期刊
WATER AIR AND SOIL POLLUTION
卷 185, 期 1-4, 页码 311-321出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11270-007-9455-4
关键词
aerosol characterization; catania metropolitan area; mediterranean basin; size segregated aerosol chemistry; source apportionment; street canyon; total carbon; urban aerosols; water soluble organic carbon
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 (WSOC), Total Carbon (TC) and main inorganic ionic species. The Water-Insoluble Carbon (WINC) was derived by the difference: TC-WSOC. The samples 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 mu m), while the nssSO(4)(=) and NH4+ contribution rises. The water-insoluble carbonaceous matter is the dominant component in the smallest particles (0.05-0.14 mu m). 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 the composition of accumulation mode particles, and marine particles and mineral dust (both important components of the coarse aerosol fraction).
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