AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
The Oxidative Potential of Particulate Matter from Residential Coal Combustion in China
XIAOYING LI, Jianzhong Sun, Caiqing Yan, Guorui Zhi, Yingjun Chen, Shexia Ma, Mei Zheng, Peking University
Abstract Number: 491 Working Group: Health Related Aerosols
Abstract Adverse health effects by ambient fine particulate matter (PM) have been suggested to be associated with production of reactive oxygen species (ROS), such as hydroxyl radical (·OH), superoxide (·O2-), and hydrogen peroxide (HOOH). Transition metals and quinones could contribute to ROS formation, and coal combustion is one of their most important sources in China. Recent studies show that residential coal combustion has a significant contribution to ambient PM in winter in the Northern China due to low temperature and incomplete combustion conditions. To investigate their oxidative potential, chemical species in PM emissions from residential coal combustion were tested in the laboratory, including organic carbon (OC), elemental carbon (EC), soluble ions and multiple trace metals. The amount of ·OH generated by these PM was also measured in an aqueous buffered extract solution as a surrogate lung fluid (SLF). Our preliminary analyses show that the geological maturity of coal plays an important role in the oxidative potential of PM from residential coal combustion. The amount of ·OH generated per unit of particle mass from honeycomb coal was lower than chunk coal. However, due to higher emission factor of PM from honeycomb coal, the total amount of ·OH generated from honeycomb coal was much higher than chunk coal. The influence of coal types, coal stoves, and chemical compositions on ·OH production of PM will be also discussed.