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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Chemical Oxidative Potential and Cellular Oxidative Stress from Open Biomass Burning Aerosol

Texto completo
Autor(es):
Tuet, Wing Y. [1] ; Liu, Fobang [1] ; Alves, Nilmara de Oliveira [2] ; Fok, Shierly [1] ; Artaxo, Paulo [3] ; Vasconcellos, Perola [4] ; Champion, Julie A. [1] ; Ng, Nga L. [1, 5]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 - USA
[2] Univ Sao Paulo, Sch Med, BR-01246903 Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Phys, BR-05508 Sao Paulo - Brazil
[4] Univ Sao Paulo, Inst Chem, BR-05508 Sao Paulo - Brazil
[5] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 - USA
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS; v. 6, n. 3, p. 126-132, MAR 2019.
Citações Web of Science: 0
Resumo

Particulate matter (PM) exposure is a leading global human health risk. In this study, water-soluble oxidative potential (OP) and intracellular reactive oxygen and nitrogen species (ROS/RNS) production were measured for open biomass burning aerosol collected from the Brazilian Amazon. Compared to ambient samples collected from Atlanta and laboratory-generated secondary organic aerosol (SOA), biomass burning aerosol had comparable OP and induced higher levels of ROS/RNS. Compared to regressed OP ranges for biomass burning factors resolved using source apportionment in prior studies, the samples investigated in this study spanned a wider OP range, suggesting that concentration addition may not be applicable for OP measurements. The discrepancy between ROS/RNS estimated using laboratory polycyclic aromatic hydrocarbons (PAHs) solution mixtures and ROS/RNS measured for the water-soluble hydrophobic fraction of Amazon filter samples further supports this conclusion. These results have important implications as many previous studies are based on linear regressions that assume concentration addition. Finally, a significant correlation was observed between ROS/RNS and levoglucosan concentrations although exposure to pure solutions of levoglucosan induced negligible ROS/RNS. These results demonstrate that levoglucosan may be considered as a predictor for ROS/RNS even though concentration addition may not be an applicable mixture effect model. (AU)

Processo FAPESP: 13/05014-0 - GoAmazon: interação da pluma urbana de Manaus com emissões biogênicas da Floresta Amazônica
Beneficiário:Paulo Eduardo Artaxo Netto
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
Processo FAPESP: 17/17047-0 - O ciclo de vida de aerossóis e nuvens na Amazônia: emissões biogênicas, emissões de queimadas e impactos no ecossistema
Beneficiário:Paulo Eduardo Artaxo Netto
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático