Fate of Atmospherically Deposited Polycyclic Aromatic Hydrocarbons (PAHs) in Chesapeake Bay

摘要: Factors controlling polycyclic aromatic hydrocarbon (PAH) distributions in southern Chesapeake Bay surface sediments were investigated with samples collected seasonally from five sites. Principal components analysis (PCA) suggests unique sources (combustion vs petroleum) and partitioning differences (volatile particle reactive) among PAHs, but a common mode of entry for these contaminants to sediments. The fractional concentrations all PAHs sediments, the exception perylene, positively correlated their atmospheric dry deposition fluxes (Fdry) indicating that aerosol-bound watershed controls influx Overall, PAH well explained by multiple-regression model (r2 = 0.88, p 0.0001) Fdry sediment total organic carbon (TOC) content explaining most variance (57% 43%, respectively). However, many gas exchange across air-water interface is similar or greater magnitude even when scaled area. fate input was determined be uptake metabolism within aquatic food web rather than