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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.  https://doi.org/10.1590/S0103-50532012005000062.

Neste trabalho, as distribuições sazonais de Al, Ca, Cu, Fe, K, Mg, Na, Pb, Zn e de íons majoritários (Cl-, PO43-, NO3-, SO42-, HCOO-, CH3COO-, oxalato, succinato, Na+, NH4+, K+, Mg2+ e Ca2+) foram estudadas na fração PM10 (material particulado menor que 10 mm) na cidade de São Paulo (abril de 2003 a maio de 2004). Os níveis atmosféricos mais elevados foram encontrados para os íons inorgânicos SO42-, NO3-, Cl- e PO43-, e dentre os íons orgânicos, oxalato e formiato. Os níveis atmosféricos para elementos foram: Fe > Al > Ca > K > at > Mg > Zn > Cu > Pb. As fontes relevantes foram: (i) queima de combustíveis e/ou queima de biomassa (NO3-, HCOO-, C2O42-, K+, Mg2+, Ca2+, Fe, Pb, Zn, Al, Ca, K e Mg), (ii) conversão gás-partícula (SO42- e NH4+) e (iii) spray marinho (Cl-, Na+ e Na).

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

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