快速城市化地区土壤多环芳烃的空间分布及来源:以深圳市为例

doi:10.19741/j.issn.1673-4831.2018.0207

Abstract

Abstract:

Urbanization and its environmental impact are important topics in global environmental change. In this study, 93 urban soil samples from different land-use types in Shenzhen, China, were used to investigate the spatial and temporal analysis of PAHs content, components and sources in Shenzhen urban green space. High spatial resolution mapping was conducted to assess the environmental and health risks of PAHs in urban green spaces. The results show that the total PAHs contents in the surface soil of the main Shenzhen urban area were between 73.47-2 309.88 ng·g^-1, with an average of 494.34 ng·g^-1. The total content of seven carcinogenic PAHs was between 24.45 and 1 274.96 ng·g^-1, with an average of 257.35 ng·g^-1, accounting for 52.1% of the total PAHs. In the spatial distribution, the PAHs content was highest in industrially dense areas, followed by population and traffic-intensive areas, and the PAHs content was lowest in areas with a large proportion of green spaces. The PMF model show that coal-fired high-temperature combustion and traffic exhaust emissions were the main sources of surface PAHs in the main urban areas of Shenzhen. ILCRs and CR in different exposure approaches was less than 10^-6 for both children and adults, indicating that the soil environmental quality in Shenzhen was generally good, but the maximum carcinogenic risk for children and adults reached 10^-6 in some locations, which indicates potential health risks. The prevention and control of urban soil pollution needs to be taken seriously to ensure the coordinated development of urban economy and ecological environment.

Key words: PAHs, spatial analysis, sources, risk assessment, Shenzhen

CLC Number:

X53
X131.3

ZHAO Han, ZHAO Jun, XU Xiao-ye, WU Shao-hua, ZHU Qing. Spatial Distribution, Sources and Risk Assessment of Polycyclic Aromatic Hydrocarbons in a Rapid Urbanization City: Shenzhen[J]. Journal of Ecology and Rural Environment, 2019, 35(1): 38-45.

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Spatial Distribution, Sources and Risk Assessment of Polycyclic Aromatic Hydrocarbons in a Rapid Urbanization City: Shenzhen

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