Practical and provocative, Bioavailability reviews prevalent understanding of the physical-chemical-biological mechanisms that control the bioavailability of both organic and inorganic contaminants in aquatic environments.Discusses the complex issues that surround many regulatory issuesEmphasizes the need to identify and control that portion of the total concentration that is biologically available and can cause adverse effects, i.e., "active"Examines the influence of dynamic factors, such as pH, alkalinity, and light on these mechanismsAddresses the subject of speciation for both organic and inorganic contaminants