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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053

Abstract

ROCHA, Gisele O. Da et al. Seasonal distribution of airborne trace elements and water-soluble ions in São Paulo Megacity, Brazil. J. Braz. Chem. Soc. [online]. 2012, vol.23, n.10, pp.1915-1924.  Epub Nov 06, 2012. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532012005000062.

This study deals with the seasonal distribution of Al, Ca, Cu, Fe, K, Mg, Na, Pb and Zn and water soluble ions (Cl-, PO43-, NO3-, SO42-, HCOO-, CH3COO-, oxalate, succinate, Na+, NH4+, K+, Mg2+ and Ca2+) found in PM10 samples (particulate matter less than 10 mm in diameter) São Paulo City, Brazil, (April 2003-May 2004). Higher atmospheric levels were found for SO42-, NO3-, Cl- and PO43- while the main organic anions were oxalate and formate. Atmospheric levels for elements were: Fe > Al > Ca > K > Na > Mg > Zn > Cu > Pb. Some sources were predominant for some species: (i) fuel burning and/or biomass burning (NO3-, HCOO-, C2O42-, K+, Mg2+, Ca2+, Fe, Pb, Zn, Al, Ca, K and Mg), (ii) gas-to-particle conversion (SO42- and NH4+) and (iii) sea salt spray (Cl-, Na+ and Na).

Keywords : major ion composition; water-soluble ions; trace elements; seasonal distribution of atmospheric contaminants; airborne particulate matter.

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