Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/36840
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dc.creatorVieira-Filho, Marcelo-
dc.creatorPedrotti, Jairo J.-
dc.creatorFornaro, Adalgiza-
dc.date.accessioned2019-09-17T20:37:35Z-
dc.date.available2019-09-17T20:37:35Z-
dc.date.issued2016-
dc.identifier.citationVIEIRA-FILHO, M.; PEDROTTI, J. J.; FORNARO, A. Water-soluble ions species of size-resolved aerosols: implications for the atmospheric acidity in São Paulo megacity, Brazil. Atmospheric Research, [S.l.], v. 181, p. 281-287, 2016. DOI: 10.1016/j.atmosres.2016.07.006.pt_BR
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0169809516301843pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/36840-
dc.description.abstractOver the last decade, an increase of ammonium salts in atmospheric deposition has been reported worldwide, especially in megacities. The present study aims to give a better comprehension analysis about particulate matter acidity in São Paulo megacity (MASP), Brazil. Size-resolved aerosols were sampled in MASP, during 2012 winter, showing a bimodal mass concentration distribution, with sulfate concentration exceeding 3.40 μg m− 3, which accounted for over 25% of PM0.56 mass. Regarding the relative distribution of ionic species, 90% of NH4+ levels, were restricted to smaller than 1 μm diameter range. The average neutralization index for PM < 1 μm was 0.62, which indicated an ammonia-limiting atmosphere due to partial neutralization of atmospheric acids. Particles of the accumulation mode presented more acid behavior than other aerosol fractions, with pH value as low as 4.15 in PM0.56. The total neutralization index registered the lowest value for PM0.56, but it did not respond promptly to aerosol variations as the E-AIM model predictions. The highest discrepancies between the acidity proxies occurred in the smaller fractions of particulate matter, especially in the after-filter (AF) stage (diameter < 0.020 μm). In addition, AF stage had the highest contribution to PM total mass, about 14% for all the stages analyzed. Such contribution indicates that acidity in ultrafine particles are still mixed for the MASP and need further investigation.pt_BR
dc.languageen_USpt_BR
dc.publisherElsevierpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceAtmospheric Researchpt_BR
dc.subjectUrban air pollutionpt_BR
dc.subjectMegacitypt_BR
dc.subjectSize-resolved aerosolspt_BR
dc.subjectAciditypt_BR
dc.subjectAmmoniumpt_BR
dc.subjectAir pollutionpt_BR
dc.subjectIon chromatographypt_BR
dc.titleWater-soluble ions species of size-resolved aerosols: implications for the atmospheric acidity in São Paulo megacity, Brazilpt_BR
dc.typeArtigopt_BR
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