
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model discloses an atmospheric aerosol on-line monitoring system belongs to environmental monitoring technical field. Comprises PM connected in sequence through connecting pipelines2.5The device comprises a cutting head, a drying device, an air sample liquefier, an EEM synchronous absorption-three-dimensional fluorescence spectrometer, a sample injection pump, a sample collection device and a total organic carbon tester; the EEM synchronous absorption-three-dimensional fluorescence spectrometer, the sample injection pump and the total organic carbon tester are connected with a data processing system, the total organic carbon tester is connected with a relay, an air sample liquefier and a sample collection deviceThe pure water storage device is connected with the connecting pipeline, so that the collected real-time atmospheric samples are richer, guiding data contribution is made for the explanation of more environmental factors, complete data support is provided for the conversion relation among chromophores and the like, various problems in the atmospheric environment can be better explained, and richer explanation is made for monitoring and observation.
Description
Technical Field
The utility model belongs to the technical field of environmental monitoring, concretely relates to atmospheric aerosol on-line monitoring system.
Background
Following PM in the atmosphere2.5The pollution caused by the increase of particulate matter is also increasing day by day, and the most significant environmental impact is the frequent occurrence of haze weather, which can lead to reduced visibility. Taking into account PM2.5The types and the content of the carried components can also change along with seasons, special weather (such as rainfall and sand dust) or accidental events, and the research necessity is particularly outstanding. In PM2.5In general, the components which are fluorescent are essential for the identification: once they have light absorption, they have certain induction factors for environmental problems such as greenhouse effect and the like to different degrees; secondly, some chromophore substances have toxicity (such as PAHs), and the standard spectrum of the substance has the appearance of fluorescence chromophore, the substance has harm to the environment, and the fluorescence property of the substance has certain influence on the environment, and in the actual PM2.5The chromophore of the sample has the appearance of a similar PAHs fluorescent substance, so that the sample has high research value on whether the PAHs fluorescent substance can cause harm to human bodies.
The optical method in the prior art is the most widely applied method at present, wherein the absorption spectrum range measured by using an off-line filter membrane-solvent extraction-continuous spectrum analysis method is wider than that measured on line, the limitation of single wavelength can be reduced, and a wavelength band (less than 400nm) which can better represent the light absorption characteristic of brown carbon is provided and is adopted more, and the basic principle is as follows: extracting soluble components from the particulate matter with water or methanol, and measuring attenuation of light (ATN) after the light passes through the extractive solution by means of broadband (such as UV-Vis) spectrometer.
However, the technology for monitoring the change of Brown Carbon (BrC) chromophore in aerosol on line at present is not related, and the prior technical means mainly tests the absorbance on line. BrC is a yellow or yellowish-brown organic substance which absorbs light in the near ultraviolet (300-400nm) and part of the short-wave visible region. The strong light absorption capability of the BrC in the near ultraviolet region is caused by the existence of a chromophore, a conjugated system or an aromatic system in the inner molecule of the BrC; the reason why BrC has light absorption capability in part of the short-wave visible region is that the conjugated bond energy of BrC is low, for example, polycyclic aromatic hydrocarbon also has light absorption capability in part of the short-wave visible region. The absorbance test has certain limitations, and carbon black, dust and mineral particles also absorb light in the atmosphere, so that further research should be carried out on the mineral dust to better solve the optical characteristics of the aerosols and the contribution of the mineral dust to radiation forcing in a state of being mixed with the organic aerosols. The fluorescent characteristic of BrC is more obvious, and the fluorescence technology has been widely applied to the analysis of dissolved organic matters, marine and terrestrial humoid compounds and bioaerosols, and the sensitivity and uniqueness of the fluorescence technology are another important reason for selecting the same. Excited Emission Matrix (EEM) fluorescence technology-is widely used in coastal environments to distinguish between foreign and local water-soluble Organic (OM) resources. Kieber et al identified that brown carbon in the rain had undergone significant bleaching reaction under the illumination conditions by EEM spectroscopy, and found that the long-wavelength band excited chromophore was decomposed into two types of chromophores of short-wavelength excitation and long/short-wavelength emission, which indicates that EEM method can dynamically react the chromophore type conversion process. Although many studies have been made to explore the atmospheric chemical reaction process by the EEM method, since fluorescent compounds tend to have the same characteristics, the compounds found in brown carbon aerosol have high conjugation, and the fluorescent method does not directly classify brown carbon as absorption spectroscopy, but has high detection sensitivity. The similarity of atmospheric aerosol chromophores cannot be systematically distinguished, on the basis, the tracing of fluorescent substance chromophores in the aerosol is particularly important, and the application expansion of the EEM method in the atmospheric field is better for tracing the chromophores of the fluorescent substances in the aerosol.
