Investigate Integrate Innovate Environmental Forensic Principals for Sources Allocation of Polycyclic Aromatic Hydrocarbons October 2008 Presented by: Gwen O’Sullivan, Erik Martin and Court D. Sandau Presentation Outline • PAHs (structure and physicochemical properties) • Sources and sinks (fate and behavior) • Analytical techniques (including QA/QC) • Conventional source identification techniques • Toxic equivalent fingerprinting • Case study Polycyclic Aromatic Hydrocarbons (PAHs) Organic compounds which include only carbon and hydrogen with a fused ring structure containing at least two benzene (six-sided) rings but may also contain additional fused rings that are not six-sided. PAHs Phenanthrene Anthracene 3-Ringed PAH Naphthalene 2 Methylnaphthalene 2-Ringed PAH Benzo(a)pyrene Pyrene Fluoranthene Benzo(e)pyrene 4-Ringed PAH 5-Ringed PAH Indeno(1,2,3-cd)pyrene Benzo(ghi)perylene 6-Ringed PAH Classification Governed by thermodynamic properties – Biogenic (transformation of natural precursors) – Petrogenic (fossil fuels) – Pyrogenic (burning of organic materials) Sources and Sinks Sources & Sinks Fate and Behavior • Molecular weight, Gas • Aqueous solubility, K K • K – Henry’s H constant, • Octanol-water Liquid Solid partition coefficients [Kow] K • Gas / soil partition coefficient Analytical / Data Quality There are many variations of methods