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Polycyclic aromatic hydrocarbons (PAHs) in particle-size fractions of urban topsoils

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Abstract

Polycyclic aromatic hydrocarbons’ (PAHs) concentrations in bulk samples are commonly used to assess contamination but PAHs are unevenly distributed among particle-size fractions. Seventeen urban surface soil samples from the city of Xuzhou, China, were collected and then fractionated into five size fractions (2,000–300, 300–150, 150–75, 75–28, and <28 μm). The concentrations of 12 US EPA PAHs were measured using gas chromatograph/mass spectrometry in various fractions, and the bulk soil samples and distribution patterns of PAHs in different particle-size fractions were investigated. The mean concentration of total PAHs in bulk soil samples was 1,879 ng/g. The median concentrations for all individual PAH were higher for the 75–2,000 μm fraction than for the <75 μm fraction. The distribution factors for various PAHs in <28 μm soil fraction were closely correlated (r = −0.661, p < 0.019) to bulk soil fugacity capacity. The values of PAH isomer indicated that traffic emissions might be the major origin of PAHs in Xuzhou surface soils. Spearman correlation analysis was performed and the result suggested that soil organic carbon might be a factor controlling the concentrations of PAHs in soils.

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Acknowledgments

The authors acknowledge the work of an anonymous reviewer whose comments and suggestions greatly improved the quality of this manuscript. The material is based upon work supported by the National Natural Science Foundation of China (20977040).

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Correspondence to Xue Song Wang.

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Wang, X.S. Polycyclic aromatic hydrocarbons (PAHs) in particle-size fractions of urban topsoils. Environ Earth Sci 70, 2855–2864 (2013). https://doi.org/10.1007/s12665-013-2346-7

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