SPATIAL AND TEMPORAL DISTRIBUTION OF POLYCYCLIC AROMATIC HYDROCARBONS (PAHS) WITHIN SEDIMENT AND FISH TISSUE OF THE LOWER CHESAPEAKE BAY BASIN, USA
The analysis employs accelerated solvent extraction and gas chromatography mass spectrometry (GCMS) with selected ion monitoring. Preliminary results show that PAH hot spots are also areas with multiple identified PAH sources, both point and atmospheric. Overall, surficial sediment PAH levels had a mean value of 3.9x103 ±2.5x104 ng/g, while fish tissue PAH levels had a mean value of 8.1 ±8.2 ng/g. This disparity may be due to the low efficiency of PAH bioconcentration. Fish tissue PAH levels were randomly distributed, while surficial sediments reveal high clusters. This may be due to fish mobility and migration. Additionally, apex predator species were shown to have PAH values greater than could be accounted for by direct exposure alone, as seen in bottom feeding fish. This reveals that bio-magnification is occurring.