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High time resolution microsampling method of atmospheric aerosol

An atmospheric aerosol, time-resolved technology, used in measurement devices, analysis materials, material analysis by electromagnetic means, etc., can solve difficult analysis, lack of high-sensitivity analysis methods, and inability to track fine particle aerosol composition time. Changes and other issues, to achieve the effect of high running accuracy

Inactive Publication Date: 2011-06-01
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

Such analysis results are averaged over a day or even several days, and cannot track changes in the composition of fine particle aerosols over time
If the sampling time is shortened, too few aerosol samples are collected, and it is difficult to do further analysis due to the lack of high-sensitivity analysis methods

Method used

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  • High time resolution microsampling method of atmospheric aerosol
  • High time resolution microsampling method of atmospheric aerosol
  • High time resolution microsampling method of atmospheric aerosol

Examples

Experimental program
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Effect test

Embodiment 1

[0037] According to the requirements of the analysis of the measured chemical components, choose a cutter with a particle size range such as PM10, and its aerosol inlet can easily cut the particle size of the aerosol to achieve PM 2.5 Selective precision cutting (such as figure 1 shown). The sampling area is less than 1 square centimeter. According to the concentration of the measured chemical species, under the condition of the sampling flow rate of 15L / min, set the lock-type sampling for 1 hour, select the particles entering the collection system, and mainly remove the coarse particles with a particle size of 10 μm or more , to obtain a sample amount that reaches the detection limit, and then use electrospray escape mass spectrometry to realize the analysis of chemical components in trace samples (such as image 3 shown).

[0038]In this embodiment, paper tape is used as the sampling material, and the mechanical strength, transmittance, chemical stability and other proper...

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Abstract

The invention belongs to an aerosol measuring technology, in particular to a high time resolution microsampling method and device of atmospheric aerosol. The invention realizes the high time resolution microsampling of aerosol in the atmospheric environment by combining a fine particle microsampling device and a rapid high-sensitivity detection technology, realizes the tracking measurement of time resolution aiming at components harmful to human bodies in fine particles and monitors the pollution of the fine particle aerosol. The rapid high-sensitivity detection technology provided by the invention comprises an aerosol particle size cutting technology, an aerosol particle size selecting technology, a high-sensitivity aerosol detection technology and a computer control technology. By applying the fine particle microsampling device provided by the invention, unequal sampling times and different sampling frequencies can be finally set according to different chemical species in different particle size ranges, such as PM10 and PM2.5 to obtain a sampling quantity reaching a detection limit; the corresponding sampling area is smaller than 1 cm<2>, and the whole machine has the weight less than 10 kg and is portable.

Description

technical field [0001] The invention belongs to aerosol measurement technology, and in particular relates to a high-time-resolution micro-sampling method and a device for atmospheric aerosol. Background technique [0002] The component analysis of atmospheric aerosol can be divided into two types: off-line detection and on-line detection according to the test method. In the past ten years, although the advantages of real-time and fast online detection technology cannot replace accurate, systematic and sensitive offline methods, online aerosol detection methods, especially single particle online detection technology, have brought breakthroughs in aerosol detection technology. Many traditional offline detection methods are time-consuming and labor-intensive, which is quite inconvenient. Take the analysis of polycyclic aromatic hydrocarbons in aerosol as an example: common analysis methods include gas chromatography-mass spectrometry, high performance liquid chromatography-mas...

Claims

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Application Information

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IPC IPC(8): G01N27/64
Inventor 杨新陈宏李梅
Owner FUDAN UNIV
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