HR: 1400h
AN: A43A-04    [Abstracts]
TI: A wintertime study of atmospheric aerosols collected in São Paulo, Brazil.
AU: * Vasconcellos, P C
EM: perola@iq.usp.br
AF: Institute of Chemistry - University of São Paulo, Av. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil
AU: Ogura, L
EM: lucylina@yahoo.com.br
AF: Institute of Chemistry - University of São Paulo, Av. Lineu Prestes, 748, São Paulo, SP 05508-000, Brazil
AU: Lopes, W
EM: willopes@ufba.br
AF: Institute of Chemistry - Federal University of Bahia, Rua Barão de Geremoabo 147, Salvador, BA 40170-290, Brazil
AU: Pereira, P A
EM: pedroapp@ufba.br
AF: Institute of Chemistry - Federal University of Bahia, Rua Barão de Geremoabo 147, Salvador, BA 40170-290, Brazil
AU: Andrade, J B
EM: jailsong@ufba.br
AF: Institute of Chemistry - Federal University of Bahia, Rua Barão de Geremoabo 147, Salvador, BA 40170-290, Brazil
AU: Sanchez-Ccoyllo, O
EM: osanchez@usp.br
AF: Institue of Atmosheric Sciences - University of São Paulo, Rua do Matão, São Paulo, SP 05508-000, Brazil
AB: Atmospheric pollution has become a significant problem for urban areas worldwide. In megacities aerosols are released by different emissions sources. These sources can emit particles in a large variety of sizes. Size distributions provide information on the sources and the sources processes of particles or species (Maenhaut et al. 2002). In the wintertime (2005) twenty PM10 samples were collected in São Paulo city using hi-vol sampler and fine particles (from 6 to 18,000 nm) were collected using NanoMoudi impactor. Polycyclic aromatic hydrocarbons (PAH) recognised as mutagen and carcinogen compounds were identified in PM10 samples and gravimetric concentrations were calculated for fine particles. The results showed PAH total concentrations ranged from 0.27 to 43.8 ng m-3. Phenanthrene (7.3 ng m-3) and anthracene (2.2 ng m-3), lighter compounds were the most abundant PAH; benz(a)pyrene (1.4 ng m-3) mutagenic compound was found in higher concentration than previous work. For PM10 concentrations, 60% of the samples (n=12) are higher than WHO standards (50 μg m-3). Three modes can be found in the particles with mean diameter: 44 nm, 440 nm and 14000 nm. It is in agreement with the fact this site is located inside a large green area (campus of the University of São Paulo), which can be source of particles between 25 and 440 nm. We conclude that at this urban site vehicular emissions are indicated as being the most important PAH emitters. For fine particles, soil resuspension and biogenic emissions seem to be the most important sources.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly