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Transferral of HMs pollution from road-deposited sediments to stormwater runoff during transport processes

  • Qian Wang
  • Qionghua Zhang
  • Mawuli Dzakpasu
  • Nini Chang
  • Xiaochang WangEmail author
Research Article
  • 4 Downloads

Abstract

Stormwater runoff, derived from the wash-off of road-deposited sediments (RDS), contains elevated heavy metal (HM) concentrations and, thus, imposes an increasing threat to urban aquatic ecosystems. In-depth understanding of the variations of HMs pollution from RDS to stormwater during transport processes facilitates the development of effective RDS and stormwater control strategies. Toward this end, the distribution of HMs (Cu, Pb, Zn, Cr, and Ni) in RDS and stormwater were investigated simultaneously. The results show a preferential accumulation of Pb and Zn in the finer (<38.5 μm) RDS, and Cu, Cr and Ni in the coarser (38.5–150 μm) RDS. For stormwater, n.d.~48.6% of HMs fractionated into the dissolved phase, and stormwater particles constitute the primary carriers of HMs. Furthermore, the accumulation of HMs in stormwater particles increased linearly with finer particle size distributions (PSD). Geoaccumulation index (Igeo) highlighted the predominant pollution of both RDS and stormwater particles by Cu, Pb and Zn. Nonetheless, Cu, Pb, and Ni mostly contributed the potential ecological risk of RDS, whereas Cu, Pb, and Zn mainly contributed that of stormwater particles. Moreover, contamination by Cu, Pb and Zn was significantly higher in stormwater particles than that in RDS. These differences are attributable to the solubility and size-dependent accumulation of HMs in RDS, as well as the PSD variations during transport processes. The study outcomes highlight the importance of very fine (nano- and submicron- scale) RDS in stormwater pollution and the necessity of control.

Keywords

Road-deposited sediment Stormwater runoff Heavy metal Particle size Pollution variation 

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 51508447), the National Program of Water Pollution Control in China (Grant No. 2014ZX07305-002), the National Key Technology Support Program (Grant No. 2014BAC13B06), and Program for Innovative Research Team in Shaanxi (PIRT) (Grant No. 2013KCT-13).

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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Qian Wang
    • 1
  • Qionghua Zhang
    • 1
    • 2
  • Mawuli Dzakpasu
    • 1
    • 2
  • Nini Chang
    • 1
  • Xiaochang Wang
    • 1
    • 2
    Email author
  1. 1.Key Laboratory of Northwest Water Resource, Environment and Ecology (Ministry of Education), School of Environmental and Municipal EngineeringXi’an University of Architecture and TechnologyXi’anChina
  2. 2.International Science & Technology Cooperation Center for Urban Alternative Water Resources DevelopmentXi’anChina

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