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Chemical characterization and source apportionment of ambient nanoparticles: a case study in Hanoi, Vietnam

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Abstract

PM0.1 has been believed to have adverse short- and long-term effects on human health. However, the information of PM0.1 that is needed to fully evaluate its influence on human health and environment is still scarce in many developing countries. This is a comprehensive study on the levels, chemical compositions, and source apportionment of PM0.1 conducted in Hanoi, Vietnam. Twenty-four-hour samples of PM0.1 were collected during the dry season (November to December 2015) at a mixed site to get the information on mass concentrations and chemical compositions. Multiple linear regression analysis was utilized to investigate the simultaneous influence of meteorological factors on fluctuations in the daily levels of PM0.1. Multiple linear regression models could explain about 50% of the variations of PM0.1 concentrations, in which wind speed is the most important variable. The average concentrations of organic carbon (OC), elemental carbon (EC), water-soluble ions (Ca2+, K+, Mg2+, Na+, NH4+, Cl, NO3, SO42−, C2O42−), and elements (Be, Al, V, Cr, Mn, Co, Ni, Cu, Zn, As, Se, Mo, Cd, Sb, Ba, Tl, Pb, Na, Fe, Mg, K, and Ca) were 2.77 ± 0.90 μg m−3, 0.63 ± 0.28 μg m−3, 0.88 ± 0.39 μg m−3, and 0.05 ± 0.02 μg m−3, accounting for 51.23 ± 9.32%, 11.22 ± 2.10%, 16.28 ± 2.67%, and 1.11 ± 0.94%, respectively. A positive matrix factorization model revealed the contributions of five major sources to the PM0.1 mass including traffic (gasoline and diesel emissions, 46.28%), secondary emissions (31.18%), resident/commerce (12.23%), industry (6.05%), and road/construction (2.92%).

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Acknowledgments

This research is funded by Vietnam National University Ho Chi Minh City (VNU-HCM) under grant number B2019-24-01/HĐ-KHCN. Kanazawa University, Japan, is acknowledged for providing the sampler (KU-TSC 26A57C1) for this study. The authors would like to thank Dr. Kathryn Zimmermann at Georgia Gwinnett College and Dr. Chris Reinhard at the Georgia Institute of Technology for the generous support in elemental analysis. The authors also would like to thank students of HUST for their help in the sampling.

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Correspondence to Trung-Dung Nghiem or Thi Thu Thuy Nguyen.

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Responsible Editor: Constantini Samara

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Highlights

• PM0.1 was collected in 2 months in Hanoi for speciation and source apportionment.

• The chemical compositions could be explained 83% mass concentration of PM0.1.

• Main sources are traffic, secondary, resident/commerce, industry, and road/construction.

• Traffic contributes 46.28% PM0.1 mass; secondary is the next important source.

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Nghiem, TD., Nguyen, T.T.T., Nguyen, T.T.H. et al. Chemical characterization and source apportionment of ambient nanoparticles: a case study in Hanoi, Vietnam. Environ Sci Pollut Res 27, 30661–30672 (2020). https://doi.org/10.1007/s11356-020-09417-5

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  • DOI: https://doi.org/10.1007/s11356-020-09417-5

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