Contaminant Availability

P Metals availability

<Some success with AVS/SEM ratio

B > 1 indicates several important metals fixed in sulfide form and unavailable

B < 1 not a clear indicator

B Problems with measurement and use noted by Windom and Saunders, HSRC/S&SW

<Full description requires sophisticated metal speciation dynamics

B Mercury one of the most important and most complicated species

P Hydrophobic organic availability

<Significant limitations shown for PAHs in soils (e.g. Martin Alexander)

<Reduced bioavailability in sediments containing soots

B Richard Luthy, Stanford

B David Kosson, Rutgers

<Models developed by

B Walt Weber, Univ of Michigan

B Joe Pignatello, Connecticut Agricultural Experiment Station

B Mason Tomson and Amy Kan, Rice University