Sealing device for testing yield of secondary organic aerosol and use method of sealed device

Abstract

The invention provides a sealed device for testing the yield of secondary organic aerosol and a use method of the sealed device. The sealed device comprises a polytetrafluoroethylene environment chamber, wherein the volume of the polytetrafluoroethylene environment chamber is 1m<3>; an ultraviolet lamp and a fan made of a polytetrafluoroethylene material are respectively arranged at two ends of the environment chamber; a sample feeding hole and a sampling hole are formed in the wall of the environment chamber; the sample feeding hole is connected with a spherical glass bulb of which the volume is 30cm<3>; organic matters are blown and volatilized in the glass bulb in a nitrogen blowing mode and are further fed into the environment chamber; subsequently, the fan is powered on; after the organic matters are distributed in balance, the ultraviolet lamp is powered on to excite the organic matters to generate the secondary organic aerosol; the generated secondary organic aerosol is collected by using a Tena*TA solid-phase adsorption tube, is desorbed by using a thermal desorption device, and is fed into a gas chromatograph-mass spectrometer for testing. By adopting the sealed device and the use method, multiple uncertain factors of conventional study experiment can be excluded, pollution to the ambient environment can be avoided, the aerosol distribution uniformity can be maintained, and the experimental environment is not interfered.

Description

technical field [0001] The invention relates to a measuring device and a measuring method of an aerosol output, in particular to an airtight device and a measuring method for measuring a secondary organic aerosol output. [0002] technical background [0003] Secondary organic aerosols (Secondary organic aerosols, SOA) is the main component of atmospheric dust (PM2.5, PM10), due to its strong radiation effect and impact on the environment, climate and human health, it is increasingly concerned by people . Secondary organic aerosols produced by oxidation and photooxidation of volatile organic compounds emitted from biological and anthropogenic sources are the major contributors to global atmospheric aerosols. Since McMurry and Grosjean first systematically studied the loss of organic matter in a Teflon environmental chamber in 1985, more and more researchers have reported the important role of the phenomenon of gas wall equilibrium (GWP) of organic compounds in determining SO...

AI Technical Summary

Problems solved by technology

However, the relationship between the gas wall distribution constant (τGWE), the concentration of organic matter on the environmental chamber wall (Cw) and SOA production is controversial.

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