Caracterização do material particulado fino e grosso e composição da fração inorgânica solúvel em água em São José dos Campos (SP) Caracterization of fine and coarse particulate matter and composition of the water-soluble inorganic fraction in São José dos Campos (SP)

Abstract

Air samples of fine (PM2,5) and coarse (PM2,5-10) particulate matter were collected in São José dos Campos from February 2004 to February 2005. Average PM10 mass concentrations was 31.2 ± 14.0 μg m-3, half of which belonging to the PM2.5 fraction. Ammonium and SO4(2-) were predominantly found in the fine fraction. Average (NH4)2SO4 concentration was estimated to be about 2.9 μg m-3. Chloride, Na+ and NO3- were mostly associated with PM2,5-10. Chloride deficits with respect to sea-salt Cl/Na ratio were found in both size fractions.

Keywords

• airborne particulate matter
• dichotomous
• ammonium sulfate