At present, more samples are applied to an off-line means, the amount of the samples of the off-line means becomes a key for characterization, but the off-line samples are collected only one time, the obtained amount does not occupy an advantage, chromophore information obtained along with the time and the change of weather conditions under some special weather conditions cannot be distinguished, and the difference of atmospheric chemical reactions cannot be known.
Disclosure of Invention
In order to solve the defects existing in the prior art, the utility model aims to provide an atmospheric aerosol on-line monitoring system, this system structural design is reasonable, has realized in the atmosphere that brown carbon and chromophore disappear with time and change on-line monitoring.
The utility model discloses a realize through following technical scheme:
the utility model discloses an atmospheric aerosol on-line monitoring system, include the PM that connects gradually through connecting tube2.5The device comprises a cutting head, a drying device, an air sample liquefier, an EEM synchronous absorption-three-dimensional fluorescence spectrometer, a sample injection pump, a sample collection device and a total organic carbon tester;
the EEM synchronous absorption-three-dimensional fluorescence spectrometer, the sample injection pump and the total organic carbon tester are connected with a data processing system, the total organic carbon tester is connected with a relay for controlling the operation time of the total organic carbon tester, and the air sample liquefier and the sample collection device are connected with a pure water storage device through a connecting pipeline.
Preferably, the drying device is a transparent cylindrical container, silica gel is filled at two ends inside the drying device, and activated carbon is filled between the silica gel at two ends inside the drying device.
Preferably, a first water inlet pump is connected between the air sample liquefier and the pure water storage device.
Preferably, a second water inlet pump is connected between the sample collection device and the pure water storage device.
Preferably, the air sample liquefier is connected to a waste liquid barrel, which is connected to the total organic carbon tester.
Preferably, the connecting line is a PTFE tube.
Preferably, PEEK joints are arranged at the joints of the connecting pipeline, the air sample liquefier, the EEM synchronous absorption-three-dimensional fluorescence spectrometer, the sample injection pump and the total organic carbon tester.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses an atmospheric aerosol on-line monitoring system, including EEM synchronous absorption-three-dimensional fluorescence spectrum appearance that is used for detecting chromophore and the total organic carbon tester that is used for detecting carbon content, make the real-time atmospheric sample's of gathering abundanter, not only make ultraviolet visible spectrum and chromophore's dynamic capture more meticulous, and the change of discovery chromophore under the influence of different weather factors that can be better in the appearance of on-line system, the complete change trend who observes a weather change under the chromophore, instructive data contribution has been made for the explanation of more environmental factors, also give more complete data support for the conversion relation between the chromophore etc. more, can explain the multiple problem under the environment better, make abundanter explanation for monitoring and observation.
Under the prior art system, the method for understanding the atmospheric brown carbon is single, the appearance of the brown carbon can only be researched by an ultraviolet visible technology, the introduction of the chromophore shows the mode and the change trend of atmospheric chemical reaction, the introduction of the chromophore has a better explanation effect on revealing the atmospheric brown carbon aerosol source and the environmental problems caused by abundant chemical reaction processes, the novel dimension of the research on the atmospheric brown carbon and the atmospheric brown carbon is realized, the cause transformation of pollutants is analyzed in multiple aspects, and the occurrence of various reactions is researched and explained. At present, more researches are applied and depend on an off-line means, and the sample amount of the off-line means becomes a key for characterization and transformation; however, the current off-line samples are collected only one time, the obtained quantity does not occupy an advantage, chromophore information obtained in some special weather conditions along with the time and the change of the weather conditions cannot be distinguished, and the difference between the atmospheric chemical reaction and the change cannot be known. The system can give a relatively complete explanation through dynamic capture through online monitoring; and the quantity of the samples can be controlled by an experimenter so as to obtain different data under different resolutions, so that the change of the atmospheric chemical reaction has dynamic capturing property.
Furthermore, the drying device adopts a transparent cylindrical container, so that an atmospheric sample entering the drying device can uniformly flow through the drying device, the silica gel and the activated carbon at the inlet end can adsorb moisture and VOCs interference, and the silica gel at the outlet end can observe the color change through the transparent container wall while adsorbing the moisture to prompt whether the silica gel and the activated carbon in the drying device need to be replaced.
Furthermore, a first water inlet pump is connected between the air sample liquefier and the pure water storage device, a second water inlet pump is connected between the sample collecting device and the pure water storage device, the automatic and accurate control of the water inflow can be realized, and the automation degree of the system and the accuracy of data are improved.
