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| A Study on Oxidative Potential of Fine Particles Measured at an Urban Site and a Rural Site | |||||
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| Writer | 관리자 | Date | 2021-04-14 11:18 | Hit | 207 |
A Study on Oxidative Potential of Fine Particles Measured at an Urban Site and a Rural Site
Abstract In this study, oxidative potentials (OPs) of PM2.5 at an urban site in Gwangju and a rural site in Seosan were evaluated using the dithiothreitol (DTT) assay method. Measurements of PM2.5 were made from October 29 to December 23, 2018 (winter) and from May 1 to June 12, 2019 (summer) in Gwangju, and from October 1 to November 4, 2019 (fall) in Seosan. Results showed that average DTT values in Gwangju were observed to be higher in summer than in winter. At the Seosan site where traffic, biomass burning (BB), and industrial emissions are mixed, average DTT values were observed to be higher than those in Gwangju. At two sites, as the PM2.5 concentration increased, OPs also increased, suggesting that PM2.5 played an important role in determining OP. Furthermore, the OP in Gwangju and Seosan was 2.2 and 1.4 times stronger during Asian dust period than non-Asian dust period, respectively, suggesting significant contribution of mineral dusts to the OP. Correlation analyses indicated that the OP in Gwangju was influenced by the increase in concentrations of the primary combustion emissions (e.g., traffic and BB emissions) and secondary organic aerosols (SOAs) during winter and attributed to the increases in SOA and SO42- concentrations during summer. However, the OP at the Seosan site was affected by the carbonaceous aerosols from BB and traffic emissions as well as the SOA and NO3-. In summary, the difference in emission sources and secondary aerosol formation at the study sites could lead to the difference in OP.
PM2.5, Oxidative potential, DTT assay, Biomass burning, Traffic emissions
▶Sources : Journal of Korean Society for Atmospheric Environment Vol. 36, No. 6, December 2020 |
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