Finally, changes in bioavailability may occur, with less bioavailable forms of contaminant being converted to more bioavailable forms.
The ability to detect and identify the physiochemical form of contaminants in the environment is important for degradation, fate and transport, and toxicity studies.
The chemical aspects include the level and chemical form of contaminants found within both the biotic and the abiotic components of ecosystem.
Existing closed-form solutions of contaminant transport problems are limited by the mathematically convenient assumption of uniform flow.
Risks to the polar bear include climate change, pollution in the form of toxic contaminants, conflicts with shipping, stresses from recreational polar-bear watching, and oil and gas exploration and development.
Some forms of naturally occurring contaminants may be tightly bound within the soil matrix and pass through the human body without being released and taken up by the body (UK EA 2009).
As well as affecting contaminant transport, climate change is also likely to affect fate processes that determine the persistence and form of a contaminant in an environmental compartment.
"The whole notion of adding an amendment to the soil to change the mineral form of a contaminant and make it safe is great," said Sally Brown, a research professor in ecology and environment at the University of Washington.
The significance of a particular pathway or process depends on the underlying properties (e.g., hydrophobicity, solubility, volatility) and form of the contaminant (particulate, particle associated, dissolved; Figure 1).
Considering the increasing interest in the use of ozonation and other forms of oxidation for chemical contaminant attenuation, more research is warranted to identify, biologically characterize, and attenuate the resulting products.
