阅读说明：本技术 高效自清洁在线测量大气颗粒物中活性氧自由基的系统 (System for active oxygen free radical in high-efficient automatically cleaning on-line measurement atmospheric particulates ) 是由 陈魁 楚志刚 薛丰昌 苗春生 周可 詹少伟 张越 于 2019-08-16 设计创作，主要内容包括：本发明公开了一种高效自清洁在线测量大气颗粒物中活性氧自由基的系统,包括在线收集大气颗粒物部件、荧光测量仪和排气组件；在线收集大气颗粒物部件包括颗粒物增长室、蒸汽发生器、蒸汽喷管、若干个液体冷却管和旋风收集器；大气样品与水蒸气在颗粒物增长室的进气口处混合；颗粒物增长室的内壁涂覆有氧化铈改性纳米疏水涂层；旋风收集器的入口与颗粒物增长室的出口连通；旋风收集器的入口内设有荧光测定液进口；混合物在旋风收集器中被分离为气体和采集液；气体经排气组件排出；采集液从旋风收集器的出液口排出,荧光测量仪检测采集液,得到采集液中的大气颗粒物中活性氧自由基浓度。本发明具有高效、自清洁、准确等优点。(The invention discloses a system for efficiently and automatically cleaning active oxygen free radicals in online measurement of atmospheric particulates, which comprises an atmospheric particulate on-line collecting component, a fluorescence measuring instrument and an exhaust assembly, wherein the atmospheric particulate on-line collecting component is connected with the fluorescence measuring instrument; the on-line atmospheric particulate collecting component comprises a particulate growing chamber, a steam generator, a steam spray pipe, a plurality of liquid cooling pipes and a cyclone collector; mixing an atmospheric sample and water vapor at an air inlet of the particulate matter growth chamber; the inner wall of the particle increasing chamber is coated with a cerium oxide modified nano hydrophobic coating; the inlet of the cyclone collector is communicated with the outlet of the particle increasing chamber; a fluorescence measuring liquid inlet is arranged in the inlet of the cyclone collector; the mixture is separated into gas and collection liquid in a cyclone collector; the gas is exhausted through the exhaust assembly; and discharging the collected liquid from a liquid outlet of the cyclone collector, and detecting the collected liquid by a fluorescence measuring instrument to obtain the concentration of active oxygen radicals in atmospheric particulates in the collected liquid. The invention has the advantages of high efficiency, self-cleaning, accuracy and the like.)

1. The utility model provides a system for active oxygen free radical in high-efficient automatically cleaning on-line measurement atmospheric particulates which characterized in that:

The device comprises an on-line atmospheric particulate matter collecting component, a fluorescence measuring instrument and an exhaust assembly;

the on-line atmospheric particulate collecting component comprises a particulate growing chamber, a steam generator, a steam spray pipe, a plurality of liquid cooling pipes and a cyclone collector;

The particle increasing chamber is provided with an air inlet, and the atmospheric sample enters the particle increasing chamber from the air inlet of the particle increasing chamber;

The steam generator generates steam, the steam spray pipe is arranged in the air inlet of the particle increasing chamber, and the steam generated by the steam generator is sprayed into the particle increasing chamber through the steam spray pipe;

the liquid cooling pipe is arranged on the outer side of the particle increasing chamber, and cooling liquid flows in the liquid cooling pipe to reduce the temperature of the particle increasing chamber;

the atmospheric sample and the water vapor are mixed at the air inlet of the particle increasing chamber, and the atmospheric particles in the atmospheric sample absorb moisture, grow and dissolve in water in the process of flowing from the air inlet to the outlet of the particle increasing chamber;

The inner wall of the particle increasing chamber is coated with a cerium oxide modified nano hydrophobic coating;

The inlet of the cyclone collector is communicated with the outlet of the particle increasing chamber, and atmospheric particle liquid and gas which absorb moisture and increase and are dissolved in water enter the cyclone collector;

A fluorescence measuring liquid inlet is formed in an inlet of the cyclone collector, and fluorescence measuring liquid enters the cyclone collector from the fluorescence measuring liquid inlet;

Atmospheric particulate matter liquid and gas which absorb moisture and grow and are dissolved in water are mixed with fluorescence measuring liquid at an inlet of a cyclone collector, and the mixture is separated into gas and collecting liquid in the cyclone collector;

the gas is exhausted from a gas outlet of the cyclone collector through the exhaust assembly, the exhaust assembly comprises a gas pump, and the gas pump provides power for an atmospheric sample to enter the particle growth chamber;

and the collected liquid is discharged from a liquid outlet of the cyclone collector, and the fluorescence measuring instrument detects the collected liquid to obtain the concentration of active oxygen radicals in atmospheric particulate matters in the collected liquid.

2. The system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

The cerium oxide modified nano hydrophobic coating is prepared from the following components in percentage by mass: 45.11% of epoxy resin, 13.53% of dimethylbenzene, 9.67% of n-butanol, 1.40% of nano cerium oxide, 1.93% of nano silicon oxide, 27.07% of polyamide and 1.29% of dispersing agent.

3. The system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

The device also comprises a bubble remover, a peristaltic pump for measuring waste liquid and a waste liquid storage tank;

The bubble remover, the fluorescence measuring instrument, the measuring waste liquid peristaltic pump and the waste liquid storage tank are sequentially arranged along the flowing direction of the collecting liquid;

The bubble remover is communicated with a liquid outlet of the cyclone collector through a pipeline, and the bubble remover removes foams in the collected liquid;

The fluorescence measuring instrument detects the concentration of active oxygen free radicals in atmospheric particulates in the collection liquid;

the peristaltic pump for measuring the waste liquid provides power for the collected liquid to be discharged into the waste liquid storage tank;

And the waste liquid storage tank stores the detected collection liquid.

4. the system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 3, wherein:

the liquid cooling device is characterized by further comprising a waste liquid peristaltic pump, wherein the waste liquid peristaltic pump is arranged between the liquid cooling pipe and the waste liquid storage tank along the flowing direction of cooling liquid, and liquid in the liquid cooling pipe is discharged into the waste liquid storage tank after being cooled.

5. The system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

the gas pump is arranged in the gas pump and comprises a gas pump body, a gas exhaust assembly and a liquid remover, wherein the gas exhaust assembly further comprises a liquid remover and an adjusting needle valve;

The liquid remover is communicated with the gas outlet of the cyclone collector through a pipeline, and the liquid remover removes liquid in gas;

And the regulating needle valve controls the sample introduction flow of the atmospheric sample.

6. the system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

Wherein the fluorescence measuring instrument detects the concentration of active oxygen radicals by the following formula:

C _ROS is the concentration of reactive oxygen species in the atmospheric particulates, FR is the response of the fluorometer in unitless counts, CF is the calibration coefficient calculated from the calibration curve, Q _ls is the flow rate of the liquid sample, and Q _A is the flow rate of the atmospheric sample.

7. the system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

wherein the steam generator is annularly arranged on the outer periphery of the air inlet of the particle growing chamber.

8. The system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

Wherein the inlet of the cyclone collector is directly communicated with the outlet of the particle growing chamber.

9. the system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

The device also comprises a fluorescent agent measuring liquid peristaltic pump and a fluorescent measuring liquid storage tank;

the fluorescence determination liquid storage tank stores fluorescence determination liquid, and the fluorescence determination liquid is conveyed into the inlet of the cyclone collector through the fluorescence determination liquid peristaltic pump from the fluorescence determination liquid inlet.

10. the system for efficient self-cleaning online measurement of reactive oxygen species in atmospheric particulates according to claim 1, wherein:

The device also comprises a water supply peristaltic pump and a water supply storage tank;

The water supply storage tank stores ultrapure water, and the ultrapure water is conveyed into the steam generator through the water supply peristaltic pump.

Technical Field

The invention belongs to the field of environmental protection measurement, relates to a system for online measuring active oxygen free radicals in atmospheric particulates, and particularly relates to a system for efficiently and automatically cleaning active oxygen free radicals in atmospheric particulates.

Background

the atmospheric particulate matter can be divided into PM10, PM2.5 and PM1.0 according to particle size, wherein the particle size of the particulate matter is smaller than 2.5 microns, and the particulate matter is called inhalable particulate matter which is closely related to human health because the particle size is small and the inhalable particulate matter can easily enter the respiratory tract of a human body. In recent 20 years, a large number of scholars successively use a free radical theory to discuss the pathogenic effect of the particulate matters, detect that free radicals and free radical reactions exist in the particulate matters, and discover that the free radicals play a crucial role in the toxic effect of the particulate matters through a large number of in vivo and in vitro experiments. Today, oxidative damage by free radicals is considered to be one of the important mechanisms of biological activity by particulate matter.

