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(P172) Impact of episodic stormwater events on the bioavailability of polycyclic aromatic hydrocarbos (PAHs) in the Portland Harbor, Oregon.
Visalli, Solyssa*,1,2,4, Johnson, Eugene2,4, Loper, Bobby2,4, Anderson, Kim2,3,4, 1 Bioresouce Research, Corvallis, OR, USA2 Department of Environmental and Molecular Toxicology, Corvallis, OR4 Oregon State University, Corvallis, OR3 Food Safety and Environmental Stewardship, Corvallis, OR, USA
ABSTRACT- Passive sampling devices (PSDs) are employed to sample the dissolved, bioavailable fraction of polycyclic aromatic hydrocarbons (PAHs) from 10 sites in the Portland Harbor, Oregon. PAHs are a byproduct of the pyrolosis or combustion of organic materials; thus, they are widely dispersed in urban regions because of the variety of inputs including automobiles, industrial processes and fires. The objective of the project is to investigate the effects of infrequent storm events and river seasonality on the bioavailability of PAHs for biological uptake through membrane transfer by river organisms, particularly fish. The study location is an 18-mile stretch on the Willamette River in an urban / industrial area (from river mile 1-18.5), including a six-mile region designated as a Superfund site by the USEPA in Dec. 2000. Samplers are deployed within the main river channel, at specific distances from the river bottom, and located near stream outlets of various upstream land uses. This is to determine if variable PAH distributions can be correlated to different land activities in this region. The PAHs are analyzed by HPLC analyses with diode array and fluorescence detection. Sampling began in July 2001 and will continue through the end of 2002. Preliminary data indicates low concentrations of PAHs through the downtown Portland region with a marked increase at river mile 7. This potential point source falls within the designated Superfund site and is known to have had historic and current activities that likely produce PAHs.
Key words: passive sampling devices (PSDs), polycyclic aromatic hydrocarbons (PAHs), Portland Harbor, Willamette River
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