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Measurements of trace metals and inorganic ions were carried out on PM10 aerosols sampled at two sites in the
city of San Jose, Costa Rica. Samples were collected with a Thermo Andersen high volume PM10 sampler on glass
fiber and quartz filters. The ions SO42-, NO3-, Cl-, F-, PO43-,
NH4+, K+, Na+, Ca2+ and Mg2+ were analyzed by ion
chromatography and the trace metals V, Cu, Cr, Pb, Ni, Mn, Fe and Al were analyzed using an atomic absorption
spectrometer with a graphite furnace attachment. The results indicated that SO42- was the most abundant ion,
and Al the trace metal with the highest concentration.
Pearson's correlation applied to all data showed a high correlation among SO42-, NO3- and NH4+, indicating a
common anthropogenic origin. In addition, the correlation found between Na+-K+ and Ca2+-Mg2+ indicated a crustal
origin. No correlation was found among the trace metals except Cu-Cr and Fe-Cr. The influence of wind direction
on trace metal concentrations is also discussed.