Further, the air sample liquefier is connected with the waste liquid bucket, can pass through the peristaltic pump that the air sample liquefier was taken certainly and pump to the waste liquid bucket with unnecessary sample, and the sample that total organic carbon tester tested can also be discharged to the waste liquid bucket and carry out unified processing.
Furthermore, a connecting pipeline in the system adopts a PTFE pipe, so that the fluorescent pollution is prevented.
Furthermore, the joint for connecting the pipeline and each instrument adopts a PEEK joint, the PEEK joint can be used for remarkably finding out the generation of no fluorescent pollution, and the PEEK joint has good sealing performance and convenience, can expand the length of the whole pipeline and is convenient to use in different purposes.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic structural view of the drying device of the present invention;
fig. 3 is a data diagram obtained by EEM and TOC in the system of the present invention.
In the figure: 1 is PM2.5The device comprises a cutting head, a drying device, an air sample liquefier, a waste liquid barrel, an EEM synchronous absorption-three-dimensional fluorescence spectrometer, a sample injection pump, a sample collection device, a total organic carbon tester, a data processing system, a relay, a pure water storage device, a first water inlet pump and a second water inlet pump, wherein the drying device is 2, the air sample liquefier is 3, the waste liquid barrel is 4, the EEM synchronous absorption-three-dimensional fluorescence spectrometer is 5, the sample injection pump is 6, the sample collection device is 7, the total organic carbon tester is.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention:
as shown in fig. 1, an atmosphere of the present inventionAn aerosol on-line monitoring system comprises PM connected in sequence through PTFE tubes2.5The device comprises a cutting head 1, a drying device 2, an air sample liquefier 3, an EEM synchronous absorption-three-dimensional fluorescence spectrometer 5, a sample injection pump 6, a sample collection device 7 and a total organic carbon tester 8; the EEM synchronous absorption-three-dimensional fluorescence spectrometer 5 and the total organic carbon tester 8 are connected with a data processing system 9, and the data processing system 9 can adopt a computer to store and analyze data; the total organic carbon tester 8 is connected with a relay 10 for controlling the running time of the total organic carbon tester 8, and the air sample liquefier 3 and the sample collecting device 7 are connected with a pure water storage device 11 through a connecting pipeline. A first water inlet pump 12 is connected between the air sample liquefier 3 and the pure water storage device 11. A second water inlet pump 13 is connected between the sample collecting device 7 and the pure water storage device 11. The air sample liquefier 3 is connected with a waste liquid barrel 4, and the waste liquid barrel 4 is connected with a total organic carbon tester 8.
As shown in fig. 2, the drying device 2 is a transparent cylindrical container, silica gel is filled at two ends inside the drying device 2, and activated carbon is filled between the silica gel at two ends inside the drying device 2. The existing silica gel column can be adopted, and the middle section is filled with active carbon.
The connecting pipeline is connected with the air sample liquefier 3, the EEM synchronous absorption-three-dimensional fluorescence spectrometer 5, the sample injection pump 6 and the total organic carbon tester 8 through PEEK joints. The PEEK head has good conductivity, does not generate redundant fluorescent pollution, and is suitable for the application requirement of the circuit.
The connection and operation method of the online monitoring system for atmospheric aerosol according to the present invention is further explained by a specific embodiment as follows:
the liquid flow rate of the whole system is controlled by using a liquid chromatograph sample injection pump (Wufeng instrument) and the liquid is drifted towards the PILS-WSOC (Mentrohm, PILS)TMAir sample liquefier) system an EEM simultaneous absorption-three-dimensional fluorescence spectrometer (Horiba,
-ourt compact, bench Fluorometer for CDOM, hereinafter EEM), absorption of water-soluble aerosol componentsThe spectra and chromophores as well as the carbon mass were measured semi-continuously. Through steam condensation-liquid drop impact collection. The integrated circuit was connected by a bubble removal device and a sample pump (IMI NORGREN) in the PILS-WSOC using a liquid chromatography capillary of one sixteenth diameter, and the liquid was flowed into a sample bottle for TOC (GE Analytical Instruments, Sievers M9 TOC analyzer, portable, hereinafter referred to as TOC) monitoring.
