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Potential Application to PAH Cycling Among Trophic Levels Higher Trophic Organisms Plant C compounds Benthic Organisms Microbial lipids Modern C (high PMC) Petroleum products Carbon Cycling Dead C (low PMC) Labile and Refractory SOM fractions
Future Directions… • Can 14C PMC be used to assess PAH attenuation in relation to other weathering indices – Desorption isotherms, toxicity assays – Biological inventory data (indices for eco-restoration) • Use 14 C PMC and fractions to evaluate PAH C cycling from petrogenic and pyrogenic sources • Use 14C radiocarbon analyses and IRMS to evaluate PAH C cycling among trophic levels at field sites – Other petroleum-derived contaminants
Page 1 and 2: Tools to Assess Plant C and PAH C C
Page 3 and 4: Rhizosphere mechanisms that alter o
Page 5 and 6: Tools for OM Characterization • C
Page 7 and 8: Modern Plant Carbon and Petroleum C
Page 9 and 10: Fractionation Methods to Improve C
Page 11 and 12: Changes to OM Composition Character
Page 13 and 14: [PAH] relative to OM changes Plant
Page 15 and 16: Other Indices for PAH Attenuation
Page 17 and 18: PAH Attenuation Weathering Indices
Page 19 and 20: For Humic Fractionations… • Pla
Page 21 and 22: Density Fractionation of SOM Fracti
Page 23 and 24: OM Changes in Density Fractions Gas
Page 25 and 26: N0 N0 N0 BP BP BP ACL ACL ACL ACE A
Page 27 and 28: PAH Attenuation in Density Fraction
Page 29: For Density Fractions… • Plant-

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