CN113504099A - Integrative structure of organic aerosol collection of atmosphere and thermal desorption - Google Patents

Abstract

The application discloses integrative structure of organic aerosol of atmosphere collection and thermal desorption, first pipeline manifold block and second pipeline manifold block including corresponding the setting from top to bottom, first pipeline manifold block is provided with air inlet pipeline and thermal desorption gas pipeline, second pipeline manifold block be provided with respectively with air inlet pipeline corresponds the pump connection pipeline and the connection detector pipeline that set up with thermal desorption gas pipeline, be provided with the passageway auto-change over device between first pipeline manifold block and the second pipeline manifold block, be provided with the filter membrane on the passageway auto-change over device, the filter membrane set up in air inlet pipeline with connect between the pump connection pipeline or thermal desorption gas pipeline with connect between the detector pipeline. The invention has simple structure, small size, low cost and high thermal desorption efficiency, and is suitable for various organic matter detection equipment in an automated integrated laboratory or an external field.

Description

Integrative structure of organic aerosol collection of atmosphere and thermal desorption

Technical Field

The application relates to atmospheric science, in particular to an atmospheric organic aerosol collecting and thermal desorption integrated structure.

Background

The ground ozone is generated by catalyzing volatile organic gas by nitrogen oxide under the condition of illumination through a complex photochemical reaction. The key difficulty in deeply analyzing the photochemical process of ozone and organic matters and the generation mechanism of secondary organic aerosol is qualitative identification and quantitative analysis of the chemical components and evolution of the atmospheric organic aerosol. The chemical components of the atmospheric organic aerosol are extremely complex, the oxidation speed in the atmosphere is high, and the traditional low-time-resolution off-line acquisition/laboratory analysis method cannot meet the research requirements of the atmospheric organic aerosol. Automated atmospheric organic aerosol analysis patents disclosed today include: CN 106290688, 201810419887, 201720620208.2. The methods adopt a filter membrane acquisition and gas chromatography mass spectrometry analysis and detection method to realize the online analysis of the chemical components of the organic aerosol in the atmosphere.

The existing on-line monitoring technology is designed aiming at the integration of gas chromatography-mass spectrometry detection technology: filter membrane sampling and gas chromatography mass spectrometry. Firstly, the existing design cannot conveniently integrate other organic matter detection technologies; secondly, the existing design samples a four-way valve which is expensive in cost, constant in temperature and coated with an inert coating, and a stainless steel pipeline coated with the inert coating; thirdly, the existing designs are bulky and inconvenient for external use; fourth, the existing design all adopts the heating sample collector to come thermal desorption, and the collector heating is inhomogeneous very easily to lead to thermal desorption inefficiency to influence sample analysis efficiency.

Disclosure of Invention

The invention aims to provide an integrated structure for collecting and thermally desorbing organic aerosol in atmosphere.

In order to achieve the above object, the present invention provides the following technical solutions.

The embodiment of the application discloses integrative structure of organic aerosol of atmosphere collection and thermal desorption, correspond first pipeline manifold block and the second pipeline manifold block that sets up including from top to bottom, first pipeline manifold block is provided with air inlet pipeline and thermal desorption gas pipeline, the second pipeline manifold block be provided with respectively with air inlet pipeline corresponds the connecting pump pipeline and the connecting detector pipeline that sets up with thermal desorption gas pipeline, be provided with the passageway auto-change over device between first pipeline manifold block and the second pipeline manifold block, be provided with the filter membrane on the passageway auto-change over device, the filter membrane set up in air inlet pipeline with between the connecting pump pipeline or thermal desorption gas pipeline with between the connecting detector pipeline.

Preferably, in the above-mentioned integrative structure of organic aerosol collection of atmosphere and thermal desorption, channel switching device one side is provided with drive arrangement, the drive arrangement drive channel switching device drives the filter membrane set up in the air sampling pipeline with connect between the pump pipeline or thermal desorption gas pipeline with connect between the detector pipeline.

Preferably, in the above-mentioned integrated structure of collecting and thermally desorbing the organic aerosol in the atmosphere, a first sealing gasket is arranged at the bottom of the first pipeline manifold block.

Preferably, in the above-mentioned integrated structure of collecting and thermally desorbing the organic aerosol in the atmosphere, a second sealing gasket is arranged at the top of the second pipeline manifold block.

Preferably, in the above-mentioned integrated structure of collecting and thermally desorbing the organic aerosol in the atmosphere, a gas heating device and a temperature sensor are disposed on the thermal desorption gas pipeline.

Preferably, in the above-mentioned integrated structure of collecting and thermally desorbing the organic aerosol in the atmosphere, one end of the thermal desorption gas pipeline, which is away from the first pipeline manifold block, is connected to a helium/nitrogen pipeline, and a flow controller is arranged on the helium/nitrogen pipeline.

