Polycyclic Aromatic Hydrocarbons in the Dagang Oilfield (China): Distribution, Sources, and Risk Assessment

Haihua Jiao, Xiaoping Rui, Shanghua Wu, Zhihui Bai, Xuliang Zhuang and Zhanbin Huang
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Haihua Jiao: These authors contributed equally to this work.
Xiaoping Rui: These authors contributed equally to this work.
Shanghua Wu: These authors contributed equally to this work.
Zhihui Bai: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Xuliang Zhuang: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Zhanbin Huang: School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

IJERPH, 2015, vol. 12, issue 6, 1-17

Abstract: The levels of 16 polycyclic aromatic hydrocarbons (PAHs) were investigated in 27 upper layer (0–25 cm) soil samples collected from the Dagang Oilfield (China) in April 2013 to estimate their distribution, possible sources, and potential risks posed. The total concentrations of PAHs (?PAHs) varied between 103.6 µg·kg ?1 and 5872 µg·kg ?1 , with a mean concentration of 919.8 µg·kg ?1 ; increased concentrations were noted along a gradient from arable desert soil (mean 343.5 µg·kg ?1 ), to oil well areas (mean of 627.3 µg·kg ?1 ), to urban and residential zones (mean of 1856 µg·kg ?1 ). Diagnostic ratios showed diverse source of PAHs, including petroleum, liquid fossil fuels, and biomass combustion sources. Combustion sources were most significant for PAHs in arable desert soils and residential zones, while petroleum sources were a significant source of PAHs in oilfield areas. Based ontheir carcinogenity, PAHs were classified as carcinogenic (B) or not classified/non-carcinogenic (NB). The total concentrations of carcinogenic PAHs (?BPAHs) varied from 13.3 µg·kg ?1 to 4397 µg·kg ?1 across all samples, with a mean concentration of 594.4 µg·kg ?1 . The results suggest that oilfield soil is subject to a certain level of ecological environment risk.

Keywords: polycyclic aromatic hydrocarbons (PAHs); oilfield; soil contaminant; risk assessment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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