TY - JOUR
T1 - Pollutants from primary sources dominate the oxidative potential of water-soluble PM2.5 in Hong Kong in terms of dithiothreitol (DTT) consumption and hydroxyl radical production
AU - Cheng, Yubo
AU - Ma, Yiqiu
AU - Dong, Biao
AU - Qiu, Xinghua
AU - Hu, Di
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (21976151 and 21477102), the General Research Fund of Hong Kong Research Grant Council (12328216 and 12300914), and the Faculty Research Grant from Hong Kong Baptist University (FRG2/16–17/041). The authors thank the Environmental Central Facility (ENVF) in Hong Kong University of Science and Technology (HKUST) for real-time environmental and air quality data (http://envf.ust.hk/dataview/gts/current/).
Publisher copyright:
© 2020 Elsevier B.V. All rights reserved.
PY - 2021/3/5
Y1 - 2021/3/5
N2 - Increasing scientific findings show that the adverse health effects of PM2.5 are related not only to its mass but also PM2.5 sources and chemical compositions. Here, we conducted a comprehensive characterization and source apportionment of oxidative potential (OP) of water-soluble PM2.5 collected in Hong Kong for one year. Two OP indicators, namely dithiothreitol (DTT) consumption and ∙OH formation, were quantified. Six PM2.5 sources, i.e. secondary sulfate, biomass burning, secondary organic aerosol (SOA), vehicle emissions, marine vessels, and a metal-related factor, were apportioned and identified to be DTT active. The four primary sources accounted for 83.5% of DTT activity of water-soluble PM2.5, with the metal-related factor and marine vessels as the leading contributors. However, only three sources, i.e. metal-related factor, vehicle emissions, and SOA, showed ∙OH generation ability, with a predominant contribution of 96.2% from the two primary sources, especially the metal-related factor (84.5%). Based on the source apportionment results, we further evaluate the intrinsic OP of water-soluble PM2.5 from each source. Marine vessels exhibited the highest intrinsic DTT activity; while metal-related factor was most effective in ∙OH generation.
AB - Increasing scientific findings show that the adverse health effects of PM2.5 are related not only to its mass but also PM2.5 sources and chemical compositions. Here, we conducted a comprehensive characterization and source apportionment of oxidative potential (OP) of water-soluble PM2.5 collected in Hong Kong for one year. Two OP indicators, namely dithiothreitol (DTT) consumption and ∙OH formation, were quantified. Six PM2.5 sources, i.e. secondary sulfate, biomass burning, secondary organic aerosol (SOA), vehicle emissions, marine vessels, and a metal-related factor, were apportioned and identified to be DTT active. The four primary sources accounted for 83.5% of DTT activity of water-soluble PM2.5, with the metal-related factor and marine vessels as the leading contributors. However, only three sources, i.e. metal-related factor, vehicle emissions, and SOA, showed ∙OH generation ability, with a predominant contribution of 96.2% from the two primary sources, especially the metal-related factor (84.5%). Based on the source apportionment results, we further evaluate the intrinsic OP of water-soluble PM2.5 from each source. Marine vessels exhibited the highest intrinsic DTT activity; while metal-related factor was most effective in ∙OH generation.
KW - ROS activity
KW - Source apportionment
KW - Water-soluble PM
KW - Water-soluble transition metals
KW - ∙OH generation ability
UR - http://www.scopus.com/inward/record.url?scp=85092894074&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.124218
DO - 10.1016/j.jhazmat.2020.124218
M3 - Journal article
C2 - 33092883
AN - SCOPUS:85092894074
SN - 0304-3894
VL - 405
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 124218
ER -
