167-5 Polycyclic Aromatic Hydrocarbons in Soil of the Canadian River Floodplain in Oklahoma.

See more from this Division: A05 Environmental Quality
See more from this Session: Trace Elements and Emerging Contaminants in the Environment: I
Tuesday, November 2, 2010: 3:00 PM
Hyatt Regency Long Beach, Seaview Ballroom B, First Floor
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Fabio Sartori1, Terry L. Wade2, Jose L. Sericano2, Binayak Mohanty3 and Kevin A. Smith4, (1)Texas A&M University, College Station, TX
(2)Geochemical and Environmental Research Group, Texas A&M University, College Station, TX
(3)Biological and Agricultural Engineering, Texas A&M University, College Station, TX
(4)USGS Oklahoma Water Science Center, U.S. Geological Survey, Oklahoma City, OK

The accumulation of polycyclic aromatic hydrocarbons (PAH) in soil, plants, and water may impart negative effects on ecosystem and human health. We quantified the concentration and distribution of 41 PAH (n = 32), organic C, total N, and S (n = 140) and investigated PAH sources, using a chronosequence of floodplain soils under a natural vegetation succession. Soil samples were collected between 0260 cm depth in bare land (the control), wetland, forest, and grassland areas near a closed municipal landfill and an active asphalt plant (the contaminant sources), in the north bank of the Canadian River near Norman, Oklahoma. Principal component, cluster, and correlation analysis were used to investigate the spatial distribution of PAH, in combination with diagnostic ratios to distinguish pyrogenic vs. petrogenic PAH suites. Total PAH concentration (∑PAH) had a mean of 1300 ng/g, minimum of 16 ng/g, and maximum of 12,000 ng/g. At 020 cm depth, ∑PAH was 3500 1600 ng/g (mean 1 SE) near the contaminant sources. The most common compounds were non-alkylated, high molecular weight PAH of pyrogenic origin, i.e. fluoranthene (17 %), pyrene (14 %), phenanthrene (9 %), benzo(b)fluoranthene (7 %), chrysene (6 %), and benzo(a)anthracene (5 %). ∑PAH in the control (130 23 ng/g) was comparable to reported concentrations for the rural Great Plains. Perylene had a unique distribution pattern suggesting biological inputs. The main PAH contamination mechanisms were likely atmospheric deposition due to asphalt production for 020 cm depth and past landfill operations at deeper depths.

See more from this Division: A05 Environmental Quality
See more from this Session: Trace Elements and Emerging Contaminants in the Environment: I