Contaminant Availability
- Metals availability
- Some success with AVS/SEM ratio
- > 1 indicates several important metals fixed in sulfide form and unavailable
- < 1 not a clear indicator
- Full description requires sophisticated metal speciation dynamics
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- Hydrophobic organic availability
- Significant limitations shown for PAHs in soils (e.g. Martin Alexander)
- Significant sequestration in sediments containing soots
- Biphasic desorption rates and equilibrium commonly observed
- Linear, reversible compartment
- Nonlinear, desorption resistant compartment (Langmuir in shape)
- Biological Availability?