Atmospheric organic aerosol detection and source analysis method

Abstract

The invention discloses an atmospheric organic aerosol detection and source analysis method. By virtue of offline collection of atmospheric aerosol samples, the spatial resolution of the atmospheric aerosol samples and the size range of particles measured by an aerosol mass spectrometer (AMS) can be widened, and long-term observation of the aerosol can be realized. By virtue of water-soluble and water-insoluble extracted samples, the total components of the organic aerosol can be maximally reduced. The method comprises the following steps: respectively measuring water-soluble organic samples and water-insoluble organic samples by using the AMS, and measuring to obtain an initial water-soluble organic mass spectrum matrix and an initial water-insoluble organic mass spectrum matrix; analyzing the water-soluble organic samples by using a TOC (Total Organic Carbon) analyzer, analyzing the water-insoluble organic samples by using an OC / EC (Organic Carbon / Elemental Carbon) analyzer, and correcting the data acquired by the AMS; performing PMF analysis to obtain factors, and performing correlation comparison with molecular markers measured by the GC-MS (Gas Chromatography-Mass Spectrometer) and LC-MS (Liquid Chromatograph-Mass Spectrometer), thereby improving the source analysis result accuracy. In addition, the filter membrane collection and sample analysis method is simple in operation, and the manpower and equipment maintenance cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an atmospheric organic aerosol detection and source apportionment method. Background technique [0002] Atmospheric aerosols not only affect air quality and atmospheric visibility, endanger public health, affect social and economic development, but also have an important impact on regional and global climate. Organic aerosol (OA) is the most important component of fine particles, and its specific gravity can account for 20% to 90% of the total mass of aerosol. The generation of OA in the atmosphere includes primary direct emissions, mainly including biomass, fossil fuel incineration and cooking emissions, etc., and can also be generated by secondary reactions. The formation of secondary organic aerosols (SOA) requires precursors (for example, volatile organic matter) and the participation of oxidizing agents (such as ozone). [0003] OA can participate in vario...

AI Technical Summary

Problems solved by technology

First, conventional AMS / ACSM can only measure submicron particles (PM 1 ), although a new type of aerodynamic lens has been developed recently, which can be configured on the AMS / ACSM to measure PM 2.5 , but the application of this instrument is less at present, and our understanding of OA in particles > 1 μm is still very limited

In addition, due to the high operating cost and complicated repair and maintenance of AMS, it is usually only used for short-term and high-intensity field observations

Images