Size-Segregated Particulate Matter and Carboxylic Acids over Urban and Rural Sites in Londrina City, Brazil

作者：Freitas Adriana de M; Martins Leila D; Solci Maria Cristina^*

来源：Journal of the Brazilian Chemical Society, 2012, 23(5): 921-930.

• size-segregated particulate matter
• carboxylic acids
• PM2.5
• urban and rural aerosols

Samplings of atmospheric particulate matter (PM) from 0.25 to 10 mu m were performed between the months of March and April 2007, simultaneously in urban and rural areas of Londrina City (Parana 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 mu m. 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 Sao Paulo State to Londrina region.

• 出版日期2012-5