10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Reactive Oxygen Species of Ambient Water-soluble PM2.5 in the North and Northwestern China: Contrasts in Concentration and Sources
YAQING ZHOU, Rujin Huang, Junji Cao, Key Laboratory of Aerosol Chemistry and Physics, IEECAS
Abstract Number: 455 Working Group: Aerosol Chemistry
Abstract PM2.5 pose an unequivocally health problem, which may penetrate deeply into the human respiratory system and leading to oxidative stress. China has suffered severe haze problems during winter in recent years. So far, a direct causative link between particle properties and adverse health effects and the main sources of these toxic components is currently lacking. In this study, the ROS concentration, link between chemical components and ROS, source apportionment of particle-bound ROS are reported in three major cities in north and northwestern China. The average particle-bound ROS concentration in Beijing, Xi’an, Shijiazhuang during 2013 winter were measured using DCFH method, which were 0.43±0.38, 0.89±0.55 and 0.76±0.46 nmol H2O2•m-3, respectively. The mass ROS efficiencies of three cities were 0.005, 0.005 and 0.002. Xi’an has the largest ROS concentration and mass efficiency. Different level of water-soluble metal seems to have obvious influence on ROS that high water-soluble Fe may accelerate the formation of ROS, and high water-soluble Cu may reduce the increase of ROS. Based on preliminary source apportionment result, vehicle emission has the largest contribution (40%) to ROS, and biomass burning increase obviously when air condition changed from cleans days to extreme pollution days.