Chemical Characterization and Source Apportionment of Size-Segregated Aerosol Collected at an Urban Site in Sicily

摘要

Aerosol samples were collected at Catania (Italy), from 16 March to 13 June 2005. The sampling was performed using a low pressure five-stage Berner cascade impactor The samples were analysed for total aerosol mass, Water Soluble Organic Carbon (WSOG), Total Garbon (TC) and main inorganic ionic species. The Water-Insoluble Garbon (WINC) was derived by the difference: TG-WSOC. Thernsamples share some common features: ammonium sulphate and carbon-containing species (both soluble and insoluble) are the largest contributors of fine particle mass, while coarse particles essentially consist of sea-salt, sodium nitrate and unaccounted PM (probably crustal material). The WINC/WSOC ratio decreases from the smallest size range to the large accumulation mode range (0.42-1.2 μm), while the nssSO_4~= and NH_4~+ contribution rises: The water-insoluble carbonaceous matter is the dominant component in the smallest particles (0.05-0.14 μm). We identified four different aerosol types, corresponding to different sources, contributing to the total particles load of the investigated urban environment: vehicular traffic, producing primary carbonaceous insoluble particles, secondary aerosols, dominating tile composition of accumulation mode particles, and marine particles and mineral dust (both important components of the coarse aerosol fraction).