CHARACTERIZATION OF PARTICULATE MATTER FROM A HEAVILY INDUSTRIAL ENVIRONMENT

摘要

A characterization of PM aerosols collected in Cubat?o, Brazil is presented. Throughout 2009, 5 sampling campaings were carried out at CEPEMA (Centro de Capacita??o e Pesquisa em Meio Ambiente da Universidade de S?o Paulo), in the vicinity of PETROBRAS oil refinery. Mini-vol portable air sampler was deployed to collect coarse and fine particles. Size-fractionated particle samples were collected by a Micro-Orifice Uniform Deposition Impactor (MOUDI) device. Gravimetric analysis showed three peaks for mass size distributions: the After-Filter stage (cut point diameter of less than 0,1μm), stage 7A (d=0,32μm) and stage 3A (d= 3,2μm). Fine particle matter (FPM) concentrations were almost always lower than coarse particle matter (CPM) concentrations. Comparison between the PM_(2.5) (particulate matter lower than 2.5μg.m~(-3)) measurements by the MOUDI and Mini-Vol sampler reveals good agreement. However, MOUDI underestimates CPM. Reflectance analysis showed that almost all the Black Carbon is found in the Mini-Vol FPM and lower stages of the MOUDI, with higher concentrations at the After-Filter. The atmospheric loading of PM_(2.5) was elevated at night, mainly due to more stable atmospheric conditions. Aerosol samples were analyzed for watersoluble ions, black carbon (BC), and trace elements using a number of analytical techniques.