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Oxidative potential of ambient PM2.5 in the coastal cities of the Bohai Sea, northern China: Seasonal variation and source apportionment.
Environ Pollut. 2018 May; 236:514-528.EP

Abstract

Emissions of air pollutants from primary and secondary sources in China are considerably higher than those in developed countries, and exposure to air pollution is main risk of public health. Identifying specific particulate matter (PM) compositions and sources are essential for policy makers to propose effective control measures for pollutant emissions. Ambient PM2.5 samples covered a whole year were collected from three coastal cities of the Bohai Sea. Oxidative potential (OP) was selected as the indicator to characterize associated PM compositions and sources most responsible for adverse impacts on human health. Positive matrix factorization (PMF) and multiple linear regression (MLR) were employed to estimate correlations of PM2.5 sources with OP. The volume- and mass-based dithiothreitol (DTTv and DTTm) activities of PM2.5 were significantly higher in local winter or autumn (p < 0.01). Spatial and seasonal variations in DTTv and DTTm were much larger than mass concentrations of PM2.5, indicated specific chemical components are responsible for PM2.5 derived OP. Strong correlations (r > 0.700, p < 0.01) were found between DTT activity and water-soluble organic carbon (WSOC) and some transition metals. Using PMF, source fractions of PM2.5 were resolved as secondary source, traffic source, biomass burning, sea spray and urban dust, industry, coal combustion, and mineral dust. Further quantified by MLR, coal combustion, biomass burning, secondary sources, industry, and traffic source were dominant contributors to the water-soluble DTTv activity. Our results also suggested large differences in seasonal contributions of different sources to DTTv variability. A higher contribution of DTTv was derived from coal combustion during the local heating period. Secondary sources exhibited a greater fraction of DTTv in summer, when there was stronger solar radiation. Traffic sources exhibited a prevailing contribution in summer, and industry contributed larger proportions in spring and winter. Future abatement priority of air pollution should reduce the sources contributing to OP of PM2.5.

Authors+Show Affiliations

Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China. Electronic address: wxliu@urban.pku.edu.cn.Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China. Electronic address: qyliu@njfu.edu.cn.Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.Key Laboratory for Earth Surface and Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29428706

Citation

Liu, WeiJian, et al. "Oxidative Potential of Ambient PM2.5 in the Coastal Cities of the Bohai Sea, Northern China: Seasonal Variation and Source Apportionment." Environmental Pollution (Barking, Essex : 1987), vol. 236, 2018, pp. 514-528.
Liu W, Xu Y, Liu W, et al. Oxidative potential of ambient PM2.5 in the coastal cities of the Bohai Sea, northern China: Seasonal variation and source apportionment. Environ Pollut. 2018;236:514-528.
Liu, W., Xu, Y., Liu, W., Liu, Q., Yu, S., Liu, Y., Wang, X., & Tao, S. (2018). Oxidative potential of ambient PM2.5 in the coastal cities of the Bohai Sea, northern China: Seasonal variation and source apportionment. Environmental Pollution (Barking, Essex : 1987), 236, 514-528. https://doi.org/10.1016/j.envpol.2018.01.116
Liu W, et al. Oxidative Potential of Ambient PM2.5 in the Coastal Cities of the Bohai Sea, Northern China: Seasonal Variation and Source Apportionment. Environ Pollut. 2018;236:514-528. PubMed PMID: 29428706.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Oxidative potential of ambient PM2.5 in the coastal cities of the Bohai Sea, northern China: Seasonal variation and source apportionment. AU - Liu,WeiJian, AU - Xu,YunSong, AU - Liu,WenXin, AU - Liu,QingYang, AU - Yu,ShuangYu, AU - Liu,Yang, AU - Wang,Xin, AU - Tao,Shu, PY - 2017/09/19/received PY - 2018/01/05/revised PY - 2018/01/31/accepted PY - 2018/2/13/pubmed PY - 2018/6/19/medline PY - 2018/2/12/entrez KW - Coastal cities on the Bohai Sea KW - Oxidative potential KW - PM(2.5) KW - Seasonal variation KW - Source apportionment SP - 514 EP - 528 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ. Pollut. VL - 236 N2 - Emissions of air pollutants from primary and secondary sources in China are considerably higher than those in developed countries, and exposure to air pollution is main risk of public health. Identifying specific particulate matter (PM) compositions and sources are essential for policy makers to propose effective control measures for pollutant emissions. Ambient PM2.5 samples covered a whole year were collected from three coastal cities of the Bohai Sea. Oxidative potential (OP) was selected as the indicator to characterize associated PM compositions and sources most responsible for adverse impacts on human health. Positive matrix factorization (PMF) and multiple linear regression (MLR) were employed to estimate correlations of PM2.5 sources with OP. The volume- and mass-based dithiothreitol (DTTv and DTTm) activities of PM2.5 were significantly higher in local winter or autumn (p < 0.01). Spatial and seasonal variations in DTTv and DTTm were much larger than mass concentrations of PM2.5, indicated specific chemical components are responsible for PM2.5 derived OP. Strong correlations (r > 0.700, p < 0.01) were found between DTT activity and water-soluble organic carbon (WSOC) and some transition metals. Using PMF, source fractions of PM2.5 were resolved as secondary source, traffic source, biomass burning, sea spray and urban dust, industry, coal combustion, and mineral dust. Further quantified by MLR, coal combustion, biomass burning, secondary sources, industry, and traffic source were dominant contributors to the water-soluble DTTv activity. Our results also suggested large differences in seasonal contributions of different sources to DTTv variability. A higher contribution of DTTv was derived from coal combustion during the local heating period. Secondary sources exhibited a greater fraction of DTTv in summer, when there was stronger solar radiation. Traffic sources exhibited a prevailing contribution in summer, and industry contributed larger proportions in spring and winter. Future abatement priority of air pollution should reduce the sources contributing to OP of PM2.5. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/29428706/Oxidative_potential_of_ambient_PM2_5_in_the_coastal_cities_of_the_Bohai_Sea_northern_China:_Seasonal_variation_and_source_apportionment_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(17)33921-0 DB - PRIME DP - Unbound Medicine ER -