In the front position of the PILS, a PM2.5 cutting head 1 is used to collect aerosols from the atmosphere, a silica gel column filled with activated carbon is used as a drying device 2 to remove moisture from the collected particulate matter, a pre-programmed peristaltic pump is used to supply the liquefied sample of the PILS to the EEM for analysis, and the ultra-pure water sample is tested alone in a loop to provide a background sample of pure water, ensuring that the collection and analysis of the ultra-pure water used in the system does not cause water-soluble organic contaminants, less the interference of the pure water blank thereof on the system. The method comprises the steps of analyzing for a certain analyzing time based on an EEM system, collecting a liquefied atmospheric sample by utilizing a vacant columnar position in a degassing bubble device behind a PILS-WSOC instrument pipeline, filling the sample into a flow cell of the EEM system at regular time through a peristaltic pump for waiting for sample monitoring, filling the detected sample into a sample bottle of a TOC monitoring device through the control of another peristaltic pump, filling a fixed amount of 15mL ultrapure water diluted sample into the sample bottle at a specified time, waiting for TOC sampling and detecting.
The operation flow of the pre-experiment is as follows, after the sampling pump of the liquid chromatograph is calibrated, the ultrapure water prepared in advance is transmitted to the PILS-WSOC through the sampling pump of the liquid chromatograph, the flow rate of the sampling pump of the liquid chromatograph is controlled at 1.5mL/min, the time for generating the sample by liquefying the PILS-WSOC is repeatedly adjusted, the sample at the sample collecting position is determined to be 100s, the sample is pumped once through a peristaltic pump and enters a special cuvette of the EEM flow cell through a PTFE tubule, the sample is pumped once every 100s and is pumped six times in ten minutes, the peristaltic pump is controlled to stop working for 5min, and the EEM monitoring is carried out on the sample in the cuvette within the five minutes. One cycle measurement time was 15min, 4 cycles per hour. At 5min intervals, the excess sample is accumulated at the sample collection position of the degassing bubble device, the capacity of the sample collection position reaches the load, and the sample flows into a waste liquid bottle from the degassing bubble tube
Effect verification:
as shown in fig. 3, the sum of the resulting contents of the five chromophores analyzed by EEM resulted in the total chromophore content and the real-time variation trend, which was compared with the actually monitored WSOC data in PM2.5, and the appearance of the peak in the two trend lines was found to be consistent. But irregular changes occur under a number of different environmental conditions, as shown by the plot labeled position 2, which appears to be within 5 months, 5 days 03 in 2018: 00-20: 00, in a continuous process of sand dust-strong sand dust-precipitation appearing within 17 hours, the WSOC content is increased and the EEM content is suddenly reduced in the sand dust-strong sand dust process within 13 hours, and then the precipitation process appears within 4 hours, and the trends of the WSOC content and the EEM content tend to be consistent, so that the different trends of the chromophore content of EEM and the WSOC in PM2.5 under the two different meteorological conditions can be seen, which shows that when the sand dust process appears, part of water-soluble substances causing pollution have no fluorescence characteristic. The concentration change of various pollutants under part of special weather conditions provides some evidences for explaining the generation and elimination change of the chromophore. As shown in the figure, the mark position 1 shows that the real-time PM2.5 concentration issued by provincial station is compared with the tested EEM content, and we see that the PM2.5 content is reduced, the WSOC and EEM concentration content is increased, and the NO2 concentration monitored by provincial station is obviously reduced at the time, which has a great relationship with the generation of secondary sources, and we can see that the reliability of the online system can be verified from such several examples.
The above description is only a part of the embodiments of the present invention, and the specific operations can be changed according to the field conditions, it must be understood that various other modifications and embodiments can be devised by those skilled in the art, and the above parameters are only descriptions for facilitating the understanding of those skilled in the art, and those skilled in the art can understand that when the model of the device and the parameters are changed, the model selection of the device and the adjustment of the parameters can be performed according to the principles of the present invention.
Claims (7)
1. An on-line monitoring system for atmospheric aerosol, which is characterized in thatComprises PM connected in sequence by a connecting pipeline2.5The device comprises a cutting head (1), a drying device (2), an air sample liquefier (3), an EEM synchronous absorption-three-dimensional fluorescence spectrometer (5), a sample injection pump (6), a sample collection device (7) and a total organic carbon tester (8);
EEM synchronous absorption-three-dimensional fluorescence spectrum appearance (5), sampling pump (6) and total organic carbon tester (8) are connected with data processing system (9), and total organic carbon tester (8) are connected with relay (10) that are used for controlling total organic carbon tester (8) operating time, and air sample liquefier (3) and collection sample device (7) are connected with pure water storage device (11) through the connecting tube.
