Caracterização do material particulado fino e grosso e composição da fração inorgânica solúvel em água em 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 )2 SO4 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.