Investigating the behavior of organic and inorganic species in the rainwater of Ri...
| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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 |