2. An online atmospheric aerosol monitoring system according to claim 1, wherein the drying device (2) is a transparent cylindrical container, silica gel is filled in the drying device (2) at two ends, and activated carbon is filled between the silica gel at two ends in the drying device (2).
3. An on-line atmospheric aerosol monitoring system according to claim 1, characterized in that a first water inlet pump (12) is connected between the air sample liquefier (3) and the pure water storage device (11).
4. An on-line atmospheric aerosol monitoring system according to claim 1, characterized in that a second water inlet pump (13) is connected between the sample collection device (7) and the pure water storage device (11).
5. An on-line atmospheric aerosol monitoring system according to claim 1, wherein the air sample liquefier (3) is connected to a waste liquid tank (4), and the waste liquid tank (4) is connected to the total organic carbon tester (8).
6. An online atmospheric aerosol monitoring system according to claim 1, wherein the connecting line is a PTFE tube.
7. The atmospheric aerosol on-line monitoring system of claim 1, wherein PEEK joints are arranged at the joints of the connecting pipeline and the air sample liquefier (3), the EEM synchronous absorption-three-dimensional fluorescence spectrometer (5), the sample injection pump (6) and the total organic carbon tester (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921413668.3U CN210639059U (en) | 2019-08-28 | 2019-08-28 | Atmospheric aerosol on-line monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921413668.3U CN210639059U (en) | 2019-08-28 | 2019-08-28 | Atmospheric aerosol on-line monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210639059U true CN210639059U (en) | 2020-05-29 |
Family
ID=70797299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921413668.3U Active CN210639059U (en) | 2019-08-28 | 2019-08-28 | Atmospheric aerosol on-line monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210639059U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686743A (en) * | 2021-08-19 | 2021-11-23 | 天津大学 | On-line monitoring and analyzing device for atmospheric aerosol |
-
2019
- 2019-08-28 CN CN201921413668.3U patent/CN210639059U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686743A (en) * | 2021-08-19 | 2021-11-23 | 天津大学 | On-line monitoring and analyzing device for atmospheric aerosol |
| CN113686743B (en) * | 2021-08-19 | 2022-08-02 | 天津大学 | On-line monitoring and analyzing device for atmospheric aerosol |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105181343B (en) | Suitable for the simple vehicle-mounted emission test method of the heavy-duty car equipped with OBD | |
| CN100529733C (en) | Non-contact COD/DOC water quality on-line monitoring method and device by spectrum method | |
| CN107167450A (en) | Gas in Oil of Transformer and micro- water on-line detecting system | |
| CN104849374A (en) | Non-methane hydrocarbon analysis equipment and method | |
| CN106546550A (en) | Tail gas discharge measuring method and device under the actual riving condition of vehicle | |
| CN104614337A (en) | Portable multi-component mixed gas monitoring system | |
| CN109444070A (en) | Oil content all automatic measurement instrument in water | |
| CN111982611B (en) | Online detection device and detection method for ammonia in flue gas | |
| CN103616484B (en) | Monitoring method of persistent organic pollutants in atmospheric particulates based on particulate continuous monitor | |
| CN106596439A (en) | Apparatus and method for simultaneously measuring nitrous acid, ozone and nitrogen dioxide in air | |
| CN210639059U (en) | Atmospheric aerosol on-line monitoring system | |
| CN107643261A (en) | A kind of monitor of long light path White pond DOAS methods measurement dusty gas concentration | |
| CN201307092Y (en) | A ultraviolet absorption method portable stack gas, auto car tail gas measuring apparatus | |
| CN203011840U (en) | Biological comprehensive toxicity detection device | |
| CN203941099U (en) | Gas phase molecular absorption spectrometer with on-line oxidation device | |
| CN101308088A (en) | System and method for measuring chemical fertilizer volatile gas | |
| CN110146458A (en) | A kind of atmosphere solubility brown carbon on-line detecting system and detection method | |
| CN204731209U (en) | NMHC analytical equipment | |
| CN110687023A (en) | Double-channel online particulate matter monitor | |
| Buttini et al. | Coupling of denuder and ion chromatographic techniques for NO2 trace level determination in air | |
| Schnegg et al. | Online field fluorometers for hydrogeological tracer tests | |
| CN206515230U (en) | It is a kind of at the same measure air in nitrous acid, ozone, the equipment of nitrogen dioxide | |
| CN206832780U (en) | A kind of wasted nickel catalyst device | |
| Wu et al. | Development, characterization, and application of an improved online reactive oxygen species analyzer based on the Monitor for AeRosols and Gases in ambient Air (MARGA) | |
| CN205504126U (en) | Tee bend valve control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |