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Size-segregated particulate matter and carboxylic acids over urban and rural sites in Londrina City, Brazil

2012; Brazilian Chemical Society; Volume: 23; Issue: 5 Linguagem: Inglês

10.1590/s0103-50532012000500018

1678-4790

Adriana de Marques Freitas, Leila Droprinchinski Martins, Maria Cristina Solci,

Atmospheric chemistry and aerosols

Samplings of atmospheric particulate matter (PM) from 0.25 to 10 µm were performed between the months of March and April 2007, simultaneously in urban and rural areas of Londrina City (Paraná State, Brazil). Results indicated that the fine fraction (PM2.5) represents a significant portion of the PM10 mass (70 and 67% in urban and rural areas, respectively). Dicarboxylic acids were found in larger concentration, contributing to the PM2.5 fraction with 78% in urban and 69% in rural areas, being oxalate and succinate the most abundant species. Mass size distribution of oxalate in urban site was presented as the dominant mode, with peaks at 0.25-0.5 µm. Acetate-to-formate mass ratio indicated the primary vehicular emissions as dominant source of carboxylic acids in Londrina. Moreover, backward trajectories indicated the transport of pollutants from São Paulo State to Londrina region.