Polycyclic aromatic hydrocarbon concentrations in urban soils representing different land use categories in Shanghai |
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| Authors: | Jing Liang Guangjun Ma Hailan Fang Ling Chen Peter Christie |
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| Institution: | (1) Shanghai Institute of Landscape Gardening, Shanghai, 200232, China;(2) College of Resources and Environment Sciences, Nanjing Agricultural University, Nanjing, 210095, China;(3) State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China;(4) Agri-Environment Branch, Agri-Food and Biosciences Institute, Belfast, BT9 5PX, UK; |
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| Abstract: | An extensive soil survey was carried out in Shanghai to investigate the spatial distribution and possible sources of polycyclic
aromatic hydrocarbons (PAHs) in urban soils. Soil samples were collected from highways, iron-smelting plants, steel-smelting
plants, shipbuilding yards, coking plants, power plants, chemical plants, urban parks, university campuses and residential
areas and were analyzed for 16 PAHs by gas chromatography with mass detection. High PAH concentrations were found in all locations
investigated, with mean values of soil total PAH concentrations in the range 3,279–38,868 μg/kg DM, and the PAH concentrations
were significantly influenced by soil organic matter content. Soil PAH profiles in all districts were dominated by PAHs with
4–6 rings. Principal components analysis and diagnostic ratios of PAHs indicate that they were mainly derived from coal combustion
and petroleum but in soils from highways the PAHs were derived largely from vehicle exhaust emissions. The high concentrations
of PAHs found indicate that many urban soils in Shanghai represent a potential hazard to public health. |
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