Vertical distribution and environmental significance of PAHs in soil profiles in Beijing, China.
Vertical distribution of both the concentration and composition of polycyclic aromatic hydrocarbons (PAHs) in ten profiles in Beijing has been investigated. The results showed that PAH concentrations and compositions in topsoil from different sampling sites were different. PAH concentrations were much higher in topsoil of the investigated urban area, industrial region, and paddy field with wastewater irrigation than in other areas. Moreover, PAH concentrations in topsoil were much higher than those at greater depth, where the concentrations were relatively consistent in most soil profiles. The fingerprints of PAHs in the samples from topsoil (0-30 cm) in the same profiles were similar and were obviously different from those at greater depth, suggesting that PAH sources were consistent in topsoil samples and were discriminating between topsoil and deeper soils. PAHs in topsoil mainly arose from mixed sources of combustion of liquid fuel, coal, and/or wood, as well as wastewater irrigation, while those at greater depth were derived from soil genesis and the process of soil formation.
Bu
Qing Wei
QW
School of Environment, Beijing Normal University, No. 19 Xinjiekouwai Street, Beijing, P.R. China.
Zhang
Zhi Huan
ZH
Lu
Song
S
He
Feng Peng
FP
D000383:Agriculture; D002681:China; D004784:Environmental Monitoring; D008401:Gas Chromatography-Mass Spectrometry; D005843:Geography; D007221:Industry; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000633:toxicity; D012989:Soil Pollutants / Q000032:analysis* / Q000633:toxicity; D014504:Urban Health; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity
D011084:Polycyclic Aromatic Hydrocarbons; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical