We have used PIXE together with receptor modeling for quantiative source apportionment of remote aerosols. The Sao Paulo PIXE system uses an 8 MeV alpha particle beam, and it can detect elements with 2 > 11 with a detection limit between 1 and 30ngm ‘. We sampled atmospheric aerosols in six remote sites: Amazon Basin, Atlantic Forest. Arembepe, Fernando de Noronha. Firminopolis and Itaberai. Sampling was performed using stacked filter units, cascade impactors with 6 or 10 stages and linear streakers. Source apportionment of the coarse mode aerosols was done using three receptor models: chemical mass balance, principal factor analysis and stepwise multiple regression analysis. Three sources of aerosols were quantiatively distinguished: marine aerosols, soil dust and aerosols released by plants. The emission of aerosols by vegetation is very clear for all sampling sites and with all three receptor models. In the Amazon Basin and Atlantic Forest the aerosol released by plants is the major source and accounts for 60-807~ of airborne concentrations.
We have used PIXE together with receptor modeling for quantiative source apportionment of remote aerosols. The Sao Paulo PIXE system uses an 8 MeV alpha particle beam, and it can detect elements with 2 > 11 with a detection limit between 1 and 30ngm ‘. We sampled atmospheric aerosols in six remote sites: Amazon Basin, Atlantic Forest. Arembepe, Fernando de Noronha. Firminopolis and Itaberai. Sampling was performed using stacked filter units, cascade impactors with 6 or 10 stages and linear streakers. Source apportionment of the coarse mode aerosols was done using three receptor models: chemical mass balance, principal factor analysis and stepwise multiple regression analysis. Three sources of aerosols were quantiatively distinguished: marine aerosols, soil dust and aerosols released by plants. The emission of aerosols by vegetation is very clear for all sampling sites and with all three receptor models. In the Amazon Basin and Atlantic Forest the aerosol released by plants is the major source and accounts for 60-807~ of airborne concentrations.
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