Tuet, Wing Y.
Alves, Nilmara de Oliveira
Champion, Julie A.
Ng, Nga L.
Número total de Autores: 8
Afiliação do(s) autor(es):
 Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 - USA
 Univ Sao Paulo, Sch Med, BR-01246903 Sao Paulo - Brazil
 Univ Sao Paulo, Inst Phys, BR-05508 Sao Paulo - Brazil
 Univ Sao Paulo, Inst Chem, BR-05508 Sao Paulo - Brazil
 Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 - USA
Número total de Afiliações: 5
Tipo de documento:
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS;
Citações Web of Science:
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)