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Revitt, D. Mike; Balogh, Tamas; Jones, Huw (2014)
Publisher: Springer
Languages: English
Types: Article
Polyaromatic hydrocarbons (PAHs) are emitted from a variety of sources and can accumulate on and within surface soil layers. To investigate the level of potential risk posed by surface contaminated soils, vertical soil column experiments were conducted to assess the mobility, when leached with simulated rainwater, of six selected PAHs (naphthalene, phenanthrene, fluoranthene, pyrene, benzo(e)pyrene and benzo(ghi)perylene) with contrasting hydrophobic characteristics and molecular weights/sizes. The only PAH found in the leachate within the experimental period of 26 days was naphthalene. The lack of migration of the other applied PAHs were consistent with their low mobilities within the soil columns which generally parallelled their log Koc values. Thus only 2.3% of fluoranthene, 1.8% of pyrene, 0.2% of benzo(e)pyrene and 0.4% of benzo(ghi)perylene were translocated below the surface layer. The PAH distributions in the soil columns followed decreasing power relationships with 90% reductions in the starting levels being shown to occur within a maximum average depth of 0.94 cm compared to an average starting depth of 0.5 cm. A simple predictive model identifies the extensive time periods, in excess of 10 years, required to mobilise 50% of the benzo(e)pyrene and benzo(ghi)perylene from the surface soil layer. Although this reduces to between 2 and 7 years for fluoranthene and pyrene, it is concluded that the possibility of surface applied PAHs reaching and contaminating a groundwater aquifer is unlikely.
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    • 115.6 113.6 112.4 59.9 39.0 72.7 1049.4 989.2 944.6 976.5 905.7 1100.4 6.1 1.7 6.1 5.8 0.3 2.5 5.25 4.95 4.72 4.88 4.53 5.50 Monuron 1050.1 3.9 5.25 RSD%: relative standard deviation of duplicate analyses 6.21(±0.07) 5.83(±0.11) 6.05(±0.03) 2.15(±0.18) 3.41(±0.32) 42.6 125.5 123.5 124.0 61.3 39.0 65.0 1-2 cm 2-3 cm 5-7 cm 7- cm 3-5 cm Online Resource 2. Distributions of phenanthrene at depths greater than 1 cm in soil columns A and B after leaching with 0.01M CaCl2 for 26 days.
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