Characterization Of Urban Aerosol In Campinas, São Paulo, Brazil

A quantitative study was performed in Campinas, Brazil. Measurements were taken on an avenue with intense vehicle traffic in the city's downtown area from August 2003 to August 2004. A dichotomous sampler was employed for PM2.5 and PM10. Samples were collected for 24 h at 3-day intervals. In addition, seasonal variations were investigated, using a MOUDI cascade impactor and VOC adsorption tubes, during a specific 5-day period in the summer of 2003 (December) and the winter of 2004 (August). The polycarbonate filters were analyzed by gravimetry, Particle Induced X-ray Emission (PIXE), ion chromatography and reflectance, to identify the mass concentration, elemental composition, ions and elemental carbon mass, respectively. The quartz filters were analyzed by gravimetry and thermal combustion carbon analysis to identify the mass concentration and carbon mass. Results showed an annual mean of 20.85, 10.68 and 10.17 μg m- 3 for PM10, PM2.5 and PM2.5-10, respectively. The cascade impactor provided mass distribution and revealed differences between the two seasons. The size distribution for chemical elements indicated soil-derived elements in the coarse fraction. PM winter concentrations were expected to be higher than those in summer, but that was not the case during the days of this study, when summer and winter concentrations were almost identical The PIXE analysis revealed metals and metal compounds, soil-derived elements, sulfates, carbonates, chlorides and other anthropogenic air-borne particles, supposing molecules in their usual composition. An analysis of the VOCs revealed benzene, toluene, m,p-xylene, n-hexane, 2-metilhexane and n-nonane. A mass balance analysis indicated different classes, among which elemental carbon was the most abundant, followed by organic carbon, soil elements and industrial sources. © 2007 Elsevier B.V. All rights reserved.872147157Andrade, F., Orsini, C., Maenhaut, W., Relation between aerosol sources and meteorological parameters for inhalable atmospheric particles in Sao Paulo City, Brazil (1994) Atmospheric Environment, 28, pp. 2307-2315Boueres, L.C.S., Orsini, C.M.Q., Fine and coarse elemental components in the urban aerosol of São Paulo, Brazil (1981) Nuclear Instruments and Methods, 181, pp. 417-424Buzcu, B., Fraser, M.P., Source identification and apportionment of volatile organic compounds in Houston, TX (2006) Atmospheric Environment, 40, pp. 2385-2340Castanho, A.D.A., Artaxo, P., Wintertime and summertime São Paulo aerosol source apportionment study (2001) Atmospheric Environment, 35, pp. 4889-4902Cetesb, (2006) Relatório de qualidade do ar no Estado de São Paulo, 2005, , http://www.cetesb.sp.gov.br/Ar/relatorios.asp, (in Portuguese, http://www.cetesb.sp.gov.br/Ar/relatorios.asp)Colón, M., Pleil, J.D., Hartlage, T.A., Guardani, M.L., Martins, M.H., Survey of volatile organic compounds associated with automotive emissions in the urban airshed of Sao Paulo, Brazil (2001) Atmospheric Environment, 35, pp. 4017-4031Finlayson-Pitts, B.J., Pitts, J., (2000) Chemistry of the upper and lower atmosphere: theory, experiments and placations, , Academic Press 969 ppJohansson, S.A.E., Campbell, J.L., Malmqvist, K.G., (1995) Particle Induced X-Ray Emission Spectrometry (PIXE), , Wiley-Interscience, NY 451 ppMarple, V.A., Kenneth, L.R., Steven, M.B., A microorifice uniform deposit impactor (MOUDI): description, calibration and use (1986) Journal of Aerosol Science, 17, p. 489Martins, E.M., Arbilla, G., Bauerfeldt, G.F., Paula, M., Atmospheric levels of aldehydes and BTEX and their relationship with vehicular fleet changes in Rio de Janeiro urban area (2007) Chemosphere, 67, pp. 2096-2103Miranda, R.M., Andrade, M.F., Physicochemical characteristics of atmospheric aerosol during winter in the São Paulo Metropolitan Area in Brazil (2004) Atmospheric Environment, 39 (33), pp. 6188-6193Miranda, R.M., Andrade, M.F., Worobiec, A., Van Grieken, R., Characterization of aerosol particles in the São Paulo Metropolitan Area (2002) Atmospheric Environment, 36, pp. 345-352Na, K., Kim, Y.P., Moon, K.C., Moon, I., Fung, K., Concentrations of volatile organic compounds in an industrial area of Korea (2001) Atmospheric Environment, 35, pp. 2747-2756Pandis, S.N., Harley, R.A., Cass, G.R., Seinfeld, J.H., Secondary organic aerosol formation and transport (1992) Atmospheric Environment, 26, pp. 2747-2756Richards, J.H., Marriott, C., Effect of relative humidity on the rheologic properties of bronchial mucus (1974) American Review of Respiratory Disease, 109, pp. 484-486Seinfeld, J.H., Pandis, S.N., (1998) Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, , Wiley-Interscience, New York 1326 ppTresmondi, A.C.C.L., Tomaz, E., Air pollution and influence of sources on Paulínia (Brazil) and surroundings (2004) International Journal of Environment and Pollution, Suiça, 22 (4), pp. 490-506Van Espen, P., Quantitative microbeam analysis of particles (1994) Microchimica Acta, 114-115, p. 129Watson, J.G., Chow, J.C., Fujita, E.M., Review of volatile organic compound source apportionment by chemical mass balance (2001) Atmospheric Environment, 35, pp. 1564-158