In the research of the relationship between active oxygen radicals and atmospheric particulates, researchers find that the active oxygen radicals play an important role in the pathogenicity of the atmospheric particulates, and believe that the active oxygen Radicals (ROS) generated by the atmospheric particulates damage cell membranes, destroy the permeability of cells, block the exchange of substances between the cells and the outside, easily cause protein denaturation and the like. On the other hand, ROS produced by atmospheric particulates can stimulate intracellular oxidative stress and cause cellular damage.

In addition, the atmospheric particulates can directly influence global climate change by scattering radiation and absorbing radiation sunlight and can be used as a cloud condensation nucleus or an ice nucleus, so that the optical property and the survival time of the cloud are changed, the atmospheric heterogeneous chemical reaction is participated, the atmospheric chemical group is changed, and the influence on human health is not negligible. The particles released into the atmospheric environment include, as a typical oxidative free radical, complex physicochemical actions with other substances, and the migration and transformation occur in the whole environment, and the single-phase and complex-phase transformation mechanisms of the particles attract extensive attention worldwide.

At present, the main method for observing the active oxidation free radicals of the atmospheric particulates is a detection means based on a filter membrane weighing method. There are major problems: high precision microbalances are required (typically over ten thousandth of a gram precision balance is required). The treatment requirements before and after collection are high, the membrane needs constant temperature and humidity balance and weighing, and the environmental condition requirements are high. The membrane dissolving process requires a multi-step process such as ultrasonic oscillation.

In addition, in the process of measuring the active oxidation free radicals of the atmospheric particulates, the particulates are easy to attach to the inner wall of the measuring device, so that the problems of sample loss, influence on the measuring precision and the like are easily caused.

Disclosure of Invention

The invention provides a system for efficiently and automatically cleaning active oxygen free radicals in atmospheric particulates on line, which overcomes the defects of the prior art.

in order to achieve the aim, the invention provides a system for efficiently and automatically cleaning active oxygen free radicals in atmospheric particulates on line, which comprises a component for collecting the atmospheric particulates on line, a fluorescence measuring instrument and an exhaust assembly; the on-line atmospheric particulate collecting component comprises a particulate growing chamber, a steam generator, a steam spray pipe, a plurality of liquid cooling pipes and a cyclone collector; the particle increasing chamber is provided with an air inlet, and the atmospheric sample enters the particle increasing chamber from the air inlet of the particle increasing chamber; the steam generator generates steam, the steam spray pipe is arranged in the air inlet of the particle increasing chamber, and the steam generated by the steam generator is sprayed into the particle increasing chamber through the steam spray pipe; the liquid cooling pipe is arranged on the outer side of the particle increasing chamber, and cooling liquid flows in the liquid cooling pipe to reduce the temperature of the particle increasing chamber; the atmospheric sample and the water vapor are mixed at the air inlet of the particle increasing chamber, and the atmospheric particles in the atmospheric sample absorb moisture, grow and dissolve in water in the process of flowing from the air inlet to the outlet of the particle increasing chamber; the inner wall of the particle increasing chamber is coated with a cerium oxide modified nano hydrophobic coating; the inlet of the cyclone collector is communicated with the outlet of the particle increasing chamber, and atmospheric particle liquid and gas which absorb moisture and increase and are dissolved in water enter the cyclone collector; a fluorescence measuring liquid inlet is arranged in the inlet of the cyclone collector, and the fluorescence measuring liquid enters the cyclone collector from the fluorescence measuring liquid inlet; atmospheric particulate matter liquid and gas which absorb moisture and grow and are dissolved in water are mixed with fluorescence measuring liquid at an inlet of a cyclone collector, and the mixture is separated into gas and collecting liquid in the cyclone collector; the gas is discharged from a gas outlet of the cyclone collector through an exhaust assembly, the exhaust assembly comprises a gas pump, and the gas pump provides power for the atmospheric sample to enter the particle increasing chamber; and discharging the collected liquid from a liquid outlet of the cyclone collector, and detecting the collected liquid by a fluorescence measuring instrument to obtain the concentration of active oxygen radicals in atmospheric particulates in the collected liquid.

Further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: the cerium oxide modified nano hydrophobic coating is prepared from the following components in percentage by mass: 45.11% of epoxy resin, 13.53% of dimethylbenzene, 9.67% of n-butanol, 1.40% of nano cerium oxide, 1.93% of nano silicon oxide, 27.07% of polyamide and 1.29% of dispersing agent.

Further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: the device also comprises a bubble remover, a peristaltic pump for measuring waste liquid and a waste liquid storage tank; the bubble remover, the fluorescence measuring instrument, the waste liquid measuring peristaltic pump and the waste liquid storage tank are sequentially arranged along the flowing direction of the collected liquid; the foam remover is communicated with a liquid outlet of the cyclone collector through a pipeline, and the foam remover removes foam in the collected liquid; detecting the concentration of active oxygen free radicals in atmospheric particulates in the collection liquid by a fluorescence measuring instrument; the peristaltic pump for measuring the waste liquid provides power for the collected liquid to be discharged into the waste liquid storage tank; and the waste liquid storage tank stores the detected collection liquid.

Further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: the liquid cooling device further comprises a waste liquid peristaltic pump, the waste liquid peristaltic pump is arranged between the liquid cooling pipe and the waste liquid storage tank along the flowing direction of the cooling liquid, and liquid in the liquid cooling pipe is discharged into the waste liquid storage tank after being cooled.

further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: the gas pump is arranged in the gas flow direction, and the liquid remover, the regulating needle valve and the gas pump are arranged in sequence; the liquid remover is communicated with the air outlet of the cyclone collector through a pipeline, and the liquid remover removes liquid in the air; and the regulating needle valve controls the sample introduction flow of the atmospheric sample.

further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: wherein the fluorescence measuring instrument detects the concentration of the active oxygen free radicals by the following formula:

C _ROS is the concentration of reactive oxygen species in the atmospheric particulates, FR is the response of the fluorometer in unitless counts, CF is the calibration coefficient calculated from the calibration curve, Q _ls is the flow rate of the liquid sample, and Q _A is the flow rate of the atmospheric sample.

Further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: wherein, the steam generator is annularly arranged on the outer periphery of the air inlet of the particle growing chamber.

further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: wherein, the inlet of the cyclone collector is directly communicated with the outlet of the particle increasing chamber.

Further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: the device also comprises a fluorescent agent measuring liquid peristaltic pump and a fluorescent measuring liquid storage tank; the fluorescence measuring liquid storage tank stores fluorescence measuring liquid, and the fluorescence measuring liquid is conveyed into the inlet of the cyclone collector through the fluorescence measuring liquid peristaltic pump and the fluorescence measuring liquid inlet.

further, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which can also have the following characteristics: the device also comprises a water supply peristaltic pump and a water supply storage tank; the water supply storage tank stores ultrapure water, and the ultrapure water is conveyed into the steam generator through the water supply peristaltic pump.

The invention has the beneficial effects that: the invention provides a system for efficiently and automatically cleaning active oxygen free radicals in atmospheric particulates on line, which enables atmospheric particulates in an atmospheric sample to absorb moisture, grow and be dissolved in water in a particulate matter growth chamber, then the atmospheric particulates are mixed with a fluorescence determination solution, and the accurate concentration of the active oxygen free radicals in the atmospheric particulates is obtained through the detection of a fluorescence measurement instrument. Compared with the traditional measuring method, the system does not need to collect a filter membrane, and the influence of secondary pollution on the accuracy of the measured data is avoided. Wherein, the particulate matter increases the indoor wall coating and has the modified nanometer hydrophobic coating of cerium oxide, can effectively avoid the adnexed of sample liquid drop, and the nanometer coating has "lotus leaf automatically cleaning effect", has improved the collection rate of particulate matter growth room, avoids because of the sample liquid drop adsorbs and causes the sample loss in the indoor wall of particulate matter growth, influences measurement accuracy. Meanwhile, the phenomenon that heat conduction is influenced due to the fact that sample liquid drops are adsorbed on the inner wall of the particle growth chamber is avoided, the temperature of the particle growth chamber can be rapidly reduced through the liquid cooling pipe, and therefore moisture absorption growth efficiency of the measured particles is guaranteed, and accuracy of measuring results is guaranteed.

The online measurement system can be used for online measurement of atmospheric particulate active oxygen radicals and can also be used for online measurement of active oxygen radicals of other particulate systems, rapid detection can be realized, and the time resolution is 5-60 min. The invention has simple principle and simple and convenient operation, can realize automatic control, can realize the on-line detection of the micro-nano aerosol, can also carry out high-efficiency capture on the micro-nano aerosol, can stably operate for a long time, and has reliable result.

the invention can efficiently, automatically and accurately detect the components of the active oxygen free radicals in the atmospheric particulates, overcomes the defects of low time resolution, high operation requirement and complexity of the current filter membrane acquisition and off-line analysis of the atmospheric active oxidation free radicals, provides a rapid, convenient and accurate measurement system for the research of human health, atmospheric pollution, climate change and the like, and simultaneously provides important theoretical and practical significance for the research of the influence of the active oxygen free radicals in the atmospheric particulates on human health and the single-phase and complex-phase chemical reaction process of the active oxygen free radicals and pollutant particles on the conversion mechanism in the atmospheric environment and the artificial emission inhibition technology of the pollutants.

Drawings

FIG. 1 is a schematic structural diagram of a system for efficient self-cleaning online measurement of reactive oxygen radicals in atmospheric particulates;

FIG. 2 is a schematic structural diagram of an on-line atmospheric particulate collection component;

Fig. 3 is an enlarged view of region I in fig. 2 (a state of a liquid droplet on the surface of the cerium oxide-modified nano hydrophobic coating of the particle growth chamber).

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

as shown in FIG. 1, the invention provides a system for efficient self-cleaning online measurement of active oxygen radicals in atmospheric particulates, which comprises an online atmospheric particulate collecting component 1, a water supply peristaltic pump 21, a water supply storage tank 22, a bubble remover 31, a fluorescence measuring instrument 32, a waste liquid measuring peristaltic pump 33, a waste liquid storage tank 34, an exhaust assembly, a waste liquid peristaltic pump 51, a fluorescent agent measuring liquid peristaltic pump 61 and a fluorescence measuring liquid storage tank 62.

as shown in FIG. 2, the part 1 for collecting atmospheric particulates online comprises a particulate growth chamber 11, a steam generator 12, a steam nozzle 13, a plurality of liquid cooling pipes 14 and a cyclone collector 15.

The particle growth chamber 11 has an air inlet, and the atmospheric sample a enters the particle growth chamber 11 from the air inlet of the particle growth chamber 11. An atmospheric sample is a gas stream that includes atmospheric particulates and gaseous materials.

the water supply tank 22 stores ultrapure water, which is supplied into the steam generator 12 by the water supply peristaltic pump 21. A steam generator 12 generates steam, a steam injection pipe 13 is arranged in the air inlet of the particle growth chamber 11, and the steam generated by the steam generator 12 is injected into the particle growth chamber 11 through the steam injection pipe 13.

Wherein, the steam generator 12 is annularly arranged on the periphery of the air inlet of the particle growing chamber 11, so that the generated steam is immediately introduced into the air inlet and mixed with the atmospheric sample, and the heat loss of the steam is reduced.

In this embodiment, the power of the steam generator 12 is 300W, and the continuous winding of the heater wire can continuously generate a high temperature of 150 ℃ on the wall of the ultrapure water pipe, so that the ultrapure water entering the ultrapure water pipe can be gasified into steam in time. The steam nozzle 13 is a 304 stainless steel pipe with an inner diameter of 1mm and a wall thickness of 0.3mm, and the nozzle has an angle of 45 degrees, so that the steam can be sprayed out more uniformly.

The liquid cooling pipe 14 is disposed outside the particle growth chamber 11, and cooling liquid flows in the liquid cooling pipe 14 to reduce the temperature of the particle growth chamber 11.

in this embodiment, the wall of the particle growth chamber 11 is made of frosted passivated aluminum alloy with a thickness of 5mm, so that the heat conduction is good, meanwhile, the surface is passivated, the chemical property is inert, and the reaction with substances such as an atmospheric sample and water vapor is avoided. The liquid cooling pipe 14 is a pure copper pipe with an inner diameter of 10mm and a wall thickness of 1mm, and is welded to the outer wall of the particle increasing chamber 11.

the atmospheric sample a is mixed with water vapor at the air inlet of the particle growth chamber 11, and atmospheric particles in the atmospheric sample are hygroscopic-grown and dissolved in water in the course of flowing from the air inlet to the outlet of the particle growth chamber 11. In the process of flowing from the air inlet to the air outlet of the particle growing chamber 11, the water vapor is condensed into water, and the atmospheric particles in the atmospheric sample can absorb moisture, grow and dissolve into the water, so that the volume of the detected atmospheric particles is increased, and the accuracy of the subsequent measurement result of the fluorescence measuring instrument 32 is improved. And water passes through the mode of vapor, gets into particulate matter increase room 11 with the atmosphere sample jointly, can make more even that atmospheric particulates and water mix to each part atmospheric particulates in making the atmosphere sample can evenly increase, improves the homogeneity that atmospheric particulates increased.

