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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 8
[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
Total Affiliations: 5
Document type: Journal article
Source: ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS; v. 6, n. 3, p. 126-132, MAR 2019.
Web of Science Citations: 4

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)

FAPESP's process: 13/05014-0 - GoAmazon: interactions of the urban plume of Manaus with biogenic forest emissions in Amazonia
Grantee:Paulo Eduardo Artaxo Netto
Support type: Research Program on Global Climate Change - Thematic Grants
FAPESP's process: 17/17047-0 - Aerosol and clouds life cycles in Amazonia: biogenic emissions, biomass burning and impacts on ecosystem
Grantee:Paulo Eduardo Artaxo Netto
Support type: Research Program on Global Climate Change - Thematic Grants