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Polycyclic Aromatic Hydrocarbons (PAHs) in Urban Street Dust of Huanggang, Central China: Status, Sources and Human Health Risk Assessment

Category: Aerosol and Atmospheric Chemistry

Article In Press
DOI: 10.4209/aaqr.2018.02.0048
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Jia Liu1, Jiaquan Zhang 2, Changlin Zhan2, Hongxia Liu2, Li Zhang2, Tianpeng Hu3, Xinli Xing3, Chengkai Qu4

  • 1 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2 School of Environmental Science and Engineering, Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China
  • 3 State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
  • 4 College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China

Highlights

Levels of ∑16PAHs in street dust ranged from 622.97–4340.67 µg kg–1.
Biomass and coal combustion were the main PAH emission sources.
ILCRs were > 10–6 and potential carcinogenic risk should be given attention.


Abstract

Twenty-one street dust samples were collected in Huanggang City, Hubei Province, Central China. Sixteen priority polycyclic aromatic hydrocarbons (PAHs) were determined by gas chromatography–mass spectrometry (GC-MS). Concentrations of ∑16PAHs ranged from 622.97 µg kg–1 to 4340.67 µg kg–1 with an average of 1862.10 µg kg–1. Among these PAHs, high-molecular-weight PAHs (four to six rings), which are the predominant PAH contributors in street dust, accounted for 55%–73% of the total PAHs. Mean concentrations of the PAHs among the four functional districts followed the order: education district > traffic area > business district > residential area. However, the individual PAH concentrations exhibited weak correlations with the total organic carbon. Based on the isomer ratios of the PAHs, biomass and coal combustion, and petroleum input were two key factors controlling PAH levels in this study. At a 95% confidence interval, the total incremental lifetime cancer risks for children, adolescents and adults approximated 10–6–1.5 × 10–5. These values were higher than the baseline value for acceptable risk (10–6), indicating a potential carcinogenic risk.

Keywords

Polycyclic aromatic hydrocarbons (PAHs) Street dust Source analysis Health risk assessment


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