Water-soluble ions species of size-resolved aerosols: Implications for the atmospheric acidity in São Paulo megacity, Brazil

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dc.contributor.authorVieira-Filho M.
dc.contributor.authorPedrotti J.J.
dc.contributor.authorFornaro A.
dc.date.accessioned2024-03-13T00:52:07Z
dc.date.available2024-03-13T00:52:07Z
dc.date.issued2016
dc.description.abstract© 2016Over 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.
dc.description.firstpage281
dc.description.lastpage287
dc.description.volume181
dc.identifier.doi10.1016/j.atmosres.2016.07.006
dc.identifier.issn0169-8095
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35912
dc.relation.ispartofAtmospheric Research
dc.rightsAcesso Restrito
dc.subject.otherlanguageAcidity
dc.subject.otherlanguageAmmonium
dc.subject.otherlanguageMegacity
dc.subject.otherlanguageSize-resolved aerosols
dc.subject.otherlanguageUrban air pollution
dc.titleWater-soluble ions species of size-resolved aerosols: Implications for the atmospheric acidity in São Paulo megacity, Brazil
dc.typeArtigo
local.scopus.citations28
local.scopus.eid2-s2.0-84978705922
local.scopus.subjectAccumulation modes
local.scopus.subjectAmmonium
local.scopus.subjectAtmospheric depositions
local.scopus.subjectMegacities
local.scopus.subjectPartial neutralization
local.scopus.subjectParticulate Matter
local.scopus.subjectSulfate concentrations
local.scopus.subjectUrban air pollution
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84978705922&origin=inward
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