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Polycyclic aromatic hydrocarbons in the dagang oilfield (china): distribution, sources, and risk assessment.

Jiao H, Rui X, Wu S, Bai Z, Zhuang X, Huang Z - Int J Environ Res Public Health (2015)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences and Technology, Changzhi University, Changzhi 046011, China. jiaohaihuaczxy@sina.com.

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.

No MeSH data available.


Changes of the means concentrations (µg·kg−1) of ∑PAH in the site soils along the different roads. Notes: (A): shows the means concentrations of ∑PAH for different sites along the different road; (B): shows the change of the mean concentrations of ∑PAH along a gradient with distance (D) from a road at D < 5m, 5m < D < 10m, 10m < D < 50m, and 50m < D < 200m, respectively.
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ijerph-12-05775-f005: Changes of the means concentrations (µg·kg−1) of ∑PAH in the site soils along the different roads. Notes: (A): shows the means concentrations of ∑PAH for different sites along the different road; (B): shows the change of the mean concentrations of ∑PAH along a gradient with distance (D) from a road at D < 5m, 5m < D < 10m, 10m < D < 50m, and 50m < D < 200m, respectively.

Mentions: Figure 5A shows that the distinction in the means concentrations of ∑PAH for different sites along the Maxi Road, Xingfu Road, Chuangxin Road, and Changye Road, respectively. Figure 5B reveals that the mean concentrations of ∑PAH appears to decrease along a gradient with distance (D) from a road at D < 5m, 5m < D < 10m, 10m < D < 50m, and 50m < D < 200m, respectively. Analysis of the variance trend of ∑PAHs indicates that ∑PAHs was significantly (p< 0.05) higher at D< 5 m than at D > 10m sampling sites, which can be ascribed to traffic activity. Many studies have reported that PAHs are primarily emitted to the atmosphere, and after transport over short and long distances in both gaseous and particulate forms, they accumulate in soils after dry and wet atmospheric deposition [25]. The result thus reflects the known relationship between PAH loadings and distance from emission sources.


Polycyclic aromatic hydrocarbons in the dagang oilfield (china): distribution, sources, and risk assessment.

Jiao H, Rui X, Wu S, Bai Z, Zhuang X, Huang Z - Int J Environ Res Public Health (2015)

Changes of the means concentrations (µg·kg−1) of ∑PAH in the site soils along the different roads. Notes: (A): shows the means concentrations of ∑PAH for different sites along the different road; (B): shows the change of the mean concentrations of ∑PAH along a gradient with distance (D) from a road at D < 5m, 5m < D < 10m, 10m < D < 50m, and 50m < D < 200m, respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4483671&req=5

ijerph-12-05775-f005: Changes of the means concentrations (µg·kg−1) of ∑PAH in the site soils along the different roads. Notes: (A): shows the means concentrations of ∑PAH for different sites along the different road; (B): shows the change of the mean concentrations of ∑PAH along a gradient with distance (D) from a road at D < 5m, 5m < D < 10m, 10m < D < 50m, and 50m < D < 200m, respectively.
Mentions: Figure 5A shows that the distinction in the means concentrations of ∑PAH for different sites along the Maxi Road, Xingfu Road, Chuangxin Road, and Changye Road, respectively. Figure 5B reveals that the mean concentrations of ∑PAH appears to decrease along a gradient with distance (D) from a road at D < 5m, 5m < D < 10m, 10m < D < 50m, and 50m < D < 200m, respectively. Analysis of the variance trend of ∑PAHs indicates that ∑PAHs was significantly (p< 0.05) higher at D< 5 m than at D > 10m sampling sites, which can be ascribed to traffic activity. Many studies have reported that PAHs are primarily emitted to the atmosphere, and after transport over short and long distances in both gaseous and particulate forms, they accumulate in soils after dry and wet atmospheric deposition [25]. The result thus reflects the known relationship between PAH loadings and distance from emission sources.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Biological Sciences and Technology, Changzhi University, Changzhi 046011, China. jiaohaihuaczxy@sina.com.

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.

No MeSH data available.