The inner wall of the particle growth chamber 11 is coated with a cerium oxide modified nano hydrophobic coating 111. The contact angle of the liquid drop on the surface of the cerium oxide modified nano hydrophobic coating 111 is more than 150 degrees, and the residual rate of liquid and water is not more than 1.5 percent.

Preferably, the cerium oxide modified nano hydrophobic coating 111 is prepared from the following components in percentage by mass: 45.11% of epoxy resin, 13.53% of dimethylbenzene, 9.67% of n-butanol, 1.40% of nano cerium oxide, 1.93% of nano silicon oxide, 27.07% of polyamide and 1.29% of dispersing agent. The contact angle of the liquid drop of the cerium oxide modified nano hydrophobic coating 111 is 158 degrees.

Fig. 3 is a schematic diagram of the state of liquid drops on the surface of the cerium oxide modified nano hydrophobic coating 111 of the particulate matter growth chamber 11. As shown in fig. 3, since the contact angle of the cerium oxide modified nano hydrophobic coating 111 is large, the liquid drop B (the liquid that the atmospheric particulates absorb moisture to grow and dissolve into water) is not adsorbed on the surface thereof, i.e., the hydrophobic coating can effectively avoid the adhesion of the liquid drop on the inner wall, thereby improving the collection rate of the atmospheric particulates that absorb moisture to grow and dissolve into water, having super-hydrophobic property and low adhesion, and having a lotus leaf effect self-cleaning function, reducing sample loss, and having the characteristics of high efficiency, self-cleaning, accuracy and the like.

The inlet of the cyclone collector 15 is communicated with the outlet of the particle growing chamber 11, and the atmospheric particle liquid and gas which are grown by moisture absorption and dissolved in water enter the cyclone collector 15.

wherein the inlet of the cyclone collector 15 is in direct communication with the outlet of the particle growth chamber 11. Through the pipeline intercommunication promptly to avoid flowing in-process atmospheric particulates to remain on the pipeline inner wall, reduce detection error.

a fluorometric solution inlet 151 is provided in the inlet of the cyclone collector 15. The fluorescence measurement solution storage tank 62 stores a fluorescence measurement solution. The fluorescence measuring solution is conveyed into the inlet of the cyclone collector 15 through the fluorescence measuring solution inlet 151 by the fluorescent agent measuring solution peristaltic pump 61.

the atmospheric particulate liquid and gas growing through moisture absorption and dissolved in water are mixed with the fluorescence measuring liquid at the inlet of the cyclone collector 15, and the mixture is separated into gas A ₁ and collecting liquid A ₂ in the cyclone collector 15, wherein the gas A ₁ is gaseous substances and residual water vapor in the atmospheric sample, and the collecting liquid A ₂ comprises the atmospheric particulate liquid growing through moisture absorption and dissolved in water in the atmospheric sample and the fluorescence measuring liquid, the atmospheric sample growing through moisture absorption and dissolved is mixed with the fluorescence measuring liquid first and then is subjected to gas-liquid separation, and the atmospheric particulate liquid and the fluorescence measuring liquid can be further subjected to gas-liquid separation through the cyclone collector 15 to form a liquid vortex 152 to be fully mixed so as to improve the accuracy of the detection result.

The gas is discharged from the gas outlet of the cyclone collector 15 through the gas discharge assembly.

The gas exhaust assembly comprises a liquid remover 41, a regulating needle valve 42 and a gas pump 43 which are arranged in sequence along the gas flow direction.

The liquid remover 41 is communicated with the air outlet of the cyclone collector 15 through a pipeline. In this example, the pipe is a 304 stainless steel pipe with an inner diameter of 10mm and a wall thickness of 1 mm.

the liquid remover 41 removes liquid in the gas, and when the gas flow rate is 16.7L/min, the liquid water drops are removed to be more than 95%.

