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| Polycyclic aromatic hydrocarbons in urban green space of Beijing: distribution and potential risk |
| ZHANG Juan1, WU Jian-zhi2, LIU Yan1 |
1. Beijing Laboratory of Urban and Rural Ecological Environment, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, College of Landscape Architecture, Beijing Forestry University, Beijing 100083, China;
2. Beijing Institute of Landscape Architecture, Beijing 100102, China |
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Abstract To determine the concentration, spatial distribution, and health risk of 15polycyclic aromatic hydrocarbons (PAHs) in urban green space, a total of 64surface soil samples (0~5cm) were collected from park green space (PGS) and residential green space (RGS). No significant difference was found between two types of green space. The content of Σ15PAHs in PGS ranged from 1069 to 19002μg/kg, with a median value of 4377μg/kg; And the content of Σ15PAHs in RGS ranged from 947 to 16882μg/kg, with a median value of 4708μg/kg. Naphthalene, pyrene and Benzo (a) pyrene contribute a lot to the total concentration. Samples with higher PAHs levels mainly distributed in the central and Southwest of the city. The incremental lifetime cancer risks (ILCRs) associated with exposures to PAHs in soil was calculated for children and adults, respectively. Results showed that ILCRs were quite low for humen exposure to the current urban green space under normal conditions. But individual samples were seriously polluted and its potential health risks can not be ignored.
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Received: 31 May 2016
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