Abstract
Fine particulate matter is associated with adverse health effects, but exactly which characteristics of PM2.5 are responsible for this is still widely debated. We evaluated seasonal dynamics of the composition and chemical characteristics of PM2.5 in Zhuhai, China. PM2.5 characteristics at five selected sites within Zhuhai city were analyzed. Sampling began on January 10, 2015, and was conducted for 1 year. The ambient mass concentration, carbon content (organic and elemental carbon, OC and EC), level of inorganic ions, and major chemical composition of PM2.5 were also determined. Average concentrations of PM2.5 were lower than the National Ambient Air Quality Standard (NAAQS) 24-h average of 65 μg/m3. The daily PM2.5 concentration in Zhuhai city exhibited clear seasonal dynamics, with higher daily PM2.5 concentrations in autumn and winter than in spring and summer. Carbon species (OC and EC) and water-soluble ions were the primary components of the PM2.5 fraction of particles. Apart from OC and EC, chemical species in PM2.5 were mainly composed of NH4+ and SO42−. There was a marked difference between the summer and winter periods: the concentrations of OC and EC in winter were roughly 3.4 and 4.0 times than those in summer, while NH4+, SO42−, NO3−, and Na+ were 3.2, 4.5, 28.0, and 5.7 times higher in winter than those in summer, respectively. The results of chemical analysis were consistent with three sources dominating PM2.5: coal combustion, biomass burning, and vehicle exhaust; road dust and construction; and from reaction of HCl and HNO3 with NH3 to form NH4Cl and NH4NO3. However, additional work is needed to improve the mass balance and to obtain the source profiles necessary to use these data for source apportionment.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (41701585, 41771027 and 41611140112); the Fundamental Research Fund for the Central Universities of China (17lgpy40); the Natural Science Foundation of Guangdong, China (2017A030310309); Provincial Special Fund for Economic Development (Marine Economic Development) (GDME-2018E004), and the Scientific and Technological Innovation Project of the Water Sciences Department of Guangdong Province (2018–2021). We also thank the anonymous reviewers for their excellent comments and efforts.
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Liang, Z., Zhao, X., Chen, J. et al. Seasonal characteristics of chemical compositions and sources identification of PM2.5 in Zhuhai, China. Environ Geochem Health 41, 715–728 (2019). https://doi.org/10.1007/s10653-018-0164-2
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DOI: https://doi.org/10.1007/s10653-018-0164-2