The needle valve 42 is adjusted to control the sample introduction flow of the atmospheric sample, the gas flow range is adjusted to 10-30L/min, and the precision is 0.1L/min.

A gas pump 43 powers the atmospheric sample into the particle growth chamber 11. In this embodiment, the gas pump 43 is a Ten-yuan oil-free vacuum pump with a model of 500D, an air extraction flow rate of 51.7L/min, and a vacuum degree of-0.089 MPa.

The collected liquid is discharged from the liquid outlet of the cyclone collector 15, and the fluorescence measuring instrument 32 detects the collected liquid to obtain the concentration of active oxygen radicals in the atmospheric particulates in the collected liquid, namely the concentration of active oxygen radicals in the atmospheric particulates in the atmospheric sample.

The fluorescence-measuring instrument 32 detects the concentration of reactive oxygen radicals by the following formula:

Where C _ROS is the concentration of reactive oxygen species in the atmospheric particulates, FR is the response of the fluorometer under unitless counting, CF is the calibration coefficient calculated from the calibration curve, Q _ls is the flow rate of the liquid sample, and Q _A is the flow rate of the atmospheric sample.

Specifically, the bubble trap 31, the fluorescence measuring instrument 32, the peristaltic pump for measuring waste liquid 33, and the waste liquid storage tank 34 are sequentially disposed along the direction in which the collection liquid flows. The foam remover 31 is communicated with a liquid outlet of the cyclone collector 15 through a pipeline, the foam remover 31 removes foam in the collected liquid, and the removal rate is more than or equal to 95 percent. Fluorescence-measuring instrument 32 detects the concentration of reactive oxygen species in atmospheric particulates in the collection fluid. A peristaltic pump 33 for measuring waste liquid provides power for the collected liquid to drain into a waste liquid storage tank 34. The waste liquid storage tank 34 stores the collected liquid after the detection.

Wherein, along the flowing direction of the cooling liquid, the waste liquid peristaltic pump 51 is arranged between the liquid cooling pipe 14 and the waste liquid storage tank 34, and the liquid in the liquid cooling pipe 14 is discharged into the waste liquid storage tank 34 after being cooled.

In the embodiment, the water supply peristaltic pump 21, the waste liquid peristaltic pump 51, the fluorescent agent determination liquid peristaltic pump 61 and the waste liquid measurement peristaltic pump 33 are all intelligent peristaltic pumps, the model UIP2 WIFI-S196 is, the power is 75W, the rotating speed range is 1-450rpm, the rotating speed control precision is +/-1.0%, the rotating speed regulation resolution is 1.0rpm, the flow range is 1-2200ml/min, and the working range is-40-180 ℃. The water supply tank 22 stores a tank of ultrapure water for 10L. The fluorescence measurement solution storage tank 62 is a 5L dimethyl sulfoxide storage tank. The waste liquid storage tank 34 is a 30L waste liquid storage tank.

During on-line detection, an atmospheric sample A enters the particle increasing chamber 11 from the air inlet of the particle increasing chamber 11, and simultaneously, water vapor generated by the steam generator 12 is sprayed into the particle increasing chamber 11 through the steam spray pipe 13, the water vapor is condensed into liquid water under the action of the liquid cooling pipe 14, atmospheric particles in the atmospheric sample absorb moisture to grow and are dissolved in the water, the atmospheric particle liquid and gas which grow and are dissolved in the water continue to flow and enter the inlet of the cyclone collector 15 from the outlet of the particle increasing chamber 11, meanwhile, fluorescence measurement liquid enters the inlet of the cyclone collector from the fluorescence measurement liquid inlet 151, the atmospheric particle liquid and gas which grow and are dissolved in the water absorb moisture are mixed with the fluorescence measurement liquid at the inlet of the cyclone collector 15, and the mixture is separated into gas A ₁ and collection liquid A ₂ in the cyclone collector.

The gas A ₁ is discharged out of the system through the gas pump 43 after being subjected to liquid removal through the liquid remover 41, the collected liquid A ₂ is subjected to bubble removal through the bubble remover 31 and is detected by the fluorescence measuring instrument 32 to obtain the concentration of active oxygen radicals in atmospheric particulate matters in the collected liquid, namely the concentration of the active oxygen radicals in the atmospheric particulate matters in the atmospheric sample, and then the concentration is discharged to the waste liquid storage tank 34 through the waste liquid measuring peristaltic pump 33.