Resumo

HERRERA MURILLO, J.; ROJAS MARIN, J. F.; RODRIGUEZ ROMAN, S.  e  BAEZ PEDRAJO, A. P.. Concentration of PM₁₀ in the Metropolitan Area of Costa Rica, Central America: Chemical composition and potential sources. Atmósfera [online]. 2010, vol.23, n.4, pp.307-323. ISSN 0187-6236.

Measurements of metals and inorganic ions were carried out on PM₁₀. Sampling was made in five sites distributed in San José, Heredia and Belén cities. Samples were collected using Thermo Andersen PM₁₀ high volume samplers with glass fiber and quartz filters. The ions SO₄^2-, NO₃^-, Cl^-, F^-, PO₄^3-, NH₄⁺, K⁺, Na⁺, Ca²⁺, Mg²⁺ were analyzed by ion chromatography and in the case of metals V, Cu, Cr, Pb, Ni, Mn, Fe, Al using an atomic absorption spectrometer with a graphite furnace attachment. The results indicated that SO₄^2- was the most abundant ion, and with respect to metals, Al and Fe had the highest concentration. Spearman correlation, applied to all data, showed a high correlation between SO₄^2-, NO₃^- and NH₄⁺ indicating a common anthropogenic origin. From the metal species that were assessed only Pb and Cu presented enrichment factors higher than 10, indicating an anthropogenic contribution. Particles collected in the industrial zone of Belén showed the highest level of acidity and metal content.

Palavras-chave : Water soluble ions; particulate matter; metals; Costa Rica.

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