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Potential toxic trace element (PTE) contamination in Baoji urban soil (NW China): spatial distribution, mobility behavior, and health risk

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Abstract

Rapid urbanization and industrialization may cause increased exposure levels to potential toxic trace elements (PTEs) and associated health risks for population living in cities. The main objectives of this study are to investigate systematically the occurrence, source, fate, and risk of PTE contamination from industrial influence in Baoji urban soil. Seven PTE levels (Pb, Zn, Cu, Cr, V, Sb, and As) were surveyed in 50 composite samples from Baoji urban soil by wavelength dispersive X-ray fluorescence spectrometry. Results reveal that the long-term industrial activities have increased PTEs Pb (409.20 mg/kg mean value), Cu (107.19 mg/kg mean value), Zn (374.47 mg/kg mean value), and Sb (26.00 mg/kg mean value) to enrich in urban soil at the different extents. The same results concur with the significant similarity of spatial distribution patterns of Pb, Zn, Cu, and Sb (slightly similar distribution) interpolated by GIS, implying a considerable Pb, Zn, Cu, and Sb contamination pool in urban soil disturbance from local metallic industrial activities. Whereas As in study area mainly controls parent material leaching and therefore has natural sources. Cr and V with the heterogeneous spatial distributions are possibly inclined to coal combustion sources. Those conclusions are also confirmed by the results of multivariate analysis. The chemical forms of PTEs fractionated by BCR three-stage sequential extraction procedure show that Pb and Cu are highly associated to the reducible phase (62.55 and 36.41%, respectively). However, Zn is highly associated to the oxidizable phase (33.68%), and a significant concentration is associated to acid and water extractable fractionation of 15.93% for Zn and 34.40% for Pb. In contrast, As, Cr, V, and Sb are mainly bound to the residual phase (>65% for all elements) with low concentrations retained to water extractable fractionation. The health risk assessed by a new classification Modified Integrate Risk Assessment Code (MI-RAC) reveals that the Pb poses the extremely high risk for human health than others. The results of PTE leaching in organic acids (artificial chelating agent and LMMOAs) indicate that low pH and more carboxyl groups of organic acid can quickly increase the PTEs release from soil and induce more mobility. By comparison, DTPA and EDTA are the effective extractant for Pb and Sb. The leaching kinetics of most PTEs are best described with the Elovich equation model and which involve the ligand exchange (LE) and ligand-enhanced dissolution (LED) two major process. It is a conclusion that long-term metallic industrial activities would accelerate the PTE accumulations in Baoji urban soil and enhance their mobility in a local scale. The considerable mobility and extremely high risk of Pb in Baoji ecoenvironment should be paid more attentions, and the phytoremediation with organic acid leaching assistant could be used to reduce total metal content of multiPTE contaminants in Baoji soils. The research will give the scientific knowledge for controlling the pollution of PTEs in urban soil and can be used as guidance to control the soil pollution in similar cities worldwide.

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Acknowledgements

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (41471420), the Natural Science Foundation of Shaanxi Province (2015JM4124), and Fundamental Research Funds for the Central Universities (GK201701010, GK 200902024, and GK201402032).

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  1. Department of Environmental Science, College of Tourism and Environment, Shaanxi Normal University, No. 199 Chang’an South Street, Xi’an, 710062, Shaanxi, People’s Republic of China

    Xiaoping Li, Ting Wu, Xianyu Liu, Changlin Xu, Yanan Zhao & Dongying Liu

  2. SNNU-JSU International Joint Research Centre for Nanoenvironment Science and Health, Shaanxi Normal University, Xi’an, 710062, Shaanxi, People’s Republic of China

    Xiaoping Li, Ting Wu, Xianyu Liu, Changlin Xu, Yanan Zhao, Dongying Liu & Hongtao Yu

  3. Military Medical Training department, Urumqi Ethnic Cadre College, Urumqi, 831200, People’s Republic of China

    Hongxiang Bao

  4. Department of Chemistry and Biochemistry, Jackson State University, Jackson, MS, 39217, USA

    Hongtao Yu

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Li, X., Wu, T., Bao, H. et al. Potential toxic trace element (PTE) contamination in Baoji urban soil (NW China): spatial distribution, mobility behavior, and health risk. Environ Sci Pollut Res 24, 19749–19766 (2017). https://doi.org/10.1007/s11356-017-9526-z

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  • DOI: https://doi.org/10.1007/s11356-017-9526-z

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