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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

Accepted Manuscripts
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 Science, 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 total PAHs. Mean concentration of PAHs among the four functional districts followed the order: education district > traffic area> business district > residential area. However, individual PAH concentrations presented weak correlation with total organic carbon. Based on the isomer ratios of PAH, biomass and coal combustion; and petroleum input were two key factors controlling PAH levels in this study. At 95% confidence interval, total incremental lifetime cancer risks for children, adolescence and adults approximated 10–6–1.5 × 10–5. These values were higher than the baseline value for acceptable risk (10–6), indicating potential carcinogenic risk.

Keywords

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


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