Long-term spatial and temporal patterns of polycyclic aromatic hydrocarbons (PAHs) in Scottish soils over 20 years, 1990-2009: a national picture.
Cui, Song; Zhang, Zulin; Fu, Qiang; Hough, Rupert; Yates, Kyari; Osprey, Mark; Yakowa, Godiya; Coull, Malcolm
Long-term spatial and temporal concentrations of polycyclic aromatic hydrocarbons (PAHs) in Scottish soils from four transects were measured in three national-scale surveys, conducted between 1990 and 2009. Measured concentrations of sixteen priority PAHs ranged from 15,690 to 83.7 ng/g-1, with an average of 3,659 plus or minus 3,131, to 727 plus or minus 654 ng/g-1. Of these, the high molecular weight (HMW) PAHs (i.e. four to six rings) accounted for 73.9% to 89.6%. Overall, concentrations of PAHs in the soil have decreased over time, but the proportion of carcinogenic sigmaPAH7 has increased. Concentrations of total PAHs correlated significantly with latitude (R = -0.345, p = 0.001). A significant correlation was found between concentrations of PAHs and soil organic carbon (SOC, R = 0.439, p = 0.000), which is an important factor influencing the levels of PAHs in soils. Source apportionment analysis indicated that the emission sources of PAHs have evolved from coal and biomass combustion to more diverse sources during the two decades covered by the surveys. It is likely that this reflects societal development towards a lower carbon economy and less use of biomass burning for domestic space heating.
|Journal Article Type||Article|
|Publication Date||Mar 1, 2020|
|Peer Reviewed||Peer Reviewed|
|Institution Citation||CUI, S., ZHANG, Z., FU, Q., HOUGH, R., YATES, K., OSPREY, M., YAKOWA, G. and COULL, M. 2020. Long-term spatial and temporal patterns of polycyclic aromatic hydrocarbons (PAHs) in Scottish soils over 20 years, 1990-2009: a national picture. Geoderma [online], 361, article ID 114135. Available from: https://doi.org/10.1016/j.geoderma.2019.114135|
|Keywords||Soil analysis; Soil toxicity; Polycyclic aromatic hydrocarbons; Hydrocarbons; Scotland|
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