Compared with the prior art, the invention has the advantages of simple structure, low cost, small size and high thermal desorption efficiency, and is suitable for various organic matter detection equipment in an automated integrated laboratory or an external field.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of an integrated structure of atmospheric organic aerosol collection and thermal desorption according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, an integrated structure 100 for collecting and thermally desorbing organic aerosol in atmosphere includes a first pipeline manifold 101 and a second pipeline manifold 102 which are correspondingly disposed up and down, the first pipeline manifold 101 is provided with an air inlet pipeline 103 and a thermal desorption gas pipeline 104, the second pipeline manifold 102 is provided with a connection pump pipeline 105 and a connection detector pipeline 106 which are respectively disposed corresponding to the air inlet pipeline 103 and the thermal desorption gas pipeline 104, a channel switching device 107 is disposed between the first pipeline manifold 101 and the second pipeline manifold 102, a filter membrane 108 is disposed on the channel switching device 107, and the filter membrane 108 is disposed between the air inlet pipeline 103 and the connection pump pipeline 105 or between the thermal desorption gas pipeline 104 and the connection detector pipeline 106. A driving device 109 is arranged on one side of the channel switching device 107, and the driving device 109 drives the channel switching device 107 to drive the filter membrane 108 to be arranged between the air sample introduction pipeline 103 and the connection pump pipeline 105 or between the thermal desorption gas pipeline 104 and the connection detector pipeline 106. The first pipe block 101 is provided at the bottom thereof with a first gasket 110. The second pipe block 102 is provided at the top thereof with a second gasket 111. The thermal desorption gas pipe 104 is provided with a gas heating device 112 and a temperature sensor 113. The end of the thermal desorption gas pipe 104 facing away from the first pipe manifold 101 is connected to a helium/nitrogen pipe 114, and a flow controller 115 is disposed on the helium/nitrogen pipe 114.

In this embodiment, the stainless steel material that adopts has air sampling pipeline, first pipeline integrated package, connection pump pipeline, adopts the quartz material have filter membrane, passageway auto-change over device, second pipeline integrated package, connection detector pipeline.

The specific operation is as follows:

1. sample collection mode: the filter membrane is switched to the bottom of the air sample introduction pipeline under the action of the driving device, and the sample is collected under the action of the connecting pump pipeline. If the detector is a gas chromatography mass spectrometry (GC/MS) analysis, the GC/MS analyses the sample collected in the previous round at the same time as the sample is collected.

2. Thermal desorption mode: the filter membrane is switched to and is connected on the detector pipeline under drive arrangement's effect, and gas heating device lets in the filter membrane with the gas of heating, with sample thermal desorption, and the sample of thermal desorption gets into the detector through connecting the detector pipeline and detects. If the detector is used for gas chromatography mass spectrometry (GC/MS) analysis, the heated gas can be condensed at the front end of the gas chromatographic column again, and the GC/MS analysis is carried out after the thermal desorption mode is finished; if the detector is a real-time detection method such as mass spectrometry, Fourier transform infrared spectroscopy (FTIR) or a small sensor, the sample is detected and analyzed simultaneously with thermal desorption.

The technical scheme has the following advantages:

1. an integrated structure of atmospheric organic aerosol collection and thermal desorption is designed, and a plurality of organic matter detection methods such as gas chromatography mass spectrometry (GC/MS), mass spectrometry, Fourier transform infrared spectroscopy (FTIR), small sensors and the like can be automatically integrated.

2. The part of the instrument in contact with the high temperature sample is made of high temperature resistant inert quartz material instead of expensive stainless steel material, which needs to be replaced with inert coating layer frequently.

3. The cheap electric slide block is adopted to carry out the function switching of acquisition and thermal desorption/analysis, and the expensive 4-way valve is replaced to carry out the function switching.

4. The heated desorption gas is adopted, namely the heated gas is used for impacting the sample, so that the sample is thermally desorbed to replace a heated sample collector for thermal desorption. This can avoid because the collector heats inhomogeneous thermal desorption inefficiency that leads to, influences sample analysis efficiency.

5. The design is small, the size of the main structure is only 32cm by 14cm by 8cm, and the device is convenient for various purposes, laboratories or external field scenes.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (6)

1. The utility model provides an integrative structure of organic aerosol of atmosphere collection and thermal desorption, a serial communication port, first pipeline manifold block and second pipeline manifold block that correspond the setting from top to bottom including, first pipeline manifold block is provided with air inlet pipeline and thermal desorption gas pipeline, second pipeline manifold block be provided with respectively with air inlet pipeline corresponds the connection pump pipeline and the connection detector pipeline that sets up with thermal desorption gas pipeline, be provided with passageway auto-change over device between first pipeline manifold block and the second pipeline manifold block, be provided with the filter membrane on the passageway auto-change over device, the filter membrane set up in air inlet pipeline with between the connection pump pipeline or thermal desorption gas pipeline with between the connection detector pipeline.

2. The integrated structure for collecting and thermally desorbing organic aerosol according to claim 1, wherein a driving device is disposed at one side of the channel switching device, and the driving device drives the channel switching device to drive the filter membrane to be disposed between the air sampling pipeline and the connection pump pipeline or between the thermal desorption gas pipeline and the connection detector pipeline.

3. An integrated atmospheric organic aerosol collection and thermal desorption structure as claimed in claim 1, wherein the bottom of the first pipeline manifold block is provided with a first sealing gasket.

4. An integrated atmospheric organic aerosol collection and thermal desorption structure as claimed in claim 1, wherein a second sealing gasket is arranged on the top of the second pipeline manifold block.

5. The integrated atmospheric organic aerosol collection and thermal desorption structure of claim 1, wherein the thermal desorption gas pipeline is provided with a gas heating device and a temperature sensor.

6. An integrated atmospheric organic aerosol collection and thermal desorption structure as claimed in claim 1, wherein the end of the thermal desorption gas pipeline away from the first pipeline manifold block is connected to a helium/nitrogen pipeline, and a flow controller is arranged on the helium/nitrogen pipeline.

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