Source apportionment of single aerosol particles in the rnatmosphere of Shanghai city

摘要

A nuclear microprobe with high spatial resolution and high analytirncal sensitivity was applied to analyze atmospheric aerosol at five monitoring sites in rnShanghai city. Meantime, a new pattern recognition technique, which used the micrornPIXE spectrum of a single aerosol particle as its fingerprint, was developed to identify rnthe origin of the particle. The results showed that the major contributors to the atrnmosphere pollution were soil dust (31.6%), building dust (30.8%), and the next were rnvehicle exhaust (13.7%), metallurgic industry excrements (5.6%), oil combustion (5%)rnand coal combustion (2.3%). Besides these, about 10% of the particles could not be rnidentified. Based on the cluster analysis of these particles, they could be divided into rneight groups. By inference, they might belong to some sub-pollution sources from rnsoil dust, building dust and metallurgic industry excrements. Moreover, some new rnpollution sources from tyres and chemical plants were also revealed.