AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
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Ambient PM2.5 in South Korea and Philippines: Oxidative Potential, Chemical Characteristics, and Source Apportionment
LUCILLE JOANNA BORLAZA, Enrique Cosep, Seojong Kim, Kwangyul Lee, HungSoo Joo, Daphne Bate, Jinsang Jung, Mylene Cayetano, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 264 Working Group: Health Related Aerosols
Abstract There has been growing literature supporting the hypothesis that one of the most important pathways underlying the adverse health effects of exposure to fine particulate matter (PM2.5) is through oxidative stress derived from the interaction of PM2.5 with cells. This has been quantified by substantial research via determination of oxidative potential (or OP) of PM2.5. The OP analysis can assess the capability of PM2.5 to produce reactive oxygen species (ROS) which is suggested that at exceeding normal range have considerable health implications. This study looked into OP and its association with chemical composition of source apportioned ambient PM2.5 collected from different site types in South Korea and an urban site in the Philippines. Ambient PM2.5 was collected on zeflour and quartz filters using URG cyclones and Airmetrics Minivol samplers during country-specific seasons. Chemical characterization was done by analyzing ions, metals, organic carbon (OC), and elemental carbon (EC) concentrations. Two a-cellular chemical assays were used to quantify OP of water-soluble PM2.5: Dithiothreitol (DTT) and Electron Spin Resonance (ESR) assay. The correlations between the measured OP from both assays and the concentrations of PM2.5 chemical components were investigated. Positive Matrix Factorization (PMF) and Principal Component Analysis with Multiple Linear Regression (PCA-MLR) were performed in order to apportion the relative contributions of various sources to OP of water-soluble PM2.5. Results of OP, chemical analysis, and source apportionment will be presented in this study.